Induction of tyrosine hydroxylase gene expression by bacteria in the fat body of eri-silkworm, Samia cynthia ricini

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
Kazuhiko HashimotoIsao Morishima

Abstract

A cDNA clone encoding tyrosine hydroxylase (TH) was isolated from larval fat body of immunized Samia cynthia ricini. In naive larvae, the TH gene was expressed only in the brain, but strongly induced in fat body and hemocytes after injecting UV-killed bacteria. The induction of the gene was rather short-lived compared to that of antibacterial protein genes, reaching the maximum levels 6h after bacterial challenge, and then quickly diminished. A strong induction of the gene expression was caused by both Gram-negative and positive bacteria and zymosan, but little if any by soluble peptidoglycan or lipopolysaccharide. A possible role of TH in the fat body of bacteria-challenged larvae would be to supply catecholamines as the substrate for phenoloxidase leading to melanization, working together with dopa decarboxylase.

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Citations

Jun 30, 2012·Science China. Life Sciences·Wei SunZe Zhang
Sep 9, 2010·Archives of Insect Biochemistry and Physiology·Se Hui HwangYong Chul Park

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