Abstract

The endocrine regulation of the life of the insect is based on the ecdysteroids (ecdysone, 20-hydroxyecdysone), juvenile hormone (JH), and a myriad of neurosecretory peptide hormones, most of which have yet to be purified and sequenced. Ecdysteroids and JH control both growth and development and later reproductive maturation. The neurohormones regulate the release of these two hormones and also a variety of homeostatic activities and behav­ ior. The preceding review in this volume (47) discusses the regulation of the endocrine glands and the chemistry and metabolism of the hormones. This review is concerned with the hormonal regulation of physiological pro­ cesses. Since there have been many recent reviews of various aspects of insect endocrinology and insect hormone action (13, 26, 36,48, 50-52, 60, 99, 111, 112, 120) I concentrate here on a few systems that promise to better our understanding of the action of ecdysteroids and juvenile hormone at the cellular level, in both morphogenesis and reproduction. I then discuss the actions of two identified peptide hormones.

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