Human placenta-derived mononuclear cells （MNC） were isolated by a Percoll density gradient and cultured in mesenchymal stem cell （MSC） maintenance medium. The homogenous layer of adherent cells exhibited a typical...Human placenta-derived mononuclear cells （MNC） were isolated by a Percoll density gradient and cultured in mesenchymal stem cell （MSC） maintenance medium. The homogenous layer of adherent cells exhibited a typical fibroblastlike morphology, a large expansive potential, and cell cycle characteristics including a subset of quiescent cells. In vitro differentiation assays showed the tripotential differentiation capacity of these cells toward adipogenic, osteogenic and chondrogenic lineages. Flow cytometry analyses and immunocytochemistry stain showed that placental MSC was a homogeneous cell population devoid of hematopoietic cells, which uniformly expressed CD29, CD44, CD73, CD105, CD166, laminin, fibronectin and vimentin while being negative for expression of CD31, CD34, CD45 and m-smooth muscle actin. Most importantly, immuno-phenotypic analyses demonstrated that these cells expressed class Ⅰ major histocompatibility complex （MHC-I）, but they did not express MHC-Ⅱ molecules. Additionally these cells could suppress umbilical cord blood （UCB） lymphocytes proliferation induced by cellular or nonspecific mitogenic stimuli. This strongly implies that they may have potential application in allograft transplantation. Since placenta and UCB are homogeneous, the MSC derived from human placenta can be transplanted combined with hematopoietic stem cells （HSC） from UCB to reduce the potential graft-versus-host disease （GVHD） in recipients.展开更多
We induced human placenta-derived mesenchymal stem cells （hPMSCs） to differentiate into neural cells by adding chemical reagents, despite the fact that toxic chemicals induce cell shrinkage or cytoskeletal formation...We induced human placenta-derived mesenchymal stem cells （hPMSCs） to differentiate into neural cells by adding chemical reagents, despite the fact that toxic chemicals induce cell shrinkage or cytoskeletal formation, which does not represent a proper cell differentiation process. The present study established a co-culture system with hPMSCs and neural cells and analyzed the influence of neural cells on hPMSC differentiation in a co-culture system, hPMSCs were isolated and purified from human full-term placenta using collagenase digestion. Fetal neural cells were co-cultured with hPMSCs for 48 hours using the Transwell co-culture system, hPMSCs co-cultured with neural cells exhibited a slender morphology with a filament. After 96 hours, hPMSCs expressed neuron-specific enolase, which suggested that co-culture of hPMSCs and neural cells induced neural differentiation of hPMSCs.展开更多
Uric acid is an important, naturally occurring serum antioxidant. The present study investigates the use of uric acid for promoting proliferation and neuronal differentiation of mesenchymal stem cells derived from hum...Uric acid is an important, naturally occurring serum antioxidant. The present study investigates the use of uric acid for promoting proliferation and neuronal differentiation of mesenchymal stem cells derived from human placenta tissue. Human placenta-derived mesenchymal stem cells were pre-induced in the presence of either 0, 0.2, 0.4 or 0.8 mM uric acid in combination with 1 mM β-mercaptoethanol for 24 hours, followed by exposure to identical uric acid concentrations and 5 mM β-mercaptoethanol for 6 and 10 hours. Cells developed a neuronal-like morphology, with formation of interconnected process extensions, typical of neural cells. Immunocytochemistry and immunofluorescence staining showed neuron specific enolase positive cells were present in each group except the control group. A greater number of neuron specific enolase positive cells were observed in 0.8 mM uric acid in combination with 5 mM β-mercaptoethanol at 10 hours. After 24 hours of induction, Nissl bodies were detected in the cytoplasm of all differentiated cell groups except the control group and Nissl body numbers were greatest in human placenta-derived mesenchymal stem cells grown in the presence of 0.8 mM uric acid and 5 mM β-mercaptoethanol. These results suggest uric acid accelerates differentiation of human placenta-derived mesenchymal stem cells into neuronal-like cells in a time-and concentration-dependent manner.展开更多
