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pubmed:abstractText |
Untreated diabetic (BB) rats exhibited compensatory intestinal growth which was associated with hyperplasia and was accompanied by an increase in unoccupied vitamin D receptors. Although vitamin D receptors were increased, low circulating 1,25-dihydroxy-vitamin D3 [1,25(OH)2D3] prevented amplification of the action of 1,25(OH)2D3, as evidenced by reductions in calbindin D-9K and alkaline phosphatase activity in the BB rat intestine compared to control. In the kidney, a lesser degree of compensatory growth was observed which was not associated with hyperplasia, and no significant effect of diabetes on vitamin D receptors or calbindin D-28K was observed. These studies suggest tissue-specific changes in 1,25(OH)2D3 metabolism during spontaneous diabetes which may be related to the hyperplasia which occurs during compensatory tissue growth.
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