HDL from patients on PD and HD exhibited impaired antiaggregant properties. (A) Regarding levels of TxB2, HD and PD HDL triggered overactivation of platelets compared with control HDL (n=15 for control, n=25 for HD group, and n=20 for PD group). (B) The same observations were found for healthy volunteers’ HDL modified by an incubation overnight with HNE (HNE HDL, n=5 for each group). (C) HD, PD, and HNE HDL exhibited blunted antiaggregant properties compared with control HDL (n=9 for control and HD groups, n=5 for HNE group). (D) We found a threshold effect of HNE modification on HDL because only a 100 µM solution of HNE permitted the significant alteration of the antiaggregant properties of control HDL (n=4 for each group). *P<0.05, Mann–Whitney test and Kruskal–Wallis test (in D). Data are expressed as median and interquartile range.