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Regulation of plasma glucose and sulfate excretion in Pacific hagfish, Eptatretus stoutii is not mediated by 11-deoxycortisol
journal contribution
posted on 2017-06-01, 00:00 authored by A M Clifford, N R Bury, Aaron SchultzAaron Schultz, J D Ede, B L Goss, G G GossThe goal of this study was to identify whether Pacific hagfish (Eptatretus stoutii) possess glucocorticoid and mineralocorticoid responses and to examine the potential role(s) of four key steroids in these responses. Pacific hagfish were injected with varying amounts of cortisol, corticosterone or 11-deoxycorticosterone (DOC) using coconut oil implants and plasma glucose and gill total-ATPase activity were monitored as indices of glucocorticoid and mineralocorticoid responses. Furthermore, we also monitored plasma glucose and 11-deoxycortisol (11-DOC) levels following exhaustive stress (30 minutes of agitation) or following repeated infusion with SO42-. There were no changes in gill total-ATPase following implantation with any steroid, with only very small statistical increases in plasma glucose noted in hagfish implanted with either DOC (at 20 and 200 mg kg-1 at 7 and 4 days post-injection, respectively) or corticosterone (at 100 mg kg-1 at 7 days post-injection). Following exhaustive stress, hagfish displayed a large and sustained increase in plasma glucose. Repeated infusion of SO42- into hagfish caused increases in both plasma glucose levels and SO42- excretion rate suggesting a regulated glucocorticoid and mineralocorticoid response. However, animals under either condition did not show any significant increases in plasma 11-DOC concentrations. Our results suggest that while there are active glucocorticoid and mineralocorticoid responses in hagfish, 11-DOC does not appear to be involved and the identity and primary function of the steroid in hagfish remains to be elucidated.
History
Journal
General and comparative endocrinologyVolume
247Pagination
107 - 115Publisher
ElsevierLocation
Amsterdam, The NetherlandsISSN
0016-6480Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2017, ElsevierUsage metrics
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Keywords
Science & TechnologyLife Sciences & BiomedicineEndocrinology & MetabolismZoologyAgnathalonoregulationMineralocorticoidGlucocorticoidSteroid biosynthesisGlomerular filtration rateMYXINE-GLUTINOSA LSEA LAMPREYSTEROID-BIOSYNTHESISPETROMYZON-MARINUSPARAMYXINE-ATAMIEVOLUTIONARYVERTEBRATERECEPTORHORMONEGONADOTROPINIonoregulationPhysiologyZoology
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