Circadian regulation of hemolymph and ovarian ecdysteroids during egg development in the insect Rhodnius prolixus (Hemiptera).

摘要: Abstract Ecdysteroids, classically studied as the molting hormones of insects, occur at lower levels in adult stage, but their source and significance physiology is debated. In Rhodnius prolixus, a blood meal initiates cycle egg development ecdysteroids appeared hemolymph within 1–2 h feeding. Systematic changes ecdysteroid titer then occurred during development. There was clear circadian rhythm throughout This first report an any female insect. Of various tissues examined vitro, only ovaries released ecdysteroids. The amounts were adequate to account for observed titers. Therefore, are primary, perhaps sole, Ovaries vitro showed content release that synchrony with rhythm, indicating ovarian drives seen hemolymph. Potential regulation discussed relation known rhythms prothoracicotropic hormone insulin-like peptides prospect itself by and/or clock also discussed.