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Related Experiment Videos

Glucocorticoids inhibit intestinal phosphate absorption in developing rabbits.

S M Borowitz1, G S Granrud

  • 1Department of Pediatrics, University of Virginia Health Sciences Center, Charlottesville, 22908.

The Journal of Nutrition
|June 1, 1992
PubMed
Summary

Glucocorticoids like methylprednisolone suppress intestinal phosphate absorption in young rabbits within 24 hours. This occurs by reducing the maximum transport capacity of sodium-coupled phosphate transporters.

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Area of Science:

  • Biochemistry
  • Physiology
  • Pharmacology

Background:

  • Chronic glucocorticoid therapy is linked to osteoporosis in children.
  • Glucocorticoids are known to suppress intestinal calcium absorption.
  • The impact of glucocorticoids on intestinal phosphate absorption remains largely uncharacterized.

Purpose of the Study:

  • To investigate the effects of glucocorticoids on intestinal phosphate transport.
  • To determine if methylprednisolone influences sodium-phosphate cotransport in the intestine.

Main Methods:

  • Suckling rabbits (4 weeks old) were administered methylprednisolone.
  • Phosphate transport was assessed in brush border membrane vesicles 24 hours post-injection.
  • Sodium-dependent phosphate cotransport kinetics (Vmax and Km) were analyzed.

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Main Results:

  • Methylprednisolone significantly reduced phosphate uptake in intestinal vesicles compared to controls.
  • The maximal transport capacity (Vmax) for sodium-dependent phosphate transport was decreased by methylprednisolone.
  • Transporter affinity for phosphate and sodium remained unchanged, indicating a decrease in transporter number or function.

Conclusions:

  • Methylprednisolone rapidly suppresses intestinal sodium-coupled phosphate transport.
  • This suppression is attributed to a decreased maximal transport capacity.
  • These findings highlight a potential mechanism contributing to bone health issues during glucocorticoid treatment.