Comparison of Pathophysiological Mechanisms Among Crystal-Induced Arthropathies

Monosodium urate, calcium pyrophosphate, and basic calcium phosphate crystals are the most common types of crystals found in the joints. Each type of crystal has been associated with the onset of different joint diseases. However, the mechanisms identified for one type of crystal are often generalized to the others; thus, overlooking the specific and distinct molecular and cellular responses activated by each type of crystal. This review describes the similarities and differences of the main molecules and mechanisms underlying the diseases associated with the three different types of crystals. Specifically, current knowledge on crystal properties and formation, on the induction and resolution of inflammation, on mechanisms involved in pain processing and senescence, and on the role of mitochondria and genomic instability are elucidated. A more complete and detailed study of the specific molecular mechanisms induced by different crystals is necessary to advance our understanding of the pathogenesis and to help identify innovative opportunities for prevention and treatment of crystal deposition disease.