Name: establishment of a clinically relevant ex vivo mock cataract surgery model for investigating epithelial wound repair in a native microenvironment
Uploaded: 2015-06-05T15:00:00.000+00:00
Duration: 7 min 53 s
Description: Watch this Scientific Journal Video about Establishment of a Clinically Relevant Ex Vivo Mock Cataract Surgery Model for Investigating Epithelial Wound Repair in a Native Microenvironment at JoVE.com

This work was supported by National Institutes of Health Grant to A.S.M. (EY021784).

下面的协议符合托马斯·杰斐逊大学机构动物护理和使用委员会的指导方针，并与ARVO声明为动物的视觉研究使用。 1.安装镜头，并准备于离体培养伤口<ol><li>将3座100 25mm培养皿在无菌的层流罩。填充两个的中途用Tris /葡萄糖缓冲培养皿（TD缓冲器; 140 mM氯化钠，5mM的氯化钾，0.7毫的Na 2 PO 4，5mM的D-葡萄糖，8.25毫摩尔Tris碱，pH值至7.4，用HCl）在RT ，留下第三空。预暖培养基（媒体199补充有1％L-谷氨酰胺和1％青霉素/链霉素）至37℃。 注意:标准伤口愈合的培养基是无血清，如发生在体内 ;然而，在伤口修复培养可以成功地在确定的培养基条件包括血清或其他因素生长。 </li><li>沃取出胚胎ðAY从孵化器15白来航鸡鸡蛋（37.7℃，温和的摇摆举行） </li><li>放置在层流罩和清洁外壳用70％的乙醇从洗瓶选择蛋。进行在层流罩下面在无菌条件下所有的程序，用无菌溶液和仪器。 </li><li>裂纹蛋和地点的内容为空百毫米培养皿。使用标准镊子和剪刀精胚斩首。将鸡胚头中含有的TD缓冲培养皿并适当处理的胚胎的其余部分。任选保持于TD缓冲鸡胚磁头的短时间内，不超过15分钟。 </li><li>将鸡胚头部上的培养皿盖。采用高精度镊子，随着从眼及其连接玻璃体以下顺序取下镜片。捏眼睛后部与镊子创建一个小的开口在眼睛的后部。 </li><li>然后，把握玻璃体W¯¯第i镊子轻轻用力拉玻璃体与滚动运动，附着在透镜玻璃体将从眼移位。地方镜头/玻璃体中含有TD缓冲区剩余的培养皿。让镜头留在TD缓冲的时间不能超过30分钟。 </li><li>移动透镜到一个新的培养皿盖子在解剖显微镜下。从这点上执行在解剖显微镜下的所有步骤。以高精度镊子小心刷掉任何睫状体（色素细胞），这些使用镊子的边缘，同时小心不要损坏晶状体组织脱落与透镜。 注意:卸下睫状体确保那些不是内源的透镜的细胞类型不包括在伤口修复培养。 </li><li>通过从与后晶状体囊关联夹断玻璃体分开玻璃体以高精度镊子镜头。 </li><li>采用高精度镊子镜头转移到小降TD的缓冲液（约200微升）在一个35mm的组织培养皿。 </li></ol> 2.执行模拟白内障手术<ol><li>定向在TD缓冲在35mm培养皿与透镜的朝上的前方面的下降的透镜。 注意:该透镜的前部很容易被致密环在该注意到的晶状体上皮的前部和赤道区域之间的边界的组织的存在识别。与此相反，存在于所述晶状体囊到的晶状体纤维细胞附着的后部不存在标记。 </li><li>使用两个高精度镊子作一小切口（大约850μm）的前晶状体囊中，粗基底膜围绕晶状体组织，和其相关联的前晶状体上皮的中心，通过抓住与一个钳组织中的每个手轻轻揪着相反方向。 </li><li>取出纤维细胞块，它构成了大部分的晶状体组织，dislod的从附件晋它的晶状体上皮和水力洗脱（经典白内障手术使用的方法，仿照图1A）周围的晶状体囊。 </li><li>填充1ml注射器用27.5ģ针尖与300微升的TD缓冲液中。插入针头尖端插入在晶状体前囊制成的切口，和大约一半到透镜。 </li><li>轻踏注射器注入TD缓冲区进入晶状体纤维细胞团。注入微升50至200 TD，且绝不超过300微升。观察纤维细胞团从上皮和晶状体囊放松自己。 </li><li>采用高精度镊子，通过前切口部位取下镜头松动的纤维细胞团。 注:此过程留下晶状体后基底膜囊到纤维细胞已附着在剥蚀细胞，和一个受伤的晶状体上皮只是毗邻这个网站。 </li></ol> 3. Preparin克受伤的镜头体外培养<ol><li>平坦化透镜囊袋而导致的上述的培养皿的白内障手术，细胞面朝上，通过使5削减囊袋的前方面。 </li><li>通过在透镜的赤道切割垂直于原始切口部位。弄平晶状体囊所得五"护翼"与培养皿胶囊侧附上皮下来，细胞侧朝上。注意体外受伤的镜头，现在需要一个明星或花形的形状（ 见图1B）。 </li><li>为了保证胶囊的菜，请用钳子轻轻向下在每个点的明星。这将使一个小凹部，外植体的五个最外的技巧，并导致持续附着到培养皿中。 注意:可以在此过程中损坏的胶囊，因此它以固定胶囊的菜接近的FLA的前端是重要ps的越好，以及使最少量的固定点的作为可能的（一般两，最多三个每瓣）。 </li><li>从35毫米培养皿中取出的TD缓冲器，并将其与1.5预热介质毫升替换。覆盖35mm的培养皿与其盖并置于培养箱（37℃，5％CO 2）。 </li></ol> 4.分离中央迁移区（CMZ），在那里再上皮后囊的创面的发生，从原始附件晶状体上皮细胞的区（OAZ），定量分析。 注:细胞开始响应损伤立即移动到CMZ区域。通过在培养一天足够的细胞迁移横跨CMZ分子和生化分析，继CMZ和OAZ通过显微解剖23分离。该协议涉及除去一个翼片（OAZ）中的从胶囊的受伤区域中的时间。 <ol><li>观察德玛尔阳离子，在解剖显微镜下清晰可见，在OAZ和CMZ之间（ 见图2A）。使用两个高精度镊子，两手抓，钳子在OAZ / CMZ线，一条仅仅相邻的其它的边缘，上线的两侧（参见图2A，B，箭头）。 </li><li>用一只手/在CMZ一边一个镊子继续守住伤员文化，同时用另一只手/镊子，轻轻一拉沿着OAZ / CMZ线OAZ。该CMZ容易分开沿着这条线的OAZ。沿围绕整个文化这条线继续下去，直到两个地区是完全分开的。 </li><li>研究分离OAZ和CMZ分数进行分子分析，例如RNA测序24或生化分析，如蛋白印迹或免疫共沉淀23,25。 </li></ol>

