Journal
OSTEOARTHRITIS AND CARTILAGE
Volume 16, Issue 10, Pages 1141-1149Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.joca.2008.02.007
Keywords
Polymorphism; Osteoarthritis; Wnt; FRZB; LRP5; LRP6
Categories
Funding
- European Commission [OLK6-2002-02629]
- Arthritis Research Campaign
- Master of Science Clinical Epidemiology
- Netherlands Institute of Health Sciences
- Trustfonds Erasmus University Rotterdam
- Versus Arthritis [17489] Funding Source: researchfish
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Objective: To examine the association of genetic variation in key players in the Wnt signaling pathway with aspects of osteoarthritis (OA) in two population-based cohort studies: the Rotterdam Study and the Chingford Study. Methods: Radiographic OA (ROA) was defined as a Kellgren/Lawrence score (K/L) score >= 2 for the knee and hip. Total hip replacement (THR) was scored. Hand OA was defined as presence of ROA (K/L >= 2) in two out of three hand joint groups [distal interphalangeal (DIPs), proximal interphalangeal (PIPs), first carpometacarpal (CMC1)/trapezio-scaphoid joint (TS)] of each hand. The concentration of urinary C-terminal cross-linked telopeptide of type II collagen (CTX-II) was standardized to the total urine creatinine. Genotypes for the amino acid variants, Arg200Trp and Arg324Gly of Frizzled-Related protein gene (FRZB), Ala1330Val of Low-density lipoprotein receptor-related protein 5 (LRP5) and Ile1062Val of Low-density lipoprotein receptor-related protein 6 (LRP6), were obtained using the Tagman allelic discrimination assay. A meta-analysis was performed for the FRZB Arg324Gly polymorphism and hip- and knee-OA using RevMan version 4.3. Results: No consistent associations were observed between the FRZB, LRP5 and LRP6 amino acid variants and radiographic hip-, knee-, or hand-OA or THR, in either study population, While power was limited for most studies to date, a meta-analysis of all published studies regarding the FRZB Arg324Gly polymorphism was performed for hip- and knee-OA seperately. This showed no significant associations between the Gly324 allele and risk for hip- or knee OA, although there was large heterogeneity between studies for hip OA in females. Conclusion: No association was seen between FRZB, LRP5 and LRP6 variants with radiographic osteoarthritic outcomes in two population-based cohorts. In future studies, increased power and standardization of OA-phenotypes are highly recommended for replication studies and to allow meta-analysis. (C) 2008 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.
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