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OBM Geriatrics

(ISSN 2638-1311)

OBM Geriatrics is an Open Access journal published quarterly online by LIDSEN Publishing Inc. The journal takes the premise that innovative approaches – including gene therapy, cell therapy, and epigenetic modulation – will result in clinical interventions that alter the fundamental pathology and the clinical course of age-related human diseases. We will give strong preference to papers that emphasize an alteration (or a potential alteration) in the fundamental disease course of Alzheimer’s disease, vascular aging diseases, osteoarthritis, osteoporosis, skin aging, immune senescence, and other age-related diseases.

Geriatric medicine is now entering a unique point in history, where the focus will no longer be on palliative, ameliorative, or social aspects of care for age-related disease, but will be capable of stopping, preventing, and reversing major disease constellations that have heretofore been entirely resistant to interventions based on “small molecular” pharmacological approaches. With the changing emphasis from genetic to epigenetic understandings of pathology (including telomere biology), with the use of gene delivery systems (including viral delivery systems), and with the use of cell-based therapies (including stem cell therapies), a fatalistic view of age-related disease is no longer a reasonable clinical default nor an appropriate clinical research paradigm.

Precedence will be given to papers describing fundamental interventions, including interventions that affect cell senescence, patterns of gene expression, telomere biology, stem cell biology, and other innovative, 21st century interventions, especially if the focus is on clinical applications, ongoing clinical trials, or animal trials preparatory to phase 1 human clinical trials.

Papers must be clear and concise, but detailed data is strongly encouraged. The journal publishes a variety of article types (Original Research, Review, Communication, Opinion, Comment, Conference Report, Technical Note, Book Review, etc.). There is no restriction on the length of the papers and we encourage scientists to publish their results in as much detail as possible.

Publication Speed (median values for papers published in 2023): Submission to First Decision: 5.7 weeks; Submission to Acceptance: 17.9 weeks; Acceptance to Publication: 7 days (1-2 days of FREE language polishing included)

Current Issue: 2024  Archive: 2023 2022 2021 2020 2019 2018 2017
Open Access Review

Emerging Roles of Signal Transduction Pathways in Neurodegenerative Diseases. Hunting New Possible Therapeutic Molecular Targets

Vincenza Rita Lo Vasco *

Department of Biomedical, Metabolic and Neural Sciences-Human Morphology Section, University of Modena and Reggio Emilia, Istituti Anatomici, Ed. M30, Policlinico Universitario di Modena, Largo del Pozzo, 71-41121, Modena, Italy

* Correspondence: Vincenza Rita Lo Vasco

Academic Editor: P. Hemachandra Reddy

Special Issue: Research in Neurodegenerative Diseases II

Received: January 27, 2023 | Accepted: April 26, 2023 | Published: May 05, 2023

OBM Geriatrics 2023, Volume 7, Issue 2, doi:10.21926/obm.geriatr.2302234

Recommended citation: Lo Vasco VR. Emerging Roles of Signal Transduction Pathways in Neurodegenerative Diseases. Hunting New Possible Therapeutic Molecular Targets. OBM Geriatrics 2023; 7(2): 234; doi:10.21926/obm.geriatr.2302234.

© 2023 by the authors. This is an open access article distributed under the conditions of the Creative Commons by Attribution License, which permits unrestricted use, distribution, and reproduction in any medium or format, provided the original work is correctly cited.

Abstract

Illnesses following the degeneration of the nervous system can occur due to aging or genetic mutations and represent a clinical concern. In neurodegenerative diseases, loss of neuronal structure and functions mainly causes cognitive impairment, representing an increasing social burden. In neurodegenerative diseases, the progressive loss of vulnerable populations of neurons in specific regions of the central nervous system was traced to different pathological events, such as misfolded proteins’ accumulation, abnormalities in proteasomes or phagosomes, as well as anomalies in lysosomes or mitochondria. Many research efforts identified important events involved in neurodegeneration, but the complex pathogenesis of neurodegenerative diseases is far from being fully elucidated. More recently, insights into the signal transduction pathways acting in the nervous system contributed to unveiling some molecular mechanisms triggering neurodegeneration. Abnormalities in the intra- or inter-cellular signaling were described to be involved in the pathogenesis of neurodegenerative disease. Understanding the signal transduction pathways that impact the nervous system homeostasis can offer a wide panel of potential targets for modulating therapeutic approaches. The present review will discuss the main signal transduction pathways involved in neurodegenerative disorders.

Graphical abstract

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Keywords

Neurodegenerative diseases; signal transduction pathways; TGF β; WnT; Sirtuins; Nerf2; STING; MAPK; PI3K; cell cycle

1. Introduction

Neurodegenerative diseases (NDs) comprise different pathologies, which cause mortality and morbidity worldwide, especially in the elderly. NDs are heterogeneous in clinical manifestations, etiology and pathogenesis, but they may bear overlapping features, mainly neurodegeneration. In neurodegeneration, the number of neurons progressively and massively decreases, and neurons lose their peculiar structure and function [1], resulting in synapse dysfunction, abnormalities in the neural network, and deposition of abnormal variant proteins in the brain [2,3,4,5]. In many NDs, abnormal accumulation of misfolded peptides or proteins occurs in the central nervous system (CNS). These insoluble deposits accumulate with time, and especially affect aged neurons. The accumulation of abnormal protein deposits, including Aβ1–42 peptide, hyperphosphorylated Tau protein or α-synuclein, affects the complex neuronal and glial intracellular signal transduction pathways [1,2,3,4]. That results in abnormalities of the mitochondrial and lysosomal regulation, and of the stress response, as well as in autophagy, neuroinflammation, synaptic toxicity, or maladaptive innate immune response [3,4]. However, the final cause of neuronal death is still unknown, and many risk factors were implicated. Although it is widely accepted that NDs are multifactorial diseases, dysregulation of selected signal transduction pathways and/or the cascade dysregulation of several interconnecting signaling pathways are emerging as common features of different NDs, offering new possible therapeutic targets. Several research reports suggested that NDs are multifactorial diseases. Over the years, several causes of etiology and/or events in the progression of the pathogenesis have been gradually attributed to NDs, including the hypothesis of the amyloid cascade, the role of Tau and neurofibrillary tangles (NFT), protein misfolding, predisposing genetic mutations, impaired neurotransmission and neurotrophic, neurotoxicity, neuroinflammation, mitochondria and endoplasmic reticulum dysfunctions, oxidative stress, proteasome or lysosome dysfunction and related autophagy, insulin and lipid metabolism abnormalities and related leptin neuroprotective effect, the role of the blood brain barrier (BBB), the involvement of the gut microbiota [6]. Interestingly, these factors often overlap and require several signal transduction pathways to be involved in all these events. The same is true for all these signal transduction pathways: overlap and interconnections can be identified and a large network of pathways is progressively recruited from the onset and during disease progression.

