Effects of sex steroid hormones on the expression of somatostatin receptors sst1 and sst5 in goldfish pituitary and forebrain.
In the present paper the effects of estradiol and testosterone on the expression of the types 1 and 5 somatostatin receptors (sst1 and sst5) in the goldfish forebrain and pituitary were investigated. Estradiol increased the sst1 expression in both the forebrain and pituitary in a dose- and time-dependent manner. In addition, estradiol also increased the pituitary expression of sst5. On the other hand, testosterone had no effects on the expression of these receptor subtypes. Mature female goldfish were found to have higher sst1 and sst5 expression in the pituitary, as well as a higher expression of sst1 in the forebrain compared to sexually regressed animals. As estradiol treatment increases serum growth hormone levels in goldfish, these data suggest that sst1 and sst5 receptors are likely not directly involved in this aspect of growth hormone release.
Canosa
Luis Fabián
LF
Department of Biological Sciences, University of Alberta, Edmonton, Alta, Canada.
Lin
Xinwei
X
Peter
Richard E
RE
D000818:Animals; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D006054:Goldfish; D009693:Nucleic Acid Hybridization / Q000379:methods; D010759:Phosphorus Isotopes / Q000493:pharmacokinetics; D010902:Pituitary Gland / Q000187:drug effects* / Q000378:metabolism; D016548:Prosencephalon / Q000187:drug effects* / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D017481:Receptors, Somatostatin / Q000235:genetics / Q000378:metabolism*; D013739:Testosterone / Q000494:pharmacology*; D013997:Time Factors
D010759:Phosphorus Isotopes; D012333:RNA, Messenger; D017481:Receptors, Somatostatin; C101130:somatostatin receptor type 1; D013739:Testosterone; D004958:Estradiol; C094573:somatostatin receptor 5