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FrzB-2: a human secreted frizzled-related protein with a potential role in chondrocyte apoptosis.

Abstract：

OBJECTIVE:To characterize a novel secreted frizzled-related protein (SFRP) and determine its tissue distribution at the mRNA and protein level. METHODS:The FrzB-2 gene was identified by expressed sequence tag (EST) analysis of human tissue-derived libraries. Tissue distribution of FrzB-2 mRNA was determined by Northern blot analysis and in situ hybridization. FrzB-2 protein reactivity was localized in human OA articular cartilage by immunocytochemistry, using a polyclonal antibody against a peptide sequence unique to FrzB-2. Apoptosis was detected in articular cartilage sections using Tunel staining. RESULTS:ESTs corresponding to FrzB-2 were found in osteoblast, chondrosarcoma, osteosarcoma, osteoclastoma and synovial fibroblast libraries. FrzB-2 mRNA is expressed in a number of tissues and cell types including bone-related cells and tissues such as primary human osteoblasts and osteoclastoma. In situ hybridization studies showed strong FrzB-2 mRNA expression in human chondrocytes in human osteoarthritic (OA) cartilage but negligible levels in normal cartilage chondrocytes. The FrzB-2 cDNA encodes a secreted 40 kDa protein consisting of 346 amino acids. FrzB-2 is 92. 5% identical to the rat orthologue, DDC-4, which has been shown to be associated with physiological apoptosis. FrzB-2 protein was selectively detected in human OA articular cartilage by immunocytochemistry, using a polyclonal antibody. Consistent with its potential role in apoptosis, positive FrzB-2 staining and Tunel positive nuclei staining were detected in chondrocyte clones in sections of human OA cartilage. CONCLUSION:These data suggest that FrzB-2 may play a role in apoptosis and that the expression of this protein may be important in the pathogenesis of human OA.

journal_name

Osteoarthritis Cartilage

journal_title

Osteoarthritis and cartilage

authors

James IE,Kumar S,Barnes MR,Gress CJ,Hand AT,Dodds RA,Connor JR,Bradley BR,Campbell DA,Grabill SE,Williams K,Blake SM,Gowen M,Lark MW

doi

10.1053/joca.1999.0321

keywords:

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

452-63

issue

6

eissn

1063-4584

issn

1522-9653

pii

S1063-4584(99)90321-7

journal_volume

8

pub_type

杂志文章

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