Aging is considered the main risk factor for developing ND. The worldwide incidence of NDs is progressively and inexorably increasing. Recent findings suggested that genetic predisposition and environmental factors contribute equally to increased risk of developing NDs. Moreover, in genetically predisposed people, the timing and extent of neurodegeneration depend on the environment [7,8,9]. Although different NDs share commonly identified disease mechanisms, including abnormal protein aggregation and clearance, axonal degeneration, and altered immune response, no curative therapies have been developed. Most NDs usually progress without remission.

The diagnosis of ND is often difficult, especially when early symptoms occur. Moreover, the management of ND represents an increasing social and economic burden [10,11], the personalized prognosis may be uncertain, and treatment is not effective [12]. Depending on the loss of specific neurons, NDs are featured by the progressive impairment of cognitive function, defective motor coordination, and increased pain sensitivity [13]. An ND can often be life-threatening, depending on the type and stage of the disease. Multiple aspects of daily activities and behavior can be affected, and basic tasks, such as speech, movement, stability, and balance are impaired. Also complicated tasks, such as cognitive abilities or bladder and bowel functions can be dramatically affected [1].

Most pharmacological treatments currently approved for managing NDs act upon the associated symptoms. The presence of the blood-brain barrier (BBB) affects the therapeutic approach. The BBB represents an efficient barrier protecting the brain from about 99% of foreign substances and towards selected putative successful management of ND [14]. Although successful treatment approaches with surgery and highly evasive techniques have limited clinical acceptance due to possible concerns about their long-term benefits for potential brain damage [14].

NDs such as Alzheimer’s disease (AD), Parkinson’s disease (PD) and dementia have increasingly become a clinical concern in older people [15,16].

2. The Signal Transduction in Neurodegenerative Diseases

The neural stem cells (NSC) produce the majority of neurons during childhood, while the number of neurons progressively decreases in adulthood [17]. Neurodegeneration characterizes different illnesses, including AD, PD, prion disease, amyotrophic lateral sclerosis (ALS), motor neuron disease (MND), Huntington’s disease, spinal muscular atrophies (SMA), and spinocerebellar ataxia (SCA) [18,19,20,21,22]. Several different pathologies may underline a single ND [23,24,25,26].

Although the hallmarks of some NDs, such as AD and PD, have been partially identified, the underlying mechanisms of disease development are far from fully elucidated. Several stimuli were demonstrated to trigger neurodegeneration, such as cell cycle activation, altered oxidative stress, and inflammation [27,28,29,30]. Specific genetic mutations have been identified in a few cases of familial AD and PD, as well as in genetically determined NDs, such as Huntington’s disease, SCA and SMA [31,32,33,34,35,36].

Many research efforts identified important events involved in neurodegeneration, but the complex pathogenesis of NDs is far from being fully elucidated. Recently, a growing body of evidence has drawn attention to the response of neurons to control signal transducers, which may be abnormal due to molecular alterations in specific proteins/genes associated with signaling pathways. Signaling molecules are connected and form an intricate network, so alterations following abnormal protein production can disrupt the cascade of interactions in one or more pathways. Molecules belonging to the signaling pathways acting in neurons seem to play crucial functions in the appearance of features of NDs. Identifying or defining intra or inter-cellular signal transduction pathways are crucial to understand almost all biological processes, including cell growth, differentiation and migration, tissue organization, immune response, cancer initiation and development. Recent technological advancements improved the study of signal transduction in measuring and manipulating signal transduction molecules, and in single-cell resolution modeling. Analyses of the crosstalk between the signaling molecules might lead to identifying molecular therapeutic targets, paving the way to promising new therapy approaches also for NDs.

The present review aims to provide a partial list of the main signaling pathways that could underlie NDs and briefly touch on the state of the art of their involvement and interconnections, in both in vitro and in vivo experimental models, as well as in affected patients. Some signal transduction pathways, the possible involvement in features of NDs, relationship with aging and misfolded proteins will be discussed, including TLRs, TGF β and neuroinflammation; Sirtuins, Nrf2, p53 and oxidative stress; STING–TBK1–IRF axis, PI3K/AKT/mTOR axis and autophagy; MAPK, Wnt, Notch and nervous development; the cell cycle pathway, Myc, Hippo pathway, Rho and cell cycle regulation.

3. TLRs

Toll-like receptors (TLRs) represent the converging point of the innate and adaptive immune system, and act as the immunity compartment in the nervous system, which can provide an immune response, unlike the absolute immunological privilege of the brain, as long since [37]. TLRs are expressed in neurons and macrophages resident in the nervous tissue [37]. In the CNS of both mice and humans, neurons and microglia express similarly the TLRs, but the expression differs in astrocytes, and oligodendrocytes [38,39]. In the peripheral nervous system of both mice and humans, neurons and resident macrophages similarly express the TLRs. However, the expression differs in Schwann cells, which produce myelin as the oligodendrocytes [40].

