Bovine pars tuberalis secretions release growth hormone from rat pars distalis of pituitary gland.

Unlabelled: The pituitary pars tuberalis (PT) is characterized by PT-specific secretory cells which have raised the possibility of an endocrine function for this portion of adenohypophysis.

Objective: To investigate the effect of the secretion of bovine PT cells into culture medium on growth hormone (GH) response of dispersed pars distalis (PD) cells of rats.

Methods And Results: 48-hour culture medium of all PT cells at 1 microg of protein concentration induced the greatest GH release from PD cells.

Involvement of beta-adrenoceptors in a central regulation of the ovarian progesterone release in rats.

Unlabelled: The intracerebroventricular (i.c.v.