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The authors declare that they have no competing financial interests.

Here is described a technique for preparing a culture model of wound repair that involves performing an ex vivo cataract surgery on chick embryo lenses after their removal from the eye. The lens epithelium responds to this clinically relevant wounding with a repair process that closely mimics that which occurs in vivo, and shares features with wound repair in other epithelial tissues2,4. While the protocol is straightforward and simple to follow, performing mock cataract surgery with embryoni...

临床相关，模拟白内障手术，这里所描述的体外上皮伤口愈合模型的开发是为了提供调查，在响应于损伤调节修复上皮组织的机制的一种工具。在创建该模型旨在为关键特征包括1）提供条件精密地复制在体内响应于伤人在培养设置，2）缓和调制修复的调控元件，以及3）能力图像的修复过程中，其整体，在实际时间。我们面临的挑战，因此，是在细胞的天然微环境创造一种文化模式，即有可能学习和操作，上皮创面修复。这种创伤修复模型的有效性开辟了新的可能性，标识来自调节修复过程基质蛋白，细胞因子和趋化因子的内源性信号提示。另外，该模型是理想的研究如何一Ñ ​​上皮能够移动作为集体片重新epithelialize伤口区域2,3，和用于确定在伤口边缘起作用的引导受伤上皮4的集体迁移间充质领袖细胞的谱系。这种模式还提供了一个用以标识疗法，可以有效的促进伤口愈合，防止异常创面修复5的平台。 目前已经有许多可用的创伤修复模式，无论是在文化和体内 ，它提供了当今大多数所谓对伤口修复过程。在动物损伤模型，如角膜6-12和皮肤13-17，有研究的组织的响应伤人的所有修复介质是可以参与的过程中，包括来自所述的上下文中，机会血管和神经系统。但是，也有限制操纵experi体内的精神的条件下，它是目前无法进行体内修复反应的成像研究，随时间连续。与此相反，大多数体外伤口修复培养模型，如划痕，可以很容易地操纵和随后随着时间的推移，但缺乏研究伤口愈合中的体内组织的环境背景。虽然体外模型提供了细胞的微环境加上调节修复的分子调节的过程中的任何时间点的能力范围内不断研究损伤修复过程中随着时间的优势，很少有车型适合这些参数。 这里描述的方法，以产生高度可重复的离体上皮的伤口愈合是再现上皮组织的响应于生理伤人培养物。使用鸡胚镜头作为组织源， 体外 MOCķ白内障手术被执行。该透镜是一种理想的组织用于这些研究，因为它是自包含在一个厚的基底膜胶囊，无血管，没有神经支配，且没有任何相关联的基质18,19。在人类疾病，白内障手术涉及视力丧失，由于透镜的混浊，并且包括除去晶状体纤维细胞块，其包含大量的透镜组成。白内障手术后视力是通过人工眼内透镜的插入恢复。在白内障手术过程中，通过除去纤维细胞，诱导在相邻透镜上皮，这是为了响应通过再上皮晶状体囊的后部区域已被占用的纤维细胞的损伤的反应。在白内障手术中，因为在大多数伤口修复反应，还有，有时会发生的异常纤维化结果向伤口愈合反应，与肌纤维母细胞的出现，这在透镜被称为后验Capsu相关联乐混浊20-22。为了产生白内障手术伤口愈合的模型，一个白内障手术的过程是模仿从鸡胚眼中除去产生生理损伤镜头。显微手术切除晶状体纤维细胞导致的晶状体上皮细胞包围着一个非常一致的圆形伤口面积。该细胞群保持牢固地附着在透镜基底膜胶囊和由外科手术过程中受伤。上皮细胞迁移到内源性基底膜的裸露面积愈合伤口的带动下，在维修过程中被称为领导者细胞1波形丰富的间充质细胞群。用该模型的上皮损伤的响应可容易地可视化并随后随时间在细胞的微环境的上下文中。细胞是易于接触到的表达或活化有望发挥在伤口修复中的作用的分子的修饰。日的一项强大功能是模型是分离和研究在伤口愈合的框架迁移特异性改变的能力。准备大量老年匹配体外伤口愈合培养物用于研究的能力是该模型的另一优点。因此，这个模型系统提供了一个独特的机会，梳理出创面修复机制和试验治疗为他们的伤口愈合过程中的作用。预计在体外模拟白内障手术模式，具有广泛的适用性，为研究损伤修复机制的重要资源。

