Effect of vitamin A deficiency on oxalate uptake by rat intestinal brush border membrane vesicles (BBMV) and its contribution towards urolithiasis |
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| Authors: | S Sharma R Narula R Nath S K Thind |
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| Institution: | Department of Biochemistry, Postgraduate Institute of Medical Education and Research, Chandigarh, India. |
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| Abstract: | The intestinal uptake of 14C]oxalate, 14C]glyoxylate, and 14C]glycolate are studied in brush border membrane vesicles (BBMV) isolated from vitamin A-deficient and pair-fed control rats. The data obtained indicate that oxalate and its precursors are transported across the BBMV by passive diffusion. The intestinal uptake of glyoxylate and glycolate remains unaltered in vitamin A deficiency, while uptake rate of oxalate was significantly increased (p less than 0.01) in vitamin A-deficient rats as compared to pair-fed controls. In conclusion, the results indicate that vitamin A deficiency leads to hyperabsorption of oxalate through the gut. |
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