AIM:To reconstruct the lamellar cornea using human amniotic epithelial(HAE) cells and rabbit cornea stroma in vitro using tissue engineering technology.·METHODS:Human amnia taken from uncomplicated caesarean sect...AIM:To reconstruct the lamellar cornea using human amniotic epithelial(HAE) cells and rabbit cornea stroma in vitro using tissue engineering technology.·METHODS:Human amnia taken from uncomplicated caesarean sections were digested by collagenase to obtain HAE cells,and the cells were cultured to proliferate.Rabbit corneal epithelial cells were removed by n-heptanol to make lamellar matrix sheets.The second passage of HAE cells were cultured on the corneal stroma sheets for 1 or 2 days,then transferred to an air-liquid interface environment to culture for 2weeks.Tissue engineered lamellar cornea(TELC)morphology was observed by Hematoxylin-eosin(HE)staining;its ultrastructure was observed by transmission electron microscopy(TEM) and scanning electron microscopy(SEM);corneal epithelial cell-specific keratin3 and keratin 12 were detected with immunofluorescence microscopy.·RESULTS:HAE cells grew on the rabbit corneal stroma,forming a monolayer after 1-2 days.About 4-5 layers of epithelial cells developed after 2 weeks of air-liquid interface cultivation,a result similar to normal corneal epithelium.Rabbit corneal stromal cells were significantly reduced after one week,then almost completely disappeared after 2 weeks.TEM showed desmosomes between the epithelial cells;hemidesmosomes formed between the epithelial cells and the basement membrane.SEM revealed that the HAE cells which grew on the lamellar cornea had abundant microvilli.The tissue-engineered cornea expressed keratin 3 and keratin 12,as detected by immunofluorescence assay.·CONCLUSION:Functional tissue-engineered lamellar corneal grafts can be constructed in vitro using HAE cells and rabbit corneal stroma.展开更多
Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial...Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial scaffold materials, such as fibroin, for nerve repair. However, such approaches are challenged by ethical and practical issues. Amniotic tissue, a clinical waste product, is abundant, and amniotic epithe- lial cells are pluripotent, have low immunogenicity, and are not the subject of ethical debate. We hypothesized that amniotic epithelial cells combined with silk fibroin scaffolds would be conducive to the repair of spinal cord injury. To test this, we isolated and cultured amniotic epithelial cells, and constructed complexes of these cells and silk fibroin scaffolds. Implantation of the cell-scaffold complex into a rat model of spinal cord injury resulted in a smaller glial scar in the damaged cord tissue than in model rats that received a blank scaffold, or amniotic epithelial cells alone. In addition to a milder local immunological reaction, the rats showed less inflammatory cell infiltration at the trans- plant site, milder host-versus-graft reaction, and a marked improvement in motor function. These findings confirm that the transplantation of amniotic epithelial ceils combined with silk fibroin scaffold can promote the repair of spinal cord injury. Silk fibroin scaffold can provide a good nerve regeneration microenvironment for amniotic epithelial cells.展开更多
