Effects of bovine TSH on the tissue thyroxine level and metamorphosis in prometamorphic flounder larvae.

Abstract:

:Bovine thyroid-stimulating hormone (TSH) was microinjected (0.2 microliter/fish) into prometamorphic flounder larvae and the effects on metamorphosis as well as the tissue thyroxine (T4) and triiodothyronine (T3) levels were studied. After a single injection of TSH (5 mIU/g), the tissue T4 concentration increased markedly after 5 hr, reached a peak after 10 hr, and decreased subsequently. T4 concentration after 24 hr was still higher than in saline-injected fish but returned to the control level 48 hr after the injection. On the other hand, tissue T3 concentration was kept lower than the detectable level (0.2 ng/g) throughout the experimental period of 72 hr after a single injection of TSH (5 mIU/g). TSH treatment also accelerated the process of metamorphic climax, such as shortening of the second fin ray and eye migration. These results suggest that an increased secretion of TSH from the pituitary stimulates the thyroid, resulting in a surge of the tissue T4 concentration which induces the climax of the flounder larvae.

journal_name

Gen Comp Endocrinol

authors

Inui Y,Tagawa M,Miwa S,Hirano T

doi

10.1016/s0016-6480(89)80038-3

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

406-10

issue

3

eissn

0016-6480

issn

1095-6840

journal_volume

74

pub_type

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