TLRs can be activated in the absence of microbial infection [41] and contribute to the regulation of neurogenesis [42]. The transcription of TLR-codifying genes changes with aging [43]. Although not be completely reliable in the case of TLRs, the experimental models offered some interesting insights. Studies in murine models of AD, PD, ALS, Pick’s disease, and olivopontocerebellar atrophy suggested the possible involvement of the TLR pathway, demonstrating high expression levels or upregulation of selected TLRs [43,44].

In AD, glial activation of the innate immune response is an important event, and inflammatory response is concentrated around the sites of Aβ plaques deposition, where increased levels of pro-inflammatory cytokines, complement components and proteases are delivered probably by the activated astrocytes and microglia surrounding the plaque [44,45]. Long-term treatment with non-steroidal anti-inflammatory drugs seems to reduce AD risk and to delay the clinical progression. Accordingly, in AD brains, the expression of TLRs is upregulated, both in experimental murine models and in AD patients [43,46]. Moreover, activated glia expressing high TLR4 and TLR2 were observed to surround Aβ plaques [46].

In APP transgenic mice overexpressing the amyloid precursor protein (APP), a significant increase in the transcription of TLR4 was described [46]. Treatment of APP mice for 12 weeks with the inflammatory stimulus (lipopolysaccharide-LPS, which binds TLR4) induced high numbers of activated microglia and astrocytes in the neocortex and hippocampus and accumulation of aggregated amyloid-β (Aβ) in neurons neighboring the activated microglia [47]. Promising studies suggested that neurons expressing TLR4 are very sensitive to Aβ accumulation in AD [47].

Other reports suggested that activation of TLR4 and/or TLR 9 might be required for clearance of Aβ in AD [48,49,50,51,52,53]. It seems that Aβ can activate TLRs and mediate the activation of the microglia to produce nitric oxide and TNF-α [54]. Accordingly, in mice bearing a mutation in TLR4, the stimulation of microglia and related production of cytokines by Aβ decreased, suggesting a functional role of TLR4 [46,55].

The mechanism leading the TLR activation to determine Aβ clearance is not elucidated, nor is it clear whether Aβ-induced TLR activation promotes or inhibits AD progression. Clarifying this controversial point would be extremely useful, as the TLR signaling pathways represent a promising therapeutic target.

4. TGF β

The transforming growth factor β (TGF β) superfamily comprises of growth factors (GFs) including TGF β, activins, and bone morphogenetic proteins (BMPs). The complex TGF β pathway is involved in the regulation of pleiotropic physiological functions in cells [56]. In the early stages of cancer, TGF β induces apoptosis and cell-cycle arrest, acting de facto as a tumor suppressor. By contrast, in advanced stages of cancer, TGF β acts as a tumor promoter [57,58,59].

In the nervous tissue, the TGF β superfamily members are poorly expressed, although involved in the inflammation and repair after brain injury [60]. Astrocytes represent the main source of TGF β, while selected neurons express TGF β receptors [61]. Recent reports directly and indirectly suggested the involvement of TGF β in aging-related processes, including a gradual decline in physiological functions, impaired adaptability, and endurance of tissues and organs in a lifetime [62,63,64].

As a matter of fact, during aging the expression of TGF β-related molecules in the brain increases [65]. However, the role of the TGF β signaling is not fully understood and controversial observations were reported.

Some studies reported that TGF β a beneficial role in the onset of AD, PD, and other diseases, while other reports described detrimental effects. One might speculate that, similarly to cancer, TGF β could play a dual role depending on the context [60]. Abnormalities in the TGF β pathway were described in patients affected with neurodegenerative disorders. In the plasma of AD patients, TGF β was reduced, while in the cerebrospinal fluid it was increased [65,66,67,68,69].

Controversial reports were available in patients affected with Huntington's disease, as some investigations identified an increase in the plasmatic levels of TGF β [70]. In contrast, others reported a decrease in blood levels [68].

In AD brains, the TGF β pathway is co-expressed with Tau in neurons and tangles, promoting amyloid deposition [71].

In cortical and hippocampal neurons of transgenic TβRIIΔk-Fib mouse model of systemic sclerosis expressing the truncated TGF β type II receptor (TβRII) form, the overall activity of the pathway, triggering the neurodegenerative process, accounts for a reduced number of neurons, but a higher number of astrocytes [61].

Breeding of TβRIIΔk mice to AD mouse models enhanced the presence of Aβ plaques, due to increased levels of APP, thus corroborating the role of the TGF β pathway in AD.

Controversial reports could not highlight the role of TGF β. Administration of TGF β reduced plaque formation, and rescued the Aβ-induced cognitive impairment [72]. By contrast, the overexpression of TGF β induced the onset of amyloid deposition [73,74]. In PD patients, TGF β seemed to have different implications, as it was increased in the brain [75]. The number of dopaminergic cells was significantly reduced in transgenic mouse models lacking TGF β signaling [76].

Although controversial investigations reported opposite effects of TGF β, probably reduction/loss of this pathway in neurons is likely to affect age-related memory and cognitive impairment.

5. Sirtuins

Components of the silent mating-type information regulation proteins (sirtuins, SIRT) family are involved in many cell activities, including transcription, apoptosis, response activities to various stress stimuli from inflammation to low-calorie feeding conditions, and aging [77].

The Peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) and the NAD+-dependent deacetylase SIRT1 contribute to the mitochondrial biogenesis regulating the transcription of nucleus-encoded mitochondrial genes [78]. The PGC/SIRT signaling might belong to a more complex neural pathway regulated by micro-nutrients. SIRT1 responds to nutrient-sensitive changes in basal NAD+ levels [79]. Resveratrol, a SIRT1 activator, induces mitochondrial biogenesis and protects against metabolic decline [79]. In neurons, intracellular NAD+ levels play a crucial role in viability under chronic oxidative stress, and mitochondrial dysfunction by promoting oxidative phosphorylation (ATP production) [80,81,82]. In hippocampal AD neurons and in subcutaneous adipose mesenchymal M17 cells from APP mice, the levels of PGC-1α, nuclear respiratory factor (NRF) 1, and NRF2 were reported to be significantly reduced [83,84,85]. That suggested prolonged overexpression of PGC-1α was cytotoxic for dopaminergic neurons, and might be involved in neurodegeneration [86].

