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Cellular Ca2+ ATPase activity in diabetes mellitus
Abstract:
Basal and maximal Ca2+ ATPase activity was studied in erythrocytes of 29 healthy controls, 15 patients with insulin-dependent diabetes mellitus (IDDM) and 22 patients with non-insulin-dependent diabetes mellitus (NIDDM). Basal and maximal Ca2+ ATPase activity was significantly decreased in insulin-dependent diabetes mellitus (8.4 +/- 0.5 and 22.5 +/- 1.1 pmol/10(6) RBC/min) and non-insulin-dependent diabetes mellitus (7.3 +/- 1.0 and 18.6 +/- 1.8 pmol/10(6) RBC/min) compared to healthy controls (9.3 +/- 1.0 and 24.6 +/- 1.1 pmol/10(6) RBC/min). Maximal Ca2+ ATPase activity showed a significant correlation to systolic blood pressure in both insulin-dependent diabetes mellitus and non-insulin-dependent diabetes mellitus. There was no significant correlation of maximal Ca2+ ATPase activity to fasting serum glucose concentration and to HbA1 levels. Maximal Ca2+ ATPase activity was significantly correlated to creatinine clearance in non-insulin-dependent diabetes mellitus, but not in insulin-dependent diabetes mellitus. It is concluded that a decreased cellular Ca2+ ATPase activity may predispose to the development of hypertension in diabetes mellitus.
Insights
Calcium ATPase activity is reduced in both types of diabetes mellitus, potentially contributing to hypertension. This study examined erythrocyte Ca2+ ATPase activity in healthy individuals and patients with diabetes.
Area of Science:
- Biochemistry
- Endocrinology
- Cardiovascular Medicine
Background:
- Erythrocyte Ca2+ ATPase activity is crucial for calcium homeostasis.
- Diabetes mellitus is associated with cardiovascular complications, including hypertension.
- Alterations in cellular enzyme activity may underlie diabetic complications.
Purpose of the Study:
- To investigate basal and maximal Ca2+ ATPase activity in erythrocytes of patients with insulin-dependent diabetes mellitus (IDDM) and non-insulin-dependent diabetes mellitus (NIDDM).
- To explore correlations between Ca2+ ATPase activity and clinical parameters in diabetic patients.
Main Methods:
- Erythrocytes were isolated from healthy controls, IDDM patients, and NIDDM patients.
- Basal and maximal Ca2+ ATPase activity was measured using established biochemical assays.
- Statistical analyses were performed to compare groups and assess correlations.
Main Results:
- Both basal and maximal Ca2+ ATPase activity were significantly decreased in IDDM and NIDDM patients compared to healthy controls.
- Maximal Ca2+ ATPase activity correlated significantly with systolic blood pressure in both diabetic groups.
- No significant correlation was found between maximal Ca2+ ATPase activity and fasting serum glucose or HbA1 levels.
- Maximal Ca2+ ATPase activity correlated with creatinine clearance in NIDDM patients but not in IDDM patients.
Conclusions:
- Decreased erythrocyte Ca2+ ATPase activity is a characteristic finding in both IDDM and NIDDM.
- Reduced Ca2+ ATPase activity may be a predisposing factor for the development of hypertension in diabetes mellitus.
- Further research is warranted to elucidate the precise mechanisms linking Ca2+ ATPase dysfunction to diabetic hypertension.