| Multilayered Fabrication Assembly Technique to Engineer a Corneal Stromal Equivalent
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Author:
Date:
2021-03-20
[Abstract] Tissue engineering has emerged as a strategy to combat the donor shortage of human corneas for transplantation. Synthetic corneal substitutes are currently unable to support the normal phenotype of human cells and so decellularized animal corneas have been deployed to more closely provide the topographical and biochemical cues to promote cell attachment and function. Although full thickness decellularized corneas can support corneal cells, the cells are slow to populate the scaffold and density declines from the surface. To avoid these problems, this protocol describes the stacking of alternate layers of decellularized porcine corneal sheets and cell-laden collagen hydrogel to produce a corneal construct. The sheets are obtained by cryosectioning porcine corneas, decellularizing them with ...
[摘要] [摘要]组织工程学已成为一种解决人类角膜移植供体短缺的策略。合成的角膜替代物目前不能支持人类细胞的正常表型,因此已经使用脱细胞的动物角膜来更紧密地提供地形和生化线索以促进细胞附着和功能。尽管全厚度的脱细胞角膜可以支持角膜细胞,但这些细胞填充支架的速度很慢,并且密度从表面降低。为了避免这些问题,该协议描述了脱细胞层的交替层的堆叠 猪角膜片和载有细胞的胶原蛋白水凝胶可产生角膜构建体。通过将猪角膜冷冻切片,用去污剂和核酸酶使它们脱细胞,最后进行空气干燥以储存和易于制造,从而获得了薄片。然后将角膜基质细胞封装在I型胶原溶液中,并在这些薄片之间进行浇铸。该协议提出了一种快速的方法,以确保仅使用组织来源的材料即可在整个构建体中获得高细胞度。
图形摘要:
获得角膜基质等效物的主要过程概述
[背景]角膜失明影响着全球数百万人,治疗主要依赖于人类供体角膜的移植(Gain等人,2016)。由于这些捐赠是稀缺的,因此需要基于生物材料的组织工程学的替代方案。正在开发各种各样的策略和材料来工程化角膜组织,一种有前途的方法是使用脱细胞的动物角膜(Fernández- Pérez和Ahearne ...
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| In vitro Cultivation and Visualization of Malaria Liver Stages in Primary Simian Hepatocytes
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Author:
Date:
2020-08-20
[Abstract] Human liver is the primary and obligatory site for malaria infection where sporozoites invade host hepatocytes. Malaria hepatic stages are asymptomatic and represent an attractive target for development of anti-malarial interventions and vaccines. However, owing to lack of robust and reproducible in vitro culture system, it is difficult to target and study this imperative malaria liver stage. Here, we describe a procedure that allow cultivation and visualization of malaria hepatic stages including dormant hypnozoites using primary simian hepatocytes. This method enables sensitive and quantitative assessment of different hepatic stages in vitro.
[摘要] [摘要 ] 人肝是疟疾感染的主要场所,子孢子侵入宿主肝细胞。疟疾的肝分期是无症状的,并且是开发抗疟疾干预措施和疫苗的有吸引力的目标。然而,由于缺乏健壮和可重现的体外培养系统,因此难以靶向和研究这种必不可少的疟疾肝阶段。在这里,我们描述了一种程序,该程序允许使用原代猿猴肝细胞培养和可视化疟疾肝阶段,包括休眠的次生子。这种方法可以对体外不同肝期进行灵敏和定量的评价。
[背景 ] 疟疾是女性的叮咬后传染给人类按蚊蚊子注入子孢子进入血流,其迁移到肝脏和侵入宿主的肝细胞。在肝细胞内部,子孢子进行第一轮无性繁殖并转化为多核肝裂殖体。完全成熟的肝脏裂殖体破裂并释放裂殖子,该裂殖子进入血流并感染红细胞(RBC)。在红细胞内部,寄生虫进行了第二轮无性繁殖,血液阶段的完成最终引起了与疟疾有关的临床症状。例外地,在所有疟原虫物种中,间日疟原虫,食蟹猴和卵圆形疟原虫的子孢子可产生休眠的肝形式,称为次生子孢子(Prudêncioet al。,2011)。
间日疟原虫是第二大主要疟原虫,在包括热带,亚热带和温带气候在内的所有疟疾物种中地理分布更广。消除间日疟原虫疟疾的最大挑战是由休眠的次生子激活引起的周期性疟疾复发,这些休眠的次生子启动了肝阶段增殖的发作(Wells ...
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