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Altered platelet lipoxygenase activity in patients with low selenium
1Department of Surgery, University of Otago, Dunedin, New Zealand.
Clinical Science (London, England : 1979)
|November 1, 1987
Summary
Low selenium status impairs arachidonic acid metabolism in platelets, linked to reduced glutathione peroxidase activity. This impacts crucial biochemical pathways in individuals with selenium deficiency.
Area of Science:
- Biochemistry
- Human Physiology
- Nutritional Science
Background:
- Selenium (Se) is an essential trace element crucial for various physiological functions.
- Glutathione peroxidase (GSHPx) is a key selenoenzyme involved in antioxidant defense.
- Platelet function and arachidonic acid metabolism are vital for hemostasis and inflammation.
Purpose of the Study:
- To investigate the impact of selenium nutritional status on arachidonic acid metabolism in human platelets.
- To compare platelet function and biochemical markers between individuals with low and normal selenium levels.
Main Methods:
- Recruited patients with low and normal selenium (Se) status.
- Measured plasma and whole blood Se levels.
- Assessed plasma, whole blood, and platelet glutathione peroxidase (GSHPx) activity.
- Studied [14C]arachidonic acid metabolism in stimulated platelets.
Main Results:
- Patients with low Se status exhibited significantly lower plasma and whole blood Se levels.
- Platelet GSHPx activity was markedly reduced in the low Se group.
- Reduced conversion of 12-hydroperoxyeicosatetraenoic acid to 12-hydroxyeicosatetraenoic acid was observed in low Se individuals.
Conclusions:
- Reduced activity of the selenoenzyme GSHPx is implicated in altered arachidonic acid metabolism in selenium deficiency.
- Platelet arachidonic acid metabolism is sensitive to selenium nutritional status.
- Further research may be needed to exclude the influence of other contributing factors.