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Related Concept Videos

Peroxisomes01:30

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Phase I Oxidative Reactions: Overview01:19

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...
Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
Bioactivation and Tissue Toxicity01:25

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...

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Related Experiment Video

Updated: Jun 21, 2026

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
13:21

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps

Published on: August 18, 2012

Peroxynitrite detoxification and its biologic implications.

Madia Trujillo1, Gerardo Ferrer-Sueta, Rafael Radi

  • 1Departamento de Bioquímica, Universidad de la República, Montevideo, Uruguay.

Antioxidants & Redox Signaling
|May 27, 2008
PubMed
Summary

Peroxynitrite, a harmful oxidant, can be detoxified by natural enzymes like peroxiredoxins and selenium-containing glutathione peroxidase. Various compounds, including porphyrins and flavonoids, also reduce its toxicity, highlighting detoxification mechanisms for disease.

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Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
13:21

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps

Published on: August 18, 2012

Analytical Techniques for Assaying Nitric Oxide Bioactivity
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Analytical Techniques for Assaying Nitric Oxide Bioactivity

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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

Area of Science:

  • Biochemistry
  • Toxicology
  • Molecular Biology

Background:

  • Peroxynitrite is a cytotoxic oxidant implicated in disease pathogenesis.
  • Understanding its detoxification mechanisms is crucial for therapeutic strategies.
  • Natural and pharmacological pathways exist for peroxynitrite decomposition.

Purpose of the Study:

  • To review the known mechanisms of peroxynitrite detoxification.
  • To highlight the roles of enzymatic and non-enzymatic agents in reducing peroxynitrite toxicity.
  • To discuss the physiological and pharmacological relevance of these detoxification pathways.

Main Methods:

  • Literature review of peroxynitrite detoxification mechanisms.
  • Analysis of enzymatic pathways involving peroxiredoxins and glutathione peroxidases.
  • Evaluation of pharmacological agents like porphyrins, flavonoids, and nitroxides.

Main Results:

  • Peroxiredoxins and selenium-containing glutathione peroxidases catalyze peroxynitrite reduction.
  • Heme proteins, such as oxyhemoglobin, contribute to detoxification.
  • Pharmacological agents including manganese/iron porphyrins, glutathione peroxidase mimetics, flavonoids, nitroxides, and tyrosine-containing peptides demonstrate protective effects.

Conclusions:

  • Multiple biological systems and pharmacological agents can detoxify peroxynitrite.
  • Enzymatic pathways play a significant physiological role in managing peroxynitrite levels.
  • Further research into these detoxification mechanisms may lead to novel therapeutic interventions for diseases associated with oxidative stress.