Native apolipoprotein E from human plasma. A component of VLDL and of a subclass of HDL. Present in normal plasma at concentrations of 50 µg/ml. Serves as a ligand for LDL receptors, where it participates in the transport and redistribution of cholesterol and other lipids. Also functions in immunoregulation and cell growth differentiation. Inhibits mitogen-induced T-lymphocyte proliferation and modulation of smooth muscle cell differentiation.