BACKGROUND To solve the problem of liver transplantation donor insufficiency,an alternative cell transplantation therapy was investigated.We focused on amniotic epithelial cells(AECs)as a cell source because,unlike in...BACKGROUND To solve the problem of liver transplantation donor insufficiency,an alternative cell transplantation therapy was investigated.We focused on amniotic epithelial cells(AECs)as a cell source because,unlike induced pluripotent stem cells,they are cost-effective and non-tumorigenic.The utilization of AECs in regenerative medicine,however,is in its infancy.A general profile for AECs has not been comprehensively analyzed.Moreover,no hepatic differentiation protocol for AECs has yet been established.To this end,we independently compiled human AEC libraries,purified amniotic stem cells(ASCs),and co-cultured them with mesenchymal stem cells(MSCs)and human umbilical vein endothelial cell(HUVECs)in a 3D system which induces functional hepatic organoids.AIM To characterize AECs and generate functional hepatic organoids from ASCs and other somatic stem cells METHODS AECs,MSCs,and HUVECs were isolated from the placentae and umbilical cords of cesarean section patients.Amnion and primary AEC stemness characteristics and heterogeneity were analyzed by immunocytochemistry,Alkaline phosphatase(AP)staining,and flow cytometry.An adherent AEC subpopulation was selected and evaluated for ASC purification quality by a colony formation assay.AEC transcriptomes were compared with those for other hepatocytes cell sources by bioinformatics.The 2D and 3D culture were compared by relative gene expression using several differentiation protocols.ASCs,MSCs,and HUVECs were combined in a 3D co-culture system to generate hepatic organoids whose structure was compared with a 3D AEC sphere and whose function was elucidated by immunofluorescence imaging,periodic acid Schiff,and an indocyanine green(ICG)test.RESULTS AECs have certain stemness markers such as EPCAM,SSEA4,and E-cadherin.One AEC subpopulation was also either positive for AP staining or expressed the TRA-1-60 and TRA-1-81 stemness markers.Moreover,it could form colonies and its frequency was enhanced ten-fold in the adherent subpopulation after selective primary passage.Bioinfo展开更多
The present study co-cultured human embryonic olfactory ensheathJng cells, human Schwann cells, human amniotic epithelial cells and human vascular endothelial cells in complete culture medium- containing cerebrospinal...The present study co-cultured human embryonic olfactory ensheathJng cells, human Schwann cells, human amniotic epithelial cells and human vascular endothelial cells in complete culture medium- containing cerebrospinal fluid. Enzyme linked immunosorbent assay was used to detect nerve growth factor, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor secretion in the supernatant of co-cultured cells. Results showed that the number of all cell types reached a peak at 7-10 days, and the expression of nerve growth factor, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor peaked at 9 days. Levels of secreted nerve growth factor were four-fold higher than brain-derived neurotrophic factor, which was three-fold higher than glial cell line-derived neurotrophic factor. Increasing concentrations of cerebrospinal fluid （10%, 20% and 30%） in the growth medium caused a decrease of neurotrophic factor secretion Results indicated co-culture of human embryonic olfactory ensheathing cells, human Schwann cells human amniotic epithelial cells and human vascular endothelial cells improved the expression of nerve growth factor, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor. The reduction of cerebrospinal fluid extravasation at the transplant site after spinal cord injury is beneficial for the survival and secretion of neurotrophic factors from transplanted cells.展开更多
