title: The protein-tyrosine phosphatase SHP-2 is required during angiotensin II-mediated activation of cyclin D1 promoter in CHO-AT1A cells.
abstract: Angiotensin II (Ang II) binds to specific G protein-coupled receptors and is mitogenic in Chinese hamster ovary (CHO) cells stably expressing a rat vascular angiotensin II type 1A receptor (CHO-AT(1A)). Cyclin D1 protein expression is regulated by mitogens, and its assembly with the cyclin-dependent kinases induces phosphorylation of the retinoblastoma protein pRb, a critical step in G(1) to S phase cell cycle progression contributing to the proliferative responses. In the present study, we found that in CHO-AT(1A) cells, Ang II induced a rapid and reversible tyrosine phosphorylation of various intracellular proteins including the protein-tyrosine phosphatase SHP-2. Ang II also induced cyclin D1 protein expression in a phosphatidylinositol 3-kinase and mitogen-activated protein kinase/extracellular signal-regulated kinase (MAPK/ERK)-dependent manner. Using a pharmacological and a co-transfection approach, we found that p21(ras), Raf-1, phosphatidylinositol 3-kinase and also the catalytic activity of SHP-2 and its Src homology 2 domains are required for cyclin D1 promoter/reporter gene activation by Ang II through the regulation of MAPK/ERK activity. Our findings suggest for the first time that SHP-2 could play an important role in the regulation of a gene involved in the control of cell cycle progression resulting from stimulation of a G protein-coupled receptor independently of epidermal growth factor receptor transactivation.
authors.affiliation: Laboratoire de Signalisation Cellulaire, Médiateurs Lipidiques et Contrôle de l'Expression des Gènes, CNRS UPRES-A 7079, Paris, France.
authors.forename: L
authors.initials: L
authors.lastname: Guillemot
authors.forename: A
authors.initials: A
authors.lastname: Levy
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Zhao
authors.forename: G
authors.initials: G
authors.lastname: Bereziat
authors.forename: B
authors.initials: B
authors.lastname: Rothhut
mesh_terms: D000804:Angiotensin II / Q000378:metabolism*; D000818:Animals; D016466:CHO Cells; D002384:Catalysis; D006224:Cricetinae; D019938:Cyclin D1 / Q000235:genetics*; D016193:G1 Phase; D005786:Gene Expression Regulation; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D011401:Promoter Regions, Genetic; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000502:physiology*; D019908:Proto-Oncogene Proteins c-raf / Q000378:metabolism; D016283:Proto-Oncogene Proteins p21(ras) / Q000378:metabolism; D051381:Rats; D044140:Receptor, Angiotensin, Type 1; D011945:Receptors, Angiotensin / Q000096:biosynthesis* / Q000235:genetics; D016196:S Phase; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D015533:Transcriptional Activation; D018909:src Homology Domains
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D044140:Receptor, Angiotensin, Type 1; D011945:Receptors, Angiotensin; D000804:Angiotensin II; D019938:Cyclin D1; D019869:Phosphatidylinositol 3-Kinases; D019908:Proto-Oncogene Proteins c-raf; D020928:Mitogen-Activated Protein Kinases; C516724:PTPN11 protein, human; C509249:PTPN6 protein, human; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C516727:Ptpn11 protein, rat; C509250:Ptpn6 protein, rat; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; C501009:HRAS protein, human; D016283:Proto-Oncogene Proteins p21(ras)