title: Chronic exposure to short photoperiod inhibits free thyroxine index and plasma levels of TSH, T4, triiodothyronine (T3) and cholesterol in female Syrian hamsters.
abstract: 1. Chronic exposure of female Syrian hamsters (Mesocricetus auratus) for 9 weeks to a short photoperiod (10L:14D) depressed the pituitary-thyroid axis as indicated by a drop in circulating titers of thyroid stimulating hormone (TSH), thyroxine (T4), triiodothyronine (T3) and the free thyroxine index (FT4I) compared to animals maintained under long photoperiodic conditions (14L:10D). 2. Short day treatment also reduced plasma cholesterol levels. 3. Neither plasma triglycerides, glucose nor growth hormone (GH) levels differed between hamsters exposed to short or long daily photoperiods.
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D002784:Cholesterol / Q000097:blood; D006224:Cricetinae / Q000502:physiology*; D005260:Female; D008027:Light; D008647:Mesocricetus / Q000502:physiology*; D009929:Organ Size / Q000528:radiation effects; D010053:Ovary / Q000528:radiation effects; D010903:Pituitary Gland, Anterior / Q000528:radiation effects; D011863:Radioimmunoassay; D013972:Thyrotropin / Q000097:blood*; D013974:Thyroxine / Q000097:blood*; D014280:Triglycerides / Q000097:blood; D014284:Triiodothyronine / Q000097:blood*; D014599:Uterus / Q000528:radiation effects
chemical_list: D001786:Blood Glucose; D014280:Triglycerides; D014284:Triiodothyronine; D013972:Thyrotropin; D002784:Cholesterol; D013974:Thyroxine