Inflammatory cytokines induce specific time- and concentration-dependent MicroRNA release by chondrocytes, synoviocytes, and meniscus cells.
In knee osteoarthritis (OA), concentrations of interleukin (IL)-1β and tumor necrosis factor (TNF)-α increase in joint tissues and synovial fluid which incite a catabolic cascade and further the progression of OA. Several microRNAs (miRNA) have been associated with apoptosis (miR-16), inflammation (miR-22, miR-146a), and matrix degradation (miR-140, miR-27b) in developed OA or its symptoms. In this study, the time- and concentration-dependent nature of cellular and extracellular miRNAs in synoviocytes, meniscus cells, and chondrocytes as influenced by inflammatory cytokines was investigated. For time-dependent studies, three cell types were stimulated with 10 ng/ml IL-1β or 50 ng/ml TNF-α for 8, 16, and 24 h. For concentration-dependent studies, chondrocytes were stimulated with a higher level of IL-1β (20 ng/ml) or TNF-α (100 ng/ml) for 8 h. Cellular and extracellular expressions of miR-22, miR-16, miR-146a, miR-27b, and miR-140 were analyzed by RT-PCR. Time-dependent cellular miRNA expressions were similar across the three cell types with miR-146a significantly up-regulated and miR-27b significantly down-regulated at all time points. However, chondrocytes exhibited a unique extracellular miRNA profile with an increased release rate of miR-27b at 24 h. Our findings support further research into the characterization of miRNAs in synovial fluid for the development of early detection strategies of OA or cartilage injury. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:779-790, 2016.
Department of Biomedical Engineering, College of Engineering, University of Miami, Coral Gables, Florida.
Amaris A
AA
Genemaras
Department of Orthopedics, Division of Sports Medicine, University of Miami Miller School of Medicine, Miami, Florida.
Hayley
H
Ennis
Department of Biomedical Engineering, College of Engineering, University of Miami, Coral Gables, Florida.
Lee
L
Kaplan
Department of Biomedical Engineering, College of Engineering, University of Miami, Coral Gables, Florida.
Chun-Yuh
CY
Huang
D000818:Animals; D002478:Cells, Cultured; D019902:Chondrocytes / Q000378:metabolism*; D053583:Interleukin-1beta; D008592:Menisci, Tibial / Q000166:cytology / Q000378:metabolism*; D035683:MicroRNAs / Q000378:metabolism*; D010003:Osteoarthritis / Q000378:metabolism*; D013552:Swine; D000070918:Synoviocytes / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha
D053583:Interleukin-1beta; D035683:MicroRNAs; D014409:Tumor Necrosis Factor-alpha
chondrocytes; inflammatory cytokines; microRNA; osteoarthritis