title: Anti-proliferative effect of 20-hydroxyecdysone in a lepidopteran cell line.
abstract: Ecdysteroids are steroid hormones involved in the epidermal growth of arthropods, controlling cell proliferation and further differentiation of target cells. The epidermal cell line IAL-PID2, established from imaginal discs of the Indian meal moth Plodia interpunctella kept its sensitivity to ecdysteroids in vitro, cells being able to respond to them by cytological and biochemical changes. When added to the culture medium, 20-hydroxyecdysone (20E) stopped cell proliferation and induced formation of epithelial-like aggregates. In order to better understand the cellular sequence of ecdysteroids signalling in epidermal cells we used the IAL-PID2 cell line for in vitro investigations of cytological events induced by the moulting hormone. After a 40 h serum deprivation, formazan assay (XTT) was routinely used to evaluate anti-proliferative effects of 20E during cell cycle. We established a more precise timing of the period of cell sensitivity to the hormone during the cell cycle, by the use of the mitotic index and the BrdU incorporation test. These in vitro assays were performed in parallel with the description of some hormone dependant cytological events, using immunofluorescent labelling with anti-beta tubulin/FITC antibodies and DNA staining.
authors.affiliation: Laboratoire de Physiologie Cellulaire des Invertébrés, Université Paris VI6, 12 rue Cuvier, 75 005 Paris, France. stephanie.bordenave@snv.jussieu.fr
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Auzoux-Bordenave
authors.forename: Philippe-Jacques
authors.initials: PJ
authors.lastname: Hatt
authors.forename: Patrick
authors.initials: P
authors.lastname: Porcheron
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects*; D002460:Cell Line; D004441:Ecdysterone / Q000494:pharmacology*; D000078404:Epidermal Cells; D005455:Fluorescent Antibody Technique; D008938:Mitosis; D009036:Moths / Q000166:cytology; D016196:S Phase; D014404:Tubulin / Q000378:metabolism
chemical_list: D014404:Tubulin; D004441:Ecdysterone