Limbal stem cells: Central concepts of corneal epithelial homeostasis

A strong cohort of evidence exists that supports the localisation of corneal stem cells at the limbus. The distinguishing characteristics of limbal cells as stem cells include slow cycling properties, high proliferative potential when required, clonogenicity, absence of differentiation marker expression coupled with positive expression of progenitor markers, multipotency, centripetal migration, requirement for a distinct niche environment and the ability of transplanted limbal cells to regenerate the entire corneal epithelium. The existence of limbal stem cells supports the prevailing theory of corneal homeostasis, known as the XYZ hypothesis where X represents proliferation and stratification of limbal basal cells, Y centripetal migration of basal cells and Z desquamation of superficial cells. To maintain the mass of cornea, the sum of X and Y must equal Z and very elegant cell tracking experiments provide strong evidence in support of this theory. However, several recent stud-ies have suggested the existence of oligopotent stem cells capable of corneal maintenance outside of the limbus. This review presents a summary of data which led to the current concepts of corneal epithelial homeostasis and discusses areas of controversy surrounding the existence of a secondary stem cell reservoir on the corneal

Transplantation of tissue-engineered human corneal epithelium in limbal stem cell deficiency rabbit models

AIM: To evaluate the biological functions of tissue-engineered human corneal epithelium (TE-HCEP) by corneal transplantation in limbal stem cell deficiency (LSCD) rabbit models. METHODS: TE-HCEPs were reconstructed with DiI-labeled untransfected HCEP cells and denuded amniotic membrane (dAM) in air-liquid interface culture, and their morphology and structure were characterized by hematoxylin-eosin (HE) staining of paraffin-sections, immunohistochemistry and electron microscopy. LSCD models were established by mechanical and alcohol treatment of the left eyes of New Zealand white rabbits, and their eyes were transplanted with TE-HCEPs with dAM surface outside by lamellar keratoplasty (LKP). Corneal transparency, neovascularization, thickness, and epithelial integrality of both traumatic and post transplantation eyes were checked once a week by slit-lamp corneal microscopy, a corneal pachymeter, and periodic acid-Schiff (PAS) staining. At day 120 post surgery, the rabbits in each group were sacrificed and their corneas were examined by DiI label observation, HE staining, immunohistochemistry and electron microscopy. RESULTS: After cultured for 5 days on dAM, HCEP cells, maintaining keratin 3 expression, reconstructed a 6-7 layer TE-HCEP with normal morphology and structure. The traumatic rabbit corneas, entirely opaque, conjunctivalized and with invaded blood vessels, were used as LSCD models for TE-HCEP transplantation. After transplantation, obvious edema was not found in TE-HCEP-transplanted corneas which became more and more transparent, the invaded blood vessels reduced gradually throughout the monitoring period. The corneas decreased to normal thickness on day 25, while those of dAM eyes were over 575 mu m in thickness during the monitoring period. A 45 layer of epithelium consisting of TE-HCEP originated cells attached tightly to the anterior surface of stroma was reconstructed 120 days after TE-HCEP transplantation, which was similar to the normal control eye in morphology and structure. In contrast, intense corneal edema, turbid, invaded blood vessels were found in dAM eyes, and no multilayer epithelium was found but only a few scattered conjunctiva-like cells appeared. CONCLUSION: The TE-HCEP, with similar morphology and structure to those of innate HCEP, could reconstruct a multilayer corneal epithelium with normal functions in restoring corneal transparency and thickness of LSCD rabbits after transplantation. It may be a promising HCEP equivalent for clinical therapy of corneal epithelial disorders.

Quantification of corneal neovascularization after ex vivo limbal epithelial stem cell therapy