6. Nrf2

The Nuclear factor-erythroid factor 2-related factor 2 (Nrf2) covers different physiological cell functions in homeostasis maintenance and during proliferation. The Nrf2 signal transduction pathway is involved in the regulation of redox balance and antioxidant-related activities [87], in the metabolic reprogramming [88], in triggering proteasome degradation [89], and participates in the transcription of detoxification, antioxidant, metabolism, or proliferative genes [90,91]. Abnormalities in Nrf2 were described in cancer progression and chemoresistance, in different tumor types [92,93,94].

The oxidative stress often underlies the pathogenic mechanisms in NDs [95,96,97]. The possible role of Nrf2 in neurodegeneration is becoming increasingly evident, since the oxidative damage response was described in the early stages of AD and PD [98,99,100]. Great interest arose in the antioxidant effects of Nrf2, as it was proposed as a possible therapeutic target. An interesting clue is represented by the different Nrf2 subcellular locations in the brains of AD-affected patients compared to the brains of PD patients. In hippocampal neurons from AD brains, Nrf2 staining was mainly cytoplasmic. By contrast, in PD dopaminergic cells, Nrf2 was mainly nuclear [98]. That suggested that in neurons under enhanced oxidative stress, Nrf2 translated to the nucleus, to induce the transcription of genes involved in the antioxidant response [98]. In AD brains, the cytoplasmic location of Nrf2 might indicate failure of neurons' acclimation to oxidative stress. In PD patients, dead dopaminergic cells did not show Nrf2 staining, but alive neurons probably maintain proper functions and Nrf2 remains in the nucleus [98].

In the hippocampus and cortex of experimental double transgenic APP/PS1 mouse models, which overexpress APP and presenilin 1 (PS1) gene mutation, the defective expression of Nrf2 and its downstream targets was observed contemporarily to the increase of Aβ aggregates [101,102,103]. Conversely, the overexpression of Nrf2 in APP/PS1 mice’s hippocampus reduced the soluble Aβ and rescued or ameliorated the learning deficits [102]. Accordingly, in other AD murine models, loss of Nrf2 induced the same effects upon Aβ deposition, spatial learning, and memory [103].

Besides the oxidative stress, the involvement of Nrf2 in the progression of neurodegenerative disorders was linked to inflammation and autophagy, due to the interconnection with the p62 autophagy receptor, a multifunctional protein located throughout the cell, involved in proteasome degradation of ubiquitinated proteins [103,104]. Interaction between p62 and Nrf2 acts as a positive feedback loop, as defective autophagy promotes the oxidative stress response and autophagy [105]. The imbalance of this complex homeostasis seems to be involved in the progression of neurodegeneration. Interestingly, a connection between TLR4 and Nrf2 was demonstrated, as Nrf2 regulates TLR4 innate responses in mouse liver ischemia/reperfusion injury via Akt/FOXO1 signaling network [105,106]. Interesting perspectives were offered by the studies which analyze the Nrf2/TLR4/NF-κB signaling in an Aβ mouse model [106].

7. STING–TBK1–IRF

The stimulator of interferon genes (STING)-mediated type-I interferon/Tumor necrosis factor receptor-associated factor NF-κB activator-binding kinase 1 (TBK1)/Interferon regulatory factor-3 (IRF33) signal transduction pathway was recently involved in neurodegeneration. STING activates the type-I interferons (IFNs), pleiotropic cytokines involved in different nervous diseases [107,108,109]. Although controversial data were reported, STING is involved in triggering the innate immune response following microbial infections. The activity of STING is related to oxidative stress conditions, as during inflammatory activation of the nervous tissue, which can be involved in neurodegeneration.

In transgenic STING−/− mouse embryonic fibroblast (MEF) SV40 immortalized cells, activating the STING pathway induced by using H2O2 can play a protective role against cell death compared to the wild type. Lack of STING prevents the increase in autophagy flux probably due to impairment at the autophagosome-lysosomal fusion step [110]. That suggested a putative role for STING in the autophagy flux maintenance and protection from H2O2-induced cell death. The STING signal transduction pathway might play a complex role in the cellular mechanisms underlying to the pathogenesis of NDs related to the response to oxidative stress. Recently, the STING signaling pathway was suggested to represent a critical molecular link, predominantly in microglia, that might be involved in the pathogenesis of AD [111].

8. PI3K/AKT/mTOR

The phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT)/mechanistic target of rapamycin (mTOR) pathway is involved in different cell activities, including survival, metabolism, differentiation, motility, and proliferation [112], and is actively studied in cancer [113,114,115]. Components of the PI3K pathway were described to be altered in NDs [116,117].

Activation of the PI3K/AKT/mTOR signal transduction was described in AD and PD. In AD neurons, activation of AKT (phosphorylated AKT, pAKT) was observed, and upregulation, as well as peculiar perinuclear location was described with no changes in total AKT levels [118]. By contrast, decreased PI3K/AKT pathway activation in AD brains was reported [119].

In PD brains, the activity of AKT decreased [120,121,122,123], and overexpression of AKT had a protective role in PD experimental mouse models [124,125,126].

