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华西医学  2011 

纳米银体外抗H3N2流感病毒作用及其机制初步探讨

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Keywords: 纳米银,H3N2流感病毒,抗病毒作用,作用机制?

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Abstract:

【】 目的 研究纳米银体外抗H3N2流感病毒的作用,并初步探索其作用机制。 方法 在H3N2流感病毒吸附细胞后加入纳米银和吸附前用纳米银预处理犬肾细胞(MDCK),在体外用细胞病变效应(cytopathiceffect,CPE)观察法和3-(4,5-二甲基-2-噻唑)-2,5-二苯基溴化四唑(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide,MTT)测值法,分析纳米银对H3N2流感病毒感染MDCK细胞的预防作用、直接灭活作用以及对流感病毒子代病毒体生成的抑制作用,运用RT-PCR法研究纳米银对H3N2流感病毒HA基因复制的干扰作用。 结果 纳米银能明显杀伤H3N2流感病毒,50、25μg/mL的纳米银溶液与H3N2流感病毒充分作用2h后感染MDCK细胞,细胞存活率分别为94.38%和92.17%,纳米银能有效抑制流感病毒对MDCK细胞的侵入和侵入后病毒的继续增殖,25μg/mL纳米银溶液通过上述两种方式处理细胞,细胞存活率分别为85.39%和83.28%,与病毒对照组相比,差异均有统计学意义(P<0.001);400、200μg/mL纳米银溶液分别与流感病毒H3N2充分混合作用15、30、60、120min后,病毒液的HA基因均未能成功扩增,纯病毒液和溶剂对照组在1700bp处均出现明显条带。 结论 通过3种不同的给药方式,纳米银在体外均能明显抑制流感病毒对细胞的感染,纳米银抑制流感病毒的机制可能是通过干扰H3N2流感病毒和吸附、穿入和基因的复制,从而抑制子代病毒体的生成。?【Abstract】 Objective Toexploretheanti-viraleffectsofsilver-nanoparticles(silver-nps)onH3N2influenzavirusinvitroandtoevaluateitsmechanism. Methods Silver-npswasaddedtocaninekidneycells(MDCK)beforeandafterthecellswasadsorptedbyH3N2influenzavirus.Cytopathiceffect(CPE)assayandthe3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide(MTT)assaywereusedtoanalyzethepreventiveeffect,directlyoffdeactivation,andtheinhibitformationofprogenyvirionsofsilver-npsonH3N2viruses.TheinterferenceofHAgenereplicationwasobservedbytheRT-PCRassay. Results ThesurvivalrateofMDCKcellswas94.38%and92.17%after50and25μg/mLsilver-npsweremixedwith100TCID?50H3N2virusin2hours,andthesurvivalrateofMDCKcellswas85.39%and83.28%beforeandafterthecellswasadsorptedbyH3N2influenzaviruswhen25μg/mLsilver-npswasaddedtothecells(allcomparedtoviruscontrol,P<0.001),whichshowedthatsilver-npscouldinactivateH3N2virus,preventetheminvasingtothecellsandreproductingwhenH3N2enteredthecellremarkedly.TheHAgenewasnotamplifiedsuccessfullywhen50and25μg/mLsilver-npsweremixedwith100TCID50H3N2virusin15,30,60,and120minuteslater,butbothpurevirussolutionandsolventcontrolgroupappearedasignificantbrightbandinthe1700bparea. Conclusion Underthreedifferentadministrationmodes,silver-npshasanobviouseffectagainstH3N2invitro,whichcouldinterferetheHAgenereplicationandinhibittheformationofH3N2progenyvirions.

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