Exposure to Environmental Toxicants: Glymphatic System Dysfunction and Its Implications on Neurodevelopmental Disorders
Mojtaba Ehsanifar 1,*
, Akram Gholami 2
, Reyhaneh Shenasi 3
, Nioosha Pahnavar 2
, Maryam Golmohammadi 2![]()
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Department of Environmental Health, Torbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
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Department of Nursing, Torbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
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Department of Public Health, Torbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
* Correspondence: Mojtaba Ehsanifar
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Academic Editor: Fabrizio Stasolla
Received: October 30, 2025 | Accepted: April 20, 2026 | Published: April 27, 2026
OBM Neurobiology 2026, Volume 10, Issue 2, doi:10.21926/obm.neurobiol.2602333
Recommended citation: Ehsanifar M, Gholami A, Shenasi R, Pahnavar N, Golmohammadi M. Exposure to Environmental Toxicants: Glymphatic System Dysfunction and Its Implications on Neurodevelopmental Disorders. OBM Neurobiology 2026; 10(2): 333; doi:10.21926/obm.neurobiol.2602333.
© 2026 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
The glymphatic system is a glia-dependent network surrounding blood vessels that facilitates the exchange of cerebrospinal fluid (CSF) and interstitial fluid, playing a crucial role in clearing neuro-metabolites from the brain. This system’s efficiency in transporting waste significantly increases during non-rapid eye movement non-REM sleep. Recent findings suggests that malfunctioning of the glymphatic system might be linked to neurodevelopmental disorders such as attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder (ASD), and schizophrenia (SCZ), all of which often correlate with disturbed sleep patterns. Furthermore, various environmental toxicants have been shown to affect neurodevelopment negatively. Exposure to these toxicants early in life disrupts the sleep/Blood-Brain Barrier (BBB)/Aquaporin-4 connections, impairs the glymphatic system’s ability to clear substances like amyloid-beta (Aβ), tau proteins, and inflammatory mediators, ultimately skewing neurodevelopment toward an increased risk of disorders. In summary, this narrative review consolidates existing evidence. It highlights key priorities for examining the relationship between the exposome, the glymphatic system, and neurodevelopmental pathways, aiming to pave the way for future research and therapeutic interventions.
Keywords
Environmental toxicants exposure; glymphatic system; neurodevelopmental disorders
1. Introduction
Neurodevelopmental disorders encompass a group of clinical conditions that appear in early developmental stages, marked by difficulty in personal, social, academic, or occupational areas, as identified by the American Psychiatric Association in 2022. Among these disorders, Autism Spectrum Disorder (ASD) and Attention-Deficit/Hyperactivity Disorder (ADHD) are the most common [1]. Although not officially classified under neurodevelopmental disorders by the DSM-5-TR, a growing body of evidence points to the neurodevelopmental roots of schizophrenia, corresponding conceptually with this group [2,3]. High prevalence of comorbidities is a shared characteristic of all neurodevelopmental disorders [4,5]. The diverse clinical presentations and complex pathophysiologies of neurodevelopmental conditions pose significant hurdles for early diagnosis and treatment [6]. Over 200 high-risk genes have been identified, influencing critical biological processes like synaptic function, transcriptional regulation, and epigenetic mechanisms [7]. Environmental factors are also critical in the emergence and progression of neurodevelopmental disorders, acting through oxidative stress, neuroinflammation, and epigenetic modifications, which ultimately result in structural and functional changes in the brain [8,9,10]. The interplay between genes and environment underscores why individuals with genetic predispositions are more susceptible to environmental hazards. Hence, the concept of the exposome—the collected environmental exposures throughout a person’s life and their impact on brain health—has gained significance [11,12]. Toxic heavy metals are well documented for their ability to disrupt enzymatic functions, modify cell signaling, induce neuroinflammation, and foster oxidative stress, linking them to neurodevelopmental disorders [13,14]. The study of the glymphatic system is a comparatively new frontier in scientific inquiry, having been proposed only in 2012 and experiencing notable advancements starting around 2015 [15]. The glymphatic system has become a focal point as a major pathway connecting environmental impacts to neurodevelopmental consequences. It manages waste removal via cerebrospinal fluid (CSF) directed from the subarachnoid space into the brain’s interstitium through astrocytic aquaporin-4 channels along perivascular spaces. The CSF moves into perivenous spaces and meningeal lymphatic routes, eventually reaching cervical lymph nodes, predominantly during sleep, which enhances glymphatic clearance [16,17]. A dysfunctional glymphatic system can compromise protein clearance, lead to the build-up of misfolded proteins, and alter neuroinflammatory responses [18,19]. This suggests it may act as a unifying mechanism between toxic exposures and susceptibility to neurodevelopmental disorders. This mini-review aims to synthesize empirical evidence on the interconnections between environmental toxins, glymphatic system dysfunction, and neurodevelopmental disorders, examining shared biological processes and evaluating potential intervention strategies.
