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[Glucose-6-phosphate dehydrogenase in normal human thrombocytes and in ischemic heart disease]
Insights
Levels of glucose-6-phosphate dehydrogenase (G6PD) enzyme activity in blood platelets change significantly during myocardial infarction. G6PD activity patterns in thrombocytes can help differentiate between healthy individuals and those experiencing acute or post-myocardial infarction events.
Area of Science:
- Biochemistry
- Hematology
- Cardiology
Background:
- Glucose-6-phosphate dehydrogenase (G6PD) is a critical enzyme in red blood cells and platelets.
- Changes in enzyme activity can indicate metabolic stress or disease states.
- Thrombocytes play a role in cardiovascular health and disease.
Purpose of the Study:
- To investigate alterations in G6PD activity in thrombocytes during different stages of myocardial infarction.
- To compare G6PD enzyme profiles between healthy individuals and myocardial infarction patients.
- To assess the thermal stability of G6PD in thrombocytes.
Main Methods:
- Polyacrylamide gel disc electrophoresis was used to analyze G6PD isoenzymes in thrombocyte lysates.
- Enzyme activity was measured in healthy individuals, and patients in pre-infarction, acute, and post-infarction periods.
- Temperature-dependent activity and thermal stability of G6PD were evaluated.
Main Results:
- Healthy individuals showed two G6PD activity zones in thrombocytes.
- The number of G6PD zones increased to seven during the pre-infarction period and eleven during acute myocardial infarction.
- Three zones were observed in the post-infarction period.
- The temperature optimum for G6PD activity was approximately 50°C in all groups.
- G6PD activity decreased significantly after pre-incubation at 40°C and 60°C in both healthy and patient groups.
Conclusions:
- The number and pattern of G6PD isoenzymes in thrombocytes are altered during myocardial infarction.
- G6PD activity in thrombocytes may serve as a potential biomarker for myocardial infarction.
- The enzyme exhibits similar thermal characteristics in healthy and diseased states, suggesting conserved properties despite altered expression.
Abstract:
Two zones, exhibiting glucose-6-phosphate dehydrogenase (G6PD) activity, were identified in lysates of thrombocytes from healthy persons by means of polyacrylamide gel disc electrophoresis; amount of the zones was increased up to 7 during the preinfarction period and up to II within the acute period myocardial infarction, three zones were found at the postinfarction period. Temperature optimum of the enzyme activity from thrombocytes was near 50 degrees in both the healthy persons and in the patients with acute myocardial infarction. After preincubation of G6PD within 10 min at 40 degrees and 60 degrees the enzymatic activity was similarly decreased by (50-55% and 85-90%, respectively, in thrombocyte preparations from healthy persons and from the patients with myocardial infarction.