AIM: To assess cultured limbal epithelial stem cell transplantation in patients with limbal stem cell deficiency by analyzing and quantifying corneal neovascularization.METHODS: This retrospective, interventional case series included eight eyes with total limbal stem cell deficiency. Ex vivo limbal epithelial stem cells were cultured on human amniotic membrane using an animalfree culture method. The clinical parameters of limbal stem cell deficiency, impression cytology, and quantification of corneal neovascularization were evaluated before and after cultured limbal stem cell transplantation. The area of corneal neovascularization,vessel caliber(VC), and invasive area(IA) were analyzed before and after stem cell transplantation by image analysis software. Best-corrected visual acuity(BCVA),epithelial transparency, and impression cytology were also measured.RESULTS: One year after surgery, successful cases showed a reduction(improvement) of all three parameters of corneal neovascularization [neovascular area(NA), VC, IA], while failed cases did not. NA decreased a mean of 32.31%(P =0.035), invasion area29.37%(P =0.018) and VC 14.29%(P =0.072). BCVA improved in all eyes(mean follow-up, 76 ±21mo).Epithelial transparency improved significantly from 2.00 ±0.93 to 0.88±1.25(P =0.014). Impression cytology showed that three cases failed after limbal epithelial stem cell therapy before 1y of follow-up.CONCLUSION: This method of analyzing andmonitoring surface vessels is useful for evaluating the epithelial status during follow-up, as successful cases showed a bigger reduction in corneal neovascularization parameters than failed cases. Using this method,successful cases could be differentiated from failed cases.

Evaluating alternative stem cell hypotheses for adult corneal epithelial maintenance

In this review we evaluate evidence for three different hypotheses that explain how the corneal epithelium is maintained. The limbal epithelial stem cell(LESC)hypothesis is most widely accepted. This proposes that stem cells in the basal layer of the limbal epithelium, at the periphery of the cornea, maintain themselves and also produce transient(or transit) amplifying cells(TACs). TACs then move centripetally to the centre of the cornea in the basal layer of the corneal epithelium and also replenish cells in the overlying suprabasal layers. The LESCs maintain the corneal epithelium during normal homeostasis and become more active to repair significant wounds. Second, the corneal epithelial stem cell(CESC) hypothesis postulates that, during normal homeostasis, stem cells distributed throughout the basal corneal epithelium, maintain the tissue. According to this hypothesis, LESCs are present in the limbus but are only active during wound healing. We also consider a third possibility, that the corneal epithelium is maintained during normal homeostasis by proliferation of basal corneal epithelial cells without any input from stem cells. After reviewing the published evidence, we conclude that the LESC and CESC hypotheses are consistent with more of the evidence than the third hypothesis, so we do not consider this further. The LESC and CESC hypotheses each have difficulty accounting for one main type of evidence so we evaluate the two key lines of evidence that discriminate between them. Finally, we discuss how lineage-tracing experiments have begun to resolve the debate in favour of the LESC hypothesis. Nevertheless, it also seems likely that some basal corneal epithelial cells can act as long-term progenitors if limbal stem cell function is compromised. Thus, this aspect of the CESC hypothesis may have a lasting impact on our understanding of corneal epithelial maintenance, even if it is eventually shown that stem cells are restricted to the limbus as proposed by the LESC hypothesis.

Corneal stem cells and tissue engineering: Current advances and future perspectives

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.

Induced pluripotent stem cells as a potential therapeutic source for corneal epithelial stem cells

Corneal blindness caused by limbal stem cell deficiency(LSCD) is one of the most common debilitating eye disorders. Thus far, the most effective treatment for LSCD is corneal transplantation, which is often hindered by the shortage of donors. Pluripotent stem cell technology including embryonic stem cells(ESCs) and induced pluripotent stem cells(iPSCs) have opened new avenues for treating this disease. iPSCs-derived corneal epithelial cells provide an autologous and unlimited source of cells for the treatment of LSCD. On the other hand, iPSCs of LSCD patients can be used for iPSCs-corneal disease model and new drug discovery. However, prior to clinical trial, the efficacy and safety of these cells in patients with LSCD should be proved. Here we focused on the current status of iPSCs-derived corneal epithelial cells used for cell therapy as well as for corneal disease modeling. The challenges and potential of iPSCs-derived corneal epithelial cells as a choice for clinical treatment in corneal disease were also discussed.

Cryopreserved limbal lamellar keratoplasty for peripheral corneal and limbal reconstruction

This study aimed to evaluate the outcomes and described the recovery process of cryopreserved limbal lamellar keratoplasty（CLLK） for peripheral corneal and limbal diseases. Thirteen eyes of 12 patients with a mean age of 41±23.9 y were included. The average follow-up was 12.1±5.6 mo. Stable ocular surface was achieved in all eyes at last follow-up. Epithelialization originated from both recipient and graft in 9 eyes. We conclude that CLLK compensates for the shortage of donor corneas and cryopreserved limbal grafts provide epithelialization sources in ocular surface reconstruction.

