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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...
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,...
Physical Properties of Amines01:26

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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: 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...

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Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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Published on: March 29, 2018

Melamine toxicity.

Carl G Skinner1, Jerry D Thomas, John D Osterloh

  • 1Department of Emergency Medicine, Madigan Army Medical Center, Tacoma, WA, USA. carl.g.skinner@us.army.mil

Journal of Medical Toxicology : Official Journal of the American College of Medical Toxicology
|March 3, 2010
PubMed
Summary
This summary is machine-generated.

Melamine contamination in infant formula can cause urinary stones in infants, even without cyanuric acid. Further research is needed for diagnosis and treatment of melamine exposure in infants.

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Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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17:28

Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation

Published on: June 17, 2015

Area of Science:

  • Food Safety
  • Toxicology
  • Pediatrics

Background:

  • Melamine, an industrial chemical, poses risks to infant health, as seen in formula contamination incidents.
  • Previous animal studies linked melamine and cyanuric acid to stone formation.
  • Limited human data exists on melamine toxicity, particularly in infants.

Purpose of the Study:

  • To investigate the health effects of melamine contamination in infant formula.
  • To understand the mechanism of melamine-induced stone formation in infants.
  • To highlight the need for improved diagnostic and treatment strategies for melamine exposure.

Main Methods:

  • Review of clinical data from infants exposed to melamine-contaminated formula.
  • Analysis of potential mechanisms for melamine-uric acid stone formation.
  • Evaluation of diagnostic challenges, including imaging and clinical signs.

Main Results:

  • Large doses of melamine alone can cause urinary stones in infants, potentially due to increased uric acid excretion.
  • Clinical signs in affected infants were nonspecific, and stones were not always detected by imaging.
  • The efficacy of urine alkalinization for treatment remains unproven.

Conclusions:

  • Melamine contamination presents a significant food safety concern for formula-fed infants.
  • Infants are susceptible to melamine-induced urolithiasis, even without co-ingestion of cyanuric acid.
  • Further research is crucial for effective diagnosis and management of melamine toxicity in infants.