期刊
ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY
卷 69, 期 3, 页码 143-154出版社
WILEY
DOI: 10.1002/arch.20268
关键词
Samia cynthia ricini; Bombyx mori; juvenile hormone; juvenile hormone acid methyl transferase 3-hydroxy-3-methylglutaryl CoA reductase
资金
- Hundred Talent Project [30470221, 30770271, KSCX-YW-N-009, 2006AA10A119, 2006CB943902, 2007CB947100, 2007AA10Z55, 07pj14100]
During the period of adult emergence in the Eii silkworm, Samia cynthia ricini, the corpora allata (CA) are apparently reactivated in females, but not males. This creates a significant sexual dimorphism in juvenile hormone(JH) synthesis by CA. To determine the underlying molecular mechanisms in this process, we cloned cDNAs of two enzymes involved in the JH synthesis pathway: 3-hydroxy-3-methylglutaryl CoA reductase (HMGR) and juvenile hormone acid methyl transferase (JHAMT). Both Samcri-HMGR and -JHAMT mRNAs were defected in CA almost exclusively. However, their expression patterns were different from each other. During the period of adult emergence, Samcri-HMGR was expressed in CA at a constantly high level suggesting it plays little role for the regulation of JH synthesis. In contrast, the patterns of both Samcri-JHAMT mRNA level and enzyme activity were closely correlated with the patterns of JH synthesis, CA reactivation, and sexual dimorphism of JH synthesis. In addition, JHAMT mRNA levels were paralleled JH synthesis in the fifth-instar larvae of S. cynthia ricini and the pharate adults of the silkworm Bombyx mori. We infer from these results that JHAMT is a key regulatory enzyme for JH synthesis in the Eii silkworm. Arch. Insect Biochem. Physiol. 69:143-154, 2008. (C) 2008 Wiley-Liss, Inc.
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