目的:探讨Smad3在未足月胎膜早破(PPROM)胎膜中的表达情况,Smad3对羊膜上皮细胞的生物学行为的影响,及其在未足月胎膜早破发病机制中的作用。方法:收集12例PPROM孕妇(PPROM组)和15例正常足月孕妇(对照组)的胎膜组织,利用蛋白质印迹法比...目的:探讨Smad3在未足月胎膜早破(PPROM)胎膜中的表达情况,Smad3对羊膜上皮细胞的生物学行为的影响,及其在未足月胎膜早破发病机制中的作用。方法:收集12例PPROM孕妇(PPROM组)和15例正常足月孕妇(对照组)的胎膜组织,利用蛋白质印迹法比较胎膜组织中的Smad3和磷酸化Smad3(p-Smad3)蛋白表达水平;免疫组织化学方法检测p-Smad3在胎膜组织中的表达及定位;免疫荧光法检测p-Smad3在人羊膜上皮细胞系(WISH)中的表达及定位WISH细胞分为3组:空白对照组(不经任何处理)、阴性对照组及SIS3抑制剂组;Smad3磷酸化特异性抑制剂SIS3处理WISH细胞后,利用Edu方法和流式细胞技术分别检测其对细胞增殖和凋亡的影响;蛋白质印迹法检测凋亡相关蛋白表达的变化。结果:①p-Smad3/Smad3在PPROM组的蛋白相对表达量(1.248±0.140)明显低于对照组(1.579±0.199),差异有统计学意义(P<0.05)。②胎膜组织中p-Smad3主要表达于羊膜上皮细胞和绒毛膜滋养细胞,且在WISH细胞中p-Smad3主要表达于细胞核;③SIS3抑制剂组WISH细胞的增殖能力[(39.094±5.142)%]明显低于对照组[(58.249±6.444)%],差异有统计学意义(P<0.05);④SIS3抑制剂组细胞凋亡水平[(9.623±1.645)%]相较于对照组[(5.080±0.276)%]显著增加,差异有统计学意义(P<0.05);⑤与阴性对照组比较,p-Smad3水平的降低分别导致cleaved caspase-3蛋白(0.629±0.038 vs 1.084±0.057)和BAX蛋白(0.856±0.052 vs 1.387±0.079)上调,以及BCL-2蛋白下调(0.997±0.048 vs 0.736±0.069),差异有统计学意义(P<0.05)。结论:p-Smad3蛋白水平的降低可能通过抑制羊膜上皮细胞的增殖、促进其凋亡而参与未足月胎膜早破的发生,其机制可能与上调BAX、下调BCL-2的表达相关。展开更多
This study was designed to verify the stem cell properties of sheep amniotic epithelial cells and their capacity for neural differentiation. Immunofluorescence microscopy and reverse transcription-PCR revealed that th...This study was designed to verify the stem cell properties of sheep amniotic epithelial cells and their capacity for neural differentiation. Immunofluorescence microscopy and reverse transcription-PCR revealed that the sheep amniotic epithelial cells were positive for the embryonic stem cell marker proteins SSEA-1, SSEA-3, SSEA-4, TRA-1-60 and TRA-1-81, and the totipotency-associated genes Oct-4, Sox-2 and Rex-1, but negative for Nanog. Amniotic epithelial cells expressed β-Ⅲ-tubulin, glial fibrillary acidic protein, nestin and microtubule-associated protein-2 at 28 days after induction with serum-free neurobasal-A medium containing B-27. Thus, sheep amniotic epithelial cells could differentiate into neurons expressing β-Ⅲ-tubulin and microtubule-associated protein-2, and glial-like cells expressing glial fibrillary acidic protein, under specific conditions.展开更多
基金National Natural Science Foundation of China (No.30872808No.81100637)
文摘AIM:To reconstruct the lamellar cornea using human amniotic epithelial(HAE) cells and rabbit cornea stroma in vitro using tissue engineering technology.·METHODS:Human amnia taken from uncomplicated caesarean sections were digested by collagenase to obtain HAE cells,and the cells were cultured to proliferate.Rabbit corneal epithelial cells were removed by n-heptanol to make lamellar matrix sheets.The second passage of HAE cells were cultured on the corneal stroma sheets for 1 or 2 days,then transferred to an air-liquid interface environment to culture for 2weeks.Tissue engineered lamellar cornea(TELC)morphology was observed by Hematoxylin-eosin(HE)staining;its ultrastructure was observed by transmission electron microscopy(TEM) and scanning electron microscopy(SEM);corneal epithelial cell-specific keratin3 and keratin 12 were detected with immunofluorescence microscopy.·RESULTS:HAE cells grew on the rabbit corneal stroma,forming a monolayer after 1-2 days.About 4-5 layers of epithelial cells developed after 2 weeks of air-liquid interface cultivation,a result similar to normal corneal epithelium.Rabbit corneal stromal cells were significantly reduced after one week,then almost completely disappeared after 2 weeks.TEM showed desmosomes between the epithelial cells;hemidesmosomes formed between the epithelial cells and the basement membrane.SEM revealed that the HAE cells which grew on the lamellar cornea had abundant microvilli.The tissue-engineered cornea expressed keratin 3 and keratin 12,as detected by immunofluorescence assay.·CONCLUSION:Functional tissue-engineered lamellar corneal grafts can be constructed in vitro using HAE cells and rabbit corneal stroma.
