The commercial pig as a model of spontaneously-occurring osteoarthritis

Research output: Contribution to journalArticle

Authors

  • Mhairi Macfadyen
  • Tim Parr
  • John Brameld
  • Andrew Murton
  • Simon Jones

Colleges, School and Institutes

Abstract

Background
Preclinical osteoarthritis models where damage occurs spontaneously may better reflect the initiation and development of human osteoarthritis. The aim was to assess the commercial pig as a model of spontaneous osteoarthritis development by examining pain-associated behaviour, joint cartilage integrity, as well as the use of porcine cartilage explants and isolated chondrocytes and osteoblasts for ex vivo and in vitro studies.

Methods
Female pigs (Large white x Landrace x Duroc) were examined at different ages from 6 weeks to 3–4 years old. Lameness was assessed as a marker of pain-associated behaviour. Femorotibial joint cartilage integrity was determined by chondropathy scoring and histological staining of proteoglycan. IL-6 production and proteoglycan degradation was assessed in cartilage explants and primary porcine chondrocytes by ELISA and DMMB assay. Primary porcine osteoblasts from damaged and non-damaged joints, as determined by chondropathy scoring, were assessed for mineralisation, proliferative and mitochondrial function as a marker of metabolic capacity.

Results
Pigs aged 80 weeks and older exhibited lameness. Osteoarthritic lesions in femoral condyle and tibial plateau cartilage were apparent from 40 weeks and increased in severity with age up to 3–4 years old. Cartilage from damaged joints exhibited proteoglycan loss, which positively correlated with chondropathy score. Stimulation of porcine cartilage explants and primary chondrocytes with either IL-1β or visfatin induced IL-6 production and proteoglycan degradation. Primary porcine osteoblasts from damaged joints exhibited reduced proliferative, mineralisation, and metabolic capacity.

Conclusion
In conclusion, the commercial pig represents an alternative model of spontaneous osteoarthritis and an excellent source of tissue for in vitro and ex vivo studies.

Details

Original languageEnglish
Article number70
JournalBMC Musculoskeletal Disorders
Volume20
Early online date11 Feb 2019
Publication statusE-pub ahead of print - 11 Feb 2019

Keywords

  • Animals, Behavior, Animal, Cartilage, Articular/metabolism, Cell Proliferation, Cells, Cultured, Chondrocytes/metabolism, Chondrogenesis, Disease Models, Animal, Disease Progression, Female, Interleukin-6/metabolism, Joints/metabolism, Osteoarthritis/metabolism, Osteoblasts/metabolism, Osteogenesis, Proteoglycans/metabolism, Proteolysis, Severity of Illness Index, Sus scrofa, Time Factors