Involvement of the AKT targets mTOR and Glycogen synthase kinase-3 beta (GSK3β) in autophagy, amyloid aggregation, and Tau phosphorylation was reported during the development of NDs [127]. The activated pAKT promotes the phosphorylation of either target, thus activating mTOR and repressing GSK3β [127]. In very early stages AD brains and in AD experimental models, mTOR increase occurs concurrently with a reduction of autophagy markers’ expression, suggesting that abnormalities in autophagy are related to the PI3K/AKT/mTOR signaling [127]. In AD brains, GSK3β is crucial for the phosphorylation and consequent acitvation of Tau (pTau) [127,128]. Increased Akt reduced the phosphorylation of Tau, but pTau levels are increased in the diseased brain, thus suggesting the involvement of components belonging to this signal transduction pathway in Tau pathologies [127].

9. MAPK

The complex mitogen-activated protein kinase (MAPK) superfamily comprises signaling families activated by receptor tyrosine kinases (TRKs), including MAPK/extracellular signal-regulated kinase (ERK), Big MAP kinase-1 (BMK-1), c-Jun N-terminal kinase (JNK), and protein 38 (p38) signaling families [129,130]. MAPK overall represents the point of convergence of key molecules/pathways involved in cell proliferation, growth, and survival [131]. Due to the wide network in which the MAPK pathway is involved, it is frequently altered in cancer [132].

The complex MAPK signaling plays an important role in the nervous system. In the brain, MAPK is directly or indirectly involved in the genesis of both neurons and glial cells, and in synaptic transmission, thus affecting the cognitive processes [133]. ERK, p38, and JNK are involved in striatal dopaminergic neurons’s survival and the overall dopaminergic signaling [134].

Abnormalities of one branch of MAPK promote changes in cognition and learning [135]. In the brains of AD and PD patients, the levels of phosphorylated MAPK1 and phosphorylated ERK were higher compared to normal controls [136,137,138,139]. Also in AD or PD experimental models, different components of the MAPK signaling pathways were upregulated [140]. In early-stage AD, phosphorylated p38 was upregulated [141,142]. JNKs increased in AD brains and CSF, and were suggested to be involved in the dopaminergic cell loss featuring PD [143]. In AD brains, selected members of MAPK signaling co-expressed in neurofibrillary tangles (NFTs), aggregates of hyperphosphorylated Tau protein, and senile plaques. In experimental AD models, the pharmacological or transgenic ablation of pERK, p38 and JNK rescued the cognitive impairment associated with reducing Aβ levels [144,145,146,147].

The expression of APP was related to the activity of MAPK. In fact, in an AD model, the deposition of Aβ was reduced when loss of p38 occurs associated with reduced β-secretase activity [146]. Also the inhibition of JNK is associated with the reduction of plaques in the cortex and hippocampus, decrease of secretase activity, and expression of phosphorylated APP, thus ameliorating the working memory [146].

In experimental pharmacological models of PD, abnormal expression of the most important MAPK pathways was described [134,146]. Ablation of JNK2 had a protective role against the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced PD model, [134], and pharmacological blocking of JNK3 mitigates the MPTP-induced dopaminergic cell loss [143]. In glial cells, the presence of α-synuclein induced the expression of p38, ERK, and JNK [148]. Damaged neurons released α-synuclein, triggering the microglia's pro-inflammatory response [149].

In experimental models of Huntington’s disease, increased levels of phosphorylated p38 and JNK were described in the striatum, and mutations in the huntingtin gene (HTT) affected MAPK and activated this pathway [150,151].

10. Wnt

The Wingless-related integration site (Wnt)/β-catenin pathway regulates crucial events including gene stability, cell differentiation, proliferation, apoptosis, migration, and stem cell renewal [152,153,154].

The 19 mammalian Wnt proteins bind to frizzled receptors and lipoprotein receptor-related protein (LRP) co-receptors. The binding of Wnt to its receptors suppresses the β-catenin destruction complex, composed of adenomatous polyposis coli (APC), Axin, casein kinase 1α (CK1α), GSK3β, and free β-catenin. The nuclear translation of β-catenin promotes the transcription of proliferation-related genes [155,156,157]. Cytoplasmic β-catenin might form a complex with adherent junctions, promoting cell adhesion. Abnormalities in the Wnt/β-catenin pathway were described in all the stages of cancer transformation, including initiation, progression, metastasis spread, and cancer stem cell activation [153,158,159,160,161].

The Wnt signal transduction pathway acts during brain development. Wnt proteins are involved in neurogenesis, and synapse development and activity [162]. The Wnt pathway is interconnected with several downstream signaling pathways, indirectly acting upon gene transcription and cytoskeleton modifications [162]. The role of the Wnt pathway in the mature brain is not fully highlighted [163,164]. However, several reports demonstrated that components of this pathway might be altered in age-related disorders and linked to aggregates deposition in NDs, including AD [165].

The extracellular ligand of Wnt receptors, Dickkopf-1 (DKK1), a negative regulator of the pathway, is highly expressed in cortical neurons of the diseased brain [166,167]. The co-receptor LRP6 was demonstrated to be downregulated in the temporal cortex of AD brains. This downregulation occurs contemporarily to a decrease in the expression of β-catenin, and to a less efficient translocation to the nucleus [168].

In different experimental animal models of amyloid deposition and tau pathology, increased expression of DKK1 was identified, accompanied by reduced levels of β-catenin. Impairment of the Wnt signal transduction pathway enhances amyloid deposition [167].

Dysregulation of genes regulated by the Wnt pathway was also described in PD brains [167,169], and the effects upon the dopaminergic cell loss might be linked to the role of Wnt in synapse formation and cell regeneration.

Interestingly, controversial literature data reported that the non-canonical Wnt signal transduction might play an opposite role, protecting mitochondria from fission-fusion alterations occurring in AD [170], an especially critical event for the crucial energy metabolism in neurons. In NDs, abnormalities of mitochondria morphology and functions were described, including structure alterations, deregulation of enzymatic activities, increased oxidative stress, and rising levels of Aβ. That suggested a new approach, supporting the hypothesis that the mitochondria and related signaling pathways might represent a possible therapeutic target for NDs, probably during the disease's initiation and progression [170].

