PMID: 6406633May 1, 1983Paper

Interrelationship between pituitary-testicular axis activity and raised environmental temperature in the rat

The Journal of Endocrinology
Z Chap, E Bedrak

Abstract

The relationship between the testes and the adenohypophysis in rats exposed to heat was assessed by (1) the determination of adenohypophysial concentrations of FSH, LH and prolactin as well as serum levels of prolactin and testosterone in rats maintained at 35 degrees C for various periods of time and (2) the elucidation of the responsiveness to stimulation with gonadotrophin releasing hormone (GnRH) or human chorionic gonadotrophin (hCG) of the rat acclimatized for 40 days to a temperature of 35 degrees C. The results demonstrated that while heat exposure caused a transient change in the concentration of FSH and LH in the adenohypophysis, the level of prolactin increased by twofold within 24 h and remained significantly higher than in control animals. A concurrent significant decrease in the concentrations of prolactin and testosterone in the serum of rats exposed to heat was also observed. Challenging the rat with exogenous GnRH resulted in a significant increase in serum LH and FSH concentrations in control rats and rats exposed to heat, but the magnitude of the rise in LH was greater in the latter group. However, this phenomenon was not accompanied by a rise in serum testosterone concentration in the rat exposed to heat. Ch...Continue Reading

Citations

May 1, 1990·Physiology & Behavior·C J Gordon
May 9, 2012·Anatomy Research International·Kamal Sarma, J Devi
Sep 8, 2007·International Journal of Andrology·B KurowickaG Kotwica

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