2. Neurodevelopmental Disorders and Glymphatic System Dysfunction
The link between the glymphatic system and neurodevelopmental disorders like ASD, ADHD, and SCZ is gaining significant focus [20,21]. Specifically, in autism spectrum disorder (ASD), studies have shown consistent changes in perivascular spaces (PVS). Enlargement of these spaces can be observed as early as 24 months, correlating with a higher likelihood of ASD diagnosis and more severe symptoms such as verbal dysfunction and sleep issues [22,23]. Furthermore, increased volumes of extra-axial cerebrospinal fluid in children aged 6 to 24 months indicate a potential relationship between PVS dilation and impaired glymphatic function early in life [24,25]. Sex differences in ASD are noted, with boys showing greater PVS volume in the white matter than girls, which is linked to insomnia [26]. Advanced imaging approaches such as diffusion tensor imaging along the perivascular space (DTI-ALPS) support the notion of glymphatic dysfunction in ASD, showing lower values than in healthy individuals [23]. The DTI-ALPS index tends to increase with age, suggesting a decline in glymphatic function over time [27]. Comparing individuals with ASD to those with ADHD using both DTI-ALPS and diffusion kurtosis imaging (DKI-ALPS) has revealed a reduced index in ASD, which correlates with higher severity and worse developmental outcomes [22,23]. The DKI-ALPS is more sensitive for detecting alterations in the glymphatic system [28]. ADHD findings show increased PVS volume and changes in CSF diffusivity in children compared to their non-ADHD peers [29]. Furthermore, reduced DTI-ALPS values are linked to inattention symptoms and, in adults, correlate with poor visual memory performance [21]. This highlights persistent glymphatic issues in ADHD across the lifespan, potentially tied to cognitive deficits. Schizophrenia (SCZ) follows a similar pattern, with reduced DTI-ALPS values linked to cognitive difficulties, particularly in visuospatial, attention, and orientation domains [30]. A study has shown a connection among DTI-ALPS, cognitive performance, and gut microbiota composition, pointing to a potential gut-brain axis in this context [31]. Markers like PVS changes and extra-axial CSF can serve as early indicators in ASD, ADHD, and SCZ, aiding earlier diagnosis [29,32]. Recent findings support the idea that childhood PVS enlargement indicates impaired CSF circulation with potential consequences for neurodevelopment and long-term cognitive outcomes [24]. These findings collectively highlight the role of sleep-dependent glymphatic dynamics as a potential mechanism linking inflammation, BBB integrity, and solute clearance in neurodevelopmental disorders.
