title: Immunohistochemical localization of ecdysteroid receptor and ultraspiracle in the epithelial cell line from Chironomus tentans (Insecta, Diptera).
abstract: Ecdysteroid receptor (EcR) and its heterodimerization partner, ultraspiracle (USP), were demonstrated in the epithelial cell line from Chironomus tentans by immunohistochemistry. In untreated cells both proteins are present in nuclei as well as in granular compartments of the cytosol. At 1 day after addition of 1-microM 20-OH-ecdysone (20E) total immunofluorescence had increased in the nuclei, whereas the cytoplasmic staining had disappeared. At the 2nd and 3rd days all cells within a vesicle appear identical according to morphological criteria, but the EcR and USP immunoreactivity becomes restricted into patches of neighbouring cells. The hormonally induced changes in the pattern of localization of functional ecdysteroid receptor, the heterodimer of EcR and USP, are discussed in relation to similar effects of 20E on acetylcholinesterase and muscarinic acetylcholine receptor distribution in this cell line.
authors.affiliation: Anatomisches Institut der Universität Tübingen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Lammerding-Köppel
authors.forename: M
authors.initials: M
authors.lastname: Spindler-Barth
authors.forename: E
authors.initials: E
authors.lastname: Steiner
authors.forename: M
authors.initials: M
authors.lastname: Lezzi
authors.forename: U
authors.initials: U
authors.lastname: Drews
authors.forename: K D
authors.initials: KD
authors.lastname: Spindler
mesh_terms: D000825:Animal Structures / Q000737:chemistry / Q000166:cytology; D000818:Animals; D002460:Cell Line; D002683:Chironomidae / Q000737:chemistry*; D003593:Cytoplasm / Q000737:chemistry; D004268:DNA-Binding Proteins / Q000819:agonists / Q000032:analysis* / Q000737:chemistry; D019281:Dimerization; D029721:Drosophila Proteins; D004440:Ecdysone / Q000494:pharmacology; D004847:Epithelial Cells / Q000737:chemistry*; D005455:Fluorescent Antibody Technique; D007425:Intracellular Membranes / Q000737:chemistry; D007447:Invertebrate Hormones / Q000032:analysis / Q000737:chemistry; D008854:Microscopy, Electron; D011987:Receptors, Steroid / Q000819:agonists / Q000032:analysis* / Q000737:chemistry; D014157:Transcription Factors / Q000819:agonists / Q000032:analysis* / Q000737:chemistry
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D007447:Invertebrate Hormones; D011987:Receptors, Steroid; D014157:Transcription Factors; C066030:USP protein, Drosophila; C034808:ecdysteroid receptor; D004440:Ecdysone