Abstract
Decapitation altered the pattern of in vitro protein synthesis by the fat body of adult female Blaberus discoidalis cockroaches. Several polypeptides showed marked diminution, whereas two polypeptides showed markedly increased synthesis. The polypeptide profile was restored to normal in decapitated cockroaches by treatment with the juvenile hormone analog (JHA) methoprene. Cloned cDNAs that were isolated represented two fat body transcripts: one transcript was strongly stimulated and the other strongly suppressed by JHA. JHA acted on fat bodies in vitro to modulate the levels of the two transcripts. These studies indicate a system where juvenile hormone may provoke vividly contrasting gene expressions in the same tissue at the same time.
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