Regulation of cytochrome P-450 dependent steroid hydroxylase activity in Manduca sexta: evidence for the involvement of a neuroendocrine-endocrine axis during larval-pupal development.

Abstract:

:Ecdysone 20-monooxygenase activity and the factors which may regulate this steroid hydroxylase were examined in the midgut of the tobacco hornworm, Manduca sexta, during the last larval stadium. Radioassay experiments revealed that midgut ecdysone 20-monooxygenase undergoes a single 50-fold increase in activity temporally coincident with the onset of the wandering stage. The increase in midgut monooxygenase activity was prevented by actinomycin D and cycloheximide, and could be elicited in head (but not thoracic) ligated animals by a brain-retrocerebral complex factor(s) released at the same time as prothoracicotropic hormone. In contrast, ecdysone or 20-hydroxyecdysone could elicit the increase in enzyme activity in both head and thoracic ligated animals. These data suggest the operation of a neuroendocrine-endocrine axis in the regulation of midgut ecdysone 20-monooxygenase activity.

authors

Keogh DP,Johnson RF,Smith SL

doi

10.1016/0006-291x(89)91090-5

subject

Has Abstract

pub_date

1989-11-30 00:00:00

pages

442-8

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(89)91090-5

journal_volume

165

pub_type

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