Video Experimental Relacionado

Updated: Aug 15, 2026

Changes in Mammary Gland Morphology and Breast Cancer Risk in Rats
09:36

Changes in Mammary Gland Morphology and Breast Cancer Risk in Rats

Published on: October 16, 2010

La exposición de ratas recién nacidas a compuestos farmacológicamente activos puede alterar permanentemente el

R A Faris, T C Campbell

    Science (New York, N.Y.)
    |February 13, 1981
    PubMed
    Resumen

    La exposición perinatal al fenobarbital en ratas altera la actividad de las enzimas hepáticas y los adductos de aflatoxina B1 en los machos adultos, lo que sugiere una relación con el riesgo de cáncer.

    Más Videos Relacionados

    Using Caenorhabditis elegans for Studying Trans- and Multi-Generational Effects of Toxicants08:58

    Using Caenorhabditis elegans for Studying Trans- and Multi-Generational Effects of Toxicants

    Published on: July 29, 2019

    Preclinical Model of Prenatal Delta-9-Tetrahydrocannabinol Exposure to Assess Its Impact on Neurodevelopmental Outcomes05:13

    Preclinical Model of Prenatal Delta-9-Tetrahydrocannabinol Exposure to Assess Its Impact on Neurodevelopmental Outcomes

    Published on: February 28, 2025

    Videos de Conceptos Relacionados

    Teratogenicity01:07

    Teratogenicity

    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...
    Mutagenicity and Carcinogenicity01:25

    Mutagenicity and Carcinogenicity

    Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
    Factors Affecting Drug Biotransformation: Physicochemical and Chemical Properties of Drugs01:21

    Factors Affecting Drug Biotransformation: Physicochemical and Chemical Properties of Drugs

    A drug's physicochemical properties fundamentally influence its metabolism. For instance, a drug's molecular size and shape critically determine its interaction with enzymes and transporters — larger drugs may face difficulty reaching enzyme active sites, altering their metabolic pathways. The pKa of a drug, which establishes its ionization state, can impact its solubility and absorption, thereby influencing metabolism.
    The drug's acidity or basicity is essential in determining the metabolic...
    Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

    Pharmacokinetics in Pediatric Patients: Drug Metabolism

    In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses a challenge in...
    Pharmacogenetics of Drug Metabolism: Overview01:27

    Pharmacogenetics of Drug Metabolism: Overview

    Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...
    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...