其它天然蛋白

2021-07-23【medicalnews】天然蛋白可抑制小鼠致死性脑癌

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http://www.medicalnewstoday.com/medicalnews.php?newsid=58498

NaturalProteinStopsDeadlyHumanBrainCancerInMice


ScientistsfromJohnsHopkinsandfromtheUniversityofMilanhaveeffectivelyproventhattheycaninhibitlethalhumanbraincancersinmiceusingaproteinthatselectivelyinducespositivechangesintheactivityofcellsthatbehavelikecancerstemcells.ThereportispublishedinNature.

Themostcommontypeofbraincancer-glioblastoma-ismarkedbythepresenceofthesestem-cell-likebraincells,which,insteadoftriggeringthereplacementofdamagedcells,formcancertissue.Stemcells,unlikeallothercellsinthebody,arecapableofformingalmostanykindofcellwhentheright"signals"triggertheirdevelopment.

Fortheirtreatmentexperiment,theresearchersreliedonaclassofproteins,bonemorphogenicproteins,thatcauseneuralstem-cell-likeclusterstolosetheirstemcellproperties,whichinturnstopstheirABIlitytodivide.

Firsttheypretreatedhumanglioblastomacellswithbonemorphogenicprotein4(BMP4),theninjectedthesetreatedcellsintomousebrains.Inmiceinjectedwithcellsthatwerenotpretreated,large,invasivecancersgrew.InthemicewithBMP4-treatedcells,nocancersgrewatall.Threetofourmonthsafterinjection,allmicethatgotuntreatedcellsdied,andnearlyallmicewithBMP4-treatedcellswerealive.

Next,thescientistsdeliveredslow-releaseBMP4-containing"beads"directlyintomousebrainswithimplantedglioblastomacells.Micethatgotemptybeadsdevelopedlargemalignanttumorsanddied.MicewithBMP4beadssurvivedmuchlonger,and80percentsurvivedfourmonthsaftercancercellimplants.

"OurideaistotreatpatientswithBMP4orsomethinglikeitrightaftersurgerytoremoveglioblastomainhopesofpreventingtheregrowthofthecancerandimprovingsurvivaltime,"saysAlessandroOlivi,M.D.,directoroftheDivisionofNeurosurgicalOncologyatHopkinsandacontributortothestudy.

OlivisaysclinicalstudiesusingBMP4couldbeginwithinayearand,ifsuccessful,drugtherapiescouldbeavailabletothepublicwithinthreetofouryears.

