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Regulation of growth hormone (GH) receptor (GHR1 and GHR2) mRNA level by GH and metabolic hormones in primary cultured tilapia hepatocytes.

Abstract：

:Growth hormone (GH) regulates essential physiological functions in teleost fishes, including growth, metabolism, and osmoregulation. Recent studies have identified two clades of putative receptors for GH (GHR1 clade and GHR2 clade) in fishes, both of which are highly expressed in the liver. Moreover, the liver is an important target for the anabolic effects of GH via endocrine IGFs, and liver sensitivity to GH is modulated by metabolic hormones. We investigated the effects of GH, insulin, glucagon, cortisol and triiodothyronine on GHR1 and GHR2 mRNA levels in primary cultured tilapia hepatocytes. Physiological concentrations of GH strongly stimulated GHR2 mRNA level (0.5-50×10(-9) M), but did not affect GHR1 mRNA level. Insulin suppressed stimulation of GHR2 mRNA level by GH (10(-8)-10(-6) M). Insulin increased basal GHR1 mRNA level (10(-8)-10(-6) M). Cortisol increased basal GHR2 mRNA level (10(-7)-10(-6) M), but did not consistently affect GH-stimulated GHR2 mRNA level. Cortisol increased basal GHR1 mRNA level (10(-9)-10(-6) M). Glucagon suppressed GH-stimulated GHR2 mRNA level and increased basal GHR1 mRNA level at a supraphysiological concentration (10(-6) M). A single injection of GH (5 μg/g) increased liver GHR2 mRNA level, and insulin injection (5 μg/g) decreased both basal and GH-stimulated GHR2 mRNA levels after 6 h. In contrast, insulin and GH injection had little effect on liver GHR1 mRNA level. This study shows that GHR1 and GHR2 gene expression are differentially regulated by physiological levels of GH and insulin in tilapia primary hepatocytes.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Pierce AL,Breves JP,Moriyama S,Uchida K,Grau EG

doi

10.1016/j.ygcen.2012.07.010

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

22-9

issue

1

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(12)00284-5

journal_volume

179

pub_type

杂志文章

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