title: Anti-inflammatory effects of continuous passive motion on meniscal fibrocartilage.
abstract: Motion-based therapies have been applied to promote healing of arthritic joints. The goal of the current study was to determine the early molecular events that are responsible for the beneficial actions of motion-based therapies on meniscal fibrocartilage. Rabbit knees with Antigen-Induced-Arthritis (AIA) were exposed to continuous passive motion (CPM) for 24 or 48 h and compared to immobilized knees. The menisci were harvested and glycosaminoglycans (GAG), interleukin-1beta (IL-1beta), matrix metalloproteinase-1 (MMP-1), cyclooxygenase-2 (COX-2), and interleukin-10 (IL-10) were determined by histochemical analysis. Within 24 h, immobilized knees exhibited marked GAG degradation. The expression of proinflammatory mediators MMP-1, COX-2, and IL-1beta was notably increased within 24 h and continued to increase during the next 24 h in immobilized knees. Knees subjected to CPM revealed a rapid and sustained decrease in GAG degradation and the expression of all proinflammatory mediators during the entire period of CPM treatment. More importantly, CPM induced synthesis of the anti-inflammatory cytokine IL-10. The results demonstrate that mechanical signals generated by CPM exert potent anti-inflammatory signals on meniscal fibrochondrocytes. Furthermore, these studies explain the molecular basis of the beneficial effects of CPM observed on articular cartilage and suggest that CPM suppresses the inflammatory process of arthritis more efficiently than immobilization.
authors.affiliation: Department of Oral Biology, The Ohio State University, Columbus, OH 43210, USA.
authors.forename: Mario
authors.initials: M
authors.lastname: Ferretti
authors.forename: Abiraman
authors.initials: A
authors.lastname: Srinivasan
authors.forename: James
authors.initials: J
authors.lastname: Deschner
authors.forename: Robert
authors.initials: R
authors.lastname: Gassner
authors.forename: Frank
authors.initials: F
authors.lastname: Baliko
authors.forename: Nicholas
authors.initials: N
authors.lastname: Piesco
authors.forename: Robert
authors.initials: R
authors.lastname: Salter
authors.forename: Sudha
authors.initials: S
authors.lastname: Agarwal
mesh_terms: D000818:Animals; D001169:Arthritis, Experimental / Q000378:metabolism / Q000628:therapy*; D002356:Cartilage / Q000378:metabolism*; D051546:Cyclooxygenase 2; D006025:Glycosaminoglycans / Q000032:analysis; D007375:Interleukin-1 / Q000032:analysis; D016753:Interleukin-10 / Q000096:biosynthesis; D008297:Male; D020781:Matrix Metalloproteinase 1 / Q000032:analysis; D008592:Menisci, Tibial / Q000378:metabolism*; D015915:Motion Therapy, Continuous Passive; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis; D011817:Rabbits
chemical_list: D006025:Glycosaminoglycans; D007375:Interleukin-1; D016753:Interleukin-10; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases; D020781:Matrix Metalloproteinase 1