3. Hazards of Environmental Toxicants
The primary categories of hazardous substances include heavy metals, pesticides, hydrocarbons, solvents, radioactive elements, and improperly disposed pharmaceuticals and cosmetics [33]. Approximately 7 million deaths yearly are linked to global environmental pollution, as reported by Rentschler and Leonova [34]. The detrimental impact of conventional toxicants like pesticides is well-documented in scientific research, posing significant risk factors for developing malignant tumors [35,36]. Studies confirm that agricultural workers exposed to chemicals like glyphosate and atrazine exhibit increased cancer incidences. Moreover, communities near farming areas demonstrate similar health concerns. Research findings highlight notable links between pesticide exposure and enhanced risks of non-Hodgkin’s lymphoma, leukemia, and bladder cancer [37,38].
3.1 Exposure to Microplastics and Nanoplastics
New findings have identified additional hazardous substances that affect both the environment and human health, including microplastics (MP) and nanoplastics (NP) [39]. MPs are categorized as primary, originating from personal care products like exfoliants and toothpaste, and as secondary, resulting from the breakdown of larger plastics—the latter posing greater health hazards [39,40]. Exposure to MPs occurs through diverse pathways, including ingestion via contaminated food, inhalation, and dermal contact [23]. Notably, ingestion is primarily linked to water pollution and bioaccumulation of pollutants in marine life consumed by humans [41,42]. Meanwhile, inhalation exposure can occur from atmospheric MPs emitted by sources such as automotive tire wear [43,44,45]. Dermal contact is particularly associated with NPs in personal care products [46,47]. The interaction of MPs and NPs with the human body can disrupt various physiological systems, causing oxidative stress, activating inflammatory pathways, and inducing toxicity at both cellular and neurological levels [23,40,48]. Animal studies show that prenatal exposure to MPs can alter neurotransmitter levels in the brain, reduce cortical layer thickness, and lead to anxiety and memory deficits, indicating potential interference with crucial brain development [49].
3.2 Exposure to Endocrine Disrupting Chemicals
In conjunction with pesticides and microplastics, numerous toxic substances have been shown to affect multiple physiological systems and disrupt critical biological functions necessary for maintaining homeostasis, including gametogenesis and pregnancy. Among these substances, endocrine-disrupting chemicals (EDCs) are particularly significant, as they interfere with hormonal signaling, leading to abnormal endocrine system function [50]. Research indicates that EDCs, such as heavy metals, polyfluoroalkyl substances (PFAS), bisphenols (BPs), and parabens, can reduce sperm motility and volume in men [51]. In women, these EDCs can cross the placental barrier, leading to bioaccumulation in the fetus [52]. The consequences of these alterations include negative effects on reproductive and neurodevelopment, and an increased risk of prematurity [53].
3.3 Emerging Pollutants
With modernization and industrialization, the risk of exposure to emerging pollutants has inevitably increased. Emerging pollutants are substances that are not yet subject to relevant management policies or emission control standards, but are likely to be included in the controlled object based on their frequency of detection and potential health risks [54]. Emerging pollutants have been newly discovered in the environment or, if previously known, have only recently come to attention [55]. Emerging pollutants are usually characterized by serious hazards, hidden risks, environmental persistence, bioaccumulation, extensive sources, and complex management [56]. Emerging pollutants that have recently attracted widespread international concern are broadly divided into three categories: endocrine-disrupting chemicals (EDCs), persistent organic pollutants (POPs), and pharmaceutical and personal care products (PPCPs), with overlap among them. Exposure assessment studies of emerging pollutants often rely on structural models because these pollutants are difficult to observe directly, and the mechanisms and manifestations in the body after exposure are complex [52,57]. Some risks associated with exposure to emerging pollutants are shown in Figure 1. Among newer contaminants, PFAS have shown potential in affecting neurodevelopment, though more evidence is needed to tighten the connection between PFAS and ASD [58]. Findings suggest detrimental impacts on cognitive functions in children, with boys showing particular susceptibility to these influences [59].
Figure 1 Emerging Pollutants Risks.
