Purpose: To establish an animal model of autologous oral mucosa grafting for limbal stem cell deficiency.Methods: The study was carried from August to October2012. Fourteen SD rats were randomly and evenly allocated t...Purpose: To establish an animal model of autologous oral mucosa grafting for limbal stem cell deficiency.Methods: The study was carried from August to October2012. Fourteen SD rats were randomly and evenly allocated to study group A and control group B. Limbal stem cell deficiency was established by alkali burn in the right eye of each rat in both groups. Rats in group A received autologous oral mucosa strip transplantation following the chemical burn. Rats in group B did not receive surgery after the chemical burn.Topical antibiotics and dexamethasone were used in all rats.Corneal clarity, corneal fluorescein staining, oral mucosal graft survival, and complications at postoperative days 1,3,7,14 were observed.Results: The oral mucosa strip graft was detached in one rat in group A. Reepithelialization was observed starting from the graft position and was completed within 14 days in the remaining 6 eyes in group A. However, persistent corneal epithelium defect was observed in all eyes in group B, among which corneal melting and perforation was observed in 2 eyes and corneal opacification with neovascularization was observed in the remaining 5 eyes.Conclusion: Autologous oral mucosa strip grafting for limbal stem cell deficiency can be achieved by a rat model following chemical burn. The fate of the transplanted oral mucosal epithelial cells warrants further study.展开更多
Corneal diseases are a major cause of blindness in the world. Although great progress has been achieved in the treatment of corneal diseases, wound healing after severe corneal damage and immunosuppressive therapy aft...Corneal diseases are a major cause of blindness in the world. Although great progress has been achieved in the treatment of corneal diseases, wound healing after severe corneal damage and immunosuppressive therapy after corneal transplantation remain prob-lematic. Mesenchymal stem cells(MSCs) derived from bone marrow or other adult tissues can differentiate into various types of mesenchymal lineages, such as osteocytes, adipocytes, and chondrocytes, both in vivo and in vitro. These cells can further differentiate into specific cell types under specific conditions. MSCs migrate to injury sites and promote wound healing by secreting anti-inflammatory and growth factors. In ad-dition, MSCs interact with innate and acquired immune cells and modulate the immune response through their powerful paracrine function. Over the last decade, MSCs have drawn considerable attention because of their beneficial properties and promising therapeutic prospective. Furthermore, MSCs have been applied to various studies related to wound healing, autoim-mune diseases, and organ transplantation. This review discusses the potential functions of MSCs in protecting corneal tissue and their possible mechanisms in corneal wound healing and corneal transplantation.展开更多
Major advances are currently being made in regenerative medicine for cornea. Stem cell-based therapies represent a novel strategy that may substitute conventional corneal transplantation, albeit there aremany challeng...Major advances are currently being made in regenerative medicine for cornea. Stem cell-based therapies represent a novel strategy that may substitute conventional corneal transplantation, albeit there aremany challenges ahead given the singularities of each cellular layer of the cornea. This review recapitulates the current data on corneal epithelial stem cells, corneal stromal stem cells and corneal endothelial cell progenitors. Corneal limbal autografts containing epithelial stem cells have been transplanted in humans for more than 20 years with great successful rates, and researchers now focus on ex vivo cultures and other cell lineages to transplant to the ocular surface. A small population of cells in the corneal endothelium was recently reported to have self-renewal capacity, although they do not proliferate in vivo. Two main obstacles have hindered endothelial cell transplantation to date: culture protocols and cell delivery methods to the posterior cornea in vivo. Human corneal stromal stem cells have been identified shortly after the recognition of precursors of endothelial cells. Stromal stem cells may have the potential to provide a direct cell-based therapeutic approach when injected to corneal scars. Furthermore, they exhibit the ability to deposit organized connective tissue in vitro and may be useful in corneal stroma engineering in the future. Recent advances and future perspectives in the field are discussed.展开更多
目的:探究角膜缘干细胞移植术与羊膜移植术联合胬肉切除对翼状胬肉患者角膜上皮修复的影响及其美学效果。方法:选取2019年3月-2021年3月于笔者医院就诊的82例翼状胬肉患者的临床资料,根据手术方式分为羊膜组(n=40)和角膜组(n=42)。统计...目的:探究角膜缘干细胞移植术与羊膜移植术联合胬肉切除对翼状胬肉患者角膜上皮修复的影响及其美学效果。方法:选取2019年3月-2021年3月于笔者医院就诊的82例翼状胬肉患者的临床资料,根据手术方式分为羊膜组(n=40)和角膜组(n=42)。统计两组患者围术期指标,比较两组患者术前及术后3个月眼表泪液指标、视力指标、角膜上皮功能,对比两组患者术后3个月后美学效果,并记录两组患者术后3个月内不良反应发生情况。结果:角膜组患者手术时长长于羊膜组(P<0.05);角膜组患者眼部刺激症状消失时间、角膜上皮修复时间短于羊膜组(P<0.05);术后3个月后,两组患者泪膜破裂时间(Break-up time,BUT)、基础泪液分泌实验(Schirmer I test,SIT)结果高于术前,且角膜组高于羊膜组(P<0.05);术后3个月后,两组患者裸眼视力(Uncorrectedvisualacuity,UCVA)、角膜散光度及角膜上皮荧光素染色评分(Fluorescent,FL)均低于术前,且角膜组低于羊膜组(P<0.05);术后3个月,角膜组美学优良率高于羊膜组(P<0.05);术后3个月内,两组患者不良事件发生率比较差异无统计学意义(P>0.05)。结论:角膜缘干细胞移植术与羊膜移植术在翼状胬肉患者的临床治疗中均可取得较好的治疗及美学效果,且可有效改善患者眼表泪液系统及角膜上皮功能,具有较好的安全性,但角膜缘干细胞移植术对患者各项指标改善效果更佳。展开更多
