Figure 5From: Discoidin domain receptors regulate the migration of primary human lung fibroblasts through collagen matricesNormal human lung fibroblast (NHLF) proliferation is discoidin domain receptor (DDR)2, but not DDR1 dependent. NHLFs were reverse transfected with DDR2-, DDR1-specific small interfering (si)RNA or negative control siRNA using lipofectamine RNAiMAX. At 48 h after transfection, NHLFs where transferred to a 96-well black walled plate at 3,000 cells/well. Cells were serum-starved for 24 h and incubated with collagen I (25 μg/mL) or vehicle (acetic acid, 0.1 M) for an additional 16 h. Cell proliferation was determined using the DELFIA proliferation assay kit and measuring time-resolved fluorescence at 340 nm excitation and 615 nm emission. Results are representative of mean fold increase ± SD of two independent experiments performed in triplicate (n = 6, **P < 0.01).Back to article page