11. Notch

The Notch pathway involves several physiological events, including cell proliferation, differentiation, and angiogenesis [171,172,173]. Notch acts depending on the context [174,175], and was described as involved in tumors [176,177,178,179]. Notch signaling regulates neurogenesis, neural maturation, and synaptic plasticity [180].

In the nervous tissue, Notch and related ligands were suggested to be also involved in NDs [181,182], with special regard to AD. Notch was demonstrated to play a role in forming Aβ plaques [183,184]. Notch was abnormally expressed in the brains of AD patients [185,186], and colocalized with PSs [187,188]. In the brains of AD patients, the expression of Notch increased due to the aggregation in plaque-like structures [189], probably involving the pro-inflammatory response. The Notch- and Aβ-positive plaques were invaded by microglia and astrocytes, suggesting that the delocalization of Notch might activate the pro-inflammatory response [189].

The accumulation of Notch in plaque-like structure in the brain parenchyma probably reduced the filtration to the cerebrospinal fluid [184]. In fact, in the cerebrospinal fluid of patients affected with AD, the Notch expression was lower than normal controls [184].

12. Cell Cycle Pathway

The complex process that governs the duplication of the genetic material and cell division through the cell lifetime is governed by the peculiar cell cycle pathway [190], which is highly regulated to avoid the transmission of genetic abnormalities to daughter cell clones.

Accurate checkpoints regulate the ordered progression of the cell cycle, arresting the cycle, when required, promoting DNA repair or, in case of unrepairable damage, leading to cell death.

The progression through the four phases of the cell cycle is strictly regulated by the alternate phosphorylation/dephosphorylation of cyclin-dependent kinases (CDKs) and cyclin proteins, which are actively studied in cancer [190,191,192].

Neurons usually do not undergo mitosis, but abnormal regulation of the cell cycle pathway was described in degenerated neurons [191,193,194]. Abnormal DNA replication allows neurons to re-enter the cell cycle, but the failure to divide can promote the development or progression of neurological disorders.

In the brains of patients affected with NDs, including AD, PD, Huntington’s disease and ALS, abnormal expression has been described in different cell cycle components, such as cyclins, CDKs, and related genes [195].

Depending on the brain region, some cell cycle components were upregulated in AD, such as proliferating cell nuclear antigen (PCNA), cyclin B, CDK4, CDK5 and related CDK activators [195,196,197].

In the hippocampus of both AD patients and murine AD models, the expression of an S/G2/M marker was increased [194]. Induction of Aβ accumulation in the brain of experimental AD models promoted gene expression in the cell cycle re-entry [194].

The rapid re-entering into the cell cycle seemed to gain protective effects against amyloid-induced neuronal death [194]. Moreover, cell cycle components are indirectly involved in the hyperphosphorylation of Tau, which is implicated in the dysregulation of the cell cycle in AD [198]. As an interesting perspective, the dysregulation of the cell cycle was studied as a possible therapeutic target for AD. The pharmacological inhibition of cell cycle-related genes, such as the modulation of the abnormal activity of CDK5, rescued symptoms in AD murine models [197].

In PD, PCNA, retinoblastoma protein (Rb), CDK2 and CDK5 were abnormally expressed [199]. In Huntington’s disease, increased levels of cyclin D1 [199], inducing the expression of the normal Htt gene in YAC-18 experimental models of Huntington’s disease, lead to the re-entry of neurons in the cell cycle, and induced reactive neuroblastomas [200].

In experimental PD models, neurons also present the cell cycle pathway dysregulation. In dopaminergic PD neurons, treatment with MPTP induces the expression and activity of CDK5, while pharmacological inhibition attenuates the MPTP-induced dopamine cell loss. Also the expression of cyclin B is enhanced by overexpression of α-synuclein [201,202].

13. Myc

The Myc family comprises regulator genes and proto-oncogenes, consisting of three related paralog human genes, namely c-MYC, n-MYC and l-MYC [203,204]. The overall structure and organization of the Myc family members are very similar. The MYC family member c-Myc [205] is a transcription factor crucial to many cell functions, including cell growth and metabolism, proliferation, and apoptosis. The activity of c-Myc is tightly related to other pathways, including the Ras/Phosphoinositide 3-kinase (PI3K)/AKT/GSK3, Ras/Raf/ERK, and Wnt pathways [206,207,208,209,210]. Dysregulation of Myc was described in the tumorigenesis or progression of different cancers [211,212,213,214,215,216].

In NDs, the possible role of Myc was related to cell cycle re-entry in both the onset and development of AD and other NDs [217]. Dysregulation of Myc members was described in the brains of AD and Huntington’s disease patients [218,219].

Interestingly, the expression of n-Myc was reduced in AD brains [218], while in Huntington’s disease c-Myc expression was affected [219]. In PD brains no differences in the expression pattern of Myc members were observed [219].

In the AD hippocampus, no differences were reported in total c-Myc expression, while the phosphorylation state was abnormal [219]. In AD, Pick’s disease, and other NDs, phosphorylated c-Myc was detected in neurons positive for NFTs and around senile plaques [219]. In both the human AD brain and in the brain of the murine tg-arcswe AD model, which overexpresses human APP and featured by perivascular and neuropil-confined plaques, the transcript levels of the gene encoding for c-Myc were enhanced [220].

By using the CaMKII-Myc transgenic mouse, conditionally expressing c-Myc in neurons, the increased expression of c-Myc induced neuronal loss in the hippocampus and memory impairment [221]. In the hippocampus of AD patients, the Neuregulin 2, codified by the n-Myc downstream-regulated NDRG2 gene (OMIM * 603818), a cell stress response gene primarily expressed in astrocytes, were increased compared to normal controls [222].

In pharmacological and genetic murine models of AD, knockout of Ndgr2 worsened the AD-like phenotype [223], and induced downregulation of the proteasome activity. Moreover, enhanced expression levels of NRG2 were related to the increased APP, triggering the presence of Aβ plaques [223].

