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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bu, Shizhong Kapanadze, Bagrat Hsu, Tien Trojanowska, Maria |
| Description | Author Affiliation: Bu S ( Division of Rheumatology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425, USA.) |
| Abstract | Transforming growth factor-beta (TGF-beta) is an important regulator of physiological connective tissue biosynthesis and plays a central role in pathological tissue fibrosis. Previous studies have established that a biologically active lipid mediator, sphingosine 1-phosphate (S1P), mimics some of the profibrotic functions of TGF-beta through cross-activation of Smad signaling. Here we report that another product of sphingosine kinase, dihydrosphingosine 1-phosphate (dhS1P), has an opposite role in the regulation of TGF-beta signaling. In contrast to S1P, dhS1P inhibits TGF-beta-induced Smad2/3 phosphorylation and up-regulation of collagen synthesis. The effects of dhS1P require a lipid phosphatase, PTEN, a key modulator of cell growth and survival. dhS1P stimulates phosphorylation of the C-terminal domain of PTEN and its subsequent translocation into the nucleus. We demonstrate a novel function of nuclear PTEN as a co-factor of the Smad2/3 phosphatase, PPM1A. Complex formation of PTEN with PPM1A does not require the lipid phosphatase activity but depends on phosphorylation of the serine/threonine residues located in the C-terminal domain of PTEN. Upon complex formation with PTEN, PPM1A is protected from degradation induced by the TGF-beta signaling. Consequently, overexpression of PTEN abrogates TGF-beta-induced Smad2/3 phosphorylation. This study establishes a novel role for nuclear PTEN in the stabilization of PPM1A. PTEN-mediated cross-talk between the sphingolipid and TGF-beta signaling pathways may play an important role in physiological and pathological TGF-beta signaling. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 28 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-07-11 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Nucleus Metabolism Lysophospholipids Multienzyme Complexes PTEN Phosphohydrolase Phosphoprotein Phosphatases Signal Transduction Smad2 Protein Smad3 Protein Sphingosine Analogs & Derivatives Transforming Growth Factor Beta Active Transport, Cell Nucleus Cell Line Cell Survival Collagen Biosynthesis Enzyme Stability Fibrosis Antagonists & Inhibitors Phosphorylation Protein Structure, Tertiary Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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