NDLI: Profiles of thyrotropin, thyroid hormones, follicular cells and type I deiodinase gene expression during ontogenetic development of tilapia larvae and juveniles

Content Provider	Springer Nature Link
Author	Hsu, Chih Wei Tsai, Shu Chuan Shen, Shu Chane Wu, Su Mei
Copyright Year	2014
Abstract	The aims of the present study are to determine whether triiodothyronine (T3) and/or thyroxine (T4) in tilapia larvae is gifted through the mother, and to investigate the change profiles of thyrotropin (TSH), thyroid follicular cells and type I deiodinase (D1) gene expression following larval development. T3 and T4 contents were measured using radioimmunoassay, thyrotropin was observed using immunocytochemistry, and the D1 gene was cloned and measured using real-time PCR. Results indicated that the β-TSH-immunoreactive cells (thyrotropin ICC) signals were detected at 9 dph (i.e., 9 days of post-hatching). Thyroid follicular cells were observed first at 3 dph, while the T3 contents of the whole body gradually decreased before 11 dph. T4 contents were detected until 13 dph, with higher secretion during 19–21 dph. In addition, the T3 synthesis was not inhibited by thiourea (TU) before 13 dph, but the TU response in the larvae appeared after 13 dph. Type I deiodinase (D1: GenBank accession number KC591724) was found to contain 2444 bases and encoded 248 amino acids. The D1 mRNA expression began to increase at 13 dph, with a higher expression during 15–19 dph. These results suggested that the T3 contents were maternally derived before 13 dph. Both thyroid hormonal changes and some parameters related to thyroid hormone synthesis in ontogenetic tilapia are discussed.
Starting Page	1587
Ending Page	1599
Page Count	13
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	40
Issue Number	5
e-ISSN	15735168
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-06-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thyroid hormone Tilapia TSH Deiodinase Thiourea Freshwater & Marine Ecology Animal Physiology Animal Anatomy / Morphology / Histology Animal Biochemistry Zoology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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