当前位置： SCI文献检索 > GENERAL AND COMPARATIVE ENDOCRINOLOGY期刊下所有文献 > Growth hormone and insulin-like growth factor I of a Euryhaline fish Cottus kazika: cDNA cloning and expression after seawater acclimation.

Growth hormone and insulin-like growth factor I of a Euryhaline fish Cottus kazika: cDNA cloning and expression after seawater acclimation.

Abstract：

:The four-spine sculpin Cottus kazika is a euryhaline teleost, in which faster growth in seawater (SW) and freshwater (FW) has been reported. In this study, cDNA clones encoding growth hormone (GH) and insulin-like growth factor I (IGF-I) were isolated from this species to examine the involvement of the GH/IGF-I axis in osmotic adaptation. The amino acid sequence of GH predicted from cDNA was highly similar to those of other fish species, 92% to Sparus aurata, 67% to Paralichthys olivaceus, and 63% to Oncorhynchus keta. The predicted sequence of IGF-I was also exhibited high similarity to those of other fishes, 97% to Myxocephalus scorpius, 95% to P. olivaceus, and 81% to O. keta. Tissue distribution of GH and IGF-I mRNA in fish reared in FW and SW was examined by reverse transcription-polymerase chain reaction (RT-PCR). The GH mRNA was detected only in the pituitary gland. The major site of IGF-I mRNA expression was the liver while minor signals were detected in various tissues including the pituitary, gill, fin, heart, spleen, intestine, and kidney. The expression level of GH mRNA in the pituitary was not different between FW- and SW-reared fish. However, the level of IGF-I mRNA in the liver of SW-reared fish was significantly higher than that of FW-reared fish. These results suggest the possible involvement of hepatic IGF-I in SW adaptation of this species.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Inoue K,Iwatani H,Takei Y

doi

10.1016/s0016-6480(02)00650-0

keywords:

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

77-84

issue

1

eissn

0016-6480

issn

1095-6840

pii

S0016648002006500

journal_volume

131

pub_type

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