除风益损汤加减方对翼状胬肉术后眼表损伤修复的作用探究

目的:探讨除风益损汤加减方对翼状胬肉术后眼表损伤修复的影响。方法:纳入研究的100例原发性翼状胬肉患者随机分为观察组和对照组,各50例。2组均接受翼状胬肉切除联合角膜缘干细胞移植手术,其中对照组术后采用常规滴眼液点眼治疗,观察组在对照组的基础上联合口服除风益损汤加减方治疗,用药1周。比较2组术后眼部疼痛评分、眼部体征、泪膜破裂时间、角膜状态及复发率的差异。结果:术后1日、2日、1周2组眼部疼痛评分均优于术后6h,差异均有统计学意义;观察组眼部疼痛评分评分优于对照组,差异有统计学意义;术后2日、1周2组眼部体征积分均优于术后1日,差异均有统计学意义;观察组眼部体征积分优于对照组,差异有统计学意义;术后1周观察组泪膜破裂时间及角膜状态评分均优于对照组,差异均有统计学意义;术后随访6个月,观察组复发率低于对照组,差异有统计学意义。结论:除风益损汤加减方可促进翼状胬肉切除联合角膜缘干细胞移植术后眼表损伤的修复。

切除联合自体角膜缘干细胞移植术治疗原发性翼状胬肉的研究

目的探讨翼状胬肉切除联合自体角膜缘干细胞移植术治疗原发性翼状胬肉的临床效果及安全性。方法回顾性研究2019年1月至2023年1月在本院接受原发性翼状胬肉手术治疗的66例患者病历资料,将66例患者根据手术方式的不同分为对照组(n=33,翼状胬肉切除联合游离结膜瓣移植术)及试验组(n=33,翼状胬肉切除联合自体角膜缘干细胞移植术)。比较两组临床效果、术后结膜瓣愈合时间、角膜上皮修复时间,记录术前及术后1个月、3个月、6个月泪膜破裂时间(TBUT)变化及术后并发症发生率和术后6个月的复发率。结果试验组患者治疗后的临床疗效高于对照组,术后结膜瓣愈合时间、角膜上皮修复时间明显短于对照组,术后的1月、3月、6月时TBUT时间明显长于对照组(P<0.05);两组术后并发症的发生率及复发率比较,差异无统计学意义(P>0.05)。结论翼状胬肉切除联合自体角膜缘干细胞移植术治疗原发性翼状胬肉具有良好的治疗效果和安全性,可降低术后复发率,且不增加术后并发症发生率。

翼状胬肉切除联合角膜缘干细胞移植术治疗翼状胬肉的临床效果探讨

目的探讨翼状胬肉切除联合角膜缘干细胞移植(Corneal Limbal Stem Cell Transplantation,CAT)术治疗翼状胬肉的临床效果。方法随机选取2022年12月—2023年10月新疆伊宁市农四师医院收治的60例翼状胬肉患者作为研究对象,采用随机数表法分为两组。对照组(30例)行翼状胬肉切除+自体结膜瓣缘干细胞移植术(Autologous Conjunctival Flap Stem Cell Transplantation,LCAT)处理,观察组(30例)行翼状胬肉切除+CAT术处理。对比两组的泪膜功能[泪膜破裂时间(Break-up Time,BUT)、泪液分泌试验(Schirmer Test,SIT)]、视力水平[裸眼视力(Naked Vision,UCVA)、角膜屈光度]以及术后并发症发生状况。结果术后3个月,两组的BUT与SIT泪膜功能指标均高于术前,但组间对比,差异无统计学意义(P均>0.05)。术后3个月,两组UCVA值高于术前,角膜屈光度小于术前,但组间对比,差异无统计学意义(P均>0.05)。观察组与对照组术后并发症发生率对比(10.00%vs 6.67%),差异无统计学意义(P>0.05)。结论翼状胬肉切除+CAT术式用于翼状胬肉患者的处理,其安全性、视力及泪膜功能改善效果与翼状胬肉切除+LCAT术式相当。