Atrophic scars, a permanent complication of severe acne, have negative effect on psychology in adolescent. The treatment of atrophic scar is depended on types of scar and it is difficult to improve by a single treatme...Atrophic scars, a permanent complication of severe acne, have negative effect on psychology in adolescent. The treatment of atrophic scar is depended on types of scar and it is difficult to improve by a single treatment. Mesenchymal stem cell is a scientific approval for surgery scar treatment and wound healing. We present a case report of female presented with atrophic acne scar distributed on both cheeks. The case aims to prove that the combination of MSCs and aqueous human placenta extract (RGF®) contained bioactive therapeutic molecules obviously promoted the improvement of skin scar to reach the optimal outcomes. We first found that MSCs-contained human placenta extract solution combination subcision improves the atrophic acne scar and skin complexity by enhancement of skin cell regeneration.展开更多
The developmental origins of health and diseases(DOHaD)is a concept stating that adverse intrauterine environments contribute to the health risks of offspring.Since the theory emerged more than 30 years ago,many epide...The developmental origins of health and diseases(DOHaD)is a concept stating that adverse intrauterine environments contribute to the health risks of offspring.Since the theory emerged more than 30 years ago,many epidemiological and animal studies have confirmed that in utero exposure to environmental insults,including hyperglycemia and chemicals,increased the risk of developing noncommunicable diseases(NCDs).These NCDs include metabolic syndrome,type 2 diabetes,and complications such as diabetic cardiomyopathy.Studying the effects of different environmental insults on early embryo development would aid in understanding the underlying mechanisms by which these insults promote NCD development.Embryonic stem cells(ESCs)have also been utilized by researchers to study the DOHaD.ESCs have pluripotent characteristics and can be differentiated into almost every cell lineage;therefore,they are excellent in vitro models for studying early developmental events.More importantly,human ESCs(hESCs)are the best alternative to human embryos for research because of ethical concerns.In this review,we will discuss different maternal conditions associated with DOHaD,focusing on the complications of maternal diabetes.Next,we will review the differentiation protocols developed to generate different cell lineages from hESCs.Additionally,we will review how hESCs are utilized as a model for research into the DOHaD.The effects of environmental insults on hESC differentiation and the possible involvement of epigenetic regulation will be discussed.展开更多
目的探索一种新的获取间充质干细胞(m esem chym al stem cells,MSCs)的来源及方法。MSCs在成人骨髓内含量极低,数量随着年龄的增长而减少。MSCs同时少量出现于外周血以及脐带血、胎儿组织器官内,然而,胎儿组织样本难以获取,脐带血中含...目的探索一种新的获取间充质干细胞(m esem chym al stem cells,MSCs)的来源及方法。MSCs在成人骨髓内含量极低,数量随着年龄的增长而减少。MSCs同时少量出现于外周血以及脐带血、胎儿组织器官内,然而,胎儿组织样本难以获取,脐带血中含量太低。这样,如何获得合适的MSCs来源以建立稳定的培养体系,同时避免伦理道德问题的约束是一个值得探索的课题。方法消化胎盘实体组织,贴壁培养细胞,观测形态并检测其细胞表面抗原表达以及分化潜能。结果胎盘组织中分离出的贴壁细胞与骨髓间充质干细胞有相似形态和细胞表面标志,具有分化为成骨细胞以及神经细胞的能力。结论胎盘组织中含有的多分化潜能细胞(p lacenta-derived mu ltipotent cells,PDMCs)与骨髓MSCs形态功能相似,胎盘可以作为获取MSCs的一种有效来源。展开更多
基金This study was supported by a grant from National Natural Science Foundation of China(No.30271245)Hi-Tech Research and Development Program of China(863 Program)(No.2003AA205170)+1 种基金National Basic Research Program of China(973 Program)(No.G 1999054302)a grant from Bejing Gynecology and Obstetrics Hospital Affiliate of Capital University of Medical Sciences.
文摘Human placenta-derived mononuclear cells （MNC） were isolated by a Percoll density gradient and cultured in mesenchymal stem cell （MSC） maintenance medium. The homogenous layer of adherent cells exhibited a typical fibroblastlike morphology, a large expansive potential, and cell cycle characteristics including a subset of quiescent cells. In vitro differentiation assays showed the tripotential differentiation capacity of these cells toward adipogenic, osteogenic and chondrogenic lineages. Flow cytometry analyses and immunocytochemistry stain showed that placental MSC was a homogeneous cell population devoid of hematopoietic cells, which uniformly expressed CD29, CD44, CD73, CD105, CD166, laminin, fibronectin and vimentin while being negative for expression of CD31, CD34, CD45 and m-smooth muscle actin. Most importantly, immuno-phenotypic analyses demonstrated that these cells expressed class Ⅰ major histocompatibility complex （MHC-I）, but they did not express MHC-Ⅱ molecules. Additionally these cells could suppress umbilical cord blood （UCB） lymphocytes proliferation induced by cellular or nonspecific mitogenic stimuli. This strongly implies that they may have potential application in allograft transplantation. Since placenta and UCB are homogeneous, the MSC derived from human placenta can be transplanted combined with hematopoietic stem cells （HSC） from UCB to reduce the potential graft-versus-host disease （GVHD） in recipients.
