Cited by 2,944Neurogenesis and neuroplasticity mechanismsAnesthesia and Neurotoxicity ResearchPharmacological Effects and Toxicity Studies

Critical periods of vulnerability for the developing nervous system: evidence from humans and animal models.

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Rice, D, Barone, S·2000·Environmental Health Perspectives

Abstract

Vulnerable periods during the development of the nervous system are sensitive to environmental insults because they are dependent on the temporal and regional emergence of critical developmental processes (i.e., proliferation, migration, differentiation, synaptogenesis, myelination, and apoptosis). Evidence from numerous sources demonstrates that neural development extends from the embryonic period through adolescence. In general, the sequence of events is comparable among species, although the time scales are considerably different. Developmental exposure of animals or humans to numerous agents (e.g., X-ray irradiation, methylazoxymethanol, ethanol, lead, methyl mercury, or chlorpyrifos) demonstrates that interference with one or more of these developmental processes can lead to developmental neurotoxicity. Different behavioral domains (e.g., sensory, motor, and various cognitive functions) are subserved by different brain areas. Although there are important differences between the rodent and human brain, analogous structures can be identified. Moreover, the ontogeny of specific behaviors can be used to draw inferences regarding the maturation of specific brain structures or neural circuits in rodents and primates, including humans. Furthermore, various clinical disorders in humans (e.g., schizophrenia, dyslexia, epilepsy, and autism) may also be the result of interference with normal ontogeny of developmental processes in the nervous system. Of critical concern is the possibility that developmental exposure to neurotoxicants may result in an acceleration of age-related decline in function. This concern is compounded by the fact that developmental neurotoxicity that results in small effects can have a profound societal impact when amortized across the entire population and across the life span of humans.

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  • The number of neurons increases rapidly and peaks between week 13 and 16 of gestation in humans, specifically in the dorsal telencephalon.

    “By the time the apical radial glial progenitors within the prefrontal subdomains start dividing asymmetrically, the number of neurons will increase rapidly and peaks between week 13 and 16 of gestation in human (E10-E15 rodents/E43-E50 primates), specifically in the dorsal telencephalon [44–47].”

    From Development of prefrontal cortex (2022) · cites this paper as [47]

    The Proliferation discussion (pp. 514–515) describes rapid neocortical cell proliferation and region-specific timelines of neurogenesis. It does not state that neuron numbers peak at human gestational weeks 13–16, or locate such a peak specifically in the dorsal telencephalon; its explicit peak-proliferation range is GD 13–18 in rats. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Rodent exposures in early infancy (i.e., the neonatal period) mimic human 3rd trimester exposures for several organs, including the lung and brain.

    “This is based on developmental endpoints, since rodent exposures in early infancy (i.e., the neonatal period) mimic human 3rd trimester exposures for several organs, including the lung [50] and brain [51].”
  • The early postnatal window is critical to central nervous system development and equivalent to human third trimester brain development.

    “This window of exposure is critical to central nervous system development and equivalent to human 3rd trimester brain development [51].”
  • Developmental neurotoxicity (DNT) testing is particularly critical, as chemical-induced disruptions in neurogenesis, synaptogenesis, migration, or network formation during vulnerable developmental windows can cause lifelong neurological deficits.

    “Developmental neurotoxicity (DNT) testing is particularly critical, as chemical-induced disruptions in neurogenesis, synaptogenesis, migration, or network formation during vulnerable developmental windows can cause lifelong neurological deficits (Rice and Barone, 2000; Grandjean and Landrigan, 2014).”
  • These neurodevelopmental processes physiologically occur during the first and second trimester of pregnancy.

    “These neurodevelopmental processes physiologically occurs during the first and second trimester of pregnancy [231].”

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Authors
Rice, D., & Barone, S.
Affiliations
Environmental Protection Agency (US)
Venue
Environmental Health Perspectives
Published
2000-06-01
Volume
108
Issue
suppl 3
Pages
511-533
ISSN
  • 0091-6765 (ISSN-L)
  • 1552-9924
OpenAlex
W2120095635
Cited by
2,944
References
407
Citations by year
2026: 46 · 2025: 94 · 2024: 148 · 2023: 180 · 2022: 173 · 2021: 181 · 2020: 177 · 2019: 163 · 2018: 168 · 2017: 141 · 2016: 150 · 2015: 183 · 2014: 141 · 2013: 124 · 2012: 124
FWCI
1.77
Type
journal article
Language
en
Open access
Locations
  • Environmental Health Perspectives (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
U.S. Environmental Protection Agency
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Anesthesia and Neurotoxicity Research
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Pharmacological Effects and Toxicity Studies
Keywords
critical period, developmental neurotoxicity, brain development, neuronal proliferation, neuronal migration, neuronal differentiation, synaptogenesis, myelination, apoptosis, early life exposure, X-ray irradiation, methylazoxymethanol, ethanol, lead, methylmercury, chlorpyrifos, behavioral development, brain maturation, schizophrenia, dyslexia, epilepsy, autism spectrum disorder, age-related cognitive decline
MeSH terms
Adult, Aged, Aging, Animals, Cell Differentiation, Cell Movement, Child, Child, Preschool, Female, Embryonic and Fetal Development, Humans, Infant, Infant, Newborn, Middle Aged, Nervous System, Neuronal Plasticity, Neurotoxins, Pregnancy, Primates, Time Factors, Xenobiotics, Apoptosis, Mice, Rats

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