Volume 58, Issue 12 pp. 3843-3853
Osteoarthritis

Zonal gene expression of chondrocytes in osteoarthritic cartilage

Naoshi Fukui

Corresponding Author

Naoshi Fukui

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

Naoshi Fukui, Clinical Research Center, National Hospital Organization Sagamihara Hospital, Sakuradai 18-1, Sagamihara, Kanagawa 228-8522, Japan

Shiro Ikegawa, Laboratory for Bone and Joint Diseases, SNP Research Center, RIKEN, Shirokanedai 4-6-1, Minato-ku, Tokyo 108-8639, Japan

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Yoshinari Miyamoto

Yoshinari Miyamoto

SNP Research Center, RIKEN, Tokyo, Japan

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Masahiro Nakajima

Masahiro Nakajima

SNP Research Center, RIKEN, Tokyo, Japan

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Yasuko Ikeda

Yasuko Ikeda

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Atsuhiko Hikita

Atsuhiko Hikita

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Hiroshi Furukawa

Hiroshi Furukawa

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Hiroyuki Mitomi

Hiroyuki Mitomi

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Nobuho Tanaka

Nobuho Tanaka

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Yozo Katsuragawa

Yozo Katsuragawa

International Medical Center of Japan, Tokyo, Japan

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Seizo Yamamoto

Seizo Yamamoto

Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan

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Motoji Sawabe

Motoji Sawabe

Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan

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Takuo Juji

Takuo Juji

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Toshihito Mori

Toshihito Mori

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Ryuji Suzuki

Ryuji Suzuki

National Hospital Organization Sagamihara Hospital, Kanagawa, Japan

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Shiro Ikegawa

Corresponding Author

Shiro Ikegawa

SNP Research Center, RIKEN, Tokyo, Japan

Naoshi Fukui, Clinical Research Center, National Hospital Organization Sagamihara Hospital, Sakuradai 18-1, Sagamihara, Kanagawa 228-8522, Japan

Shiro Ikegawa, Laboratory for Bone and Joint Diseases, SNP Research Center, RIKEN, Shirokanedai 4-6-1, Minato-ku, Tokyo 108-8639, Japan

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First published: 26 November 2008
Citations: 50

Abstract

Objective

To determine the chondrocyte metabolism in respective zones of osteoarthritic (OA) cartilage.

Methods

OA cartilage was obtained from macroscopically intact areas of 4 knee joints with end-stage OA. The cartilage was divided into 3 zones, and gene expression profiles were determined in the respective zones by a custom-designed microarray that focused on chondrocyte-related genes. For the genes whose expression was significantly different among the zones, the expression was compared between OA and control cartilage in the respective zones by an analysis using laser capture microdissection and real-time polymerase chain reaction (PCR). For some genes, the correlation of expression was investigated in specific cartilage zones.

Results

A total of 198 genes (∼40% of those investigated) were found to be expressed at significantly different levels among the zones. Expression of 26 of those genes was evaluated by laser capture microdissection and real-time PCR, which confirmed the validity of microarray analysis. The expression of cartilage matrix genes was mostly enhanced in OA cartilage, at similar levels across the zones but at different magnitudes among the genes. The expression of bone-related genes was induced either in the superficial zone or in the deep zone, and positive correlations were found among their expression in the respective zones. The expression of 5 proteinase genes was most enhanced in the superficial zone, where their expression was correlated, suggesting the presence of a common regulatory mechanism(s) for their expression.

Conclusion

In OA cartilage, the metabolic activity of chondrocytes differed considerably among zones. Characteristic changes were observed in the superficial and deep zones.

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