<table><tbody><tr><td>Sodium Chloride (NaCl)</td><td>Fisher Scientific</td><td>S271-3</td><td>Use at 140 mM in TD Buffer</td></tr><tr><td>Potassium Chloride (KCl)</td><td>Fisher Scientific</td><td>P217-500</td><td>Use at 5 mM in TD Buffer</td></tr><tr><td>Sodium Phosphate (Na&lt;sub&gt;2&lt;/sub&gt;HPO&lt;sub&gt;4&lt;/sub&gt;)</td><td>Sigma</td><td>S0876</td><td>Use at 0.7 mM in TD Buffer</td></tr><tr><td>D-glucose (Dextrose)</td><td>Fisher Scientific</td><td>D16-500</td><td>Use at 0.5 mM in TD Buffer</td></tr><tr><td>Tris Base</td><td>Fisher Scientific</td><td>BP152-1</td><td>Use at 8.25 mM in TD Buffer</td></tr><tr><td>Hydrochloric acid</td><td>Fisher Scientific</td><td>A144-500</td><td>Use to pH TD buffer to 7.4</td></tr><tr><td>Media 199</td><td>GIBCO</td><td>11150-059</td><td></td></tr><tr><td>L-glutamine</td><td>Corning/CellGro</td><td>25-005-CI</td><td>Use at 1% in Media199</td></tr><tr><td>Penicillin/streptomycin</td><td>Corning/CellGro</td><td>30-002-CI</td><td>Use at 1% in Media199</td></tr><tr><td>100 mm petri dishes</td><td>Fisher Scientific</td><td>FB0875711Z</td><td></td></tr><tr><td>Stericup Filter Unit</td><td>Millipore</td><td>SCGPU01RE</td><td>Use to filter sterilize Media</td></tr><tr><td>Dumont #5 forceps (need 2)</td><td>Fine Science Tools</td><td>11251-20</td><td></td></tr><tr><td>35 mm Cell Culture Dish</td><td>Corning</td><td>430165</td><td></td></tr><tr><td>27 G 1 ml SlipTip with precision glide needle</td><td>BD</td><td>309623</td><td></td></tr><tr><td>Fine Scissors</td><td>Fine Science Tools</td><td>14058-11</td><td></td></tr><tr><td>Standard Forceps</td><td>Fine Science Tools</td><td>91100-12</td><td></td></tr><tr><td>Other Items Needed: General dissection instruments,&amp;nbsp; fertile white leghorn chicken eggs, check egg incubator (humidified, 37.7&amp;deg;C), laminar flow hood, binocular stereovision dissecting microscope</td><td></td><td></td><td></td></tr></tbody></table>

establishment of a clinically relevant ex vivo mock cataract surgery model for investigating epithelial wound repair in a native microenvironment

