Changes in the role of the thyroid axis during metamorphosis of the Japanese eel,Anguilla japonica

2014 ◽  
Vol 321 (7) ◽  
pp. 357-364 ◽  
Author(s):  
Ryusuke Sudo ◽  
Akihiro Okamura ◽  
Mari Kuroki ◽  
Katsumi Tsukamoto
Keyword(s):  
Anguilla Japonica ◽  
Japanese Eel ◽  
Thyroid Axis

The effect of hypophysectomy and prolactin treatment on the osmotic water influx into the isolated gills of the Japanese eel (Anguilla japonica)

1977 ◽  
Vol 55 (5) ◽  
pp. 872-876 ◽  
Author(s):  
Mizuho Ogawa
Keyword(s):  
Fresh Water ◽  
Sea Water ◽  
Anguilla Japonica ◽  
Japanese Eel ◽  
Osmotic Permeability ◽  
Water Influx ◽  
In Vitro Technique ◽  
Osmotic Water

An in vitro technique has been used to measure the osmotic water influx into the isolated gills and the osmotic permeability of the gill surface of the Japanese eel, Anguilla japonica. Hypophysectomy increases both of these measurements. Prolactin injections decrease both osmotic water influx and osmotic permeability to water in both the intact and hypophysectomized eels in fresh water but produce no change in either of these parameters when the fish (either intact or hypophysectomized) are in sea water. The possible role of the pituitary (especially prolactin) in osmoregulation of fishes is discussed and considered in relation to the environmental calcium in sea water.

scholarly journals Cloning of the cDNA for thyroid stimulating hormone beta subunit and changes in activity of the pituitary-thyroid axis during silvering of the Japanese eel, Anguilla japonica

2004 ◽  
Vol 32 (1) ◽  
pp. 179-194 ◽  
Author(s):  
YS Han ◽  
IC Liao ◽  
WN Tzeng ◽  
JY Yu
Keyword(s):  
Genomic Dna ◽  
Thyroid Stimulating Hormone ◽  
Anguilla Japonica ◽  
Japanese Eel ◽  
Beta Subunit ◽  
Mature Peptide ◽  
Wild Female ◽  
Pituitary Thyroid Axis ◽  
In The Wild ◽  
Thyroid Axis

The purposes of this study were: (1) to clone the cDNA encoding pituitary thyroid-stimulating hormone beta subunit (TSH beta) of the Japanese eel, Anguilla japonica, together with its genomic DNA sequence, for phylogenetic analysis, and to study the regulation of the TSH beta gene expression in cultured pituitaries; and (2) to investigate the transcript levels of pituitary TSH beta mRNA and the serum thyroxine profiles at different stages of ovarian development before and during silvering in the wild female eels. The maturity of female eels was divided into four stages, juvenile, sub-adult, pre-silver, and silver, based on skin color and oocyte diameter. The genomic DNA of the TSH beta subunit contains two introns and three exons, and the TSH beta protein possesses a putative signal peptide of 20 amino acids and a mature peptide of 127 amino acids. The amino acid sequence identities of TSH beta mature peptide of Japanese eel compared with those of teleosts and other vertebrates are: European eel (98.4%), salmonids (60.6-61.3%), carps (52.0-56.7%), sturgeon (48.4%), and tetrapods (42.9-45.2%). In in vitro studies of the regulation of TSH beta mRNA it was found that thyrotropin-releasing hormone increased while thyroxine decreased its expression. RT-PCR and real-time quantitative PCR analysis showed that the transcript levels of TSH beta subunit increased during eel silvering. The serum thyroxine levels also increased in parallel with TSH beta mRNA expression during silvering, supporting the hypothesis that the hypothalamus-pituitary-thyroid axis is correlated to silvering in the wild female Japanese eels.

Isolation of two types of cDNA encoding growth hormone receptor-like genes in the Japanese eel, Anguilla japonica

2002 ◽  
Vol 68 (sup1) ◽  
pp. 959-960 ◽  
Author(s):  
YUICHI OZAKI ◽  
HARUHISA FUKADA ◽  
YUKINORI KAZETO ◽  
SHINJI ADACHI ◽  
AKIHIKO HARA ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Hormone Receptor ◽  
Growth Hormone Receptor ◽  
Anguilla Japonica ◽  
Japanese Eel

Correlation Between PTEN and VEGF Expressions During the Development of Gas Gland in Japanese Eel (Anguilla japonica) Stimulated by Exogenous Hypophyseal Factors

2010 ◽  
Vol 1 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Yi-Fan Chen ◽  
Shan-Ru Jeng ◽  
Ming-Chyuan Chen ◽  
Jin-Chywan Gwo ◽  
Yung-Sen Huang
Keyword(s):  
Anguilla Japonica ◽  
Japanese Eel ◽  
Gas Gland
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