中文摘要
经血干细胞是新发现的成体干细胞,具有来源广、无创和极易扩增等多项优点。它在再生医学领域的应用前景看好。前期研究将7例中重度宫腔粘连患者体外扩增的自体经血干细胞(MenSCs)移植回宫腔内,发现子宫内膜显著增厚,达到较好的修复效果,且部分患者成功妊娠。同时,在体外培养的经血干细胞中加入富血小板血浆(PRP),可以显著促进干细胞的增殖,提示其能辅助经血干细胞的作用。因此,又对4例患者进行了自体经血干细胞联合PRP移植,发现1例患者移植3周后内膜显著增厚至8mm。通过前期结果推测,自体经血干细胞联合PRP移植,可以实现子宫内膜的形态和功能再生。本项目拟先建立宫腔粘连动物模型,研究经血干细胞促进子宫内膜再生的具体分子机制。同时进一步扩大样本量确实联合疗法治疗难治性子宫内膜损伤的临床效果。研究结果将有助于深入理解子宫内膜损伤修复的分子机理,为经血干细胞的临床应用奠定基础,从而在治疗上取得突破性进展。
英文摘要
Menstrual blood-derived stromal stem cells (MenSCs), characterized by ease of abstraction, noninvasive and highly proliferative, is a newly identified type of adult stem cells. MenSCs is a promising candidate for stem cell therapy. Previously, autologous menSCs was cultured from menstrual blood of 7 patients with severe intrauterine adhesions (IUA), and transferred back to their worms. The endometrium thickness (ET) of these women was significantly increased, and 3 of them had conceived successfully. Besides, platelet-rich plasma (PRP) promoted MenSCs proliferation in vitro, which implies the auxillary effect of PRP. Thus, 4 severe IUA patients accepted autologous MenSCs combined with PRP transplantation, 1 ET significantly increased to 8 mm within 3 weeks. These results indicate that autologous MenSCs combined with PRP transplantation will be an effective remedy for refractory endometrial damage. In this project, we will investigate the molecular mechanism of MenSCs for endometrial regeneration, by using an established mouse model for IUA. Meanwhile, more patients will be recruited to prove the efficacy of this therapy. Our work will help understanding the process of endometrial regeneration, warrant clinical application of such combined remedy and most importantly supply a cure for those infertile patients.
结题摘要
在前期临床研究中,我们发现经血干细胞移植显著促进中重度宫腔粘连患者子宫内膜增厚,并且部分患者在接受冻融胚胎移植后成功妊娠。但是,仍有部分患者子宫内膜不能达到足以支持妊娠的厚度。因此,拟用富血小板血浆联合经血干细胞移植促进细胞疗效。本项目通过建立宫腔粘连动物模型,证实了经血干细胞和联合富血小板血浆促进子宫内膜损伤修复的效果。子宫浆膜下注射的经血干细胞能稳定定植于子宫和卵巢组织中,并主要位于上皮和血管周围。移植经血干细胞后内膜中的胶原沉积显著减少,血管密度显著增加,细胞增殖也显著增多。CK-18阳性的上皮细胞和Vimentin阳性的基质细胞分化显著增多,提示内膜再生。此外通过分析炎性细胞因子的表达谱提示,经血干细胞移植显著降低炎性因子促Il-6的水平,同时显著升高抑炎性因子Il-4和Il-10的表达,缓解了组织炎症反应。通过real-time PCR分析发现,经血干细胞移植后的大鼠内膜组织存在IGF-1,SDF-1和TSP-1等人源性细胞因子表达,且在PRP联合移植后显著增加,提示经血干细胞通过旁分泌效应发挥作用。RNA测序分析结果提示,经血干细胞可能调控Hippo通路实现子宫内膜再生。Western Blot和real-time PCR证实经血干细胞移植组Hippo通路相关分子Ctgf,Wnt5a和Gdf-5差异表达显著。大鼠交配后妊娠结果表明经血干细胞移植显著提高胚胎种植率和存活率。综上所述,我们证实了富血小板血浆显著促进经血干细胞修复损伤子宫内膜的作用,并且初步探讨了经血干细胞发挥效应的分子机制。
