Abstract
Fasting suppresses functioning of the hypothalamic-pituitary-gonadal (HPG) axis by
mechanisms that are incompletely understood. In 2003, hypothalamic kisspeptin-Kiss1r
signaling was discovered to play a significant role in regulating the HPG axis. We
have recently shown that in adult male macaques, short-term fasting attenuates the
response of the HPG axis to an exogenous kisspeptin challenge. In the present study,
we explored the mechanism underlying this attenuated response by examining the modulation
of the hypothalamic expression of Kiss1 and Kiss1r under short-term fasting and normal feeding conditions in the adult male macaques.
Hypothalamic mRNA was extracted from normal fed (n=3) and 48-h fasted (n=3) monkeys.
Kiss1 , Kiss1r , and GnRH1 mRNA were quantified by reverse transcription followed by real-time polymerase chain
reaction. In addition, blood samples were collected for measurement of plasma concentrations
of glucose, cortisol, leptin, and testosterone. In contrast to fed animals, plasma
glucose, leptin, and testosterone levels decreased and cortisol levels increased in
fasted animals. The hypothalamic expression of Kiss1 and Kiss1r mRNA was significantly lower (p<0.05) in fasted monkeys compared to fed monkeys while
hypothalamic GnRH1 mRNA expression was comparable between the 2 groups. Thus, our results demonstrate
that expression of hypothalamic Kiss1 and Kiss1r decrease after a short-term fasting in monkeys. This decrease may contribute to the
suppression of the HPG axis during fasting conditions in primates. In addition, our
finding of lower expression of Kiss1r in fasted monkeys provides an explanation for the attenuation in the HPG axis response
to peripheral kisspeptin challenge during short-term fasting.
Key words
fasting - HPG axis - GnRH1 - Kiss1 - Kiss1r - testosterone - monkey
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Correspondence
Dr. M. Shahab
Reproductive Neuroendocrinology
Laboratory
Department of Animal Sciences
Faculty of Biological Sciences
Quaid-i-Azam University
Islamabad
Pakistan
Phone: +92/51/9064 3014
Fax: +92/51/2601 176
Email: Shahab@qau.edu.pk