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Objectives: This study aimed to observe the change of arachidonic acid-induced platelet aggregation rate (AA-Ag) and short-term adverse reactions after taking 50 or 100 mg/d aspirin(enteric-coated sustained-release formulation) or 100 mg/d aspirin (enteric-coated aspirin tablet)in the elderly Chinese population (aged 60 years or older). Methods: A total of 1 194 participants aged 60 or older, who should be recommended to take aspirin therapy due to medical reasons, were recruited and randomly assigned into three groups to receive enteric-coated sustained-release aspirin tablet (50 mg, once daily, group A), or 100 mg, once daily (group B) or enteric-coated aspirin tablet 100 mg once daily (group C), respectively. AA-Ag was measured after (14±3)days of aspirin treatment. Adverse events and bleeding events were recorded during the (28±3)days of follow-up. Results: The AA-Ag in group A (n=347), B (n=338) and C (n=332) post 14-day aspirin therapy were 6.65 (4.03,10.84)%, 5.89(3.22,10.03) % and 6.00(3.68,10.09) %, respectively (P>0.05). During the 28 days follow-up, the adverse events rate of group A (n=388), B (n=387) and C (n=385) was 3.87%,3.36%, and 7.95%, and the mild bleeding events rate was 3.09%, 2.33%, and 6.23%, respectively. Adverse events rate and mild bleeding events rate were significantly higher in group C than in group A and B (P<0.05). Conclusions: Compared with 100 mg-dose aspirin, 50 mg-dose aspirin achieves similar anti-platelet aggregation effect in this elderly Chinese population. The short-term adverse events and mild bleeding risk of aspirin with enteric-coated sustained-release formulation were fewer than that of enteric-coated formulation.
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<p><b>OBJECTIVE</b>To observe the influence of either alone or combined mixed-tocopherols combined with eicosapentaenoic acid (EPA) and α-Tocopherol use on oxidized LDL (oxLDL) induced 8-hydroxy-2'-deoxyguanosine (8-OHDG) and interleukin-6 (IL-6) secretion by human umbilical vein endothelial cells (HUVECs) and to explore the potential mechanism.</p><p><b>METHOD</b>Cultured HUVECs in vitro were incubated with oxLDL, oxLDL + α-tocopherol, oxLDL + mixed-tocopherols, oxLDL + EPA, oxLDL + α-tocopherol + EPA, oxLDL + mixed-tocopherols + EPA for 24 hours, respectively. Secretion of 8-OHDG and IL-6 were detected by cell enzyme linked immunosorbent assay (ELISA). The expressions of superoxide dismutase (SOD), protein kinase C-δ (PKC-δ), phosphorylated PKC-δ (p-PKC-δ) were analyzed by Western blot.</p><p><b>RESULTS</b>8-OHDG and IL-6 secretion of HUVECs was significantly increased significantly after incubated with oxLDL for 24 hours which could be significantly attenuated in the presence of tocopherols and EPA (alone or in combination, all P < 0.05) while the strongest inhibition effects were seen with combined use of mixed-tocopherols and EPA. Moreover, combination of mixed-tocopherols and EPA could also significantly increase SOD activity and decrease PKC activity (all P < 0.05). However, the protein expression of SOD and PKC-was similar among groups.</p><p><b>CONCLUSION</b>Combined mixed-tocopherols + EPA use enhanced the inhibiting effects on the secretion of 8-OHDG and IL-6 in oxLDL stimulated HUVECs which might be linked with increased SOD activity and reduced p-PKC activity.</p>