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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ryan, Stephen J. Spee, Christine Wu, Jian Zhu, Danhong Hinton, David R. |
| Description | Author Affiliation: Zhu D ( Arnold and Mabel Beckman Macular Research Center, Keck School of Medicine of the University of Southern California, Los Angeles, California 90033, USA.) |
| Abstract | The retinal pigment epithelium is a primary site of pathology in age-related macular degeneration. Oxidative stress and senescence are both thought to be important mediators of macular degeneration pathogenesis. We demonstrate here that bone morphogenetic protein-4 is highly expressed in the retinal pigment epithelium and adjacent extracellular matrix of patients with dry age-related macular degeneration. In vitro studies revealed that sublethal oxidative stress increased bone morphogenetic protein-4 expression in retinal pigment epithelial cells, and both bone morphogenetic protein-4 and persistent mild oxidative stress can induce retinal pigment epithelial cell senescence through p53-p21(Cip1/WAF1)-Rb pathway. We further demonstrate that bone morphogenetic protein-4 acts as a mediator in oxidative stress-induced senescence and that this mediator function is via Smad and the p38 signaling pathway to increase and activate p53 and p21(Cip1/WAF1) and decrease phospho-Rb. Oxidative stress-induced senescence can be blocked by Chordin-like, an antagonist of bone morphogenetic protein-4, or SB203580, a phospho-p38 inhibitor. Our results suggest that oxidative stress and bone morphogenetic protein-4 may interact to promote retinal pigment epithelial cell senescence and that bone morphogenetic protein-4 may represent a novel therapeutic target to inhibit the progressive effects of oxidative stress and senescence in dry age-related macular degeneration. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 14 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-04-03 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bone Morphogenetic Protein 4 Metabolism Cell Aging Physiology Macular Degeneration Oxidative Stress Retinal Pigment Epithelium Genetics Cell Cycle Cells, Cultured Gene Expression Regulation Phosphorylation Smad Proteins P38 Mitogen-Activated Protein Kinases 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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