The major impediment to understanding how an epithelial tissue executes wound repair is the limited availability of models in which it is possible to follow and manipulate the wound response ex vivo in an environment that closely mimics that of epithelial tissue injury in vivo. This issue was addressed by creating a clinically relevant epithelial ex vivo injury-repair model based on cataract surgery. In this culture model, the response of the lens epithelium to wounding can be followed live in the cells&#8217; native microenvironment, and the molecular mediators of wound repair easily manipulated during the repair process. To prepare the cultures, lenses are removed from the eye and a small incision is made in the anterior of the lens from which the inner mass of lens fiber cells is removed. This procedure creates a circular wound on the posterior lens capsule, the thick basement membrane that surrounds the lens. This wound area where the fiber cells were attached is located just adjacent to a continuous monolayer of lens epithelial cells that remains linked to the lens capsule during the surgical procedure. The wounded epithelium, the cell type from which fiber cells are derived during development, responds to the injury of fiber cell removal by moving collectively across the wound area, led by a population of vimentin-rich repair cells whose mesenchymal progenitors are endogenous to the lens1. These properties are typical of a normal epithelial wound healing response. In this model, as in vivo, wound repair is dependent on signals supplied by the endogenous environment that is uniquely maintained in this ex vivo culture system, providing an ideal opportunity for discovery of the mechanisms that regulate repair of an epithelium following wounding.

离体模型创建研究伤口愈合过程中的细胞的天然微环境调查涉及细胞的微环境原生内调节上皮伤口愈合机制，创建了一个临床相关的体外模拟白内障手术模式。这个模型是从晶状体组织提供了许多优点，由于其内在特性创建:1）透镜是一个自包含的器官由粗基底膜称为晶状体囊包围; 2）它是无血管，3）没有神经支配和4）免费相关基质。因此，检查了修复过程仅?...

Watch this Scientific Journal Video about Establishment of a Clinically Relevant Ex Vivo Mock Cataract Surgery Model for Investigating Epithelial Wound Repair in a Native Microenvironment at JoVE.com

Establishment of a Clinically Relevant Ex Vivo Mock Cataract Surgery Model for Investigating Epithelial Wound Repair in a Native Microenvironment

Described here is the establishment of a clinically relevant ex vivo mock cataract surgery model that can be used to investigate mechanisms of the injury response of epithelial tissues within their native microenvironment.

建立临床相关<em&gt;离体</em&gt;调查上皮创伤修复的微环境本地人模拟白内障手术模型

The major impediment to understanding how an epithelial tissue executes wound repair is the limited availability of models in which it is possible to ...

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Universidad de Cartagena UDEC

Research

JoVE Journal

Developmental Biology

Establishment of a Clinically Relevant Ex Vivo Mock Cataract Surgery Model for Investigating Epithelial Wound Repair in a Native Microenvironment

6.5K 次观看.  Thomas Jefferson University. Described here is the establishment of a clinically relevant ex vivo mock cataract surgery model that can be used to investigate mechanisms of the injury response of epithelial tissues within their native microenvironment. 

视频: Establishment of a Clinically Relevant Ex Vivo Mock Cataract Surgery Model for Investigating Epithelial Wound Repair in a Native Microenvironment

Human Ex vivo Wound Model and Whole-Mount Staining Approach to Accurately Evaluate Skin Repair

Chronic non-healing wounds, which primarily affect the elderly and diabetic, are a significant area of clinical unmet need. Unfortunately, current chronic wound treatments are inadequate, while available pre-clinical models poorly predict the clinical efficacy of new therapies. Here we describe a high throughput, pre-clinical model to assess multiple aspects of the human skin repair response. Partial thickness wounds were created in human ex vivo skin and cultured across a healing time course. Skin wound biopsies were collected in fixative for the whole-mount staining procedure. Fixed samples were blocked and incubated in primary antibody, with detection achieved via fluorescently conjugated secondary antibody. Wounds were counterstained and imaged via confocal microscopy before calculating percentage wound closure (re-epithelialization) in each biopsy. Applying this protocol, we reveal that 2 mm excisional wounds created in healthy donor skin are fully re-epithelialized by day 4-5 post-wounding. On the contrary, closure rates of diabetic skin wounds are significantly reduced, accompanied by perturbed barrier reformation. Combining human skin wounding with a novel whole-mount staining approach allows a rapid and reproducible method to quantify ex vivo wound repair. Collectively, this protocol provides a valuable human platform to evaluate the effectiveness of potential wound therapies, transforming pre-clinical testing and validation.

