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Immunohistochemical localization of rhodanese
1Pharmacology-Toxicology Graduate Programme, College of Pharmacy, Washington State University, Pullman 99164-6510.
The Histochemical Journal
|April 1, 1990
Summary
Rhodanese, an enzyme crucial for cyanide detoxification, is concentrated in the liver, lungs, and kidneys, not the brain. This explains why the brain is vulnerable to cyanide toxicity despite low enzyme levels.
Area of Science:
- Biochemistry
- Toxicology
- Cell Biology
Background:
- The role of the rhodanese enzyme in cyanide detoxification is debated, particularly concerning its accessibility in peripheral circulation.
- Cyanide distribution to the brain poses a significant toxicity risk, potentially leading to severe neurological damage or death.
Purpose of the Study:
- To investigate the tissue distribution of rhodanese, focusing on potential major cyanide detoxification sites.
- To clarify rhodanese levels in specific brain regions and their correlation with cyanide toxicity.
Main Methods:
- Quantitative analysis of rhodanese activity across various tissue types.
- Comparative assessment of rhodanese distribution in liver, kidney, lung, and brain tissues.
Main Results:
- Rhodanese activity is highest in liver hepatocytes, lung bronchiolar epithelial cells, and kidney proximal tubule cells.
- Brain tissue exhibits low rhodanese activity compared to the liver and kidney.
- Within the brain, fibrous astrocytes in white matter show the highest rhodanese levels.
Conclusions:
- The liver, lungs, and kidneys are primary sites for rhodanese-mediated cyanide detoxification.
- Low rhodanese levels in the brain, particularly in areas outside white matter, render it susceptible to cyanide-induced damage.
- Cyanide toxicity may manifest in brain regions with insufficient rhodanese for detoxification.