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《醫(yī)學(xué)論文-放射損傷對外源骨髓間充質(zhì)干細(xì)胞遷徙定植的影響》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、醫(yī)學(xué)論文-放射損傷對外源骨髓間充質(zhì)干細(xì)胞遷徙定植的影響【摘要】?研究機(jī)體中樞神經(jīng)系統(tǒng)受放射損傷時(shí)骨髓間充質(zhì)干細(xì)胞(MSCs)的遷徙定植特性的改變,從而為應(yīng)用MSCs治療中樞神經(jīng)系統(tǒng)放射損傷提供理論和實(shí)驗(yàn)依據(jù)。【方法】用8周齡SD大鼠接受22GyX線照射制作樞神經(jīng)系統(tǒng)放射損傷模型;從GFP鼠抽取骨髓,分離和擴(kuò)增MSCs。中樞神經(jīng)系統(tǒng)受放射損傷的SD大鼠4個(gè)月后予靜脈輸注GFP-MSCs。于移植后幾個(gè)時(shí)間點(diǎn)取腦、骨髓、肝、脾等做冰凍切片,用雙光子共聚焦紅外脈沖激光顯微鏡檢測GFP-MSCs。【結(jié)果】在最早24h內(nèi)實(shí)驗(yàn)組和對照組的骨髓中檢測到外源性GFP陽性細(xì)胞,至第7天后實(shí)驗(yàn)組骨髓中GFP
2、陽性細(xì)胞顯著多于對照組。腦內(nèi)第1天未檢測到外源性GFP陽性細(xì)胞,第4天后中樞神經(jīng)系統(tǒng)受放射損傷的SD大鼠,腦組織檢測到帶綠色熒光的外源性GFP陽性細(xì)胞;而對照組腦內(nèi)一直未檢測到帶綠色熒光的外源性MSCs。實(shí)驗(yàn)組和對照組脾臟在輸注MSCs后第1天即檢測到大量GFP陽性細(xì)胞,并持續(xù)存在,第21天實(shí)驗(yàn)組GFP陽性細(xì)胞較對照組減少?!窘Y(jié)論】在放射損傷條件下外源性MSCs可透過血腦屏障到達(dá)腦組織,中樞神經(jīng)系統(tǒng)放射損傷可誘導(dǎo)外源性MSCs向腦組織遷徙定植。【關(guān)鍵詞】?放射損傷中樞神經(jīng)系統(tǒng)骨髓間充質(zhì)干細(xì)胞 ?。粒猓螅簦颍幔悖簦骸荆希猓辏澹悖簦椋觯濉浚裕铮铮猓螅澹颍觯澹簦瑁澹悖瑁幔颍幔悖簦澹颍铮妫簦瑁?/p>
3、mesenchymalstemcells(MSCs)migratingandhomingintheratsafterirradiation,toseekthecueandevidenceofthetreatmentforirradiatingdamageincentralnervoussystem(CNS)withMSCs.【Methods】Brainsof8-weekoldSprague-Dawleyratswereirradiatedwith22GysingledoseofX-ray.Mesenchymalstemcellsextractedfromgreenflorescentp
4、rotein(GFP)expressingratswereextracted,expanded,andtransplantedivtoSDratsaround4monthsafterirradiationofbrain.Atcertaintimepointsaftertransplantationthebrain,bonemarrowandothertissueswereremovedandfrozen.Cryostatsectionswerepreparedandexaminedbytwophotonconfocalmicroscopy.【Results】GFPcellswereob
5、servedinbonemarrowofirradiatedanimalsandunirradiatedanimals24haftertransplantation.NoGFPcellswereobservedinirradiatedandunirradiatedbrainsatearlytimepointof24haftertransplantation.ItappearedpositiveforGFPcellsinCNSofirradiatedSDratsatday4aftertransplantation.Inspleens,alotofGFPcellswereobservedi
6、nirradiatedandunirradiatedanimalsofalltimeandatthe21stday,theamountofGFPcellswerereducedcomparedwithcontrol.【Conclusions】Irradiationmayenhancepassingthroughblood-brainbarrierofMSCsandinducethehomingandmigrationoftheMSCsintheirradiatedrats. ?。耍澹鳎铮颍洌螅海椋颍颍幔洌椋幔簦椋铮?;centralnervoussystem;mesenchymalst
7、emcells 隨著干細(xì)胞工程研究的深入,細(xì)胞替代治療已成為治療損傷、遺傳缺陷性或退行性疾病的新途徑。骨髓間充質(zhì)干細(xì)胞(mesenchymalstemcells,MSCs)是目前備受關(guān)注的一類來源于骨髓單個(gè)核細(xì)胞群,具有多向分化潛能的組織干細(xì)胞。MSCs特性穩(wěn)定,連續(xù)傳代培養(yǎng)和冷凍保存后仍具有多向分化潛能。在體外特定的誘導(dǎo)條件下,MSCs可以分化為骨、軟骨、脂肪、肌腱、韌帶等多種細(xì)胞[1-4]。作為神經(jīng)系統(tǒng)疾病細(xì)胞治療的供體細(xì)胞應(yīng)容易獲得,能