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Related Experiment Videos

Calcitonin, zinc, and testicular function.

A B Chausmer1, C Chavez, R M Wain

  • 1Endocrinology and Metabolism Section, Medical Service, VA Medical Center, Bay Pines, FL 33504.

Metabolism: Clinical and Experimental
|August 1, 1989
PubMed
Summary

Calcitonin (CT) does not acutely affect testosterone synthesis in Leydig cells. However, CT influences zinc transport in the testis, suggesting a role in modulating cellular zinc metabolism.

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Area of Science:

  • Reproductive Endocrinology
  • Cellular Metabolism
  • Hormonal Regulation

Background:

  • Calcitonin (CT) presence on Leydig cells and its impact on testicular zinc (Zn) transport suggest a physiological link.
  • Previous studies indicate CT may decrease Zn transport kinetics in the testis.

Purpose of the Study:

  • To investigate the acute effects of human synthetic calcitonin (hCT) on testosterone (T) synthesis.
  • To evaluate the impact of hCT on transmembrane Zn transport in isolated Leydig cells.

Main Methods:

  • Isolated Leydig cells from intact and thyroparathyroldectomized (TPTX) rats were used.
  • A closed two-compartment model system measured transmembrane Zn transport.
  • Testosterone synthesis was assessed following stimulation with equine luteinizing hormone (LH).

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Main Results:

  • Calcitonin (42 µg/mL) did not affect basal or LH-stimulated testosterone synthesis in isolated Leydig cells.
  • Subcutaneous hCT pretreatment in TPTX rats significantly reduced the fractional influx coefficient for Zn transport (P < .02).
  • No significant changes were observed in the fractional efflux coefficient for Zn transport.

Conclusions:

  • Calcitonin (CT) does not exert an acute effect on testosterone synthesis in isolated Leydig cells.
  • CT appears to play a role in modulating transmembrane zinc transport in testicular Leydig cells.
  • Long-term alterations in zinc metabolism may be necessary for clinically significant Zn-dependent changes in testosterone synthesis.