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The effect of vitamin D on rat intestinal plasma membrane CA-pump mRNA

J M Zelinski1, D E Sykes, M M Weiser

  • 1Department of Medicine, State University of New York, Buffalo.

Biochemical and Biophysical Research Communications
|September 16, 1991
PubMed

Insights

Vitamin D influences rat intestinal calcium pump messenger RNA (mRNA) levels. Supplementation with 1,25-dihydroxyvitamin D3 increased Ca-pump mRNA, especially in differentiated villus cells.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Nutritional Science

Background:

  • Intestinal calcium absorption is crucial for bone health and is regulated by vitamin D.
  • The calcium pump (Ca-ATPase) plays a vital role in active calcium transport in the intestine.
  • Understanding the regulation of Ca-pump gene expression by vitamin D is essential.

Purpose of the Study:

  • To investigate the effect of vitamin D on the expression of rat intestinal Ca-pump mRNA.
  • To determine if vitamin D's effect on Ca-pump mRNA varies with enterocyte differentiation.

Main Methods:

  • RNA was extracted from rat intestinal cell fractions along the crypt-to-villus differentiation gradient.
  • Northern blot analysis was used to detect and quantify different sizes of Ca-pump mRNA.
  • Vitamin D-deficient rats were repleted with 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3).

Main Results:

  • Three distinct sizes of Ca-pump mRNA were identified in rat intestinal cells.
  • Vitamin D deficiency led to reduced levels of Ca-pump mRNAs.
  • Repletion with 1,25-(OH)2D3 significantly increased Ca-pump mRNA levels, particularly in villus cells.

Conclusions:

  • 1,25-dihydroxyvitamin D3 modulates the expression of enterocyte Ca-pump mRNA.
  • The effect of vitamin D on Ca-pump mRNA levels is partly dependent on the stage of enterocyte differentiation.
  • These findings contribute to understanding vitamin D's role in intestinal calcium homeostasis.

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