NAMPT (visfatin), a Direct Target of Hypoxia-inducible Factor-2α, is an Essential Catabolic Regulator of Osteoarthritis

Overview

Journal Ann Rheum Dis

Specialty Rheumatology

Date 2013 Dec 19

PMID 24347567

Citations 57

Authors

Siyoung Yang

Je-Hwang Ryu

Hwanhee Oh

Jimin Jeon

Ji-Sun Kwak

Jin-Hong Kim

Hyun Ah Kim

Churl-Hong Chun

Jang-Soo Chun

Affiliations

Soon will be listed here.

Abstract

Objective: Hypoxia-inducible factor 2α (HIF-2α), encoded by Epas1, causes osteoarthritic cartilage destruction by regulating the expression of matrix-degrading enzymes. We undertook this study to explore the role of nicotinamide phosphoribosyltransferase (NAMPT or visfatin) in HIF-2α-mediated osteoarthritic cartilage destruction.

Methods: The expression of HIF-2α, NAMPT and matrix-degrading enzymes was determined at the mRNA and protein levels in human osteoarthritis (OA) cartilage, mouse experimental OA cartilage and primary cultured mouse chondrocytes. Experimental OA in mice was induced by destabilisation of the medial meniscus (DMM) surgery or intra-articular injection of Ad-Epas1 or Ad-Nampt in wild-type, Epas1(+/-), Epas1(fl/fl);Col2a1-Cre and Col2a1-Nampt transgenic (TG) mice. Primary cultured mouse chondrocytes were treated with recombinant NAMPT protein or were infected with adenoviruses.

Results: We found that the Nampt gene is a direct target of HIF-2α in articular chondrocytes and OA cartilage. NAMPT protein, in turn, increased mRNA levels and activities of MMP3, MMP12 and MMP13 in chondrocytes, an action that was necessary for HIF-2α-induced expression of catabolic enzymes. Gain-of-function studies (intra-articular injection of Ad-Nampt; Col2a1-Nampt TG mice) and loss-of-function studies (intra-articular injection of the NAMPT inhibitor FK866) demonstrated that NAMPT is an essential catabolic regulator of osteoarthritic cartilage destruction caused by HIF-2α or DMM surgery.

Conclusions: Our findings indicate that NAMPT, whose corresponding gene is a direct target of HIF-2α, plays an essential catabolic role in OA pathogenesis and acts as a crucial mediator of osteoarthritic cartilage destruction caused by HIF-2α or DMM surgery.

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