Here we demonstrate an optimized technique for assessing wound repair using ex vivo human skin combined with a whole-mount staining approach. This methodology provides a pre-clinical platform for the evaluation of potential wound therapies.

人体外伤模型和全山染色方法，以准确评估皮肤修复

Chronic non-healing wounds, which primarily affect the elderly and diabetic, are a significant area of clinical unmet need. Unfortunately, current chronic ...

科研

发育生物学

Investigating Scarless Tissue Regeneration in Embryonic Wounded Chick Corneas

Chick embryonic corneal wounds display a remarkable capacity to fully and rapidly regenerate, whereas adult wounded corneas experience a loss of transparency due to fibrotic scarring. The tissue integrity of injured embryonic corneas is intrinsically restored with no detectable scar formation. Given its accessibility and ease of manipulation, the chick embryo is an ideal model for studying scarless corneal wound repair. This protocol demonstrates the different steps involved in wounding the cornea of an embryonic chick in ovo. First, eggs are windowed at early embryonic ages to access the eye. Second, a series of in ovo physical manipulations to the extraembryonic membranes are conducted to ensure access to the eye is maintained through later stages of development, corresponding to when the three cellular layers of the cornea are formed. Third, linear cornea wounds that penetrate the outer epithelial layer and the anterior stroma are made using a microsurgical knife. The regeneration process or fully restored corneas can be analyzed for regenerative potential using various cellular and molecular techniques following the wounding procedure. Studies to date using this model have revealed that wounded embryonic corneas display activation of keratocyte differentiation, undergo coordinated remodeling of ECM proteins to their native three-dimensional macrostructure, and become adequately re-innervated by corneal sensory nerves. In the future, the potential impact of endogenous or exogenous factors on the regenerative process could be analyzed in healing corneas by using developmental biology techniques, such as tissue grafting, electroporation, retroviral infection, or bead implantation. The current strategy identifies the embryonic chick as a crucial experimental paradigm for elucidating the molecular and cellular factors coordinating scarless corneal wound healing.

The present protocol demonstrates the different steps involved in wounding the cornea of an embryonic chick in ovo. The regenerating or fully restored corneas can be analyzed for regenerative potential using various cellular and molecular techniques following the wounding procedure.&#160;

研究胚胎损伤雏鸡角膜的无疤痕组织再生

Chick embryonic corneal wounds display a remarkable capacity to fully and rapidly regenerate, whereas adult wounded corneas experience a loss of ...

Corneal Epithelial Abrasion with Ocular Burr As a Model for Cornea Wound Healing

The murine cornea provides an excellent model to study wound healing. The cornea is the outermost layer of the eye, and thus is the first defense to injury. In fact, the most common type of eye injury found in clinic is a corneal abrasion. Here, we utilize an ocular burr to induce an abrasion resulting in removal of the corneal epithelium in vivo on anesthetized mice. This method allows for targeted and reproducible epithelial disruption, leaving other areas intact. In addition, we describe the visualization of the abraded epithelium with fluorescein staining and provide concrete advice on how to visualize the abraded cornea. Then, we follow the timeline of wound healing 0, 18, and 72 h after abrasion, until the wound is re-epithelialized. The epithelial abrasion model of corneal injury is ideal for studies on epithelial cell proliferation, migration and re-epithelialization of the corneal layers. However, this method is not optimal to study stromal activation during wound healing, because the ocular burr does not penetrate to the stromal cell layers. This method is also suitable for clinical applications, for example, pre-clinical test of drug effectiveness.

This protocol describes a method to inflict an abrasion to the ocular surface of the mouse, and to follow the wound healing process thereafter. The protocol takes advantage of an ocular burr to partially remove the surface epithelium of the eye in anaesthetized mice.

眼毛刺角膜上皮磨损与角膜创面愈合的模型研究

The murine cornea provides an excellent model to study wound healing. The cornea is the outermost layer of the eye, and thus is the first defense to ...

医学

Ex Vivo Corneal Organ Culture Model for Wound Healing Studies

The cornea has been used extensively as a model system to study wound healing. The ability to generate and utilize primary mammalian cells in two dimensional (2D) and three dimensional (3D) culture has generated a wealth of information not only about corneal biology but also about wound healing, myofibroblast biology, and scarring in general. The goal of the protocol is an assay system for quantifying myofibroblast development, which characterizes scarring. We demonstrate a corneal organ culture ex vivo model using pig eyes. In this anterior keratectomy wound, corneas still in the globe are wounded with a circular blade called a trephine. A plug of approximately 1/3 of the anterior cornea is removed including the epithelium, the basement membrane, and the anterior part of the stroma. After wounding, corneas are cut from the globe, mounted on a collagen/agar base, and cultured for two weeks in supplemented-serum free medium with stabilized vitamin C to augment cell proliferation and extracellular matrix secretion by resident fibroblasts. Activation of myofibroblasts in the anterior stroma is evident in the healed cornea. This model can be used to assay wound closure, the development of myofibroblasts and fibrotic markers, and for toxicology studies. In addition, the effects of small molecule inhibitors as well as lipid-mediated siRNA transfection for gene knockdown can be tested in this system.