文摘We induced human placenta-derived mesenchymal stem cells （hPMSCs） to differentiate into neural cells by adding chemical reagents, despite the fact that toxic chemicals induce cell shrinkage or cytoskeletal formation, which does not represent a proper cell differentiation process. The present study established a co-culture system with hPMSCs and neural cells and analyzed the influence of neural cells on hPMSC differentiation in a co-culture system, hPMSCs were isolated and purified from human full-term placenta using collagenase digestion. Fetal neural cells were co-cultured with hPMSCs for 48 hours using the Transwell co-culture system, hPMSCs co-cultured with neural cells exhibited a slender morphology with a filament. After 96 hours, hPMSCs expressed neuron-specific enolase, which suggested that co-culture of hPMSCs and neural cells induced neural differentiation of hPMSCs.
文摘Uric acid is an important, naturally occurring serum antioxidant. The present study investigates the use of uric acid for promoting proliferation and neuronal differentiation of mesenchymal stem cells derived from human placenta tissue. Human placenta-derived mesenchymal stem cells were pre-induced in the presence of either 0, 0.2, 0.4 or 0.8 mM uric acid in combination with 1 mM β-mercaptoethanol for 24 hours, followed by exposure to identical uric acid concentrations and 5 mM β-mercaptoethanol for 6 and 10 hours. Cells developed a neuronal-like morphology, with formation of interconnected process extensions, typical of neural cells. Immunocytochemistry and immunofluorescence staining showed neuron specific enolase positive cells were present in each group except the control group. A greater number of neuron specific enolase positive cells were observed in 0.8 mM uric acid in combination with 5 mM β-mercaptoethanol at 10 hours. After 24 hours of induction, Nissl bodies were detected in the cytoplasm of all differentiated cell groups except the control group and Nissl body numbers were greatest in human placenta-derived mesenchymal stem cells grown in the presence of 0.8 mM uric acid and 5 mM β-mercaptoethanol. These results suggest uric acid accelerates differentiation of human placenta-derived mesenchymal stem cells into neuronal-like cells in a time-and concentration-dependent manner.
文摘Atrophic scars, a permanent complication of severe acne, have negative effect on psychology in adolescent. The treatment of atrophic scar is depended on types of scar and it is difficult to improve by a single treatment. Mesenchymal stem cell is a scientific approval for surgery scar treatment and wound healing. We present a case report of female presented with atrophic acne scar distributed on both cheeks. The case aims to prove that the combination of MSCs and aqueous human placenta extract (RGF®) contained bioactive therapeutic molecules obviously promoted the improvement of skin scar to reach the optimal outcomes. We first found that MSCs-contained human placenta extract solution combination subcision improves the atrophic acne scar and skin complexity by enhancement of skin cell regeneration.
文摘The developmental origins of health and diseases(DOHaD)is a concept stating that adverse intrauterine environments contribute to the health risks of offspring.Since the theory emerged more than 30 years ago,many epidemiological and animal studies have confirmed that in utero exposure to environmental insults,including hyperglycemia and chemicals,increased the risk of developing noncommunicable diseases(NCDs).These NCDs include metabolic syndrome,type 2 diabetes,and complications such as diabetic cardiomyopathy.Studying the effects of different environmental insults on early embryo development would aid in understanding the underlying mechanisms by which these insults promote NCD development.Embryonic stem cells(ESCs)have also been utilized by researchers to study the DOHaD.ESCs have pluripotent characteristics and can be differentiated into almost every cell lineage;therefore,they are excellent in vitro models for studying early developmental events.More importantly,human ESCs(hESCs)are the best alternative to human embryos for research because of ethical concerns.In this review,we will discuss different maternal conditions associated with DOHaD,focusing on the complications of maternal diabetes.Next,we will review the differentiation protocols developed to generate different cell lineages from hESCs.Additionally,we will review how hESCs are utilized as a model for research into the DOHaD.The effects of environmental insults on hESC differentiation and the possible involvement of epigenetic regulation will be discussed.
文摘目的探索一种新的获取间充质干细胞(m esem chym al stem cells,MSCs)的来源及方法。MSCs在成人骨髓内含量极低,数量随着年龄的增长而减少。MSCs同时少量出现于外周血以及脐带血、胎儿组织器官内,然而,胎儿组织样本难以获取,脐带血中含量太低。这样,如何获得合适的MSCs来源以建立稳定的培养体系,同时避免伦理道德问题的约束是一个值得探索的课题。方法消化胎盘实体组织,贴壁培养细胞,观测形态并检测其细胞表面抗原表达以及分化潜能。结果胎盘组织中分离出的贴壁细胞与骨髓间充质干细胞有相似形态和细胞表面标志,具有分化为成骨细胞以及神经细胞的能力。结论胎盘组织中含有的多分化潜能细胞(p lacenta-derived mu ltipotent cells,PDMCs)与骨髓MSCs形态功能相似,胎盘可以作为获取MSCs的一种有效来源。