基金supported by the Scientific Research Project Fund of Wuxi Municipal Health and Family Planning Commission,No.MS201402
文摘Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial scaffold materials, such as fibroin, for nerve repair. However, such approaches are challenged by ethical and practical issues. Amniotic tissue, a clinical waste product, is abundant, and amniotic epithe- lial cells are pluripotent, have low immunogenicity, and are not the subject of ethical debate. We hypothesized that amniotic epithelial cells combined with silk fibroin scaffolds would be conducive to the repair of spinal cord injury. To test this, we isolated and cultured amniotic epithelial cells, and constructed complexes of these cells and silk fibroin scaffolds. Implantation of the cell-scaffold complex into a rat model of spinal cord injury resulted in a smaller glial scar in the damaged cord tissue than in model rats that received a blank scaffold, or amniotic epithelial cells alone. In addition to a milder local immunological reaction, the rats showed less inflammatory cell infiltration at the trans- plant site, milder host-versus-graft reaction, and a marked improvement in motor function. These findings confirm that the transplantation of amniotic epithelial ceils combined with silk fibroin scaffold can promote the repair of spinal cord injury. Silk fibroin scaffold can provide a good nerve regeneration microenvironment for amniotic epithelial cells.
基金Supported by National Natural Science Foundation of China,No.81770621Ministry of Education,Culture,Sports,Science,and Technology of Japan,KAKENHI,No.16K15604,No.18H02866Japan Science and Technology Agency-Japan International Cooperation Agency’s(JST-JICA)Science and Technology Research Partnership for Sustainable Development(SATREPS)Project
文摘BACKGROUND To solve the problem of liver transplantation donor insufficiency,an alternative cell transplantation therapy was investigated.We focused on amniotic epithelial cells(AECs)as a cell source because,unlike induced pluripotent stem cells,they are cost-effective and non-tumorigenic.The utilization of AECs in regenerative medicine,however,is in its infancy.A general profile for AECs has not been comprehensively analyzed.Moreover,no hepatic differentiation protocol for AECs has yet been established.To this end,we independently compiled human AEC libraries,purified amniotic stem cells(ASCs),and co-cultured them with mesenchymal stem cells(MSCs)and human umbilical vein endothelial cell(HUVECs)in a 3D system which induces functional hepatic organoids.AIM To characterize AECs and generate functional hepatic organoids from ASCs and other somatic stem cells METHODS AECs,MSCs,and HUVECs were isolated from the placentae and umbilical cords of cesarean section patients.Amnion and primary AEC stemness characteristics and heterogeneity were analyzed by immunocytochemistry,Alkaline phosphatase(AP)staining,and flow cytometry.An adherent AEC subpopulation was selected and evaluated for ASC purification quality by a colony formation assay.AEC transcriptomes were compared with those for other hepatocytes cell sources by bioinformatics.The 2D and 3D culture were compared by relative gene expression using several differentiation protocols.ASCs,MSCs,and HUVECs were combined in a 3D co-culture system to generate hepatic organoids whose structure was compared with a 3D AEC sphere and whose function was elucidated by immunofluorescence imaging,periodic acid Schiff,and an indocyanine green(ICG)test.RESULTS AECs have certain stemness markers such as EPCAM,SSEA4,and E-cadherin.One AEC subpopulation was also either positive for AP staining or expressed the TRA-1-60 and TRA-1-81 stemness markers.Moreover,it could form colonies and its frequency was enhanced ten-fold in the adherent subpopulation after selective primary passage.Bioinfo
基金supported by the Science andTechnology Development Program of Guangdong Province, No.2009b030801329
文摘The present study co-cultured human embryonic olfactory ensheathJng cells, human Schwann cells, human amniotic epithelial cells and human vascular endothelial cells in complete culture medium- containing cerebrospinal fluid. Enzyme linked immunosorbent assay was used to detect nerve growth factor, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor secretion in the supernatant of co-cultured cells. Results showed that the number of all cell types reached a peak at 7-10 days, and the expression of nerve growth factor, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor peaked at 9 days. Levels of secreted nerve growth factor were four-fold higher than brain-derived neurotrophic factor, which was three-fold higher than glial cell line-derived neurotrophic factor. Increasing concentrations of cerebrospinal fluid （10%, 20% and 30%） in the growth medium caused a decrease of neurotrophic factor secretion Results indicated co-culture of human embryonic olfactory ensheathing cells, human Schwann cells human amniotic epithelial cells and human vascular endothelial cells improved the expression of nerve growth factor, brain-derived neurotrophic factor, and glial cell line-derived neurotrophic factor. The reduction of cerebrospinal fluid extravasation at the transplant site after spinal cord injury is beneficial for the survival and secretion of neurotrophic factors from transplanted cells.
