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Influence of p38MAPK inhibition on IL-1beta-stimulated human chondrocytes: a microarray approach
Helga Joos1, Wolfgang Albrecht, Stefan Laufer
1Division for Biochemistry of Joint and Connective Tissue Diseases, Department of Orthopedics, University of Ulm, Ulm, Germany.
Abstract:
Articular chondrocytes respond to extracellular influences by activating signaling pathways which change gene expression. One key signal transduction pathway of inflammatory joint disease is mediated by the p38MAPK which is known to be activated by the pro-inflammatory cytokine IL-1beta. We used the p38MAPK inhibitor SB203580 and a whole human genome microarray in an in vitro inflammation model to identify genes regulated by this pathway in human chondrocytes. We found that 1,141 genes were regulated by IL-1beta, and 646 genes were regulated by the inhibitor whereas 116 genes were co-regulated by both substances. To elucidate the overall effect of SB203580, a GoMiner pathway analysis was performed which revealed involvement of versatile biological processes. Predominantly affected terms were 'response to stimulus', 'oxygen metabolism' and 'ligase activity'. We discuss herein the relevance and function of affected fields including the involved genes and unexpected effects of p38MAPK inhibition as it relates to the context of cartilage. Our results do not predict a pro-apoptotic or cancer promoting effect and markedly extend the knowledge on p38MAPK inhibition in chondrocytes beyond primary target genes.
Insights
This study identifies genes regulated by p38 mitogen-activated protein kinase (MAPK) in human chondrocytes during inflammation. Inhibition of p38 MAPK affects numerous biological processes, offering new insights into cartilage biology.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Articular chondrocytes respond to extracellular signals via pathways affecting gene expression.
- The p38 MAPK pathway is crucial in inflammatory joint diseases and activated by IL-1beta.
- Understanding p38 MAPK regulation is vital for cartilage health.
Purpose of the Study:
- To identify genes regulated by p38 MAPK in human chondrocytes using an in vitro inflammation model.
- To investigate the broader biological effects of p38 MAPK inhibition beyond primary targets.
Main Methods:
- Utilized an in vitro inflammation model with human chondrocytes.
- Employed whole human genome microarrays to analyze gene expression.
- Applied p38 MAPK inhibitor SB203580 and IL-1beta.
- Performed GoMiner pathway analysis to elucidate affected biological processes.
Main Results:
- IL-1beta regulated 1,141 genes; SB203580 regulated 646 genes; 116 genes were co-regulated.
- GoMiner analysis revealed involvement in 'response to stimulus', 'oxygen metabolism', and 'ligase activity'.
- p38 MAPK inhibition did not show pro-apoptotic or cancer-promoting effects.
Conclusions:
- p38 MAPK inhibition influences a wide range of biological processes in chondrocytes.
- This study expands knowledge of p38 MAPK signaling in cartilage beyond known targets.
- Findings provide a comprehensive view of p38 MAPK pathway modulation in chondrocytes.
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