title: Evidence for multiple peroxisome proliferator-activated receptor gamma transcripts in bone: fine-tuning by hormonal regulation and mRNA stability.
abstract: The expression, regulation and functional significance of multiple peroxisome proliferator-activated receptor gamma transcript variants in bone were studied. PPARG transcripts giving rise to PPARg-1 protein were expressed in human osteoblasts, whereas PPARG-2 transcript and protein remained virtually absent. PPARG expression underwent homologous regulation, was upregulated during differentiation and directly induced by the osteogenic hormone dexamethasone, suggesting a role for PPARg-1 in osteogenesis. Differences between the stabilities of PPARG-1, -3 and -4 were observed. We hypothesize that cell-specific expression patterns of multiple PPARG transcript variants encoding for the same protein but differing in mRNA stabilities enable a fine-tuning of PPARG action, which eventually supports a well-adjusted signal transduction between the cell and its environment.
authors.affiliation: Department of Internal Medicine, Erasmus MC, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands.
authors.forename: Claudia
authors.initials: C
authors.lastname: Bruedigam
authors.forename: Marijke
authors.initials: M
authors.lastname: Koedam
authors.forename: Hideki
authors.initials: H
authors.lastname: Chiba
authors.forename: Marco
authors.initials: M
authors.lastname: Eijken
authors.forename: Johannes P T M
authors.initials: JP
authors.lastname: van Leeuwen
mesh_terms: D017398:Alternative Splicing; D001842:Bone and Bones / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D003907:Dexamethasone / Q000494:pharmacology; D005786:Gene Expression Regulation; D006801:Humans; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D047495:PPAR gamma / Q000819:agonists / Q000235:genetics*; D020871:RNA Stability; D012333:RNA, Messenger / Q000378:metabolism*; D000077154:Rosiglitazone; D045162:Thiazolidinediones / Q000494:pharmacology; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D047495:PPAR gamma; D012333:RNA, Messenger; D045162:Thiazolidinediones; D000077154:Rosiglitazone; D003907:Dexamethasone