"ThiswasproofoftheideathatBMPscouldstopglioblastomabydepletingthestem-cell-likepopulationthatfeedsit,"saysHenryBrem,M.D.,chairmanoftheDepartmentofNeurosurgeryatHopkinsandacollaboratorinthestudy."Thisopensexcitingdoorstofutureresearchintotreatmentsandtherapiesforsuchadevastatingdisease."
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NaturalProteinStopsDeadlyHumanBrainCancerInMiceScientistsfromJohnsHopkinsandfromtheUniversityofMilanhaveeffectivelyproventhattheycaninhibitlethalhumanbraincancersinmiceusingaproteinthatselectivelyinducespositivechangesintheactivityofcellsthatbehavelikecancerstemcells.ThereportispublishedinNature.来自约翰霍普金斯和米兰大学的科学家,有效地证明了他们可使用一种蛋白质,在小鼠身上抑制致死性人的脑癌,这种蛋白质选择性地在表现为癌干细胞特性的细胞中引起阳性改变。Themostcommontypeofbraincancer-glioblastoma-ismarkedbythepresenceofthesestem-cell-likebraincells,which,insteadoftriggeringthereplacementofdamagedcells,formcancertissue.Stemcells,unlikeallothercellsinthebody,arecapableofformingalmostanykindofcellwhentheright"signals"triggertheirdevelopment.最常见的类型的脑癌即恶性胶质瘤以出现类似癌干细胞的脑细胞为特征,这些细胞不是替代损伤细胞,而是形成肿瘤。干细胞不象身体内的其他细胞,当信号触发它的进化时,它可形成任何种类的细胞。Fortheirtreatmentexperiment,theresearchersreliedonaclassofproteins,bones,thatcauseneuralstem-cell-likeclusterstolosetheirstemcellproperties,whichinturnstopstheirABIlitytodivide.研究者使用一类蛋白质-骨形态发生蛋白用于他们的治疗实验。该蛋白引起神经干细胞样细胞丢失它们干细胞特性,继而阻止它们分裂的能力。Firsttheypretreatedhumanglioblastomacellswithbonemorphogenicprotein4(BMP4),theninjectedthesetreatedcellsintomousebrains.Inmiceinjectedwithcellsthatwerenotpretreated,large,invasivecancersgrew.InthemicewithBMP4-treatedcells,nocancersgrewatall.Threetofourmonthsafterinjection,allmicethatgotuntreatedcellsdied,andnearlyallmicewithBMP4-treatedcellswerealive.首先他们用骨形态发生蛋白4(BMP4)预处理人恶性胶质瘤细胞,然后把这些处理细胞注射到小鼠脑内。注射没有预处理细胞的小鼠脑内,可见大的浸润性的癌肿生长,而使用BMP4处理的细胞的小鼠,根本就没有肿瘤生长。注射后3-4个月,注射没有处理细胞的小鼠全部死亡,而注射BMP4处理细胞的小鼠几乎全部存活。Next,thescientistsdeliveredslow-releaseBMP4-containing"beads"directlyintomousebrainswithimplantedglioblastomacells.Micethatgotemptybeadsdevelopedlargemalignanttumorsanddied.MicewithBMP4beadssurvivedmuchlonger,and80percentsurvivedfourmonthsaftercancercellimplants.接着,科学家将含有缓慢释放BMP4的粒子直接送达植入恶性胶质瘤细胞的小鼠脑内。注射空粒子的小鼠长出大的恶性肿瘤而死亡。注射BMP4粒子的小鼠生存时间长得多,癌细胞植入后,80%小鼠活到4个月。"OurideaistotreatpatientswithBMP4orsomethinglikeitrightaftersurgerytoremoveglioblastomainhopesofpreventingtheregrowthofthecancerandimprovingsurvivaltime,"saysAlessandroOlivi,M.D.,directoroftheDivisionofNeurosurgicalOncologyatHopkinsandacontributortothestudy.“我们的想法是,手术切除恶性胶质瘤后,使用BMP4或其它什么的治疗患者,希望预防癌肿的复发,延长患者的生存期”霍普金斯肿瘤神经外科主任,该研究作者AlessandroOlivi博士说。OlivisaysclinicalstudiesusingBMP4couldbeginwithinayearand,ifsuccessful,drugtherapiescouldbeavailabletothepublicwithinthreetofouryears.Olivi博士说,使用BMP4的临床研究年内可以开始,如果成功,药物治疗3-4年内可以可以大众使用。"ThiswasproofoftheideathatBMPscouldstopglioblastomabydepletingthestem-cell-likepopulationthatfeedsit,"saysHenryBrem,M.D.,chairmanoftheDepartmentofNeurosurgeryatHopkinsandacollaboratorinthestudy."Thisopensexcitingdoorstofutureresearchintotreatmentsandtherapiesforsuchadevastatingdisease."“BMP可通过减少干细胞样细胞数量阻止恶性胶质瘤,该想法得到证明。它打开了治疗这些破坏性疾病进一步研究的令人兴奋的大门。”霍普金斯肿瘤神经外科主席,该研究得合作者HenryBrem博士说。

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来自约翰霍普金斯和米兰大学的科学家,有效地证明了使用一种蛋白质,可抑制小鼠体内致死性人脑癌的生长,这种蛋白选择性地引起癌干细胞样细胞发生阳性改变。该研究发表于自然杂志上。脑癌最常见的类型是恶性胶质瘤,它以有癌干细胞样的脑细胞为特征,这些细胞不是替代损伤细胞,而是形成肿瘤。干细胞与身体内的其他细胞不同,当信号触发它分化,它可形成各种类型的细胞。研究者使用骨形态发生蛋白用于治疗实验。该蛋白引起神经干细胞样细胞丢失它们干细胞特性,继而阻止它们分裂的能力。首先他们用骨形态发生蛋白4(BMP4)预处理人恶性胶质瘤细胞,然后把这些处理细胞注射到小鼠脑内。注射没有预处理的细胞,在小鼠脑内,可见大的浸润性的癌肿生长,而使用BMP4处理的细胞的小鼠,根本就没有肿瘤生长。注射后3-4个月,注射没有处理细胞的小鼠全部死亡,而注射BMP4处理细胞的小鼠几乎全部存活。接着,科学家将含有缓慢释放BMP4的粒子直接送达植入恶性胶质瘤细胞的小鼠脑内。注射空粒子的小鼠长出大的恶性肿瘤而死亡。注射BMP4粒子的小鼠生存时间长得多,癌细胞植入后,80%小鼠活到4个月。“我们的想法是,手术切除恶性胶质瘤后,使用BMP4等治疗,以预防癌肿的复发,延长患者的生存期”霍普金斯肿瘤神经外科主任,该研究作者AlessandroOlivi博士说。Olivi博士认为,BMP4的临床研究年内可以开始,如果成功,3-4年内可以可以推广使用。“BMP可通过减少干细胞样细胞数量阻止恶性胶质瘤生长,它打开了治疗这些破坏性疾病进一步研究的大门。”霍普金斯肿瘤神经外科主席,该研究得合作者HenryBrem博士说。