Biochemical and Biophysical Research Communications, Vol.342, No.4, 1077-1082, 2006
Molecular cloning of growth hormone from silver sea bream: Effects of abiotic and biotic stress on transcriptional and translational expression
The pituitary growth hormone (GH) gene of silver sea bream (Sparus sarba) was cloned and characterized and Found to be 615 base pairs encoding a protein of 204 amino acids. Using a bacterial expression system, recombinant protein was prepared and rabbit polyclonal antibody wits raised. Transcript and protein amounts of G H were measured in fish that were adapted to a range of salinities, acclimated to different temperatures, or undergoing a natural time course of Vibrio alginolyticus infection. Isoosmotic salinity (12 ppt) adaptation resulted in increased GH transcript and protein in comparison to freshwater (0 ppt) and seawater (33 ppt) adapted fish. It was also found that cold temperature (12 degrees C) acclimated sea bream had higher amounts of pituitary GH transcript and protein when compared to warm temperature (25 degrees C) acclimated fish. Finally, the amounts of GH transcript and protein were found to be rapidly downregulated from an early stage of disease. The results from the present study demonstrate how GH can be modulated during both abiotic and biotic stress in fish. (c) 2006 Elsevier Inc. All rights reserved.