title: Gonadal ecdysteroidogenesis in arthropoda: occurrence and regulation.
abstract: Ecdysteroids are multifunctional hormones in male and female arthropods and are stored in oocytes for use during embryogenesis. Ecdysteroid biosynthesis and its hormonal regulation are demonstrated for insect gonads, but not for the gonads of other arthropods. The Y-organ in the cephalothorax of crustaceans and the integument of ticks are sources of secreted ecdysteroids in adults, as in earlier stages, but the tissue source is not known for adults in many arthropod groups. Ecdysteroid metabolism occurs in several tissues of adult arthropods. This review summarizes the evidence for ecdysteroid biosynthesis by gonads and its metabolism in adult arthropods and considers the apparent uniqueness of ecdysteroid hormones in arthropods, given the predominance of vertebrate-type steroids in sister invertebrate groups and vertebrates.
authors.affiliation: Department of Entomology, University of Georgia, Athens, Georgia 30602, USA. mrbrown@uga.edu
authors.forename: Mark R
authors.initials: MR
authors.lastname: Brown
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Sieglaff
authors.forename: Huw H
authors.initials: HH
authors.lastname: Rees
mesh_terms: D000818:Animals; D001181:Arthropods / Q000378:metabolism*; D026461:Ecdysteroids / Q000032:analysis / Q000096:biosynthesis*; D006066:Gonads / Q000033:anatomy & histology / Q000378:metabolism
chemical_list: D026461:Ecdysteroids