title: Cyclic AMP in the thyroid of the rat fed prophylthiouracil: in vitro unresponsiveness to thyrotropin.
abstract: Fragments of thyroid from rats fed Purina +0.1% propylthiouracil were incubated in vitro and the concentration of cyclic AMP measured. The normal gland showed a 3-fold increase in cyclic AMP with 50 mU thyrotropin per ml or 10(-4) M prostaglandin E1; tissue from rats fed propylthiouracil for 10 days to 6 months responded to prostaglandin E1 but not to thyrotropin. Feeding Purina without propylthiouracil for 1 month after 5 months of goitrogen restored thyrotropin-responsiveness, as did, to a lesser extent, injection of triiodothyronine, 50 mug twice daily for 5 days.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D008297:Male; D011441:Propylthiouracil / Q000008:administration & dosage / Q000494:pharmacology*; D011458:Prostaglandins E / Q000494:pharmacology; D051381:Rats; D013961:Thyroid Gland / Q000187:drug effects / Q000378:metabolism*; D013972:Thyrotropin / Q000494:pharmacology*; D014284:Triiodothyronine / Q000494:pharmacology
chemical_list: D011458:Prostaglandins E; D014284:Triiodothyronine; D011441:Propylthiouracil; D013972:Thyrotropin; D000242:Cyclic AMP