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Bioactivation and Tissue Toxicity01:25

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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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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.
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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...
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Proatherogenic effects of 4-hydroxynonenal.

Anne Nègre-Salvayre1, Sandra Garoby-Salom1, Audrey Swiader1

  • 1Inserm UMR-1048, France.

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|January 2, 2017
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Summary

4-hydroxy-2-nonenal (HNE), a product of fatty acid peroxidation, forms adducts in proteins, driving atherosclerosis progression. HNE accumulation in vascular cells causes dysfunction, inflammation, and apoptosis, increasing risks of athero-thrombotic events.

Keywords:
AdductsAngiogenesisApoptosisER stressHNEHNE-scavengersInflammationLipid peroxidationOxidative stressOxidized LDLProliferationProtein adduct

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Area of Science:

  • Biochemistry
  • Cardiovascular Biology
  • Oxidative Stress Research

Background:

  • 4-hydroxy-2-nonenal (HNE) is a reactive carbonyl compound formed from n-6 polyunsaturated fatty acid peroxidation.
  • HNE-protein adducts are implicated in cellular dysfunction and tissue damage within the vascular system.
  • Accumulation of HNE adducts contributes to the pathogenesis of atherosclerosis and related vascular diseases.

Purpose of the Study:

  • To elucidate the role of 4-hydroxy-2-nonenal (HNE) in the development and progression of atherosclerosis.
  • To investigate the mechanisms by which HNE adducts impact vascular cell function and plaque formation.
  • To understand the contribution of HNE to atherogenicity and the risk of athero-thrombotic events.

Main Methods:

  • Analysis of HNE-protein adduct formation in vascular cells and atherosclerotic lesions.
  • Investigating the effects of HNE on LDL metabolism and macrophage scavenger receptor pathways.
  • Examining the activation of transcription factors (Nrf2, NF-kappaB) by HNE.
  • Assessing the impact of HNE on signaling proteins, cell proliferation, angiogenesis, and apoptosis in smooth muscle cells.

Main Results:

  • HNE-apoB adducts promote oxidized LDL uptake by macrophages, leading to foam cell formation.
  • HNE modulates transcription factor activity, inducing hormetic, survival, inflammatory, or apoptotic cellular responses depending on concentration.
  • HNE modifies key signaling proteins (e.g., growth factor receptors, cell cycle proteins) and extracellular matrix components, altering smooth muscle cell behavior.
  • HNE adducts accumulate in atherosclerotic lesions, contributing to apoptosis of vascular cells and potentially destabilizing plaques.

Conclusions:

  • 4-hydroxy-2-nonenal (HNE) plays a critical role in atherosclerosis by promoting atherogenic LDL metabolism and inducing vascular cell dysfunction and apoptosis.
  • HNE-induced cellular changes, including altered signaling and inflammation, contribute to atherosclerotic plaque development and instability.
  • The accumulation of HNE adducts in advanced lesions highlights its significance in increasing the risk of athero-thrombotic events.