Figure 4
FFA and lactate enhance production of proinflammatory cytokines and VEGF via HIF1α in mouse chondrocytes.
(a) Immunoblotting assay of HIF1α in primary chondrocytes transfected with a scramble siRNA (siNC, 20 nM), a mouse HIF1α specific siRNA1 (siH-1, 20 nM) or siRNA2 (siH-2, 20 nM) for 36 h. (b~e) Relative mRNA levels of IL-6 (b), TNF-α (c), IL-1β (d) and VEGF (e) in the mouse primary chondrocytes transfected with siNC (20 nM), siH-1 (20 nM) or siH-2 (20 nM)for 12 h plus additional treatment with BSA (5%) or FFA (200 μM) for 24 h. Values not sharing a common superscript letter differ significantly. (n = 3, P < 0.05). (f~i) Relative mRNA levels of IL-6 (f), TNF-α (g), IL-1β (h) and VEGF (i) in the mouse primary chondrocytes transfected with siNC (20 nM), siH-1 (20 nM) or siH-2 (20 nM) for 12 h plus additional treatment with lactate (25 mM) or vehicle control for 24 h. Values not sharing a common superscript letter differ significantly. (n = 3, P < 0.05).