A protocol for an ex vivo corneal organ culture model useful for wound healing studies is described. This model system can be used to assess the effects of agents to promote regenerative healing or drug toxicity in an organized 3D multicellular environment.

创面愈合研究的前活体角膜器官培养模型

The cornea has been used extensively as a model system to study wound healing. The ability to generate and utilize primary mammalian cells in two ...

Development of a Noninvasive, Laser-Assisted Experimental Model of Corneal Endothelial Cell Loss

Nd:YAG lasers have been used to perform noninvasive intraocular surgery, such as capsulotomy for several decades now. The incisive effect relies on the optical breakdown at the laser focus. Acoustic shock waves and cavitation bubbles are generated, causing tissue rupture. Bubble sizes and pressure amplitudes vary with pulse energy and position of the focal point. In this study, enucleated porcine eyes were positioned in front of a commercially available Nd:YAG laser. Variable pulse energies as well as different positions of the focal spots posterior to the cornea were tested. Resulting lesions were evaluated by two-photon microscopy and histology to determine the best parameters for an exclusive detachment of corneal endothelial cells (CEC) with minimum collateral damage. The advantages of this method are the precise ablation of CEC, reduced collateral damage, and above all, the non-contact treatment.

Here, we present a protocol to detach corneal endothelial cells (CEC) from Descemet&#8217;s membrane (DM) using a neodymium:YAG (Nd:YAG) laser as an ex vivo disease model for bullous keratopathy (BK).

角膜内皮细胞损失非侵入性激光辅助实验模型的发展

Nd:YAG lasers have been used to perform noninvasive intraocular surgery, such as capsulotomy for several decades now. The incisive effect relies on the ...

An Epithelial Abrasion Model for Studying Corneal Wound Healing

The cornea is critical for vision, accounting for about two-thirds of the refractive power of the eye. Crucial to the role of the cornea in vision is its transparency. However, due to its external position, the cornea is highly susceptible to a wide variety of injuries that can lead to the loss of corneal transparency and eventual blindness. Efficient corneal wound healing in response to these injuries is pivotal for maintaining corneal homeostasis and preservation of corneal transparency and refractive capabilities. In events of compromised corneal wound healing, the cornea becomes vulnerable to infections, ulcerations, and scarring. Given the fundamental importance of corneal wound healing to the preservation of corneal transparency and vision, a better understanding of the normal corneal wound healing process is a prerequisite to understanding impaired corneal wound healing associated with infection and disease. Toward this goal, murine models of corneal wounding have proven useful in furthering our understanding of the corneal wound healing mechanisms operating under normal physiological conditions. Here, a protocol for creating a central corneal epithelial abrasion in mouse using a trephine and a blunt golf club spud is described. In this model, a 2 mm diameter circular trephine, centered over the cornea, is used to demarcate the wound area. The golf club spud is used with care to debride the epithelium and create a circular wound without damaging the corneal epithelial basement membrane. The resulting inflammatory response proceeds as a well-characterized cascade of cellular and molecular events that are critical for efficient wound healing. This simple corneal wound healing model is highly reproducible and well-published and is now being used to evaluate compromised corneal wound healing in the context of disease.

Here, a protocol for creating a central corneal epithelial abrasion wound in the mouse using a trephine and a blunt golf club spud is described. This corneal wound healing model is highly reproducible and is now being used to evaluate compromised corneal wound healing in the context of diseases.

研究角膜伤口愈合的上皮擦伤模型

The cornea is critical for vision, accounting for about two-thirds of the refractive power of the eye. Crucial to the role of the cornea in vision is its ...

Ex Vivo and In Vivo Animal Models for Mechanical and Chemical Injuries of Corneal Epithelium

