PMID: 9650887Jul 3, 1998Paper

Molecular weight-dependent effects of hyaluronate on the arthritic synovium

Archives of Histology and Cytology
A AsariY Uchiyama

Abstract

Intra-articular injection of hyaluronate (HA) is widely used in the treatment of arthropathies. However, the mechanism of the effects of HA preparations on the arthritic synovium and the relationship between their effects and molecular weights (MW) remains unknown. The objectives of this study were to compare the effects of two hyaluronate preparations, HA84 (MW: 84 X 10(4)) and HA230 (MW: 230 X 10(4)), on the synovium of an arthritis model and to examine the mechanism of the effects of HA. The HA preparations were intra-articularly injected in a model of canine arthritis induced by anterior cruciate ligament transection for a total trial of 5 weeks. To define the accessibility of HA preparations to the synovial lining layers, fluorescein-labeled HA84 or HA230 was injected at the last administration. Pathological changes analyzed included increases in volumes and prostaglandin E2 concentrations in synovial fluids, thickening of the synovial lining layers, vacuolar alterations in the lining cells, and stainability of HA in the synovium. Expression levels of Heat shock protein 72 (Hsp72) were immunohistochemically detected in the tissues to investigate the ability of the cells to survive the degeneration. The pathological changes...Continue Reading

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