Perinatal exposure to pesticides alters synaptic plasticity signaling and induces behavioral deficits associated with neurodevelopmental disorders
Open accessAbstract
Increasing evidence from animal and epidemiological studies indicates that perinatal exposure to pesticides cause developmental neurotoxicity and may increase the risk for psychiatric disorders such as autism and intellectual disability. However, the underlying pathogenic mechanisms remain largely elusive. This work was aimed at testing the hypothesis that developmental exposure to different classes of pesticides hijacks intracellular neuronal signaling contributing to synaptic and behavioral alterations associated with neurodevelopmental disorders (NDD). Low concentrations of organochlorine (dieldrin, endosulfan, and chlordane) and organophosphate (chlorpyrifos and its oxon metabolite) pesticides were chronically dosed ex vivo (organotypic rat hippocampal slices) or in vivo (perinatal exposure in rats), and then biochemical, electrophysiological, behavioral, and proteomic studies were performed. All the pesticides tested caused prolonged activation of MAPK/ERK pathway in a concentration-dependent manner. Additionally, some of them impaired metabotropic glutamate receptor-dependent long-term depression (mGluR-LTD). In the case of the pesticide chlordane, the effect was attributed to chronic modulation of MAPK/ERK signaling. These synaptic alterations were reproduced following developmental in vivo exposure to chlordane and chlorpyrifos-oxon, and were also associated with prototypical behavioral phenotypes of NDD, including impaired motor development, increased anxiety, and social and memory deficits. Lastly, proteomic analysis revealed that these pesticides differentially regulate the expression of proteins in the hippocampus with pivotal roles in brain development and synaptic signaling, some of which are associated with NDD. Based on these results, we propose a novel mechanism of synaptic dysfunction, involving chronic overactivation of MAPK and impaired mGluR-LTD, shared by different pesticides which may have important implications for NDD. Graphical abstract
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Dieldrin reduces both GABA-A and NMDA receptor function in cerebellar granule cells, while CPO increases the ratio of GABA-A receptor-mediated to AMPA receptor-mediated currents in CA1 pyramidal neurons, shifting network activity toward inhibition.
“Dieldrin reduces both GABA-A and NMDA receptor function in cerebellar granule cells, while CPO increases the ratio of GABA-A receptor-mediated to AMPA receptor-mediated currents in CA1 pyramidal neurons, shifting network activity toward inhibition (Babot et al., 2007; López-Merino et al., 2022).”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredOrganochlorines such as chlordane, dieldrin, and endosulfan, as well as organophosphates such as chlorpyrifos and chlorpyrifos oxon, induce sustained ERK activation and disrupt mGluR-dependent LTD; for chlordane, pharmacological inhibition of ERK signaling rescues this plasticity deficit, supporting a causal relationship between receptor-linked ERK dysregulation and synaptic dysfunction.
“Organochlorines such as chlordane, dieldrin, and endosulfan, as well as organophosphates such as chlorpyrifos and chlorpyrifos oxon, induce sustained ERK activation and disrupt mGluR-dependent LTD; for chlordane, pharmacological inhibition of ERK signaling rescues this plasticity deficit, supporting a causal relationship between receptor-linked ERK dysregulation and synaptic dysfunction (López-Mer”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredEpigenetically mediated alterations converge directly on key intracellular pathways involved in synaptic plasticity and neuronal survival.
“These epigenetically mediated alterations converge directly on key intracellular pathways involved in synaptic plasticity and neuronal survival (López-Merino et al., 2022; Qiu et al., 2023).”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
The Introduction identifies Akt/mTOR and MAPK/ERK as intracellular pathways regulating synaptic plasticity, and the Results report increased ERK phosphorylation after chronic pesticide exposure. The Discussion mentions epigenetic defects only as a potential mechanism for disrupting brain development; it does not establish that epigenetic alterations directly affect those pathways or pathways involved in neuronal survival. (LLM, conf=0.87)
Experimental — accuracy not yet measuredCPO increased pupillary weight and prolonged the latency of the pupillary reflex, indicating delayed motor maturation.
“CPO increased pupillary weight and prolonged the latency of the pupillary reflex, indicating delayed motor maturation.”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
The Results section ('Perinatal pesticide exposure causes motor and cognitive deficits'; Fig. 5a–b) reports slightly increased pup weight at the highest CPO dose and a dose-dependent increase in righting-reflex latency, consistent with delayed motor development. It does not report pupillary weight or a pupillary reflex; those terms misidentify the measures. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe attenuation of mGluR-LTD induced by CPO and chlordane persisted into adulthood despite preserved basal synaptic transmission.
“Notably, the attenuation of mGluR-LTD induced by CPO and chlordane persisted into adulthood despite preserved basal synaptic transmission.”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
This selective impairment of synaptic plasticity translated into deficits in object familiarity memory and spatial orientation, with chlordane impairing spatial memory in a dose-dependent manner.