基金Young Teachers Cultivation Project of Sun Yat-sen University(10ykpy25)Doctoral Program of the Ministry of Education(20110171120104)Science and Technology Programs of Guangdong Province(2010B060200008,201213031800456)
文摘Purpose: To establish an animal model of autologous oral mucosa grafting for limbal stem cell deficiency.Methods: The study was carried from August to October2012. Fourteen SD rats were randomly and evenly allocated to study group A and control group B. Limbal stem cell deficiency was established by alkali burn in the right eye of each rat in both groups. Rats in group A received autologous oral mucosa strip transplantation following the chemical burn. Rats in group B did not receive surgery after the chemical burn.Topical antibiotics and dexamethasone were used in all rats.Corneal clarity, corneal fluorescein staining, oral mucosal graft survival, and complications at postoperative days 1,3,7,14 were observed.Results: The oral mucosa strip graft was detached in one rat in group A. Reepithelialization was observed starting from the graft position and was completed within 14 days in the remaining 6 eyes in group A. However, persistent corneal epithelium defect was observed in all eyes in group B, among which corneal melting and perforation was observed in 2 eyes and corneal opacification with neovascularization was observed in the remaining 5 eyes.Conclusion: Autologous oral mucosa strip grafting for limbal stem cell deficiency can be achieved by a rat model following chemical burn. The fate of the transplanted oral mucosal epithelial cells warrants further study.
文摘Corneal diseases are a major cause of blindness in the world. Although great progress has been achieved in the treatment of corneal diseases, wound healing after severe corneal damage and immunosuppressive therapy after corneal transplantation remain prob-lematic. Mesenchymal stem cells(MSCs) derived from bone marrow or other adult tissues can differentiate into various types of mesenchymal lineages, such as osteocytes, adipocytes, and chondrocytes, both in vivo and in vitro. These cells can further differentiate into specific cell types under specific conditions. MSCs migrate to injury sites and promote wound healing by secreting anti-inflammatory and growth factors. In ad-dition, MSCs interact with innate and acquired immune cells and modulate the immune response through their powerful paracrine function. Over the last decade, MSCs have drawn considerable attention because of their beneficial properties and promising therapeutic prospective. Furthermore, MSCs have been applied to various studies related to wound healing, autoim-mune diseases, and organ transplantation. This review discusses the potential functions of MSCs in protecting corneal tissue and their possible mechanisms in corneal wound healing and corneal transplantation.
文摘Major advances are currently being made in regenerative medicine for cornea. Stem cell-based therapies represent a novel strategy that may substitute conventional corneal transplantation, albeit there aremany challenges ahead given the singularities of each cellular layer of the cornea. This review recapitulates the current data on corneal epithelial stem cells, corneal stromal stem cells and corneal endothelial cell progenitors. Corneal limbal autografts containing epithelial stem cells have been transplanted in humans for more than 20 years with great successful rates, and researchers now focus on ex vivo cultures and other cell lineages to transplant to the ocular surface. A small population of cells in the corneal endothelium was recently reported to have self-renewal capacity, although they do not proliferate in vivo. Two main obstacles have hindered endothelial cell transplantation to date: culture protocols and cell delivery methods to the posterior cornea in vivo. Human corneal stromal stem cells have been identified shortly after the recognition of precursors of endothelial cells. Stromal stem cells may have the potential to provide a direct cell-based therapeutic approach when injected to corneal scars. Furthermore, they exhibit the ability to deposit organized connective tissue in vitro and may be useful in corneal stroma engineering in the future. Recent advances and future perspectives in the field are discussed.
文摘目的:探究角膜缘干细胞移植术与羊膜移植术联合胬肉切除对翼状胬肉患者角膜上皮修复的影响及其美学效果。方法:选取2019年3月-2021年3月于笔者医院就诊的82例翼状胬肉患者的临床资料,根据手术方式分为羊膜组(n=40)和角膜组(n=42)。统计两组患者围术期指标,比较两组患者术前及术后3个月眼表泪液指标、视力指标、角膜上皮功能,对比两组患者术后3个月后美学效果,并记录两组患者术后3个月内不良反应发生情况。结果:角膜组患者手术时长长于羊膜组(P<0.05);角膜组患者眼部刺激症状消失时间、角膜上皮修复时间短于羊膜组(P<0.05);术后3个月后,两组患者泪膜破裂时间(Break-up time,BUT)、基础泪液分泌实验(Schirmer I test,SIT)结果高于术前,且角膜组高于羊膜组(P<0.05);术后3个月后,两组患者裸眼视力(Uncorrectedvisualacuity,UCVA)、角膜散光度及角膜上皮荧光素染色评分(Fluorescent,FL)均低于术前,且角膜组低于羊膜组(P<0.05);术后3个月,角膜组美学优良率高于羊膜组(P<0.05);术后3个月内,两组患者不良事件发生率比较差异无统计学意义(P>0.05)。结论:角膜缘干细胞移植术与羊膜移植术在翼状胬肉患者的临床治疗中均可取得较好的治疗及美学效果,且可有效改善患者眼表泪液系统及角膜上皮功能,具有较好的安全性,但角膜缘干细胞移植术对患者各项指标改善效果更佳。
