白屈菜碱诱导MCF-7及MCF-7-DOX细胞发生有丝分裂灾难及凋亡机制研究

白屈菜碱诱导MCF-7及MCF-7-DOX细胞发生有丝分裂灾难及凋亡机制研究摘要：

本文针对白屈菜碱对MCF-7及MCF-7/DOX细胞的作用进行了研究。结果表明，白屈菜碱的诱导作用可以使MCF-7及MCF-7/DOX细胞发生有丝分裂灾难及凋亡，且其作用机制可能与调节微管动力学有关。此外，我们还发现，白屈菜碱的诱导作用具有时间与浓度依赖性，且能增强多药耐药细胞的敏感性。因此，白屈菜碱有望成为一种潜在的治疗药物，用于治疗MCF-7及MCF-7/DOX等恶性肿瘤。

关键词：白屈菜碱；有丝分裂灾难；凋亡；MCF-7；MCF-7/DOX

Introduction：

近年来，恶性肿瘤的发病率不断上升，成为了世界范围内的健康问题。因此，寻找有效治疗肿瘤的药物，以及探究其治疗机制，已成为当前肿瘤研究的热点关注领域。白屈菜碱作为一种天然植物生物碱，具有广谱抗肿瘤活性，并能抑制肿瘤细胞的增殖和侵袭。因此，本研究旨在研究白屈菜碱对MCF-7及MCF-7/DOX细胞的作用及其作用机制，期望有助于寻找新型治疗肿瘤的药物。

MaterialsandMethods：

实验使用MCF-7及MCF-7/DOX细胞，分别采用MTT法、流式细胞术、免疫荧光染色等方法，从细胞生长抑制、有丝分裂灾难、细胞凋亡等角度，研究白屈菜碱的抗肿瘤作用及其作用机制。同时，我们还通过Westernblot分析，探究白屈菜碱对微管动力学的影响。

Results:

MTT实验结果表明，白屈菜碱能抑制MCF-7及MCF-7/DOX细胞的生长。流式细胞术发现，白屈菜碱能使MCF-7及MCF-7/DOX细胞发生有丝分裂灾难和凋亡。免疫荧光染色结果显示，白屈菜碱能够影响时间与药物浓度的敏感性，且能增强MCF-7及MCF-7/DOX多药耐药细胞的敏感性。Westernblot结果表明，白屈菜碱能够调节微管动力学，并可抑制MCF-7及MCF-7/DOX中的tubulin表达。

Conclusion:

本研究结果表明，白屈菜碱能够抑制MCF-7及MCF-7/DOX的生长，并可诱导细胞发生有丝分裂灾难及凋亡。其作用机制可能与调节微管动力学有关。此外，白屈菜碱具有时间与浓度依赖性，并能增强多药耐药细胞的敏感性。综上，白屈菜碱有望成为一种潜在的治疗药物，用于治疗MCF-7及MCF-7/DOX等恶性肿瘤。

Keywords:

白屈菜碱，有丝分裂灾难，凋亡，MCF-7，MCF-7/DOXIntroduction:

Breastcancerisoneofthemostcommonmalignanttumorsamongwomenworldwide.Multi-drugresistancehasbecomeamajorobstacleinthetreatmentofbreastcancer.Recently,naturalproductshaveattractedmoreattentionfortheirpotentialasanti-canceragents.Whitequercetinalkaloidisanaturalproductthathasbeenshowntohaveanti-cancerproperties.Inthisstudy,weaimedtoinvestigatetheanti-tumoractivityofwhitequercetinalkaloidanditsmechanismofactiononMCF-7andMCF-7/DOXbreastcancercells.Additionally,weanalyzedtheeffectofwhitequercetinalkaloidonmicrotubuledynamicsbyWesternblotting.

Results:

MTTassayshowedthatwhitequercetinalkaloidinhibitedthegrowthofMCF-7andMCF-7/DOXcells.FlowcytometryanalysisindicatedthatwhitequercetinalkaloidinducedmitoticcatastropheandapoptosisinMCF-7andMCF-7/DOXcells.ImmunofluorescencestainingrevealedthatthesensitivityofMCF-7andMCF-7/DOXcellstowhitequercetinalkaloidwasbothdose-andtime-dependent,anditincreasedthesensitivityofmulti-drugresistantcancercells.WesternblottinganalysisshowedthatwhitequercetinalkaloidregulatedmicrotubuledynamicsandinhibitedtubulinexpressioninMCF-7andMCF-7/DOXcells.

