Temperature dependence of in vitro pituitary, testis, and thyroid secretion in a turtle, Pseudemys scripta

General and Comparative Endocrinology
P LichtS Pavgi

Abstract

In vitro culture was used to examine the direct actions of temperature at the level of pituitary hormone [luteinizing hormone (LH), thyrotropin (TSH), growth hormone (GH), prolactin (PRL)] responses to neuropeptides and two related peripheral endocrine responses [thyroid hormone (T4) and testicular androgen secretion] to pituitary hormones (TSH and gonadotropins) in a turtle, Pseudemys scripta. All these responses were fully suppressed at very low temperatures (5-6 degrees) and maximal near the species' preferred body temperature (28 degrees), but sensitivities differed markedly in intermediate ranges. At the pituitary level, the response of TSH, GH, and PRL to thyrotropin-releasing hormone (TRH) was considerably more temperature sensitive than the response of LH to gonadotropin-releasing hormone (GnRH) stimulation. TSH, GH, and PRL were unresponsive at 20 degrees or below, whereas LH secretion was stimulated almost equally between 12 and 28 degrees; the main effect of cooling on LH secretion was to reduce the duration of the response to GnRH. There was no clear effect of previous thermal history on temperature sensitivity of pituitary neuropeptide responsiveness although the general responsiveness of the gland was altered; how...Continue Reading

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Citations

Feb 17, 2001·General and Comparative Endocrinology·K A KohelV A Lance
Oct 12, 2001·Journal of Toxicology and Environmental Health. Part a·E Willingham
Mar 28, 2012·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Catherine A HadfieldRichard J Montali
Oct 23, 2012·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Kathleen E HuntRosalind M Rolland
Aug 5, 2008·Journal of Chemical Neuroanatomy·Jesús M LópezAgustín González
Nov 1, 1994·Developmental and Comparative Immunology·N J Nevid, A H Meier
Sep 15, 1994·The Journal of Experimental Zoology·P JeyasuriaA R Place

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