FIGURE 2.

HDL protects HUVEC and BAEC from multiple apoptogenic triggers, whereas MPO-oxidized HDL fails to do so. A, HUVEC were placed in serum-free medium along with the indicated treatments for 6 h. B, apoptosis was quantified by either annexin positive staining by flow cytometry or TUNEL staining. C and D, HUVEC and BAEC were exposed to 254-nm UV irradiation for 10 min followed by incubation with the indicated treatments for 6 h. Apoptosis was quantified by TUNEL staining. The results represent the means of triplicate determinations of a representative experiment performed at least three times.