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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Phase I Oxidative Reactions: Overview

Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
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Bioactivation and Tissue Toxicity

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...
Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
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Related Experiment Videos

CYP450 Network Shifts in MASLD/MASH: From Pathogenesis to Nutrition-Informed Modulation.

Sümeyye Koç1, Sude Toydemir2, Gökay Vardar3

  • 1Department of Nutrition Dietetics, Faculty of Health Sciences, Lokman Hekim University, Ankara, Türkiye; Department of Molecular Biology and Genetics, Faculty of Science, Boğaziçi University.

The Journal of Nutritional Biochemistry
|July 11, 2026
PubMed
Summary

Dietary factors significantly impact liver health in metabolic dysfunction-associated steatotic liver disease (MASLD) and metabolic dysfunction-associated steatohepatitis (MASH). Understanding how nutrition affects drug-metabolizing enzymes (CYP450) is crucial for managing these conditions.

Keywords:
CYP4MASHMASLDhigh-fat dietnutritionobesity

Related Experiment Videos

Area of Science:

  • Hepatology and Nutritional Science
  • Drug Metabolism and Xenobiotic Interactions
  • Molecular and Cellular Biology

Background:

  • Metabolic dysfunction-associated steatotic liver disease (MASLD) and metabolic dysfunction-associated steatohepatitis (MASH) are rising health concerns linked to obesity and poor diet.
  • Cytochrome P450 (CYP450) enzymes are critical for drug metabolism, lipid handling, and responding to nutritional and environmental exposures, but their role in MASLD/MASH is not fully understood from a nutritional perspective.

Purpose of the Study:

  • To review and integrate the current understanding of how diet-related exposures influence hepatic CYP450 pathways in the context of MASLD/MASH.
  • To map the relationships between dietary patterns, food contaminants, and bioactive compounds with CYP450 function in the metabolically compromised liver.

Main Methods:

  • A qualitative framework was used to review existing literature on nutrition-exposure-CYP relationships in MASLD/MASH.
  • Evidence from human tissue studies, animal models, in vitro experiments, and mechanistic studies was integrated.

Main Results:

  • Obesity, high-fat diets, fructose, and specific fatty acid compositions can alter hepatic CYP450 activity and expression, particularly CYP3A4, in MASLD/NASH.
  • Metabolic inflammation appears to promote pro-oxidant CYP pathways (e.g., CYP2E1) while potentially impairing detoxification pathways (e.g., CYP3A).
  • Food contaminants like nitrosamines and aflatoxin B1 may undergo CYP-dependent bioactivation, though human validation in MASLD/MASH is limited.

Conclusions:

  • Nutrition-related remodeling of CYP450 enzymes is a key interface linking diet, oxidative stress, xenobiotic handling, and MASLD/MASH progression.
  • Future research should combine dietary assessments with CYP activity measures, oxidative stress biomarkers, and gut-liver axis markers for a comprehensive understanding.