14. p53

The protein p53 is mainly involved in the cell response to stress, including DNA damage, ribosomal stress, telomere erosion, hypoxia, and oxidative stress [224,225], and its role as a tumor suppressor is well known.

In NDs, the levels of p53 are not altered, but the protein's location differs [226,227,228,229,230].

In AD and PD brains, p53 and its phosphorylated form (p-p53) are located in the cytoplasm, while in control brains both are located in the nucleus [230]. Probably, abnormal neuronal cytoplasm-nucleus transport depends on the presence of p53 aggregates, and destabilization of the organization of cytoskeletal microtubules in the perinuclear area occurs. The abnormal cytoplasmic location of p53 in NDs’ neurons was related to both tau and amyloid pathologies, as p53 interacts with Tau and PS1.

In AD experimental models, APP, Tau, and PS1 expression can modulate the levels of p53. In the brains of PS- or βAPP-deficient mice, lack of PS1 or APP reduced the expression of p53 [231]. In AD, p53 correlated to the transcription of PSEN1 (OMIM *104311), the gene which codifies for PS1, while in PD reduced the transcription of genes codifying for Parkin (PRKN; OMIM *602544) and α-synuclein, (SNCA; OMIM *163890) probably with a reciprocal regulatory loop [232,233].

In the brains of patients affected with Huntington’s disease, p53 levels were high, and its expression positively correlated with the severity of clinical manifestations [234]. As p53 binds huntingtin, in experimental HdhQ140/Q140 mouse models, overexpressing mutant forms of the gene which codifies for huntingtin (Htt; MGI 96067), the deletion of p53 seemed to rescue the neurodegeneration and behavioral abnormalities [234,235].

In DAT-p53KO mouse PD experimental models, deleting p53 in dopaminergic neurons had a protective role from the MPTP-induced neurodegeneration, ameliorating motor coordination [236].

15. Hippo

Hippo signaling (or Salvador-Warts-Hippo-SWH pathway) is an evolutionarily highly conserved pathway, identified as a regulator of organ size. Organ growth relies on several processes, including division and apoptosis. The name derives from the protein kinase Hippo (Hpo), a key signaling component of the pathway in Drosophila. Mutations in the hop (FlyBase CG11228), a gene that codifies for Hpo, result in tumor tissue overgrowth (hippopotamus-like phenotype) [237]. Hippo signaling involved many processes, including cell differentiation, tissue regeneration, and mechanic transduction [238,239,240].

The Hippo pathway activates the mammalian sterile 20-like kinases 1 and 2 (MST1/2), which in turn phosphorylates the complex formed by Yes-associated protein (YAP) and Trascriptional Coactivator with PDZ-bindin Coactivator with PDZ-binding motif (TAZ), involved in different regulating mechanisms, including those regulating the angiogenesis [241]. The transcriptional co-activators YAP/TAZ are activated by modifications of the subcellular localization and of the structure stability by phosphorylating upstream kinases, such as Large tumor suppressor 1 (LATS1) and 2 kinases (LATS2) [242]. Phosphorylated YAP remains in the cytoplasm, marked for proteasome degradation. Non-phosphorylated YAP translates to the nucleus, where it interacts with different transcription factors triggering the transcription of different genes involved in cell proliferation and survival [239,243].

Both inactivation of the Hippo pathway and/or constitutive activation of YAP leading to YAP overexpression and nuclear location have been reported. Also the aberrant location of YAP promotes the transcription, especially of genes involved in metastasis spreading, in favoring the maintenance of the tumor microenvironment, or anti-apoptosis genes [244,245].

The Hippo pathway-related genes were down-regulated in different regions of the brains of patients affected with AD [246,247]. In AD experimental models, the transcription of YAP is downregulated early. The intracellular localization of YAP was abnormal in the brains of patients both affected with AD and presenting with mild cognitive impairment (MCI) [248]. In cortical neurons, the Aβ complex sequestrates YAP, increasing the cytoplasmic levels and contemporarily reducing the nuclear levels.

In experimental AD models, YAP was identified in the cytoplasm even before the onset of symptoms [248]. Moreover, overexpression of YAP increased the levels of nuclear YAP, reducing extracellular Aβ plaques, and ameliorating some behavioral parameters in experimental models [248].

Although the greatest interest arose about the role of the Hippo pathway in cancer, it has been well-studied in the developing brain and, more recently, in the adult brain for the possible involvement in neurodegeneration [249,250].

Changes in YAP location were detected in the brains of patients affected with Huntington’s disease [251]. In cortical neurons from Huntington’s disease brain, YAP is mainly localized in the cytoplasm. In experimental HdhQ111/Q111 murine models of Huntington’s disease, high levels of total YAP and phosphorylated YAP, the inactive form, were detected in the striatum and cortex [251].

The cytoplasmic localization of YAP in the neurons of AD and of Huntington’s disease patients seems to be related to the so-called TEA domain (TEAD)-YAP dependent necrosis (TRIAD), described in different experimental models of NDs [252]. TRIAD is characterized by enlargement (ballooning) of the endoplasmic reticulum (ER), probably driven by the presence of YAP in the cytoplasm. The morphology of the ER can be reversed by YAP overexpression [248].

Also further components belonging to the Hippo pathway, such as MST1 and LATS1/2, were suggested to be involved in the progression of NDs [253,254].

Abnormally high levels of phospho-MST1 were reported in the motor neurons of the spinal cord of ALS patients and in experimental models [171]. In PD, MST1 is involved in the loss of dopaminergic neurons.

The Activated MST1 acts upon the Uncoordinated 5 Homolog B receptor (UNC5B), a pro-apoptotic netrin family receptor, inducing motor dysfunctions and reduction of dopaminergic cell number in the substantia nigra [253]. Also MST1 was overexpressed in the brains of patients with Huntington’s disease [248].

