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Abstract
Abstract Evidence is presented for a neurohormone that stimulated by fivefold the synthesis of cytochromes aa 3 + b in the fat body of young, adult, male Blaberus discoidalis cockroaches. This newly discovered agent is designated as the “cytochromogenic factor” (CGF). CGF was concentrated in the corpora cardiaca (CC). A CGF bioassay was developed with decapitated animals that had a threshold response at 0.01 CC pair and showed a linear dose response up to a maximum of 0.08 CC pair. A 24- to 48-hr latent period was needed for the maximum in vivo response to CGF. CGF activity was heat labile and was inactivated by chymotrypsin; partially inactivated by carboxypeptidases A and Y and aminopeptidase M; but not by trypsin. Other hormones such as juvenile hormone (III), 20-hydroxyecdysone, proctolin, and triiodothyronine failed to elicit the cytochromogenic response.
Published Version
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