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1、靶向肝脾巨噬細(xì)胞治療血小板減少性紫癜的實(shí)驗研究【摘要】本研究制備兔抗鼠血小板血清以建立SD大鼠免疫性血小板減少性紫癜(ITP)模型,使用明膠微粒裝載二氯亞甲基二膦酸(Cl2MDP),并將藥物導(dǎo)向模型的肝脾巨噬細(xì)胞內(nèi)以殺傷巨噬細(xì)胞或降低其免疫活性,以期達(dá)到治療ITP的目的。每24小時重復(fù)注射1次抗血小板血清150μl,所建立的SD大鼠的ITP模型中,血小板計數(shù)于實(shí)驗期間能維持在低于50×109/L的病理水平。用Cl2MDP明膠微粒進(jìn)行巨噬細(xì)胞株RAW264.7的MTT試驗及模型的實(shí)驗性治療,以治療前后的血小板計數(shù)和出血時間作為療效的觀察指標(biāo)。結(jié)果表明:Cl2MDP
2、明膠微粒呈劑量依賴關(guān)系抑制體外培養(yǎng)的巨噬細(xì)胞的增殖并可迅速、有效地升高模型鼠血小板的數(shù)量,平均達(dá)180×109/L水平,并能維持血小板計數(shù)在生理范圍內(nèi)而不下降。此外,預(yù)先注射Cl2MDP明膠微粒的SD大鼠可避免抗血小板血清引起的血小板計數(shù)降低。結(jié)論:Cl2MDP明膠微粒靜脈注射可以有效地提高SD大鼠ITP模型的血小板數(shù)量,達(dá)到避免發(fā)生出血的安全水平。這種靶向巨噬細(xì)胞的藥物輸送技術(shù)為ITP的治療提供了一種新的治療理念和方法,值得進(jìn)一步深入研究。【關(guān)鍵詞】免疫性血小板減少性紫癜二氯亞甲基二膦酸鹽明膠微粒巨噬細(xì)胞靶向治療ExperimentalStudyforThro
3、mbocytopenicPurpuraTherapybyTargetingMacrophagesinLiverandSpleenAbstractThestudypurposewastoexplorewhetherdichloromethylenediphosphonate(Cl2MDP)loadedgelatinparticlescaninducethedepletionofmacrophageinreticuloendothelialsystemofliverandspleenorcandepresstheimmunityofmacrophageinSDratm
4、odelsofimmunethrombocytopenicpurpura(ITP)totreattheITPrats.NewZealandrabbitswereimmunizedwithplateletsofSDratstopreparerabbitantiratplateletserum,andtheserumwasintravenouslyinjectedintoSDratstoproducetheITPmodel.InexperimentalITPmodels,150μlofantiplateletserumwasintravenouslyinjected
5、intoSDratsper24hours.Theplateletcountsmaintainedpathologicallevelandwerepersistentlylessthan50×109/Linthemodelsduringexperimentprocess.TheMTTtestofmacrophageRAW264.7wascarriedoutbymeansofCl2MDPloadedgelatinparticlesinvitro.AfterintravenousinjectionofagroupdoseofCl2MDPgelatinparticles
6、,theplateletcountsoftheratsweremeasuredatthetimeof4hours,24hours,48hours,72hoursand96hours,respectively,andbleedingtimesweredetectedin24hours.TheresultsshowedthatCl2MDPloadedgelatinparticlesincreasedtheplateletcountsofITPmodelstomeanof180×109/L,aphysiologicallevelin24hoursafterinjecti
7、on,andkeptthis8plateletlevelthroughwholeprocessof120hours.Furthermore,ratspretreatedwithCl2MDPloadedgelatinparticlesavoidedthedecreaseofplateletcountssignificantlywhentheywereinjectedantiplateletserum.ItisconcludedthatCl2MDPloadedgelatinparticlesrestrainmultiplicationofmacrophage