Fig. 4From: Vascular endothelial growth factor expression and their action in the synovial membranes of patients with painful knee osteoarthritisEffect of VEGF on apelin mRNA expression. qPCR analysis for apelin. Synovial membrane cells were stimulated with 10 or 100 ng/mL human recombinant VGEF or vehicle for 24 h preceding the extraction and analysis of apelin mRNA. All data are shown as the mean ± standard error (n = 6). *P < 0.05Back to article page