连续缝合埋线法在翼状胬肉切除联合角膜缘干细胞移植术中的应用

目的探讨连续缝合埋线法在翼状胬肉切除联合角膜缘干细胞移植术中的应用疗效。方法70例原发性翼状胬肉患者随机分为观察组和对照组。两组均采用翼状胬肉切除联合角膜缘干细胞移植原位缝合术治疗,对照组采用间断缝合法,观察组采用连续缝合埋线法。比较两组的疼痛评分、眼表体征评分、泪膜破裂时间、并发症及复发率。结果(1)术后6小时两组疼痛评分无统计学差异(Z=-0.314,P=0.754);术后1日、2日观察组疼痛评分均低于对照组(Z_(术后第1日)=-2.842,P_(术后第1日)=0.004;Z_(术后第2日)=-2.403,P_(术后第2日)=0.016)。(2)术后1日、2日观察组眼表体征均优于对照组(Z_(术后第1日)=-2.446,P_(术后第1日)=0.014;Z_(术后第2日)=-2.526,P_(术后第2日)=0.012);术后1周两组眼表体征无统计学差异(Z=-1.358,P=0.175)。(3)术后1周观察组泪膜破裂时间优于对照组(t=2.135,P=0.036),术后4周两组泪膜破裂时间无统计学差异(t=0.989,P=0.326)。(4)术后4周及术后3个月观察组眼表并发症评分均优于对照组(Z_(术后第4周)=-2.019,P_(术后第4周)=0.044;Z_(术后第3月)=-2.945,P_(术后第3月)=0.003)。(5)两组复发率无统计学差异(P=0.607)。结论翼状胬肉切除及角膜缘干细胞移植术中采用连续缝合埋线法,可缓解术后的眼部刺激症状、减轻眼表炎症、促进眼表重建。

人胚胎干细胞来源角膜上皮样细胞用于治疗兔角膜缘干细胞缺乏

目的 通过小分子化合物诱导人胚胎干细胞(human embryonic stem cells, hESCs)分化为角膜上皮样细胞,观察角膜上皮样细胞治疗兔角膜缘干细胞缺乏(limbal stem cell deficiency, LSCD)的效果。方法 利用拟胚体联合小分子化合物方法,将hESCs H9细胞系向角膜上皮样细胞分化,将角膜上皮样细胞在去上皮羊膜片上培养构建重组细胞膜片。选取造模成功的12只LSCD兔,按照随机数表法分为对照组和实验组,对照组接受去上皮的的羊膜片治疗,实验组接受角膜上皮样细胞膜片移植治疗。术后通过裂隙灯、前节照相等方法,对角膜透明度、新生血管、荧光素钠染色情况进行评分,并于移植后4周观察角膜病理切片结构。结果 成功将hESCs诱导为角膜上皮样细胞,细胞形状和结构类似角膜上皮细胞。病理结果显示,实验组的角膜形成复层上皮结构,上皮下炎症细胞浸润轻,治疗效果明显优于对照组。进行细胞移植治疗后发现,实验组的角膜透明度高、新生血管少,角膜评分明显优于对照组(P<0.05)。诱导后的角膜上皮样细胞的角膜上皮标记物ΔNP63和CK12的表达与hESCs H9相比差异具有统计学意义(P<0.05)。结论 采用拟胚体联合小分子化合物可以成功诱导出角膜上皮样细胞,角膜上皮样细胞膜片移植到兔体内后可有效治疗LSCD。

软性接触镜和重组牛碱性成纤维生长因子滴眼液对自体角膜缘干细胞移植胬肉术后疗效对比

目的比较软性接触镜(SCL)和重组牛碱性成纤维生长因子(rb-bFGF)滴眼液对自体角膜缘干细胞移植(LSCT)胬肉术后疗效的影响。方法通过前瞻性对照研究,收集行手术治疗的翼状胬肉患者150例共150眼,按照随机数字表法分为3组,除每例术后予左氧氟沙星滴眼液、氟米龙滴眼液和典必殊眼膏(妥布霉素地塞米松眼膏)外,A组术后予佩戴SCL、B组术后予加滴rb-bFGF滴眼液、C组为对照组,比较3组患者术后疼痛、异物感、畏光症状的视觉模拟量表(VAS)评分、泪膜破裂时间(BUT)、泪液分泌试验(SIt)、最佳矫正视力(BCVA)、角膜上皮修复时间及复发率情况。结果观察3组患者术后1、7和30 d疼痛、异物感、畏光症状的VAS评分,术后不适症状明显好转,且A、B组患者的VAS评分低于C组,进一步比较A、B组,差别也有统计学意义(P<0.05)。3组患者术前的BUT和SIt比较,差别均无统计学意义(P>0.05);术后3个月,3组患者的BUT和SIt比较,差别有统计学意义(P<0.05),且A、B组患者的BUT和SIt值高于C组,但A、B组间差别无统计学意义(P>0.05)。术后3个月,3组患者的BCVA均较术前明显改善,差别有统计学意义(P<0.05),且A、B组患者的BCVA高于C组,但A、B组间差别无统计学意义(P>0.05)。3组患者角膜上皮修复时间比较,差别有统计学意义(F=55.115,P<0.05),且A、B组患者角膜上皮修复快于C组,但A、B组间差别无统计学意义(P>0.05)。术后6个月,3组患者的术后复发率比较,差别均无统计学意义(χ2=1.288,P>0.05)。结论SCL在早期可有效缓解LSCT胬肉术后的不适症状,rb-bFGF滴眼液和SCL治疗LSCT胬肉术后的疗效确切、安全可靠,均可以改善眼表的状态,维持泪膜的稳定性,促进术后角膜修复。