Corneal injury to the ocular surface, including chemical burn and trauma, may cause severe scarring, symblepharon, corneal limbal stem cells deficiency, and result in a large, persistent corneal epithelial defect. Epithelial defect with the following corneal opacity and peripheral neovascularization result in irreversible visual impairment and hinder future management, especially keratoplasty. Since the animal model can be used as an effective drug development platform, models of corneal injury to the mouse and alkali burn to rabbit corneal epithelium are developed here. New Zealand white rabbit is used in the alkali burn model. Different concentrations of sodium hydroxide can be applied onto the central circular area of the cornea for 30 s under intramuscular and topical anesthesia. After copious isotonic normal saline irrigation, residual loose corneal epithelium was removed with corneal burr deep down to the Bowman's layer within this circular area. Wound healing was documented by fluorescein staining under Cobalt blue light. C57BL/6 mice were used in the traumatic model of murine corneal epithelium. The murine central cornea was marked using a skin punch, 2 mm in diameter, and then debrided by a corneal rust ring remover with a 0.5 mm burr under a stereomicroscope. These models can be prospectively used to validate the therapeutic effect of eye drops or mixed agents such as stem cells, which potentially facilitate corneal epithelial regeneration. By observing corneal opacity, peripheral neovascularization, and conjunctival congestion with stereomicroscope and imaging software, therapeutic effects in these animal models can be monitored.

Ex Vivo and In Vivo Animal Models for Mechanical and Chemical Injuries of Corneal Epithelium

Here, animal models based on mouse and rabbit are developed for mechanical and chemical injury of corneal epithelium to screen new therapeutics and the underlying mechanism.

角膜上皮机械和化学损伤的离体和体内动物模型

Corneal injury to the ocular surface, including chemical burn and trauma, may cause severe scarring, symblepharon, corneal limbal stem cells deficiency, ...

Production of Modified Autologous Conditioned Serum and Ex Vivo Assessment of Its Healing Potential in Murine Corneal Epithelium

Human blood-derived topical therapies have been a boon to clinicians in recent decades. Autologous serum (AS) and platelet-rich plasma (PRP) are enriched in epitheliotropic growth factors that are essential in corneal wound healing. Unlike AS, PRP is based on a differential centrifugation system, yielding more platelet-derived growth factors. Autologous conditioned serum (ACS) not only preserves the preparation of AS and PRP, but also focuses on immune-modulating properties, which are important in inflammatory diseases.
The lack of standardized protocols and high preparation costs are limitations for the clinical application of ACS. This video experiment demonstrates a standard operating procedure for preparing modified autologous conditioned serum (mACS) eye drops. First, glycerol was added into heparin syringes as the blood cell stabilizer during hypoxic incubation. To activate the blood cells, a 4 h incubation at 37 &#176;C was initiated. Then, the blood samples were centrifuged at 3,500 &#215; g for 10 min at room temperature. After filtration of the supernatant through a 0.22 &#181;m filter, the mACS eye drops were fully prepared.
A tentative try-out of the therapeutic effect of mACS showed that it may have competitive advantages over conventional AS in the corneal wound healing in ex vivo mouse eyes. The AS used in this study was prepared according to published studies and the clinical practice in our hospital. Therefore, the efficacy of mACS on ocular surface diseases could be evaluated in future research through in vivo animal studies and clinical trials.

Production of Modified Autologous Conditioned Serum and Ex Vivo Assessment of Its Healing Potential in Murine Corneal Epithelium

This article describes a protocol to simplify the process and render the preparation of autologous conditioned serum (ACS) less expensive. No special syringes or surface-coated glass beads are needed. Moreover, the modified ACS (mACS) has competitive advantages over conventional autologous serum in the corneal wound healing of murine eyes ex vivo.

改良自体条件血清的生产及其在小鼠角膜上皮中愈合潜力的离 体 评估

Human blood-derived topical therapies have been a boon to clinicians in recent decades. Autologous serum (AS) and platelet-rich plasma (PRP) are enriched ...

Establishing a Severe Corneal Inflammation Model in Rats Based on Corneal Epithelium Curettage Combined with Corneal Sutures

Corneal inflammation, especially severe corneal inflammation, plays a significant role in the development of corneal limbal stem cell dysfunction. Constructing appropriate animal models can help us focus on the effects of severe inflammation on corneal limbal stem cells. A 2 mm rust remover&#160;was&#160;used to remove the central corneal epithelium of Sprague Dawley (SD) rats to create an injury. Then, the central stroma of the cornea was sutured with nylon sutures to induce persistent inflammation. In this way, a corneal inflammation model with central corneal epithelium abrasion and central stroma suturing was constructed, which induced severe corneal inflammation. The changes in corneal inflammation and the condition of the limbal stem cells at 1, 3, and 7 days post-modeling were observed. On the 3rd day after modeling, the rats&#39; corneal limbus was severely edematous, with obvious neovascularization and local hyperplasia, which are typical signs of limbal stem cell deficiency. By the 7th day, the corneal edema gradually worsened, and the neovascularization continued to increase. Through quantitative reverse transcription polymerase chain reaction (RT-qPCR) and immunofluorescence staining, we found that the corneal epithelial inflammatory factors were significantly upregulated, the corneal epithelial differentiation was abnormal, the corneal epithelial stem cells were significantly reduced, and the cell proliferation and stemness had also decreased. Therefore, this model demonstrates that severe inflammation can induce limbal stem cell damage without directly damaging the limbal stem cells. The model is beneficial for observing the effects of severe inflammation on the biological mechanisms of stem cells and provides an ideal platform for studying the mechanisms of corneal epithelial stem cell dysfunction induced by inflammation.