文摘目的:探讨Smad3在未足月胎膜早破(PPROM)胎膜中的表达情况,Smad3对羊膜上皮细胞的生物学行为的影响,及其在未足月胎膜早破发病机制中的作用。方法:收集12例PPROM孕妇(PPROM组)和15例正常足月孕妇(对照组)的胎膜组织,利用蛋白质印迹法比较胎膜组织中的Smad3和磷酸化Smad3(p-Smad3)蛋白表达水平;免疫组织化学方法检测p-Smad3在胎膜组织中的表达及定位;免疫荧光法检测p-Smad3在人羊膜上皮细胞系(WISH)中的表达及定位WISH细胞分为3组:空白对照组(不经任何处理)、阴性对照组及SIS3抑制剂组;Smad3磷酸化特异性抑制剂SIS3处理WISH细胞后,利用Edu方法和流式细胞技术分别检测其对细胞增殖和凋亡的影响;蛋白质印迹法检测凋亡相关蛋白表达的变化。结果:①p-Smad3/Smad3在PPROM组的蛋白相对表达量(1.248±0.140)明显低于对照组(1.579±0.199),差异有统计学意义(P<0.05)。②胎膜组织中p-Smad3主要表达于羊膜上皮细胞和绒毛膜滋养细胞,且在WISH细胞中p-Smad3主要表达于细胞核;③SIS3抑制剂组WISH细胞的增殖能力[(39.094±5.142)%]明显低于对照组[(58.249±6.444)%],差异有统计学意义(P<0.05);④SIS3抑制剂组细胞凋亡水平[(9.623±1.645)%]相较于对照组[(5.080±0.276)%]显著增加,差异有统计学意义(P<0.05);⑤与阴性对照组比较,p-Smad3水平的降低分别导致cleaved caspase-3蛋白(0.629±0.038 vs 1.084±0.057)和BAX蛋白(0.856±0.052 vs 1.387±0.079)上调,以及BCL-2蛋白下调(0.997±0.048 vs 0.736±0.069),差异有统计学意义(P<0.05)。结论:p-Smad3蛋白水平的降低可能通过抑制羊膜上皮细胞的增殖、促进其凋亡而参与未足月胎膜早破的发生,其机制可能与上调BAX、下调BCL-2的表达相关。
基金funded by the National High-Tech Research and Development Program of China(863Program),No.2008AA101005
文摘This study was designed to verify the stem cell properties of sheep amniotic epithelial cells and their capacity for neural differentiation. Immunofluorescence microscopy and reverse transcription-PCR revealed that the sheep amniotic epithelial cells were positive for the embryonic stem cell marker proteins SSEA-1, SSEA-3, SSEA-4, TRA-1-60 and TRA-1-81, and the totipotency-associated genes Oct-4, Sox-2 and Rex-1, but negative for Nanog. Amniotic epithelial cells expressed β-Ⅲ-tubulin, glial fibrillary acidic protein, nestin and microtubule-associated protein-2 at 28 days after induction with serum-free neurobasal-A medium containing B-27. Thus, sheep amniotic epithelial cells could differentiate into neurons expressing β-Ⅲ-tubulin and microtubule-associated protein-2, and glial-like cells expressing glial fibrillary acidic protein, under specific conditions.
