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Increased erythrocyte calcium pump activity in a kindred with familial benign hypercalcaemia
N Escobales1, C A Fariñas, L Haddock
1Department of Physiology, University of Puerto Rico School of Medicine, San Juan 00936.
Insights
Familial benign hypercalcaemia (FBH) may stem from cellular calcium transport defects. This study found significantly higher calcium pump activity in FBH patients compared to normal subjects.
Area of Science:
- Biochemistry
- Genetics
- Endocrinology
Background:
- Familial benign hypercalcaemia (FBH) is a genetic disorder characterized by elevated serum calcium levels.
- The underlying mechanisms of FBH are not fully understood, but defects in calcium regulation are suspected.
Purpose of the Study:
- To investigate the hypothesis that a global defect in cellular calcium transport is critical in the development of FBH.
- To compare cellular calcium transport mechanisms between individuals with FBH and normal subjects.
Main Methods:
- Evaluation of nine hypercalcaemic patients from an FBH kindred.
- Comparison of cellular calcium pump activity between FBH patients and nine normal subjects.
Main Results:
- Calcium pump activity was significantly higher (28%, P < 0.005) in the FBH kindred compared to normal subjects.
- This suggests a potential alteration in cellular calcium handling in FBH.
Conclusions:
- Cellular calcium transport defects, specifically increased calcium pump activity, may play a role in the pathogenesis of familial benign hypercalcaemia.
- Further research into calcium pump function in target tissues is warranted to elucidate FBH development.
Abstract:
The hypothesis that a global defect in cellular calcium transport may be critical in the development of familial benign hypercalcaemia (FBH) was investigated. Nine hypercalcaemic patients from a kindred with FBH and nine normal subjects were evaluated. Our results indicate that calcium pump activity in the FBH kindred was significantly higher (28%, P < 0.005) when compared to normal subjects. These findings suggest that alterations in calcium pump activity in target tissues may play a role in the development of FBH.