We developed a rat model of severe corneal inflammation through corneal epithelium curettage combined with corneal sutures. The study evaluated corneal inflammation patterns, epithelial proliferation, and changes in limbal stem cells under inflammatory conditions.

Corneal inflammation, especially severe corneal inflammation, plays a significant role in the development of corneal limbal stem cell dysfunction. ...

Characterizing Epithelial Wound Healing In Vivo Using the Cnidarian Model Organism Clytia hemisphaerica

All animal organs, from the skin to eyes to intestines, are covered with sheets of epithelial cells that allow them to maintain homeostasis while protecting them from infection. Therefore, it is not surprising that the ability to repair epithelial wounds is critical to all metazoans. Epithelial wound healing in vertebrates involves overlapping processes, including inflammatory responses, vascularization, and re-epithelialization. Regulation of these processes involves complex interactions between epithelial cells, neighboring cells, and the extracellular matrix (ECM); the ECM contains structural proteins, regulatory proteins, and active small molecules. This complexity, together with the fact that most animals have opaque tissues and inaccessible ECMs, makes wound healing difficult to study in live animals. Much work on epithelial wound healing is therefore performed in tissue culture systems, with a single epithelial cell-type plated as a monolayer on an artificial matrix. Clytia hemisphaerica (Clytia) provides a unique and exciting complement to these studies, allowing epithelial wound healing to be studied in an intact animal with an authentic ECM. The ectodermal epithelium of Clytia is a single layer of large squamous epithelial cells, allowing high-resolution imaging using differential interfering contrast (DIC) microscopy in living animals. The absence of migratory fibroblasts, vasculature, or inflammatory responses makes it possible to dissect the critical events in re-epithelialization in vivo. The healing of various types of wounds can be analyzed, including single-cell microwounds, small and large epithelial wounds, and wounds that damage the basement membrane. Lamellipodia formation, purse string contraction, cell stretching, and collective cell migration can all be observed in this system. Furthermore, pharmacological agents can be introduced via the ECM to modify cell:ECM interactions and cellular processes in vivo. This work shows methods for creating wounds in live Clytia, capturing movies of healing, and probing healing mechanisms by microinjecting reagents into the ECM.

Characterizing Epithelial Wound Healing In Vivo Using the Cnidarian Model Organism Clytia hemisphaerica

This paper describes a method to create wounds in the epithelium of a live Clytia hemisphaerica medusa and image wound healing at a high resolution in vivo. Additionally, a technique to introduce dyes and drugs to perturb signaling processes in the epithelial cells and extracellular matrix during wound healing is presented.

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人体外伤模型和全山染色方法，以准确评估皮肤修复

研究胚胎损伤雏鸡角膜的无疤痕组织再生

眼毛刺角膜上皮磨损与角膜创面愈合的模型研究

创面愈合研究的前活体角膜器官培养模型

角膜内皮细胞损失非侵入性激光辅助实验模型的发展

研究角膜伤口愈合的上皮擦伤模型

角膜上皮机械和化学损伤的离体和体内动物模型

改良自体条件血清的生产及其在小鼠角膜上皮中愈合潜力的离体评估

Establishing a Severe Corneal Inflammation Model in Rats Based on Corneal Epithelium Curettage Combined with Corneal Sutures

使用刺胞动物模式生物Clytia hemisphaerica表征体内上皮伤口愈合

建立临床相关

摘要

探索更多视频

此视频中的章节

人体外伤模型和全山染色方法，以准确评估皮肤修复

研究胚胎损伤雏鸡角膜的无疤痕组织再生

眼毛刺角膜上皮磨损与角膜创面愈合的模型研究

创面愈合研究的前活体角膜器官培养模型

角膜内皮细胞损失非侵入性激光辅助实验模型的发展

研究角膜伤口愈合的上皮擦伤模型

角膜上皮机械和化学损伤的离体和体内动物模型

改良自体条件血清的生产及其在小鼠角膜上皮中愈合潜力的离 体 评估

Establishing a Severe Corneal Inflammation Model in Rats Based on Corneal Epithelium Curettage Combined with Corneal Sutures

使用刺胞动物模式生物Clytia hemisphaerica表征体内上皮伤口愈合

改良自体条件血清的生产及其在小鼠角膜上皮中愈合潜力的离体评估