Artigo Revisado por pares

Expression and release of insulin-like growth factor binding proteins in isolated epiphyseal growth plate chondrocytes from the ovine fetus

2000; Wiley; Volume: 183; Issue: 2 Linguagem: Inglês

10.1002/(sici)1097-4652(200005)183

ISSN

1097-4652

Autores

Paolo De Los Rios, David J. Hill,

Tópico(s)

Neonatal Respiratory Health Research

Resumo

Journal of Cellular PhysiologyVolume 183, Issue 2 p. 172-181 Original Article Expression and release of insulin-like growth factor binding proteins in isolated epiphyseal growth plate chondrocytes from the ovine fetus P. De Los Rios, P. De Los Rios Lawson Research Institute, St. Joseph's Health Centre, London, Ontario, Canada Department of Physiology, University of Western Ontario, London, Ontario, CanadaSearch for more papers by this authorD.J. Hill, Corresponding Author D.J. Hill [email protected] Lawson Research Institute, St. Joseph's Health Centre, London, Ontario, Canada Department of Physiology, University of Western Ontario, London, Ontario, Canada Department of Medicine, University of Western Ontario, London, Ontario, Canada Department of Paediatrics, University of Western Ontario, London, Ontario, CanadaLawson Research Institute, St. Joseph's Health Centre, 268 Grosvenor Street, London, Ontario, Canada, N6A 4V2. tel: (519) 646-6100 × 4716, fax: (519) 646-6110,Search for more papers by this author P. De Los Rios, P. De Los Rios Lawson Research Institute, St. Joseph's Health Centre, London, Ontario, Canada Department of Physiology, University of Western Ontario, London, Ontario, CanadaSearch for more papers by this authorD.J. Hill, Corresponding Author D.J. Hill [email protected] Lawson Research Institute, St. Joseph's Health Centre, London, Ontario, Canada Department of Physiology, University of Western Ontario, London, Ontario, Canada Department of Medicine, University of Western Ontario, London, Ontario, Canada Department of Paediatrics, University of Western Ontario, London, Ontario, CanadaLawson Research Institute, St. Joseph's Health Centre, 268 Grosvenor Street, London, Ontario, Canada, N6A 4V2. tel: (519) 646-6100 × 4716, fax: (519) 646-6110,Search for more papers by this author First published: 24 March 2000 https://doi.org/10.1002/(SICI)1097-4652(200005)183:2 3.0.CO;2-SCitations: 16AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Insulin-like growth factor-II (IGF-II) is an autocrine modulator of epiphyseal chondrogenesis in the fetus. The cellular availability of IGFs are influenced by the IGF-binding proteins (IGFBPs). In this study, we investigated the control of expression and release of IGFBPs from isolated epiphyseal growth plate chondrocytes from the ovine fetus by hormones and growth factors implicated in the chondrogenic process. Chondrocytes were isolated from the proliferative zone of the fetal ovine proximal tibial growth plate and maintained in monolayer culture at early passage number. Culture media conditioned by chondrocytes under basal conditions released IGFBPs of 24, 34, and 29 kDa, and a less abundant species of 39–43 kDa that were identified immunologically as IGFBP-4, IGFBP-2, IGFBP-5, and IGFBP-3, respectively. Messenger RNAs encoding each species were identified by Northern blot analysis within chondrocytes, as was mRNA encoding IGFBP-6. Exposure to IGF-I or IGF-II (13 or 26 nM) caused an increase in expression and release of IGFBP-3. The release of IGFBP-2 and IGFBP-5 were also potentiated without changes to steady state mRNA, and for IGFBP-5 this was due in part to a release from the cell membrane in the presence of IGF-II. Insulin (16.7 or 167 nM) selectively increased mRNA and the release of IGFBP-3, while cortisol (1 or 5 μM) inhibited both mRNA and release of IGFBP-2 and IGFBP-5. Transforming growth factor-β1 (TGF-β1) (0.1 or 0.2 nM) increased the expression and release of IGFBP-3, and caused an increase in mRNAs encoding IGFBP-2 and IGFBP-5. Neither growth hormone (GH), fibroblast growth factor-2, nor thyroxine (T4) had any effect on IGFBP expression or release. 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Citing Literature Volume183, Issue2May 2000Pages 172-181 ReferencesRelatedInformation

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