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Circadian regulation of synthesis of ecdysteroids by prothoracic glands of the insect Rhodnius prolixus: evidence of a dual oscillator system.

Abstract：

:Rhythmic synthesis of moulting hormones (ecdysteroids) by prothoracic glands (PGs) of the insect Rhodnius prolixus during the last larval instar was studied in vitro following explantations every 4-5 hr for up to 96 hr. Ecdysteroid synthesis was measured by radioimmunoassay as the quantity of ecdysteroid produced during 4 hr in vitro. A massive daily rhythm is seen, with synthesis at night being three- to fivefold higher than during the day. This rhythm of ecdysteroid synthesis by PGs free-runs in continuous darkness with a temperature-compensated period length close to 24 hr and is therefore controlled by a circadian system. This is the first report of circadian regulation of synthesis of an invertebrate hormone. The synthesis rhythm also free-runs in continuous light, but with an inverted phase and shorter period length. It is argued that the circadian system controlling synthesis comprises two oscillators which free-run in antiphase, occupy different anatomical locations, and are coupled by a humoral factor, possibly prothoracicotropic hormone. The ecdysteroid synthesis rhythm in PGs appears to drive the previously reported circadian rhythm in the haemolymph ecdysteroid titre. It is concluded that the circadian system controlling synthesis of ecdysteroids constitutes a pacemaker which drives various rhythms in the target cells of ecdysteroids via the rhythm in the haemolymph titre. Ecdysteroids are viewed as "hormonal Zeitgebers," imposing temporal order on development.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Vafopoulou X,Steel CG

doi

10.1016/0016-6480(91)90102-c

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

27-34

issue

1

eissn

0016-6480

issn

1095-6840

journal_volume

83

pub_type

杂志文章

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