4. Health Effects of Environmental Toxicants
4.1 Immune System Imbalances
Toxicants are also linked to immune system imbalances. One study examined the consequences of exposure to environmental pollutants on systemic and airway inflammation and altered modulation of the immune response. Cytokines like IL-8, IL-6, IL-1, IL-4, and TNFα were identified as stable biomarkers, along with nitric oxide and CD4/CD8 immune markers [60]. Additionally, epigenetic changes, including DNA methylation modifications and histone alterations, were observed. Another study focused on an animal model exposed dermally to PFAS, noting reduced populations of B cells, NK cells, and macrophages in the spleen, along with increased CD4+ and CD8+ T lymphocytes in the dermis, indicating an attenuated humoral immune response [61]. Similarly, children living in high-pollution areas showed reduced B lymphocyte counts and serum C3/C4 levels, with increased monocyte counts and proportions of CD8+ T lymphocytes, suggesting immunosuppression and an associated inflammatory adaptation [62].
4.2 Maternal Immune Activation Theory
The maternal immune activation (MIA) theory suggests that systemic inflammation during pregnancy—often due to infection or inflammatory insults—alters the intrauterine environment (cytokines, fetal microglia, placenta–brain axis), leading to reprogramming of neurodevelopment and increased risks for neurodevelopmental disorders like ASD and ADHD [63,64].
4.3 Impact on the CNS
Beyond peripheral effects, various toxicants have significant impacts on the central nervous system (CNS). Recent research links air pollution to oxidative stress, inflammation, and BBB impairment, all of which contribute to the onset of neurological disorders [65,66,67,68]. New findings suggest that both direct and indirect exposure to toxins affect neurodevelopment. Nonetheless, isolating their effects within individual biological systems is challenging due to pleiotropy, complex exposure mixtures, variations in developmental windows of susceptibility, and context-dependent interactions.
4.3.1 Environmental Pollutants, the Glymphatic System, and Neurodevelopment
Environmental pollutants have wide-ranging health implications, but their impact on the brain is especially significant. Research consistently reveals connections between exposure to various pollutants during pregnancy and childhood and the onset of neurodevelopmental disorders.
Research illustrates that fine particulate matter, particularly PM2.5, is positively correlated with several neurodevelopmental issues. For instance, PM2.5 has been linked to ADHD. ASD association stands at an OR of 1.10 (95% CI: 1.04 to 1.17). Schizophrenia (SCZ) correlations, as indicated by biological aging markers, highlight changes in serum glycerophospholipid metabolites. Moreover, PM2.5 exposure has been linked to changes in gut microbiota [69]. There is a noted link between prenatal O3 exposure and the development of ASD. Evidence points to an association between NO2 exposure and both ASD and broader neurodevelopmental challenges. Persistent associations between Benzene and Nickel and ADHD have been noted [70].
4.3.2 Toxicants and the Glymphatic System
Within this scope, while the precise influence of toxicants on the glymphatic system remains to be fully elucidated, there is already evidence that various pesticides and herbicides, including glyphosate and rotenone, interact with mechanisms pertinent to glymphatic system function. Intriguingly, experiments have demonstrated that glyphosate, at varying doses, can breach the blood-brain barrier and accumulate in the mouse brain in vivo. Additionally, glyphosate exposure in vitro has increased Aβ40-42 production and diminished cell viability in primary cortical neurons. These findings align with the theory that glyphosate could provoke neuroinflammation, thereby contributing to alterations associated with neurodegenerative diseases [71]. Conversely, rotenone has been robustly associated with pathological changes and clinical manifestations similar to those observed in Parkinson’s disease patients, such as the development of α-synuclein aggregates in neurons and inflammatory shifts [72]. Recent research on rotenone-induced Parkinson’s disease has revealed that this neurotoxin markedly diminished the influx of Texas-Red Dextran 40 kDa and fluorescein isothiocyanate tracers into the brain following a cisternal injection, while significantly heightening tracer retention within the brain parenchyma. Collectively, these results suggest a functional impairment of the glymphatic system following pesticide exposure [73]. Moving the focus from pesticides to another toxic substance, polystyrene nanoplastics have been shown to impair glymphatic system function in preclinical research considerably. A recent study involving intranasal delivery of this compound in mice resulted in increased brain bioaccumulation, heightened levels of Aβ and p-Tau proteins, disruption of polarized astrocytic aquaporin-4 expression in astrocytic endfeet, induction of neuroinflammation, and eventual cognitive impairment [74].