“This selective impairment of synaptic plasticity translated into deficits in object familiarity memory and spatial orientation, with chlordane impairing spatial memory in a dose-dependent manner (López-Merino et al., 2022).”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
Perinatal exposure to low doses of chlordane or chlorpyrifos oxon (CPO) caused abnormalities in motor and cognitive development in rats.
“Perinatal exposure to low doses of chlordane or chlorpyrifos oxon (CPO) caused abnormalities in motor and cognitive development in rats.”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
Postnatal exposure to DEHP induces sex-specific changes in hippocampal microRNA expression.
“Postnatal exposure to DEHP has been shown to induce sex-specific changes in hippocampal microRNA expression.”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
The Results sections report sex-specific hippocampal effects of perinatal exposure to chlordane and CPO, including changes in ERK phosphorylation and protein levels; no page numbers are available in our copy. Searches for DEHP, its full chemical name, and hippocampal microRNA changes found no passage addressing the claimed effect of postnatal DEHP exposure. (LLM, conf=0.75)
Experimental — accuracy not yet measuredPhthalates alter histone deacetylase expression and microRNA profiles, indicating disruption of neurodevelopmental programming at multiple regulatory levels.
“They alter histone deacetylase expression and microRNA profiles, indicating disruption of neurodevelopmental programming at multiple regulatory levels.”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
The Results section on developmental signaling networks reports protein-expression changes after exposure to the pesticides chlorpyrifos-oxon and chlordane, not phthalates. Searches for phthalates, histone deacetylases, and microRNA profiles found no passage in our copy addressing the attributed effects. (LLM, conf=0.76)
Experimental — accuracy not yet measuredDownregulation of miR-93 together with upregulation of TNFAIP1 promotes degradation of protein kinase CK2β, leading to inhibition of the Akt/CREB signaling pathway and neuronal cell death.
“In particular, downregulation of miR-93 together with upregulation of TNFAIP1 promotes degradation of protein kinase CK2β, leading to inhibition of the Akt/CREB signaling pathway and ultimately neuronal cell death.”
From Environmental endocrine disruptors at the synapse: mechanisms linking chemical exposure to cognitive and behavioral dysfunction (2026) · cites this paper as López-Merino et al., 2022
The Results section on mGluR-LTD signaling reports that chlordane and CPO blocked stimulus-induced Akt phosphorylation, but it does not connect this effect to miR-93, TNFAIP1, CK2β degradation, CREB, or neuronal cell death. Searches for the distinctive miR-93–TNFAIP1–CK2β mechanism found no passage addressing it in our copy. (LLM, conf=0.75)
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Cited by
Sorted by citations
Jocsak, G., Kiss, D. S., Alymbaeva, D., Diebald, A., Zsarnovszky, A., Heinzlmann, A., & Bartha, T. (2026) · Frontiers in Behavioral Neuroscience · doi:10.3389/fnbeh.2026.1821381 · Cited by 1 · see citing works
- Authors
- López-Merino, E., Cuartero, M. I., Esteban, J. A., & Briz, V.
- Affiliations
- Consejo Superior de Investigaciones Científicas (ES)
- Spanish National Centre for Cardiovascular Research (ES)
- Corresponding author
- Briz, Víctor
- Venue
- Cell Biology and Toxicology
- Published
- 2022-02-08
- Volume
- 39
- Issue
- 5
- Pages
- 2089-2111
- ISSN
- 0742-2091 (ISSN-L)
- 1573-6822
- PMC
- PMC10547633
- OpenAlex
- W4210868823
- Cited by
- 44
- References
- 5
- Citations by year
- 2026: 16 · 2025: 8 · 2024: 11 · 2023: 6 · 2022: 3
- FWCI
- 3.86
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Cell Biology and Toxicology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
- Funders
- H2020 Marie Skłodowska-Curie Actions (713366)
- Ministerio de Economía, Industria y Competitividad, Gobierno de España (PCIN-2016-095, IJCI-2015-25507)
- Ministerio de Ciencia, Innovación y Universidades (SAF2017-86983-R, PID2020-117651RB, FPU18/02838)
- Fundación Francisco Cobos (Eduardo Gallego postdoctoral fellowship)
- Centro de Biología Molecular Severo Ochoa
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Pesticide Exposure and Toxicity
- Life Sciences › Neuroscience › Developmental Neuroscience › Anesthesia and Neurotoxicity Research
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- neurodevelopmental disorders, developmental neurotoxicity, organochlorine pesticides, organophosphorus pesticides, chlordane, chlorpyrifos oxon, dieldrin, endosulfan, ERK signaling, metabotropic glutamate receptors, long-term depression, synaptic plasticity, hippocampus, anxiety, social dysfunction, memory impairment, motor development, proteomic profiling
- MeSH terms
- Animals, Chlordan, Chlorpyrifos, Female, Hippocampus, Humans, Neuronal Plasticity, Pesticides, Pregnancy, Proteomics, Rats, Neurodevelopmental Disorders
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