Basic calcium phosphate crystals and osteoarthritis pathogenesis: novel pathways and potential targets

Area of Science:

• Rheumatology
• Crystal-induced arthropathies
• Osteoarthritis pathogenesis

Background:

• Basic calcium phosphate (BCP) crystals are implicated in osteoarthritis (OA) development.
• Expanding knowledge of BCP crystals in OA pathogenesis fuels targeted therapy research.

Purpose of the Study:

• To review recent advances in understanding the role of BCP crystals in OA pathogenesis.
• To summarize current knowledge on BCP crystal involvement in OA.

Main Methods:

• Review of recent scientific literature on BCP crystals and OA.
• Discussion of experimental evidence, including animal models.
• Highlighting advancements in diagnostic tools like dual-energy computerized tomography (DECT).

Main Results:

• BCP crystal injection in mice induces OA-like changes, confirming their pathogenic role.
• Interleukin-6 (IL-6) is identified as a key cytokine in BCP crystal-induced inflammation.
• BCP crystal-induced osteoclastogenesis is explored as a therapeutic target.
• DECT is a valuable noninvasive tool for quantifying intra-articular BCP crystal deposition.

Conclusions:

• BCP crystals activate inflammatory pathways leading to cartilage degradation and OA.
• Understanding these pathways may lead to novel targeted OA therapies.
• Current targeted therapies for BCP crystal-mediated OA are lacking.