RNA was extracted from cartilage explants and synoviocytes as previously described [33 (link)]. Total RNA concentration was determined using a Nanodrop-2000c (Thermo Fisher Scientific). Complimentary DNA (cDNA) was prepared [33 (link)]. Real-time qPCR was used to measure relative gene expression for markers of three pro-inflammatory cytokines: Interleukin 1 beta (IL1β), Interleukin 6 (IL6) and Tumour Necrosis Factor alpha (TNFα) compared to the reference gene glyceraldehydes-3-phosphatedhyrogenase (GAPDH) as described previously using SYBR Green technology [33 (link)]. Primer sequences are listed in Table 2.

Primer sequences of the reference gene (GAPDH) and pro-inflammatory cytokines IL1β, IL6 and TNFα used in the study

GeneGeneBank AccessionDirectionPrimer Sequence (5′-3′)
GAPDHNM_001163856ForwardGCATCGTGGAGGGACTCA
ReverseGCCACATCTTCCCAGAGG
IL-1βNM_001317261ForwardGCCTAAGAATACTACATCCAGAGA
ReverseGGCATTGATTAGACAACAGTGAA
IL-6NM_001082496ForwardCTGCTCCTCGTGATGGCTAC
ReverseCCGAGGATGTACTTAATGTGCTG
TNF-αNM_001081819ForwardCCTTCCACTCAATCAACCCTCT
ReverseCACGCCCACTCAGCCACT

Primer sequences of the reference gene (GAPDH) and proinflammatory cytokines IL1β, IL6 and TNFα used in the study

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