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Related Experiment Videos

Pineal physiology in microgravity: relation to rat gonadal function aboard Cosmos 1887.

D C Holley1, M R Soliman, F Kaddis

  • 1Department of Biological Sciences, San Jose State University, CA 95192-0100.

Aviation, Space, and Environmental Medicine
|October 1, 1991
PubMed
Summary

Spaceflight altered pineal gland serotonin turnover in male rats, potentially impacting melatonin secretion. This change may contribute to reduced testosterone levels and fewer spermatogonia cells observed in flight animals.

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Area of Science:

  • Space Biology
  • Endocrinology
  • Neuroscience

Background:

  • The pineal gland regulates melatonin, influencing circadian rhythms and reproductive functions.
  • Spaceflight is known to induce physiological changes, but its specific effects on the pineal gland and reproductive system require further investigation.

Purpose of the Study:

  • To investigate the impact of spaceflight on pineal gland biochemistry and its relationship with gonadal function in male rats.
  • To analyze melatonin, serotonin (5-HT), 5-hydroxyindole acetic acid (5-HIAA), and calcium levels in the pineal glands of space-flown rats.

Main Methods:

  • Analysis of pineal gland and plasma samples from male rats aboard Soviet Biosatellite #1887.
  • Measurement of melatonin, 5-HT, 5-HIAA, and calcium content in pineal glands.
Keywords:
NASA Experiment Number COS 1887-22

Related Experiment Videos

  • Assessment of plasma testosterone and spermatogonia development as indicators of gonadal function.

    • Main Results:

    • Pineal 5-HT and 5-HIAA levels were significantly higher in flight animals compared to ground controls.
    • Plasma melatonin levels did not differ significantly among flight, synchronous, and vivarium control groups.
    • Flight animals exhibited lower plasma testosterone and a reduction in spermatogonia cells.

    Conclusions:

    • Spaceflight appears to increase pineal 5-HT turnover, potentially leading to elevated melatonin secretion.
    • Altered pineal function and increased melatonin may contribute to the observed antigonadal effects of spaceflight, including reduced testosterone and spermatogenesis.