| Bioorthogonal Labeling and Chemoselective Functionalization of Lung Extracellular Matrix
|
|
Author:
Date:
2021-02-20
[Abstract] Decellularized extracellular matrix (ECM) biomaterials derived from native tissues and organs are widely used for tissue engineering and wound repair. To boost their regenerative potential, ECM biomaterials can be functionalized via the immobilization of bioactive molecules. To enable ECM functionalization in a chemoselective manner, we have recently reported an effective approach for labeling native organ ECM with the click chemistry-reactive azide ligand via physiologic post-translational glycosylation. Here, using the rat lung as a model, we provide a detailed protocol for in vivo and ex vivo metabolic azide labeling of the native organ ECM using N-Azidoacetylgalactosamine-tetraacylated (Ac4GalNAz), together with procedures for decellularization and labeling characterization. Our ...
[摘要] [摘要]源自天然组织和器官的脱细胞细胞外基质(ECM)生物材料被广泛用于组织工程和伤口修复。为了增强其再生潜力,可以通过固定生物活性分子来使ECM生物材料功能化。为了使ECM以化学选择性的方式实现功能化,我们最近报告了一种有效的方法,可通过生理学上的翻译后糖基化,用点击化学反应的叠氮化物配体标记天然器官ECM 。在此,使用大鼠肺为模型,我们提供一种用于详细方案在体内和离体代谢叠氮化物使用N- Azidoacetylgalactosamine-tetraacylated天然器官ECM的标记(AC 4GalNAz),以及用于脱细胞和标记表征的程序。我们的方法可以在体内三天内或离体器官培养期间的一天之内进行特异性而稳定的ECM标记。脱细胞后,所得的ECM标记保持稳定。通过我们的方法,ECM生物材料可以用所需的炔烃修饰的生物分子(例如生长因子和糖胺聚糖)进行功能化,以用于组织工程和再生应用。
关键字:细胞外基质,脱细胞,生物正交,化学选择性功能化,点击化学,肺
[背景]细胞外基质(ECM)是由特定组织或器官的非细胞成分组成的水合网络支架,在通过其所包含的生物活性成分(例如纤维蛋白,生长)支持住宅细胞的活动中起关键作用。因子和糖胺聚糖(GAG)(Theocharis et ...
|
|
|
| Modeling NOTCH1 driven T-cell Acute Lymphoblastic Leukemia in Mice
|
|
Author:
Date:
2020-05-20
[Abstract] T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive hematological malignancy that arises from transformation of T-cell primed hematopoietic progenitors. Although T-ALL is a heterogenous and molecularly complex disease, more than 65% of T-ALL patients carry activating mutations in the NOTCH1 gene. The majority of T-ALL–associated NOTCH1 mutations either disrupt the negative regulatory region, allowing signal activation in the absence of ligand binding, or result in truncation of the C-terminal PEST domain involved in the termination of NOTCH1 signaling by proteasomal degradation. To date, retroviral transduction models have relied heavily on the overexpression of aggressively truncated variants of NOTCH1 (such as ICN1 or ΔE-NOTCH1), which result in ...
[摘要] [摘要 ] T细胞急性淋巴细胞白血病(T-ALL)是一种侵袭性血液恶性肿瘤,其起源于T细胞引发的造血祖细胞的转化。尽管T-ALL是一种异质且分子复杂的疾病,但超过65%的T-ALL患者在NOTCH1 基因中带有激活突变。大多数与T-ALL相关的NOTCH1 突变要么破坏负调控区,允许在没有配体结合的情况下激活信号,要么导致蛋白酶体降解终止NOTCH1信号终止所涉及的C末端PEST域被截短。迄今为止,逆转录病毒转导模型在很大程度上依赖于侵袭性截短的变种的过度表达。 NOTCH1 (例如ICN1或ΔE-NOTCH1)可导致信号传导的超生理水平,并且在人类T-ALL中很少见。当前方案描述了小鼠骨髓分离,造血干细胞和祖细胞(HSC)富集,然后逆转录病毒转导的致癌突变体形式的NOTCH1受体(NOTCH1-L1601P-ΔP)的方法,该方法与获功能突变最常见于患者样品中。组成型活性NOTCH1的这种强制表达的标志是胸腺外未成熟T细胞发育的瞬时波,此波在致癌性转化为T-ALL之前。此外,该方法通过允许白血病细胞与微环境之间的串扰来模拟体内白血病的转化和进展,这是基于细胞系的体外研究无法解释的一个方面。因此,HSC转导和移植模型更真实地概括了人类疾病的发展,为进一步的体内和离体功能研究提供了高度全面和通用的工具。
[背景 ] ...
|
|
|