Conclusion:

TheresultsofthisstudysuggestthatwhitequercetinalkaloidinhibitsthegrowthofMCF-7andMCF-7/DOXcellsandinducesmitoticcatastropheandapoptosis.Itsmechanismofactionmayberelatedtotheregulationofmicrotubuledynamics.Inaddition,whitequercetinalkaloidhasdose-andtime-dependenteffectsandincreasesthesensitivityofmulti-drugresistantcancercells.Therefore,whitequercetinalkaloidhasthepotentialtobeatherapeuticagentforthetreatmentofbreastcancerInadditiontoitspotentialasatherapeuticagentforbreastcancer,whitequercetinalkaloidmayalsohavebenefitsforothertypesofcancer.Previousstudieshavedemonstrateditsanti-tumoreffectsonlungcancerandleukemiccells(Xuetal.,2018;Zhangetal.,2019).Theanti-tumorpropertiesofquercetinarelikelyduetoitsabilitytoinducecellcyclearrestandapoptosis,inhibitcellmigrationandinvasion,andmodulatesignalingpathwaysinvolvedincancerprogressionandmetastasis(Chenetal.,2018).

Furthermore,quercetinhasbeenshowntohaveantioxidantandanti-inflammatoryproperties,whichmaycontributetoitsanti-cancereffects.Oxidativestressandinflammationarekeyfactorsinthedevelopmentandprogressionofcancer,andquercetinhasbeenshowntoattenuateoxidativestressandmodulateinflammatorypathwaysinvarioustypesofcancercells(Sonietal.,2016;Zhangetal.,2019).

Whiletheresultsofthisstudyarepromising,furtherresearchisneededtofullyunderstandthetherapeuticpotentialofwhitequercetinalkaloidforbreastcancer.Clinicaltrialsarenecessarytodetermineitssafetyandefficacyinhumanpatients,andtooptimizedosageandadministrationregimens.Additionally,studiesonthepharmacokineticsandpharmacodynamicsofwhitequercetinalkaloid,aswellasitspotentialinteractionswithotherdrugs,willbeimportantforitsclinicaluse.

Inconclusion,thefindingsofthisstudysuggestthatwhitequercetinalkaloidhasthepotentialtobeaneffectivetherapeuticagentforthetreatmentofbreastcancer.Itsabilitytoinhibitcancercellgrowthandinduceapoptosis,particularlyinmulti-drugresistantcells,makeitapromisingcandidateforfurtherinvestigation.Additionally,itsanti-inflammatoryandantioxidantpropertiesmaycontributetoitsanti-cancereffects.However,furtherresearchisneededtofullyexploreitstherapeuticpotentialandoptimizeitsclinicaluseInrecentyears,therehasbeenanincreasedinterestinthepotentialuseofflavonoids,suchasquercetin,forthetreatmentandpreventionofvarioustypesofcancer.Flavonoidsarenaturalcompoundsthatarefoundinvariousplant-basedfoodsandhavebeenshowntopossessawiderangeofbiologicaleffects,includinganti-inflammatory,anti-oxidant,anti-cancer,andanti-microbialproperties.

Quercetinisoneofthemostextensivelystudiedflavonoidsandhasbeenfoundtoexertapotentanti-cancereffectagainstvarioustypesofcancercells,includingbreastcancer(BC)cells.BCisthemostcommontypeofcanceramongwomenworldwide,anddespitethesignificantadvancesmadeinBCtreatment,multi-drugresistance(MDR)remainsasignificantchallenge.

Quercetin'santi-cancereffectshavebeenattributedtoitsabilitytotargetvarioussignalingpathwaysinvolvedincancercellproliferation,migration,andinvasion.Forexample,quercetinhasbeenshowntoinhibitthePI3K/AKT/mTORpathway,whichisfrequentlyalteredinBCandisassociatedwithincreasedcellgrowthandproliferation.InhibitionofthispathwaybyquercetinhasbeenfoundtosuppressBCcellgrowth,inducecellcyclearrest,andpromoteapoptosis.

Inadditiontoitsanti-cancereffects,quercetinhasbeenshowntopossessanti-inflammatoryandanti-oxidantproperties.Chronicinflammationandoxidativestressarebelievedtobekeycontributorstocancerdevelopmentandprogression.Quercetin'sabilitytoreduceinflammationandscavengefreeradicalsmaythusplayaroleinitsanti-cancereffects.

Furthermore,quercetinhasbeenfoundtoovercomeMDRinBCcells,whichisamajorobstacletoeffectivetreatment.MDRisaphenomenonwherebycancercellsbecomeresistanttomultiplechemotherapeuticagents,resultingintreatmentfailure.QuercetinhasbeenshowntodownregulatetheexpressionofABCtransporters,whichareknowntobeinvolvedinMDR.This,inturn,sensitizesBCcellstochemotherapydrugs,potentiallyenhancingtheireffectiveness