Volume 54, Issue 7 pp. 2074-2083
Research Article

Direct modulation of rheumatoid inflammatory mediator expression in retinoblastoma protein–dependent and –independent pathways by cyclin-dependent kinase 4/6

Yoshinori Nonomura

Yoshinori Nonomura

Tokyo Medical and Dental University, Tokyo, and RIKEN Research Center of Allergy and Immunology, Yokohama, Japan

Drs. Nonomura and Nagasaka contributed equally to this work.

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Kenji Nagasaka

Kenji Nagasaka

Tokyo Medical and Dental University, Tokyo, Japan

Drs. Nonomura and Nagasaka contributed equally to this work.

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Hiroyuki Hagiyama

Hiroyuki Hagiyama

Tokyo Medical and Dental University, Tokyo, Japan

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Chiyoko Sekine

Chiyoko Sekine

Tokyo Medical and Dental University, Tokyo, and RIKEN Research Center of Allergy and Immunology, Yokohama, Japan

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Toshihiro Nanki

Toshihiro Nanki

Tokyo Medical and Dental University, Tokyo, Japan

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Mimi Tamamori-Adachi

Mimi Tamamori-Adachi

Tokyo Medical and Dental University, Tokyo, Japan

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Nobuyuki Miyasaka

Nobuyuki Miyasaka

Tokyo Medical and Dental University, Tokyo, Japan

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Hitoshi Kohsaka

Corresponding Author

Hitoshi Kohsaka

Tokyo Medical and Dental University, Tokyo, and RIKEN Research Center of Allergy and Immunology, Yokohama, Japan

Department of Medicine and Rheumatology, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, 113-8519 Tokyo, JapanSearch for more papers by this author
First published: 27 June 2006
Citations: 31

Abstract

Objective

It is known that the cyclin-dependent kinase inhibitor (CDKI) gene p21Cip1 suppresses rheumatoid inflammation by down-modulating type I interleukin-1 receptor (IL-1RI) expression and inhibiting JNK activity. The purpose of this study was to determine whether CDK activity directly modulates the production of inflammatory molecules in patients with rheumatoid arthritis (RA).

Methods

Genes for the CDKIs p16INK4a and p18INK4c, a constitutively active form of retinoblastoma (RB) gene product, cyclin D1, and CDK-4, were transferred into RA synovial fibroblasts (RASFs). RASFs were also treated with a synthetic CDK-4/6 inhibitor (CDK4I). Levels of matrix metalloproteinase 3 (MMP-3), monocyte chemoattractant protein 1 (MCP-1), and IL-1RI expression were determined by Northern blotting, real-time polymerase chain reaction analysis, and enzyme-linked immunosorbent assay. CDKIs were immunoprecipitated to reveal their association with JNK.

Results

Transfer of the p16INK4a and p18INK4c genes and CDK4I suppressed the production of MMP-3 and MCP-1. Unlike p21Cip1, neither CDKI gene inhibited IL-1RI or JNK. The expression of MMP-3 was up-regulated when CDK-4 activity was augmented. This regulation functioned at the messenger RNA (mRNA) level in MMP-3, but not in MCP-1. Transfer of active RB suppressed the production of MMP-3 and MCP-1 without changing their mRNA levels.

Conclusion

CDK-4/6 modulated the production of MMP-3 and MCP-1. MMP-3 production was regulated primarily at the mRNA level in an RB-independent manner, whereas MCP-1 production was controlled posttranscriptionally by RB. These results show that cell cycle proteins are associated with control of mediators of inflammation through multiple pathways.

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