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Haptoglobin phenotype and coronary artery collaterals in diabetic patients
Irit Hochberg1, Ariel Roguin, Eugenia Nikolsky
1Rappaport Faculty of Medicine, Technion-Israel of Technology, PO Box 9649, Haifa, Israel.
Insights
Haptoglobin phenotype is linked to coronary collateral circulation in diabetic patients. The Hp 2-1 phenotype is associated with better collateral formation, potentially improving outcomes for diabetic cardiovascular disease.
Area of Science:
- Cardiovascular Medicine
- Genetics
- Diabetology
Background:
- Diabetic patients exhibit varied susceptibility to cardiovascular disease, possibly due to genetic factors.
- Coronary artery collateral circulation significantly impacts myocardial infarction size and varies among individuals.
- A prior study linked haptoglobin gene polymorphism to diabetic vascular complications.
Purpose of the Study:
- To investigate the association between haptoglobin (Hp) phenotype and coronary collateral formation in diabetic patients.
- To determine if Hp phenotype influences the development of compensatory blood supply in coronary artery disease within a diabetic population.
Main Methods:
- Correlating Hp phenotypes (1-1, 2-1, 2-2) with the presence or absence of coronary collaterals via angiography.
- Studying 82 consecutive diabetic patients and 138 consecutive non-diabetic patients undergoing cardiac catheterization.
Main Results:
- Diabetic patients with the Hp 2-1 phenotype showed a higher likelihood of having coronary collaterals compared to those with Hp 2-2 (P=0.007).
- No significant correlation between Hp phenotypes and collateral presence was observed in non-diabetic patients.
- Hp phenotype is associated with coronary collateral development in diabetic patients with coronary artery disease.
Conclusions:
- Haptoglobin phenotype is linked to coronary collateral circulation development in diabetic patients.
- The Hp 2-2 phenotype may be associated with reduced compensatory mechanisms for coronary artery stenosis in diabetics, potentially indicating a worse prognosis.
Abstract:
Cross-cultural epidemiological studies of incident cardiovascular disease in the diabetic patient have demonstrated marked differences in susceptibility that may be due to a genetic factor. The coronary artery collateral circulation is the chief determinant of the size of a myocardial infarction and is highly variable between patients. We recently demonstrated that a functional allelic polymorphism in the haptoglobin gene is correlated with a number of diabetic vascular complications. We thus set out to test the hypothesis that haptoglobin phenotype is associated with collateral formation in the setting of diabetes. We correlated the Hp phenotype (1-1, 2-1 or 2-2) as determined by polyacrylamide electrophoresis with the presence or absence of coronary collaterals by angiography in 82 consecutive diabetic patients and 138 consecutive non-diabetic patients undergoing catheterization. We found that diabetic patients with the Hp phenotype 2-1 were more likely to have collaterals than diabetic patients with the Hp phenotype 2-2 (P=0.007). There was no correlation between Hp phenotypes and the presence of collaterals in non-diabetic patients. Hp phenotype thus appears to be associated with the development of the coronary collateral circulation in diabetic patients with coronary artery disease. Haptoglobin 2-2 may predispose to less compensation for coronary artery stenosis in diabetic patients, and thereby portend a worse prognosis.