A diurnal rhythm in melanocyte-stimulating hormone content of the rat pituitary gland and its independence from the pineal gland.

@article{Tilders1975ADR,
  title={A diurnal rhythm in melanocyte-stimulating hormone content of the rat pituitary gland and its independence from the pineal gland.},
  author={Fred J. H. Tilders and P. G. Smelik},
  journal={Neuroendocrinology},
  year={1975},
  volume={17 4},
  pages={296-308}
}
Resting pituitary melanocyte-stimulating hormone (MSH) content was studied in adult rats kept under a controlled 14 h light-10 h dark regimen. A diurnal rhythm was found in pituitary MSH levels, showing peak values at 4.00-6.00 p.m., and low values during darkness and the beginning of the light period. The normally occurring fall in pituitary MSH content between 6.00 p.m. and midnight was also found in rats exposed to a prolonged photoperiod. Sympathetic denervation of the pineal gland by… CONTINUE READING