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Seasonal and estradiol-17β-stimulated changes in thyroid function of adult Geotria australis, a southern hemisphere lamprey.

Abstract：

:Measurable in vitro hepatic monodeiodinase activity of the southern hemisphere lamprey, Geotria australis, was present only during the first 5 of the 16 month upstream spawning migration of this species. The production of T3 from T4 in vitro was pH-sensitive, and exhibited typical Michaelis-Menton kinetics. No consistent differences in the serum T4 concentrations were found in animals sampled at different times during the period of their residence in fresh water. However, serum T3 concentrations underwent a progressive decline during this period. Estradiol-17β (E2), administered as a suspension in hydrogenated coconut oil, induced a lowering of serum T4 concentrations and a rise in serum T3:T4 ratios, but had no measureable effect on liver size and serum concentrations of total calcium and protein. In the males, E2 induced the production of a small amount of a serum protein assumed to be vitellogenin, but there was no conspicuous increase in the amount of the same protein in females. This response to E2-challenge parallels more closely that of cyprinids than that of salmonids.

journal_name

Fish Physiol Biochem

journal_title

Fish physiology and biochemistry

authors

Leatherland JF,Macey DJ,Hilliard RW,Leatherland A,Potter IC

doi

10.1007/BF00003372

subject

Has Abstract

pub_date

1990-09-01 00:00:00

pages

409-17

issue

5

eissn

0920-1742

issn

1573-5168

journal_volume

8

pub_type

杂志文章

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