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First Insights into Human Acetabular Labrum Cell Metabolism.
MedLine Citation:
PMID:  22503910     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: Hip labrum pathology has only begun to emerge as a significant source of groin pain in the last decade since the development of hip arthroscopy. Few data are available on the anatomy, histology and function of this structure. Moreover, no metabolic data exist at cellular level. The aim of this study was to characterize extracellular matrix (ECM) genes and pro-inflammatory mediators expressed by these cells. METHODS: Isolated human acetabular labrum cells were cultured in alginate beads for 10 days and additionally stimulated with IL-1 for 24 hours. Gene expression levels and secretion of different ECM genes, enzymes and cytokines were examined by quantitative PCR and ELISA to assess the metabolic characteristics of labrum cells. Articular chondrocytes and meniscus cells served as controls. RESULTS: Labrum cells expressed high levels of COL1A1 and low levels of COL2A1, aggrecan and SOX-9 compared to chondrocytes. However, COL2A1 was more expressed by labrum cells than by meniscus cells. The expression of MMP-1/-2/-9, ADAMTS-4 and IL-6 was significantly higher in labrum cells than in chondrocytes. IL-1 suppressed the ECM gene expression levels of labrum cells, but increased the expression levels and release of MMP-1/-3/-9/-13 and ADAMTS-4 and IL-6 by these cells. Remarkably, MMP-9 was only significantly upregulated in acetabular labrum cells. CONCLUSIONS: The findings in this study demonstrated that the acetabular labrum is populated with unique highly active fibrochondrocyte-like cells. These cells are capable of expressing and releasing pro-inflammatory enzymes and cytokines and react to a pro-inflammatory stimulus. In this way, they contribute obviously to disturbed tissue function in hip labrum pathology.
Authors:
Aad A M Dhollander; Stijn Lambrecht; Peter C M Verdonk; Emmanuel A Audenaert; Karl F Almqvist; Christophe Pattyn; René Verdonk; Dirk Elewaut; Gust Verbruggen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-10
Journal Detail:
Title:  Osteoarthritis and cartilage / OARS, Osteoarthritis Research Society     Volume:  -     ISSN:  1522-9653     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9305697     Medline TA:  Osteoarthritis Cartilage     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Laboratory of Connective Tissue Biology, Department of Rheumatology, Ghent University, Ghent, Belgium; Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, Ghent, Belgium.
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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