Differentiation of embryonic stem cells into corneal epithelium

Our project was to determine whether embryonic stem (ES) cells could be induced to differentiate into corneal epithelia by superficial corneoscleral limbal stroma. To achieve this goal, ES-GFP cell line D3 was pre-induced by retinoic acid (RA). The pre-induced cells were seeded on deepithelialized superficial corneoscleral slices (SCSS) to form a monolayer, and di-vided into three groups. Group 1 was cultured and passaged in vitro for direct detection. Group 2 was exposed to air-liquid interfaces for 10 days and implanted into the subcutaneous layer of nude mice for 2 weeks for further induction in vivo. Group 3 was cultured in vitro without any in-ducing factors for control. There were no teratomas found in nude mice which were implanted with differentiated ES cells after two weeks. The differentiated cells showed an appearance of epithelia both in vitro and in vivo. Expression of CK3, P63 and PCNA was detected by immuno-histochemical staining in the differentiated cells in group 1 and 2. Microvillis and zonula oc-cludens were observed on the surface of the differentiated cells under an electron microscope. In the control group, ES cells differentiated freely without any inducing factors. Most cells were shed and formed a neuronal dendrite-like structure, and a minority of cells appeared polymorphic. These results demonstrate that ES cells can differentiate into corneal epithelia on the surface of SCSS under the controlled condition. Differentiated ES cells could be used as epithelial seeding cells for the reconstruction of ocular surface and corneal tissue engineering in the future.

翼状胬肉切除术联合角膜缘干细胞移植术治疗翼状胬肉的临床疗效

目的探究翼状胬肉切除术联合角膜缘干细胞移植术治疗翼状胬肉的临床疗效。方法选取2020年1—12月本院收治的94例翼状胬肉患者作为研究对象,按抽签法分为参照组与联合组,各47例。参照组行翼状胬肉切除术治疗,联合组在参照组基础上联合角膜缘干细胞移植术治疗,比较两组治疗前后散光和视力改善情况、临床疗效及并发症发生率。结果治疗前,两组角膜散光度和裸眼视力比较差异无统计学意义;治疗后,两组角膜散光度均低于治疗前,裸眼视力均高于治疗前,且联合组角膜散光度低于参照组,裸眼视力高于参照组,差异有统计学意义(P<0.05)。联合组治疗总有效率为95.74%,高于参照组的76.60%,差异有统计学意义(P<0.05)。联合组并发症发生率为8.51%,低于参照组的27.66%,差异有统计学意义(P<0.05)。结论翼状胬肉切除术联合角膜缘干细胞移植术治疗翼状胬肉疗效确切,有利于改善患者视力情况,降低术后并发症发生率,值得临床推广应用。

两种不同移植术联合胬肉切除治疗翼状胬肉的美学效果及对角膜上皮修复的影响

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。

翼状胬肉切除术后行两种不同移植方案治疗翼状胬肉的效果对比

目的比较翼状胬肉切除术后行两种不同移植方案治疗翼状胬肉的效果。方法选取2020年6月至2021年6月瑞金市人民医院收治的108例(108眼)翼状胬肉患者作为研究对象,按照随机数字表法分为A组与B组,每组54例(54眼)。A组采用翼状胬肉切除联合羊膜移植术治疗,B组采用翼状胬肉切除联合带角膜缘干细胞的自体结膜移植术治疗。比较两组临床疗效、最佳矫正视力、眼表疾病指数(OSDI)评分、泪膜功能指标、术后并发症发生情况。结果术后3个月,B组治疗总有效率高于A组,差异有统计学意义(P<0.05)。术后3个月,两组OSDI评分均低于术前,且B组低于A组,差异有统计学意义(P<0.05)。术后3个月,两组最佳矫正视力均优于术前,且B组优于A组,差异有统计学意义(P<0.05)。术后3个月,两组BUT、SⅠT均长于术前,且B组长于A组,差异有统计学意义(P<0.05)。术后3个月期间,两组均未发生现胬肉组织增生或新生血管等相关并发症。结论翼状胬肉切除联合带角膜缘干细胞的自体结膜移植术及羊膜移植均可有效改善泪膜功能,减轻干眼症症状,但联合带角膜缘干细胞的自体结膜移植术更利于患者术后泪膜功能及干眼症状的改善。

