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Clodronate exerts an anabolic effect on articular chondrocytes mediated through the purinergic receptor pathway

Journal
Osteoarthritis and Cartilage
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.joca.2014.07.009
Keywords
Disciplines
  • Biology
  • Medicine
  • Pharmacology
License
Unknown

Abstract

Summary Objective Bisphosphonates are commonly used anti-osteoporotic drugs which have controversial effects on joint diseases including osteoarthritis. Certain bisphosphonates have been shown to have anabolic effects on cartilage which could have important ramifications for their proposed effects in vivo; however, the underlying mechanisms are poorly understood. Thus, the purpose of this study was to characterize the effects of clodronate on primary articular chondrocyte metabolism and to determine the underlying signaling pathways responsible. Design The effects of clodronate and pamidronate on extracellular matrix (ECM) biosynthesis, accumulation and MMP-13 activity were observed in high density, 3D cultures of bovine articular chondrocytes for up to 4 weeks were evaluated. Mechanisms were delineated by measuring intracellular Ca2+ signaling and the effects of pharmacologic inhibition of the purinergic receptor pathway. Results Clodronate (100 μM) induced an anabolic effect (increased biosynthesis by 13–14%) which resulted in an 89–90% increase in ECM accumulation after 4 weeks of culture and without an associated effect on matrix turn-over. Stimulation by clodronate resulted in a 3.3-fold increase in Ca2+ signaling and pharmacological inhibitor experiments suggested that the anabolic effects exerted by clodronate are transduced through the purinergic receptor pathway. Conclusions These findings support the previous notion that certain bisphosphonates may be useful as adjunctive therapies to potentially ameliorate progression of cartilage degeneration and improve arthritis management.

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