Stimulatory and inhibitory effects of 5-HT(1A) receptors on adrenocorticotropic hormone and cortisol secretion in a teleost fish, the Arctic charr (Salvelinus alpinus).
The serotonin(1A) (5-HT(1A)) receptor agonist 8-hydroxy-2-(di-N-propylamino)tetralin (8-OH-DPAT) was administrated to juvenile Arctic charr either by intraperitoneal (i.p.) injections or through a permanent i.p. implanted catheter. 8-OH-DPAT induced an elevation of plasma cortisol in non-stressed fish (receiving the drug through a permanent i.p. catheter), whereas 8-OH-DPAT had the opposite effect when administrated through a standard i.p. injection, dampening the rise in cortisol induced by handling and injection, an effect which was most pronounced at low doses of 8-OH-DPAT. In both cases, plasma levels of adrenocorticotropic hormone followed the same general pattern as plasma cortisol. The results suggests that 5-HT(1A) receptors are involved in the regulation of hypothalamic-pituitary-interrenal axis activity in Arctic charr, but the effect of 5-HT(1A) stimulation seems to vary depending on the state of the fish.
Höglund
Erik
E
Department of Limnology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 20, 752 36 Uppsala, Sweden.
Balm
Paul H M
PH
Winberg
Svante
S
D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000324:Adrenocorticotropic Hormone / Q000097:blood* / Q000378:metabolism; D000818:Animals; D006854:Hydrocortisone / Q000097:blood* / Q000378:metabolism; D007030:Hypothalamo-Hypophyseal System / Q000187:drug effects / Q000378:metabolism*; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology; D009434:Neural Pathways / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism*; D010913:Pituitary-Adrenal System / Q000187:drug effects / Q000378:metabolism*; D011985:Receptors, Serotonin / Q000187:drug effects / Q000378:metabolism*; D044263:Receptors, Serotonin, 5-HT1; D012701:Serotonin / Q000378:metabolism*; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D013312:Stress, Physiological / Q000097:blood / Q000503:physiopathology; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology; D014337:Trout / Q000033:anatomy & histology / Q000378:metabolism*
D011985:Receptors, Serotonin; D044263:Receptors, Serotonin, 5-HT1; D017366:Serotonin Receptor Agonists; D012701:Serotonin; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D000324:Adrenocorticotropic Hormone; D006854:Hydrocortisone