自体角膜缘干细胞移植和自体游离球结膜移植治疗翼状胬肉的疗效观察

目的:比较翼状胬肉切除联合自体角膜缘干细胞移植术或自体球结膜移植术与单纯翼状胬切除术对初发性翼状胬肉的疗效。方法:将初发性翼状胬肉患者100例(105眼)随机分为3组,A组38例(38眼),行单纯翼状胬肉切除术;B组32例(33眼),行翼状胬肉切除+自体角膜缘干细胞移植术;C组30例(34眼),行翼状胬肉切除+自体游离球结膜移植术。术后随访12mo,观察3组患者翼状胬肉复发情况及B组和C组角膜创面上皮修复时间。结果:A组复发15眼,复发率为39.5%;B组复发1眼,复发率为3.0%;C组复发6眼,复发率为17.6%。复发率的比较:与A组相比,B、C组复发率降低,比较前者有非常显著性差异(P=0.00002);后者有显著性差异(P=0.04);B组和C组比较无显著性差异(P=0.0505)。角膜创面上皮修复时间B组为(3.48±0.83)d,C组为(5.29±0.87)d,B组快于C组,二者比较有非常显著性差异(F=75.33,P<0.0001)。结论:对初发性翼状胬肉,翼状胬肉切除联合自体角膜缘干细胞移植或联合自体游离球结膜移植均能有效降低其复发率,前者恢复角膜表型较后者更为优越。

翼状胬肉切除联合自体角膜缘干细胞移植与联合羊膜移植的疗效比较

目的:探讨翼状胬肉手术切除联合自体角膜缘干细胞移植术与联合羊膜移植术临床疗效对比。方法:选择本院2007-03/2010-03收治的角膜缘翼状胬肉患者90例90眼,均单眼手术,随机分为两组,角膜移植组给予手术切除联合自体角膜缘干细胞移植,羊膜移植组给予手术切除胬肉联合羊膜移植治疗,观察两组治疗效果。结果:两组术后随访2a,角膜移植组术后创面愈合时间短于羊膜移植组,差异有统计学意义(P<0.05),角膜移植组术后治愈42例,复发3例;羊膜移植组术后治愈39例,复发6例,两组术后复发率比较,差异有统计学意义(P<0.05)。结论:手术切除联合角膜缘干细胞移植治疗翼状胬肉,术后复发率低,并发症少,愈合时间短,值得应用。

自体角膜缘干细胞移植对翼状胬肉患者视觉质量及泪膜功能的影响

目的探讨翼状胬肉切除术联合自体角膜缘干细胞移植对翼状胬肉患者视觉质量、角膜屈光及泪膜功能的影响。方法选取2016年2月～2017年1月在我院治疗的翼状胬肉患者110例,随机分为对照组和观察组,每组55例。对照组给予翼状胬肉切除术治疗,观察组在对照组的基础上给予角膜缘干细胞移植,之后对两组患者视力、角膜屈光度、泪膜功能及术后巩膜并发症进行评估。结果与治疗前相比,治疗后两组患者视力、角膜水平曲度及角膜垂直曲度均显著增加,角膜散光度较治疗之前显著下降,且观察组治疗后视力、角膜水平曲度及角膜垂直曲度显著大于对照组,角膜散光度显著低于对照组,差异有统计学意义(P<0.05);与治疗前相比,治疗后两组患者基础泪液分泌试验(SIT)及泪膜破裂时间(BUT)水平均显著上升,且观察组治疗后显著高于对照组,差异有统计学意义(P<0.05);术后6个月,观察组眼部刺激症状、巩膜溶解软化及巩膜坏死发生率均显著低于对照组,差异有统计学意义(P<0.05)。结论角膜缘干细胞移植联合翼状胬肉切除能有效提高患者视力,增加角膜屈光度,降低患者散光程度,并能有效改善泪膜功能,降低巩膜并发症的发生率。