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Induction of Macrophage Migration Inhibitory Factor in ConA-Stimulated Rheumatoid Arthritis Synovial Fibroblasts through the P38 MAP Kinase-Dependent Signaling Pathway
The Korean Journal of Internal Medicine ; : 317-326, 2010.
Article in English | WPRIM | ID: wpr-103224
ABSTRACT
BACKGROUND/

AIMS:

This study was undertaken to identify the intracellular signaling pathway involved in induction of macrophage migration inhibitory factor (MIF) in human rheumatoid arthritis (RA) synovial fibroblasts.

METHODS:

Human RA synovial fibroblasts were treated with concanavalin A (ConA), various cytokines, and inhibitors of signal transduction molecules. The production of MIF by synovial fibroblasts was measured in culture supernatants by ELISA. The expression of MIF mRNA was determined using reverse transcriptase polymerase chain reaction (RT-PCR) and real-time PCR. Phosphorylation of p38 mitogen-activated protein (MAP) kinase in synovial fibroblasts was confirmed using Western blotting. The expression of MIF and p38 MAP kinase in RA synovium was determined using dual immunohistochemistry.

RESULTS:

The production of MIF by RA synovial fibroblasts increased in a dose-dependent manner after ConA stimulation. MIF was also induced by interferon-gamma, CD40 ligand, interleukin-15, interleukin-1beta, tumor necrosis factor-alpha, and transforming growth factor-beta. The production of MIF by RA synovial fibroblasts was significantly reduced after inhibition of p38 MAP kinase. The expression of MIF and p38 MAP kinase was upregulated in the RA synovium compared with the osteoarthritis synovium.

CONCLUSIONS:

These results suggest that MIF production was induced through a p38 MAP-kinase-dependent pathway in RA synovial fibroblasts.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Arthritis, Rheumatoid / Synovial Membrane / RNA, Messenger / Base Sequence / Signal Transduction / Cells, Cultured / Cytokines / Macrophage Migration-Inhibitory Factors / DNA Primers / Concanavalin A Type of study: Prognostic study Limits: Humans Language: English Journal: The Korean Journal of Internal Medicine Year: 2010 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Arthritis, Rheumatoid / Synovial Membrane / RNA, Messenger / Base Sequence / Signal Transduction / Cells, Cultured / Cytokines / Macrophage Migration-Inhibitory Factors / DNA Primers / Concanavalin A Type of study: Prognostic study Limits: Humans Language: English Journal: The Korean Journal of Internal Medicine Year: 2010 Type: Article