PMID: 11336784May 5, 2001Paper

Wnts differentially regulate colony growth and differentiation of chondrogenic rat calvaria cells

Biochimica Et Biophysica Acta
C BergwitzG Brabant

Abstract

The wingless- and int-related proteins (Wnts) have an important role during embryonic development and limb patterning. To investigate their function during chondrocyte differentiation, we used NIH3T3 cells producing seven members of the Wnt family and secreted frizzled-related protein (sFRP-2) for co-culture experiments with the rat chondrogenic cell line pColl(II)-EGFP-5. Pilot experiments showed a negative effect of Wnt-7a on the proliferation of three rodent chondrogenic cell lines, RCJ3.1(C5.18), CFK-2, and C1. To establish a reporter system for chondrogenic differentiation we then produced a stably transfected chondrogenic cell line based on RCJ3.1(C5.18) for further experiments, which expresses green fluorescence protein (EGFP) under the collagen type II promoter (pColl(II)-EGFP-5). This cell line permits convenient observation of green fluorescence as a marker for differentiation in life cultures. The colony size of this cell line in agarose suspension cultures was reduced to 20-40% of control, when exposed to Wnt-1, 3a, 4, 7a, and 7b for 14 days. Similarly, reporter gene expression and the synthesis of cartilage-specific proteoglycans were inhibited by this group of Wnts. In contrast, pColl(II)-EGFP-5 cells exposed to W...Continue Reading

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