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Types of Toxins01:36

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
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Published on: March 6, 2018

Pesticide toxicity and the developing brain.

Brenda Eskenazi1, Lisa G Rosas, Amy R Marks

  • 1Center for Children's Environmental Health Research, School of Public Health, University of California, Berkeley, CA 94704, USA. eskenazi@berkeley.edu

Basic & Clinical Pharmacology & Toxicology
|January 30, 2008
PubMed
Summary

Prenatal exposure to organochlorine pesticides like dichlorodiphenyltrichloroethane (DDT) and organophosphate pesticides is linked to adverse neurodevelopmental outcomes in children. Early life pesticide exposure can negatively impact cognitive and developmental trajectories.

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Area of Science:

  • Environmental Health
  • Neuroscience
  • Pediatrics

Background:

  • Organochlorine and organophosphate pesticides are widely used globally, leading to documented in utero and developmental exposure in children.
  • Animal studies indicate neurodevelopmental toxicity of these pesticides, but human data, especially from longitudinal studies, are limited.
  • Understanding the impact of early-life pesticide exposure on child neurodevelopment is crucial for public health.

Purpose of the Study:

  • To investigate the association between prenatal pesticide exposure and neurodevelopmental outcomes in a cohort of Mexican-American children.
  • To examine the relationship between maternal serum levels of dichlorodiphenyltrichloroethane (DDT) and dichlorodiphenyldichloroethylene (DDE) and child neurodevelopment.
  • To assess the impact of prenatal and postnatal organophosphate pesticide exposure on neurodevelopmental assessments and behavioral checklists.

Main Methods:

  • Longitudinal birth cohort study (CHAMACOS) of Mexican-American children in California's Salinas Valley.
  • Measurement of maternal serum DDT/DDE levels and urinary organophosphate metabolites during pregnancy and childhood.
  • Neurodevelopmental assessments using Brazelton Neonatal Assessment Scales and Bayley Scales of Infant Development (mental and psychomotor) at multiple time points.
  • Maternal reporting via the Child Behaviour Checklist.

Main Results:

  • A negative association was observed between prenatal dichlorodiphenyltrichloroethane (DDT) exposure and child mental development.
  • Prenatal organophosphate pesticide exposure showed adverse associations with mental development at 24 months.
  • Prenatal organophosphate pesticide exposure was also linked to pervasive developmental disorder diagnoses at 24 months.

Conclusions:

  • Prenatal exposure to specific organochlorine (DDT) and organophosphate pesticides may negatively impact children's neurodevelopment.
  • These findings highlight the potential risks of early-life pesticide exposure on cognitive and developmental trajectories.
  • Further research and public health interventions are warranted to mitigate the effects of pesticide exposure on child neurodevelopment.