Allatotropin-Induced formation of inositol phosphates in the corpora allata of the moth, Manduca sexta

✍ Scribed by Jeff D. Reagan; Wilma H. Miller; Steven J. Kramer

• Book ID: 102747181
• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 571 KB
• Volume: 20
• Category: Article
• ISSN: 0739-4462
• DOI: 10.1002/arch.940200206

✦ Synopsis

Allatotropin (AT) is a 13 amino acid neuropeptide isolated from the tobacco hornworm, Manduca sexta, which stimulates the biosynthesis of juvenile hormone (JH) in adult females of this insect. In this paper we report that AT stimulates inositol phosphate formation in both female and male corpora allata (CA) of adult Manduca sexta. Furthermore, thapsigargin, a potent Ca2+-ATPase inhibitor, staurosporine, a potent inhibitor of protein kinases A and C, and 2,5-di-(tert-butyl)-7,4-hydroquinone (DBHQ), a potent inhibitor of liver micro-soma1 ATP-dependent Ca" sequestration, all stimulate JH biosynthesis without changing the basal level of inositol phosphates. These data suggest that AT activates an inositol 1,4,5-trisphosphate (IP3) pathway. Furthermore, increases in the free intracellular Ca" concentration in the CA stimulate JH biosynthesis.