16. Rho

The small GTPase of the Rho family Ras homolog gene family member A (RhoA) and related downstream effector proteins regulate multiple signal transduction pathways in many cellular functions. The RhoA complex is abundantly expressed in the nervous system, and recent evidence suggested the involvement of aberrant RhoA signaling in NDs [255].

In the substantia nigra of mice treated with MPTP, upregulation of RhoA and Rho-associated protein kinase (ROCK) was observed [256]. In both neurons’ cultures and murine models, the inhibition of ROCK seems to play a neuroprotective effect from the MPTP-induced dopaminergic cell death [256,257], probably due to the inhibition of the MPTP-induced microglial inflammatory response [258,259].

The RhoA pathway is increased in human stem cell-derived neurons bearing mutations in the Parkinson's disease 2 (PARK2; OMIM #600116) gene. In PARK2 knockout neurons, an increase in the activity of RhoA modified the migration and reduced the formation of neurites, rescued by using the RhoA inhibitor Rhosin [260]. Also in cultured neurons both hippocampal and dopaminergic treated with the neurotoxic pesticide rotenone, the activity of RhoA was increased and associated with reduced neurite outgrowth, rescued by using the ROCK inhibitor Y27632 [261]. In primary mouse mesencephalic cultures, rotenone increased the activity of RhoA. By contrast, the inhibition of RhoA using C3 transferase or Simvastatin protected the dopaminergic neurons against the effects of rotenone [262]. In this perspective, RhoA signaling represents a promising target for the therapy of neuritic and axonal degeneration, one of the earliest features of PD [263].

In MN9D dopaminergic neurons, derived by the fusion of embryonic ventral mesencephalic and neuroblastoma cells, the inhibition of RhoA reduced the expression of α-synuclein by reducing the Serum response factor (SRF), a ubiquitous nuclear transcription factor [264]. In dopaminergic neurons and in PC12 pheochromocytoma-derived cells, the inhibition of RhoA by using the microRNA miR-133b, which is involved in the maturation and function of midbrain dopaminergic neurons within a negative feedback loop, attenuated MPTP-induced upregulation of α-synuclein, reducing the axon degeneration [265]. In vivo experiments in a transgenic murine model expressing human α-synuclein bearing the missense A53T mutation associated with PD, the inhibition of ROCK mediated by the ROCK inhibitor Fasudil reduced the aggregation of α-synuclein, ameliorating motor and cognitive functions [266]. In SH-SY5Y neuroblastoma-derived cells overexpressing A53T, Fasudil induced α-synuclein clearance by activating autophagy via the JNK/Bcl-2/Beclin 1/Vps34 pathway [267]. In the microglia, integrin CD11b mediates α-synuclein-induced production of reactive oxygen species (ROS) through a Rho-dependent pathway involving the nicotinamide adenine dinucleotide phosphate [NADPH] oxidase (NOX) [268].

In MPTP-treated PC12 cells and in an MPTP murine model, the treatment with Y27632 rescued the aberrant mitochondrial fission and apoptosis mediated by Dynamin-related protein 1 (Drp1) [269].

Recent evidence demonstrated that inhibition of ROCK enhanced Parkin recruitment to damaged mitochondria, promoting the removal of damaged mitochondria from the cells [269,270,271,272,273,274].

In the substantia nigra and striatum of 6-hydroxydopamine lesioned rats with a dyskinesia rat model of PD, RhoA and ROCK increased. At the same time, Fasudil prevented L-DOPA-induced dyskinesia or inhibited the already established dyskinesia, thus affecting the therapeutic effect of L-DOPA [275]. Also in PD, the pathway of RhoA might represent a possible target for a new therapeutic approach for more advanced stages of the disease.

17. Conclusions

The cognitive and physical decline of patients with NDs represents an economic and social burden, as well as an enormous psychological burden for the patients' families. Many research efforts identified important events involved in neurodegeneration, but the complex pathogenesis of NDs is far from being fully elucidated. The death of neurons is the main feature of NDs. Two large and ambitious lines of research have emerged: the first aims at avoiding neuronal death, and the second aims at neurogenesis.

Concerning the first objective, unraveling the numerous and complex intracellular mechanisms that lead to the death of neurons could slow down or, very optimistically, block this event. More recently, insights into the signal transduction pathways acting in the nervous system contributed to unveiling molecular mechanisms triggering neurodegeneration. Intra- or inter-cellular signaling was indicated as a crucial player in the pathogenesis of NDs, whose ever-growing list needs continuous updates. Effectors and/or components of the signaling pathways were identified to be involved in the progression, and probably also in the initiation, of NDs. The extensive and complex cross-talk among the signal transduction pathways acting in the nervous system and the alterations/dysregulation occurring at the onset or during the progression of NDs make it difficult to understand the mechanisms underlying physiological and pathological events. Although many efforts have been made to obtain an overall and global view of the pathogenesis of NDs, this is still far from being achieved. Surely the recent advances in signal transduction in the nervous system, both normal and pathological, have increased the knowledge in the field. Identifying all signal transduction pathways recruited in the nervous system and of the crossing points could represent a promising starting point for a better understanding of the mechanisms underlying the pathogenesis of NDs.

Currently, the signaling pathways underlying or contributing to NDs were not fully identified, and the signal transduction events perturbed in NDs have not been fully recognized. Understanding the complex signal transduction pathways and cascade interconnections that impact the nervous system homeostasis might improve our understanding of nervous system development. Likewise, in-depth and complete knowledge of alterations of signal transduction molecules occurring in NDs might offer promising insights for the understanding of the mechanisms related to the initiation and/or progression of neurodegeneration and, as far as one can see, might pave the way for a wide panel of putative targets for the modulation of therapeutic approach, improving current therapies.

Acknowledgments

The author wishes to thank Dr Filip Hoibakk for English language editing.

Author Contributions

The author did all the research work of this study.

Competing Interests

The author has declared that no competing interests exist.

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