5. Potential Therapeutic Interventions
Understanding how the glymphatic system functions at the intersection of neurodevelopmental disorders and environmental toxin exposure opens the door to developing new therapeutic approaches. Dysfunction of the glymphatic system, often tied to oxidative stress, neuroinflammation, and BBB impairment, as noted by various studies [18,75], suggests that targeting this system could yield significant therapeutic benefits. Evidence suggests that physical activity-based interventions can positively influence glymphatic function. In APP/PS1 transgenic mice, swimming exercise increased astrocytic aquaporin-4 expression and promoted its polarization at the ends of perivascular astrocytes, thereby decreasing Aβ plaque formation [76]. Similarly, another study using an animal model found that voluntary circular exercise promoted glymphatic clearance of Aβ, increased astrocytic aquaporin-4 polarization, and improved cognitive deficits and anxiety-related behaviors [77]. Although these models are linked to neurodegenerative diseases, a connection between Aβ deposition and toxicant exposure in neurodevelopmental disorders is plausible, as these conditions share similar pathophysiological features [27].
6. Pharmacological Interventions
Recent studies highlight certain drugs with potential effects on the glymphatic system. Dexmedetomidine, a highly selective α2-adrenergic receptor agonist, has been shown to lower pro-inflammatory cytokines and prevent neuronal apoptosis [78]. In a related animal study, dexmedetomidine increased CSF flow and reduced the risk of accumulation of metabolic waste products [79]. Similarly, when administered in an intracerebral hemorrhage model, simvastatin restored the glymphatic system’s integrity through the VEGF-C/VEGFR3/PI3K-Akt pathway [80]. Another study in the same model showed that melatonin had a neuroprotective effect, enhancing glymphatic transport recovery and preventing BBB impairment [81].
7. Mitigating Toxicant Effects
The negative impact of toxic substances on the brain can be mitigated with specific antioxidant, anti-inflammatory, and chelating agents that reduce toxin burdens and safeguard neurovascular integrity. Experimental findings have demonstrated that combining deferiprone with N-acetylcysteine entirely reversed brain dysfunction caused by iron overload by restoring the BBB, mitochondrial function, and synaptic plasticity [82]. Moreover, advances in nanotechnology, such as the use of liposomes, exosomes, and dendrimers for the delivery of anti-inflammatory agents to the brain, offer promise [83]. These nanocarriers aim to reduce neuroinflammation, offering an innovative approach to mitigating the effects of environmental toxicants on the CNS.
8. Limitations and Future Directions in Glymphatic Research
In our examination, we attempt to outline how the glymphatic system’s operation and structure might be associated with neurodevelopmental disorders such as ASD, SCZ, and ADHD, particularly considering the influence of environmental toxicants in these processes. Nevertheless, to date, only a limited number of investigations have thoroughly explored this potential relationship. Even with the noteworthy escalation in research publications in recent years, this domain is still in its developmental stages, necessitating further original studies to solidify its translational potential [15]. Furthermore, the complexity and multifactorial nature of neurodevelopmental disorders remain an enigma, further complicating efforts to elucidate their relationship to environmental toxicant exposure and glymphatic system function.
9. Comprehensive Findings on Environmental Toxicants
Current studies underscore the crucial role of the glymphatic system in clearing the brain of metabolites generated by neuroinflammatory and oxidative stress responses. Based on this understanding, we propose a broader investigational scope beyond traditional mechanisms, emphasizing the potential modulation of glymphatic system efficacy in neurodevelopmental disorders by extensive environmental exposure spanning progenitors’ lifetimes, and during gestation, as well as the exacerbation of symptoms in patients with these disorders.
