title: The effect of L-DOPA administration on thyrotropin (TSH) and thyrotropin releasing hormone (TRH) levels in serum in primary or pituitary hypothyroidism.
abstract: The effect of acute administration of L-DOPA on TSH and TRH levels in serum was studied in primary or pituitary hypothyroidism. TRH levels in serum fell and then returned to initial levels after L-DOPA administration in primary or pituitary hypothyroidism. TSH levels in serum fell and then returned to initial levels after L-DOPA administration in primary hypothyroidism. T4 and T3 levels in serum did not change after L-DOPA administration in primary or pituitary hypothyroidism. These data suggested that L-DOPA might act directly to hypothalamus.
mesh_terms: D006801:Humans; D007037:Hypothyroidism / Q000097:blood* / Q000209:etiology; D007980:Levodopa / Q000008:administration & dosage / Q000494:pharmacology*; D010900:Pituitary Diseases / Q000097:blood / Q000150:complications*; D013972:Thyrotropin / Q000097:blood*; D013973:Thyrotropin-Releasing Hormone / Q000097:blood*; D013974:Thyroxine / Q000097:blood; D014284:Triiodothyronine / Q000097:blood
chemical_list: D014284:Triiodothyronine; D007980:Levodopa; D013973:Thyrotropin-Releasing Hormone; D013972:Thyrotropin; D013974:Thyroxine