| chronic prolactin, gonadal and thyroid hormone treatments in vivo alter levels of trh and muscarinic receptors in male and female rat tissues. | chronic subcutaneous administration of prolactin into female rats during proestrus led to a 20% (p less than 0.05) decrease in retinal and a 32% (n = 20; p less than 0.01) decrease in pituitary trh receptors as compared to controls. in parallel experiments prolactin treatment during diestrus failed to influence trh receptor levels in both tissues compared to vehicle-treated rats. intraperitoneal injections of triiodothyronine for 8 weeks resulted in a selective 41% increase (p less than 0.02) in ... | 1988 | 2840173 |