title: Stress hormone secretion is altered by central administration of intermedin/adrenomedullin-2.
abstract: Intermedin/Adrenomedullin-2 (IMD), a newly described peptide with structural homology to adrenomedullin (AM), is present in brain and pituitary gland and binds to the same receptors as AM and calcitonin gene-related peptide (CGRP). We hypothesized that IMD would exert actions similar to AM and CGRP and previously have demonstrated that indeed IMD, like AM and CGRP, increases sympathetic tone and inhibits feeding and drinking when administered centrally. Here, we extend those observations by demonstrating that like AM, IMD acts in brain to stimulate the secretions of prolactin (PRL) and adrenocorticotropin (ACTH) and to inhibit the secretion of growth hormone (GH) in conscious rats. In addition, in conscious rats, central administration of IMD results in increased plasma levels of oxytocin (OT) and vasopressin (AVP). The ability of IMD to activate the hypothalamo-pituitary-adrenal (HPA) axis can be blocked by intravenous pretreatment with the corticotropin releasing factor (CRF) antagonist, astressin. These results suggest that multiple members of the AM family of peptides may be involved in the cardiovascular, behavioral and neuroendocrine responses to stress.
authors.affiliation: Department of Pharmacological and Physiological Science, Saint Louis University, 1402 South Grand Boulevard, Saint Louis, MO 63104, USA. taylormm@slu.edu
authors.forename: Meghan M
authors.initials: MM
authors.lastname: Taylor
authors.forename: Willis K
authors.initials: WK
authors.lastname: Samson
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000378:metabolism; D053607:Adrenomedullin; D000818:Animals; D003346:Corticotropin-Releasing Hormone / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000494:pharmacology; D004195:Disease Models, Animal; D013006:Growth Hormone / Q000378:metabolism; D007030:Hypothalamo-Hypophyseal System / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D009479:Neuropeptides / Q000378:metabolism* / Q000494:pharmacology; D009490:Neurosecretory Systems / Q000187:drug effects / Q000378:metabolism*; D010121:Oxytocin / Q000378:metabolism; D010446:Peptide Fragments / Q000494:pharmacology; D010907:Pituitary Hormones / Q000378:metabolism*; D011388:Prolactin / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013312:Stress, Physiological / Q000378:metabolism* / Q000503:physiopathology; D014667:Vasopressins / Q000378:metabolism
chemical_list: C499411:Adm2 protein, rat; D009479:Neuropeptides; D010446:Peptide Fragments; D010907:Pituitary Hormones; D014667:Vasopressins; D053607:Adrenomedullin; C104416:astressin; D010121:Oxytocin; D000324:Adrenocorticotropic Hormone; D011388:Prolactin; D013006:Growth Hormone; D003346:Corticotropin-Releasing Hormone