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Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_11 | Pages 287 - 287
1 Jul 2014
Semevolos S Kinsley M Duesterdieck-Zellmer K Riddick T
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Summary Statement

Differential expression of canonical and noncanonical Wnt signalling along cartilage canals and osteochondral junctions is dependent on age. Increased gene expression of PTHrP along cartilage canals and Ihh along osteochondral junctions suggests paracrine feedback in articular-epiphyseal cartilage.

Introduction

Wnt signaling has been shown to regulate chondrocyte differentiation during pre-/post-natal cartilage development. In addition, parathyroid-related peptide(PTHrP) and Indian hedgehog(Ihh) create a negative feedback loop in growth cartilage, but less is known in articular cartilage. The objective of this study was to elucidate expression of regulatory molecules in chondrocytes surrounding cartilage canals and osteochondral junctions during neonatal and pre-adolescent development. We hypothesised there would be increased expression of canonical Wnt signalling molecules and Ihh in osteochondral junction chondrocytes compared to cartilage canal chondrocytes. In addition, we hypothesised that Wnt signaling and PTHrP expression would be greater in neonates than pre-adolescents.