Stroke is a leading cause of death and disability and new therapies are desperately needed. Given the complex nature of ischemic brain injury, it has been postulated that cell-based therapies may be useful. However, c...Stroke is a leading cause of death and disability and new therapies are desperately needed. Given the complex nature of ischemic brain injury, it has been postulated that cell-based therapies may be useful. However, cell resources, invasive extraction procedures, immunological rejection, tumorigenesis and ethical challenges make it unlikely that many stem cell types could serve as a practical source for therapy. By contrast, these issues do not pertain to human amnion epithelial cells（h AECs）, which are placenta-derived stem cells. We recently assessed the effects of systemically delivered hAECs on stroke outcome using four animal models of stroke. We demonstrated that when injected intravenously after ischemia onset, hAECs migrate preferentially to the spleen and injured brain to limit apoptosis and inflammation, and attenuate early brain infiltration of immune cells, progression of infarction and systemic immunosuppression and to ultimately ameliorate functional deficits. When administration of hAECs is delayed by 1-3 days poststroke, long-term functional recovery can still be enhanced in young and aged mice of either sex. Moreover, our proof-of-principle findings suggest that h AECs are effective at limiting post-stroke infarct development in non-human primates. Overall, the results suggest that hAECs could be a viable clinical stroke therapy.展开更多
将小鼠随机分为治疗组和对照组,按20μL/g的剂量腹腔注射10%CCl4溶液,每周2次,连续注射4周,建立小鼠急性肝损伤模型。建模后24h,治疗组尾静脉移植经Dir标记的人羊膜间充质干细胞0.2mL;对照组移植等量未经Dir标记的人羊膜间充质干细胞。...将小鼠随机分为治疗组和对照组,按20μL/g的剂量腹腔注射10%CCl4溶液,每周2次,连续注射4周,建立小鼠急性肝损伤模型。建模后24h,治疗组尾静脉移植经Dir标记的人羊膜间充质干细胞0.2mL;对照组移植等量未经Dir标记的人羊膜间充质干细胞。使用小动物活体成像系统观察人羊膜间充质干细胞在小鼠体内分布。将NOD/SCID小鼠随机分为3组,试验组注射0.2 mL人羊膜间充质干细胞细胞悬液,阳性对照组注射0.2 mL Hep G2细胞悬液,阴性对照组只注射等量Matrigel和PBS的1∶1混合液。60d后脱颈处死小鼠,观察肿瘤形成情况并进行病理组织学检查。结果显示,活体成像试验发现,人羊膜间充质干细胞移植后2h,全身只有肝脏区域有荧光,人羊膜间充质干细胞移植后1d,肝脏及肺脏附近荧光信号达到最强,移植3d,肺部强荧光消失,肝部附近强荧光仍存在,移植后7~30d,全身各处荧光信号消失,但肝部荧光信号持续存在。体内致瘤试验发现,阳性对照组小鼠有肿瘤形成,而注射人羊膜间充质干细胞的试验组小鼠和阴性对照组小鼠均未观察到肿瘤形成。结果表明,人羊膜间充质干细胞尾静脉移植入急性肝损伤小鼠,可以成功归巢至肝脏并长期定植存在;人羊膜间充质干细胞在体内没有致瘤性,具有一定的临床安全性。展开更多
文摘Stroke is a leading cause of death and disability and new therapies are desperately needed. Given the complex nature of ischemic brain injury, it has been postulated that cell-based therapies may be useful. However, cell resources, invasive extraction procedures, immunological rejection, tumorigenesis and ethical challenges make it unlikely that many stem cell types could serve as a practical source for therapy. By contrast, these issues do not pertain to human amnion epithelial cells（h AECs）, which are placenta-derived stem cells. We recently assessed the effects of systemically delivered hAECs on stroke outcome using four animal models of stroke. We demonstrated that when injected intravenously after ischemia onset, hAECs migrate preferentially to the spleen and injured brain to limit apoptosis and inflammation, and attenuate early brain infiltration of immune cells, progression of infarction and systemic immunosuppression and to ultimately ameliorate functional deficits. When administration of hAECs is delayed by 1-3 days poststroke, long-term functional recovery can still be enhanced in young and aged mice of either sex. Moreover, our proof-of-principle findings suggest that h AECs are effective at limiting post-stroke infarct development in non-human primates. Overall, the results suggest that hAECs could be a viable clinical stroke therapy.
文摘将小鼠随机分为治疗组和对照组,按20μL/g的剂量腹腔注射10%CCl4溶液,每周2次,连续注射4周,建立小鼠急性肝损伤模型。建模后24h,治疗组尾静脉移植经Dir标记的人羊膜间充质干细胞0.2mL;对照组移植等量未经Dir标记的人羊膜间充质干细胞。使用小动物活体成像系统观察人羊膜间充质干细胞在小鼠体内分布。将NOD/SCID小鼠随机分为3组,试验组注射0.2 mL人羊膜间充质干细胞细胞悬液,阳性对照组注射0.2 mL Hep G2细胞悬液,阴性对照组只注射等量Matrigel和PBS的1∶1混合液。60d后脱颈处死小鼠,观察肿瘤形成情况并进行病理组织学检查。结果显示,活体成像试验发现,人羊膜间充质干细胞移植后2h,全身只有肝脏区域有荧光,人羊膜间充质干细胞移植后1d,肝脏及肺脏附近荧光信号达到最强,移植3d,肺部强荧光消失,肝部附近强荧光仍存在,移植后7~30d,全身各处荧光信号消失,但肝部荧光信号持续存在。体内致瘤试验发现,阳性对照组小鼠有肿瘤形成,而注射人羊膜间充质干细胞的试验组小鼠和阴性对照组小鼠均未观察到肿瘤形成。结果表明,人羊膜间充质干细胞尾静脉移植入急性肝损伤小鼠,可以成功归巢至肝脏并长期定植存在;人羊膜间充质干细胞在体内没有致瘤性,具有一定的临床安全性。
