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Integrative Physiology |
From the Burnett College of Biomedical Sciences (L.Z., A.A., J.N., S.G., M.C., F.M.A., C.Y., P.E.K.), University of Central Florida, Orlando; Dorothy M. Davis Heart and Lung Research Institute and the Division of Cardiovascular Medicine of the Ohio State University (P.F.B.), Columbus.
Correspondence to Dr P.E. Kolattukudy, Burnett College of Biomedical Sciences, University of Central Florida, Building 20, Room 136, Orlando, FL 32816-2364. E-mail pk{at}mail.ucf.edu
Monocyte chemoattractant protein-1 (MCP-1; CCL2)mediated inflammation plays a critical role in the development of ischemic heart disease (IHD). However, the gene expression changes caused by signal transduction, triggered by MCP-1 binding to its receptor CCR2, and their possible role in the development of IHD are not understood. We present evidence that MCP-1 binding to CCR2 induces a novel transcription factor (MCP-induced protein [MCPIP]) that causes cell death. Gene microarray analysis showed that when expressed in hiuman embryonic kidney 293 cells, MCPIP induced apoptotic gene families before causing cell death. Mutagenesis studies showed that the structural features required for transcription factorlike activity were also required for causing cell death. Activation of caspase-3 was detected after MCPIP transfection and Z-VAD-fmk partially inhibited cell death. Cardiomyocyte-targeted expression of MCP-1 in mice caused death by heart failure at 6 months of age. MCPIP expression increased in parallel with the development of ventricular dysfunction. In situ hybridization showed the presence of MCPIP transcripts in the cardiomyocytes and immunohistochemistry showed that MCPIP was associated with the cardiomyocyte nuclei of apoptotic cardiomyocytes. CCR2 expression in cardiomyocytes increased with the development of IHD. MCPIP production induced by MCP-1 binding to CCR2 in the cardiomyocytes is probably involved in the development of IHD in this murine model. MCPIP transcript levels were much higher in the explanted human hearts with IHD than with nonischemic heart disease. These results provide a molecular insight into how chronic inflammation and exposure to MCP-1 contributes to heart failure and suggest that MCPIP could be a potential target for therapeutic intervention.
Key Words: MCP-1 MCP-induced protein (MCPIP) monocyte/macrophages MCP-1induced transcription factor MCPIP-induced cell death
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