Growth hormone attenuates branchial HSP70 expression in silver sea bream.
In this study the effects of growth hormone (GH) on silver sea bream branchial heat-shock protein 70 (HSP70) expression was investigated using in-vivo and in-vitro experiments. For in-vivo experiments, sea bream were administered recombinant bream GH or the GH secretagogue hexarelin. Pituitary levels of GH were unchanged in fish administered exogenous GH but decreased on hexarelin administration, in comparison with saline controls. Levels of HSP70 were measured using immunoanalysis and it was found that both GH and hexarelin administration caused a significant decrease in branchial HSP70 abundance. For in-vitro analysis, branchial filaments were exposed to a range of GH concentrations (1, 10, and 100 ng/ml) and it was found that HSP70 levels were significantly lowered in all cases. This study adds to the growing body of evidence surrounding the importance of hormones in regulating heat-shock protein expression in fish.
Deane
Eddie E
EE
Department of Biology, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China.
Woo
Norman Y S
NY
D000818:Animals; D001934:Branchial Region / Q000187:drug effects / Q000378:metabolism; D029941:Fish Proteins / Q000378:metabolism* / Q000494:pharmacology; D005880:Gills / Q000187:drug effects / Q000378:metabolism; D013006:Growth Hormone / Q000378:metabolism / Q000494:pharmacology*; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D009842:Oligopeptides / Q000494:pharmacology; D010902:Pituitary Gland / Q000378:metabolism; D011994:Recombinant Proteins / Q000494:pharmacology; D021541:Sea Bream / Q000378:metabolism*
D029941:Fish Proteins; D018840:HSP70 Heat-Shock Proteins; D009842:Oligopeptides; D011994:Recombinant Proteins; C086184:hexarelin; D013006:Growth Hormone
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