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Published in: BMC Musculoskeletal Disorders 1/2016

Open Access 01-12-2016 | Research article

Molecular changes indicative of cartilage degeneration and osteoarthritis development in patients with anterior cruciate ligament injury

Authors: Ioanna Papathanasiou, Sotirios Michalitsis, Michael E. Hantes, Marianna Vlychou, Lydia Anastasopoulou, Konstantinos N. Malizos, Aspasia Tsezou

Published in: BMC Musculoskeletal Disorders | Issue 1/2016

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Abstract

Background

Anterior cruciate ligament (ACL) tear is considered a risk factor for osteoarthritis development. The purpose of our study was to investigate the expression levels of the apoptotic enzyme caspase 3, pro-inflammatory cytokines interleukin-1β (IL-1β) and interleukin-6 (IL-6) and degrading enzyme matrix metalloproteinase 13 (MMP-13), all indicative of cartilage degeneration and osteoarthritis development in patients’ chondrocytes after ACL rupture.

Methods

We investigated the correlation between grade of cartilage degradation and time from injury or patients’ age. IL-1β, IL-6 and MMP-13 mRNA expression levels were investigated in normal (n = 4) and chondrocytes from patients with ACL rupture (n = 33) using real-time polymerase chain reaction (PCR). Moreover, MMP-13 and caspase-3 protein expression levels were evaluated by western blot analysis. Trend analysis and correlation coefficient were performed to derive the relations between gene expression (MMP13, IL-6, IL-1β) and grading of cartilage defects and between gene expression (MMP13, IL-6, IL-1β) and patients’ age, respectively.

Results

Correlations were established between grade of cartilage degradation and time from injury. MMP-13, IL-6, IL-1β and caspase 3 expression levels were significantly upregulated in chondrocytes from ACL-deficient knee compared to normal. Among the patients with ACL-deficient knees, a significant upregulation of MMP-13 was observed in patients with ACL-rupture > 18 months from the time of injury to arthroscopy compared to patients with ACL-injury up to 18 months, whereas IL-6 and IL-1β expression was higher in chondrocytes from patients with more than 10 months ACL injury compared to those that underwent surgery within the first 10 months after injury. Νο association was observed between IL-1β, IL-6 and MMP-13 expression levels and cartilage defects or patients’ age.

Conclusion

Our results showed that increased levels of apoptotic, inflammatory and catabolic factors in chondrocytes are associated with time from injury and could contribute to cartilage degradation and osteoarthritis development after ACL rupture.
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Metadata
Title
Molecular changes indicative of cartilage degeneration and osteoarthritis development in patients with anterior cruciate ligament injury
Authors
Ioanna Papathanasiou
Sotirios Michalitsis
Michael E. Hantes
Marianna Vlychou
Lydia Anastasopoulou
Konstantinos N. Malizos
Aspasia Tsezou
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2016
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-016-0871-8

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