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Related Experiment Videos

Circulating osteocalcin in rats is inversely responsive to changes in corticosterone.

P E Patterson-Buckendahl1, R E Grindeland, D C Shakes

  • 1Department of Radiology, University of California, San Francisco 94143.

The American Journal of Physiology
|May 1, 1988
PubMed
Summary

Spaceflight may cause bone loss due to excess corticosteroids. This study found that corticosterone, a steroid hormone, significantly decreased osteocalcin levels in rats, indicating reduced bone formation.

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Area of Science:

  • Endocrinology
  • Bone Biology
  • Space Medicine

Background:

  • Spaceflight is associated with decreased bone formation.
  • Corticosteroid excess is a potential cause, possibly due to environmental stressors.
  • Osteocalcin levels may reflect bone formation rate.

Purpose of the Study:

  • To investigate the relationship between corticosteroid excess and decreased serum osteocalcin.
  • To determine if environmental stimuli during spaceflight experiments impact osteocalcin levels via corticosteroids.

Main Methods:

  • Rats were administered corticosterone or exposed to environmental stressors.
  • Serum osteocalcin levels were measured over time.
  • Adrenalectomy was performed in some rats.

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Main Results:

  • Exogenous corticosterone caused a dose- and time-dependent decrease in serum osteocalcin.
  • Adrenalectomy led to a significant increase in osteocalcin.
  • Environmental stressors correlated negatively with osteocalcin and positively with corticosterone levels.

Conclusions:

  • Corticosteroids play a significant role in regulating serum osteocalcin levels.
  • Environmental factors in spaceflight experiments may contribute to bone loss through corticosteroid-mediated mechanisms.