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Related Concept Videos

Teratogenicity01:07

Teratogenicity

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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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Types of Toxins01:36

Types of Toxins

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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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Environmental pollutants like...
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Toxic Reactions: Overview01:26

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

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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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Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

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Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
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Updated: Apr 6, 2026

Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants

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Prenatal Programming and Toxicity (PPTOX) Introduction.

Linda S Birnbaum1, Mark F Miller1

  • 1National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709.

Endocrinology
|August 5, 2015
PubMed
Summary
This summary is machine-generated.

Early-life exposures, including prenatal, significantly impact lifelong health. Understanding prenatal programming and toxicity is crucial for preventing future noncommunicable diseases.

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Area of Science:

  • Developmental biology
  • Environmental health
  • Epigenetics

Background:

  • The developmental origin of health and disease (DOHaD) hypothesis links early-life exposures to lifelong health outcomes.
  • Decades of research show nutrition, chemicals, and stress affect prenatal development and toxicity.
  • Emerging evidence connects low-level environmental exposures to noncommunicable diseases later in life.

Purpose of the Study:

  • To review the scientific understanding of early-life exposures and their impact on health across the lifespan.
  • To highlight the role of genomics and epigenetics in understanding these links.
  • To advocate for translating scientific knowledge into public health action.

Main Methods:

  • Epidemiological studies
  • Mechanistic research
  • Genomic and epigenetic analyses
  • Review of existing literature

Main Results:

  • Robust data confirm early-life exposures influence long-term disease risk.
  • Genomics and epigenetics reveal strong associations between low-level exposures and noncommunicable diseases.
  • Identified links to cardiovascular disease, obesity, diabetes, neurodevelopmental disorders, and cancer.

Conclusions:

  • Prenatal programming and toxicity are critical determinants of health across the lifespan.
  • Translating DOHaD research into practice requires interdisciplinary collaboration.
  • Engaging communities, industry, policymakers, and clinicians is essential for improving health outcomes.