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Vitamin D -- induced changes in the renal membrane ATPase system
Calcified Tissue Research
|June 2, 1975
Summary
Vitamin D deficiency lowers key enzyme activity in rat kidneys. Supplementation with vitamin D2 restores normal calcium- and magnesium-dependent ATPase function and ATP binding.
Area of Science:
- Biochemistry
- Nutritional Science
- Renal Physiology
Background:
- Vitamin D is crucial for calcium homeostasis.
- Its role in renal membrane enzyme function is not fully understood.
Purpose of the Study:
- To investigate the effect of vitamin D deficiency on Ca-dependent and Mg-dependent ATPase activity in rat renal membranes.
- To determine if vitamin D repletion can restore enzyme function.
Main Methods:
- Comparison of ATPase activity in renal membrane preparations from vitamin D-deficient and normal rats.
- Assessment of ATP binding capacity in deficient and repleted rats.
- Administration of vitamin D2 to deficient rats prior to sacrifice.
Main Results:
- Ca-dependent and Mg-dependent ATPase activity was significantly depressed in vitamin D-deficient rats.
- ATP binding by enzymes was also reduced in vitamin D deficiency.
- Vitamin D2 administration restored both ATPase activity and ATP binding to normal levels.
Conclusions:
- Vitamin D appears essential for maintaining normal Ca- and Mg-dependent ATPase activity in renal membranes.
- Vitamin D deficiency impairs renal enzyme function related to ATP binding and hydrolysis.