Change of body height is regulated by thyroid hormone during metamorphosis in flatfishes and zebrafish.

Abstract:

:Flatfishes with more body height after metamorphosis should be better adapted to a benthic lifestyle. In this study, we quantified the changes in body height during metamorphosis in two flatfish species, Paralichthys olivaceus and Platichthys stellatus. The specific pattern of cell proliferation along the dorsal and ventral edge of the body to allow fast growth along the dorsal/ventral axis might be related to the change of body height. Thyroid hormone (T4 and T3) and its receptors showed distribution or gene expression patterns similar to those seen for the cell proliferation. 2-Mercapto-1-methylimidazole, an inhibitor of endogenous thyroid hormone synthesis, inhibited cell proliferation and decreased body height, suggesting that the change in body shape was dependent on the local concentration of thyroid hormone to induce cell proliferation. In addition, after treatment with 2-mercapto-1-methylimidazole, zebrafish larvae were also shown to develop a slimmer body shape. These findings enrich our knowledge of the role of thyroid hormone during flatfish metamorphosis, and the role of thyroid hormone during the change of body height during post-hatching development should help us to understand better the biology of metamorphosis in fishes.

journal_name

Gen Comp Endocrinol

authors

Xu J,Ke Z,Xia J,He F,Bao B

doi

10.1016/j.ygcen.2016.06.028

subject

Has Abstract

pub_date

2016-09-15 00:00:00

pages

9-16

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(16)30194-0

journal_volume

236

pub_type

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