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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hsieh, Hsi-lung Yang, Chuen-mao Hsiao, Li-der Tseng, Chin-ping Yao, Chung-chen Wu, Chou Bing |
| Description | Author Affiliation: Yang CM ( Department of Pharmacology, Chang Gung University, Tao-Yuan 333, Taiwan.) |
| Abstract | Matrix metalloproteinase-13 (MMP-13, or collagenase 3) has been shown to degrade intact collagen and to participate in situations where rapid and effective remodeling of collagenous ECM is required. Mechanical strain induction of MMP-13 is an example of how osteoblasts respond to high mechanical forces and participate in the bone-remodeling mechanism. Using MC3T3-E1 osteoblast-like cells, we dissected the signaling molecules involved in MMP-13 induction by mechanical strain. Reverse transcription-PCR and zymogram analysis showed that platelet-derived growth factor receptor (PDGFR) inhibitor, AG1296, inhibited the mechanical strain-induced MMP-13 gene and activity. However, the induction was not affected by anti-PDGF-AA serum. Immunoblot analysis revealed time-dependent phosphorylation of PDGFR-alpha up to 2.7-fold increases within 3 min under strain. Transfection with shPDGFR-alpha (at 4 and 8 microg/ml) abolished PDGFR-alpha and reduced MMP-13 expression. Moreover, time-dependent recruitments of phosphoinositide 3-kinase (PI3K) by PDGFR-alpha were detected by immunoprecipitation with anti-PDGFR-alpha serum followed by immunoblot with anti-PI3K serum. AG1296 inhibited PDGFR-alpha/PI3K aggregation and Akt phosphorylation. Interestingly, protein kinase C-delta (PKC-delta) inhibitor, rottlerin, inhibited not only PDGFR-alpha/PI3K aggregation but PDGFR-alpha phosphorylation. The sequential activations were further confirmed by mutants DeltaPKC-delta, DeltaAkt, and DeltaERK1. Consistently, the primary mouse osteoblast cells used the same identified signaling molecules to express MMP-13 under mechanical strain. These results demonstrate that, in osteoblast-like cells, the MMP-13 induction by mechanical strain requires the transactivation of PDGFR-alpha by PKC-delta and the cross-talk between PDGFR-alpha/PI3K/Akt and MEK/ERK pathways. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 38 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-09-18 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Gene Expression Regulation, Enzymologic Physiology MAP Kinase Signaling System Matrix Metalloproteinase 13 Biosynthesis Protein Kinase C-delta Metabolism Receptor, Platelet-Derived Growth Factor Alpha Transcriptional Activation Animals Bone Remodeling Drug Effects Cell Line Genetics Mechanotransduction, Cellular Mice Mitogen-Activated Protein Kinase Kinases Mutation Osteoblasts Phosphatidylinositol 3-Kinases Phosphorylation Proto-Oncogene Proteins C-akt Antagonists & Inhibitors Time Factors Tyrphostins Pharmacology Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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