growth activation , using insulin or platelet-derived growth factor , led to dose-dependent increases in cellular ldl receptor mrna level ( average 5.2-fold increase at 10 ng/ml platelet-derived growth factor , 4.1-fold increase at 58 ng/ml insulin ) and cell surface expression ( average 3.5-fold increase at 10 ng/ml platelet-derived growth factor , 2.5-fold increase at 58 ng/ml insulin ) .
C0007634
cellular
C0699040
cell surface