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Related Concept Videos

Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

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...
Disorders of the Nervous Tissue01:28

Disorders of the Nervous Tissue

Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
Homeostatic Imbalances:
Alzheimer's disease manifests as a gradual decline in memory and cognitive abilities, attributed to the buildup of amyloid plaques and neurofibrillary tangles in the brain.
Parkinson's disease arises from the...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Drug Toxicity: Risk factors01:24

Drug Toxicity: Risk factors

Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
Types of Toxins01:36

Types of Toxins

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.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...

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Viability Assays for Cells in Culture
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Published on: January 20, 2014

Developmental neurotoxicity: some old and new issues.

Gennaro Giordano1, Lucio G Costa

  • 1Department of Environmental and Occupational Health Sciences, University of Washington, 4225 Roosevelt Way NE, Suite 100, Seattle, WA 98105, USA.

ISRN Toxicology
|June 1, 2013
PubMed
Summary
This summary is machine-generated.

Many chemicals pose risks to the developing brain, potentially causing neurodevelopmental disorders and later-life neurodegenerative diseases. Early identification and improved testing are crucial for protecting children

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Area of Science:

  • Neuroscience
  • Toxicology
  • Developmental Biology

Background:

  • The developing central nervous system is uniquely susceptible to chemical injury.
  • Developmental neurotoxicants can cause immediate and long-term neurological harm.
  • Numerous chemicals are recognized or emerging threats to neurodevelopment.

Purpose of the Study:

  • To review established and emerging developmental neurotoxicants.
  • To discuss the potential for delayed neurotoxicity and contribution to neurodegenerative diseases.
  • To assess current developmental neurotoxicity testing guidelines and identify areas for improvement.

Main Methods:

  • Literature review and synthesis of existing research on developmental neurotoxicants.
  • Discussion of specific chemical classes: methylmercury, lead, PBDEs, and organophosphorus insecticides.
  • Analysis of the impact of early-life exposure on neurodevelopment and aging.

Main Results:

  • Methylmercury and lead are confirmed developmental neurotoxicants.
  • Polybrominated diphenyl ether flame retardants and organophosphorus insecticides are emerging concerns.
  • Developmental neurotoxicant exposure may lead to silent damage manifesting in adulthood, potentially contributing to Parkinson's and Alzheimer's diseases.

Conclusions:

  • Chemicals impacting early development pose significant risks for lifelong neurological health.
  • Current testing guidelines require enhancement, and alternative methods need validation.
  • Protecting the developing brain necessitates ongoing research and improved regulatory strategies.