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Toxic Reactions: Overview

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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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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
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Carbon monoxide - beyond toxicity?

D Stucki1, W Stahl1

  • 1Institute of Biochemistry and Molecular Biology I, University of Düsseldorf, Medical Faculty, Germany.

Toxicology Letters
|August 30, 2020
PubMed
Summary

Carbon monoxide (CO) acts as a signaling molecule, triggering cellular stress responses by modulating mitochondrial function and energy metabolism. Endogenous CO production, regulated by heme oxygenases (HOs), plays a key role in cellular defense mechanisms.

Keywords:
CORMscarbon monoxideelectrophilesheme oxygenasemitochondriarespirationstress response

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Toxicology

Background:

  • Carbon monoxide (CO) is a frequent cause of accidental poisoning, primarily known for inhibiting oxygen transport by binding to hemoglobin.
  • Emerging evidence highlights CO's role as a gaseous signaling molecule, similar to nitric oxide, capable of initiating cellular stress responses.
  • Endogenous CO is produced by heme oxygenases (HOs), with stress-inducible HO-1 and constitutively expressed HO-2 being key mammalian isoenzymes.

Purpose of the Study:

  • To explore the dual role of carbon monoxide (CO) as both a toxicant and a signaling molecule in cellular stress responses.
  • To elucidate the mechanisms by which CO influences cellular energy metabolism, mitochondrial function, and antioxidant defense pathways.
  • To understand the implications of endogenous CO production in cellular defense against electrophilic insults.

Main Methods:

  • Utilized CO-releasing molecules (CORMs) for controlled delivery of CO in biological systems.
  • Investigated the effects of CO on mitochondrial respiration, membrane potential, and ATP production.
  • Analyzed the impact of CO on glycolysis, the pentose phosphate pathway, and NADPH generation.
  • Examined the interplay between CO signaling, the Nrf2/Keap1 pathway, and the expression of phase I and phase II enzymes.

Main Results:

  • Low concentrations of CO induce moderate mitochondrial uncoupling via ion channel activation (PiC, ANT, BKCa), leading to a loss of mitochondrial membrane potential.
  • CO exposure inhibits mitochondrial respiration and increases reactive oxygen species (ROS) generation at high concentrations.
  • Cellular energy metabolism shifts towards increased glycolysis and pentose phosphate pathway utilization for NADPH production under CO exposure.
  • Endogenous CO production is linked to Nrf2-dependent cellular defense mechanisms, including glutathione synthesis, while inhibiting phase I enzymes like CYPs.

Conclusions:

  • Carbon monoxide (CO) functions as a critical regulator in cellular stress response, impacting energy metabolism and mitochondrial quality control.
  • CO's signaling role involves intricate modulation of mitochondrial pathways and antioxidant defenses, distinct from its toxic effects at high concentrations.
  • Understanding CO's endogenous production and signaling is crucial for developing therapeutic strategies against cellular stress and electrophilic insults.