Premium
Potential involvement of SIRT1 in the pathogenesis of osteoarthritis through the modulation of chondrocyte gene expressions
Author(s) -
Fujita Norifumi,
Matsushita Takehiko,
Ishida Kazunari,
Kubo Seiji,
Matsumoto Tomoyuki,
Takayama Koji,
Kurosaka Masahiro,
Kuroda Ryosuke
Publication year - 2011
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.21284
Subject(s) - chondrocyte , aggrecan , pathogenesis , osteoarthritis , cartilage , gene expression , medicine , immunohistochemistry , microbiology and biotechnology , pathology , gene , biology , cancer research , anatomy , genetics , articular cartilage , alternative medicine
SIRT1 has been implicated as a key factor in aging‐related diseases. Nevertheless, the role of SIRT1 in the pathogenesis of osteoarthritis (OA) is still unknown. We examined the expression of SIRT1 in cartilage samples and the effect of SIRT1 inhibition on chondrocyte gene expression changes to elucidate the role of SIRT1 in chondrocytes. SIRT1 expression was examined using cartilage samples from patients undergoing total knee arthroplasty and femoral head replacement by immunohistochemistry. The effect of SIRT1 inhibition by siRNA on chondrocyte gene expression was examined by real‐time PCR and Western blotting. SIRT1 expression was barely detectable in the severely degenerated cartilage while SIRT1 was clearly expressed in the less damaged cartilage. The inhibition of SIRT1 by siRNA induced OA‐like gene expression changes, namely the significant down‐regulation of aggrecan and up‐regulation of COL10A1 and ADAMTS‐5 . Our observations suggest that SIRT1 expression decreases with development of OA and the reduction of SIRT1 in chondrocytes may cause chondrocyte hypertrophy and cartilage matrix loss. SIRT1 might play important roles in the pathogenesis of OA. © 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 29:511–515, 2011