Various environmental toxicants have been linked to unfavorable neurodevelopment, including fine particulate matter (PM2.5), other air pollutants like ozone (O3) and nitrogen dioxide (NO2), metals (such as lead with mixed findings for mercury), PFAS, pesticides (like glyphosate), heavy metals (including methylmercury and lead), and nanoplastics. Preclinical findings suggest potential mechanistic pathways by which these pollutants interfere with the BBB, disrupt astrocytic aquaporin-4 polarization at astrocytic end feet, impair the exchange of cerebrospinal fluid and interstitial fluid, and heighten neuroinflammation—culminating in glymphatic dysfunction.
Overall, this body of research suggests that various environmental toxicants can significantly influence brain physiology and development, presenting notable links with both neurodevelopmental disorders and the glymphatic system. Although no research has directly examined the effects of toxicants on the glymphatic system in the context of neurodevelopmental disorders, a hypothesis holds that early-life exposure to toxicants may elevate the risk of glymphatic dysfunction and subsequent neurodevelopmental issues.
10. Future Directions and Research Recommendations
Early-life environmental exposures disrupt crucial axes, such as the BBB and astrocytic aquaporin-4, thereby hindering the glymphatic system’s clearance of solutes like amyloid-beta, tau, and inflammatory mediators. This can skew neurodevelopmental trajectories, elevating the risk of heightened conditions in patients with neurodevelopmental disorders. To rigorously examine this proposition, future research must blend exposome evaluations with glymphatic system-specific neuroimaging (e.g., DTI-/DKI-ALPS), cerebrospinal fluid biomarkers, and tangible sleep metrics. Studies should be designed to differentiate by disorder subtypes and developmental stages.
Noteworthy evidence gaps persist, including the lack of focused studies testing toxicant impacts on the glymphatic system in neurodevelopmental disorder populations, limited longitudinal study designs spanning sensitive periods, insufficient attention to sex differences and exposure mixtures, and the absence of glymphatic system endpoints amenable to translation. The intersection of the glymphatic system, toxicants, and neurodevelopment represents an exciting yet underexplored field. Addressing these gaps could enhance our understanding of disease mechanisms, fostering novel prevention and therapeutic strategies and providing pathways for new approaches.
11. Conclusion
In summary, research corroborates substantial links between environmental toxicants and several neurodevelopmental disorders. This connection underscores the critical importance of minimizing exposure, especially during early developmental stages. Consistent with this perspective, dysregulation of the glymphatic system may provide a mechanistic connection between environmental toxicant exposure and the onset or progression of neurodevelopmental disorders. By integrating strategies targeting the glymphatic system with preventive actions and toxicant protection, a promising approach for treating and managing neurodevelopmental disorders can be developed.
Abbreviations

Acknowledgments
This work was supported by Dr. Ehsanifar research lab.
Author Contributions
ME Conceptualization, Supervision and Writing – original draft – review & editing; AGH and NP and RSH and MG Writing – review & editing. All authors have read and agreed to the published version of the manuscript.
Funding
None of the funding sources had any role in the study design, in the writing of the manuscript, or in the decision to submit the article for publication.
Competing Interests
All the authors declare that there are no conflicts of interest.
Data Availability Statement
No data was used for the research described in the article.
AI-Assisted Technologies Statement
No Generative Artificial intelligence (AI) was used in the preparation of this manuscript and AI tools were used solely for basic grammar correction and language refinement in the preparation of this manuscript. Specifically, OpenAI’s ChatGPT was employed to improve the readability and linguistic clarity of the English text. All scientific content, data interpretation, and conclusions were developed independently by the authors. The authors accept full responsibility for the content of the manuscript.
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