Engineering microscale hydrogel deposition to direct single stem cell differentiation

工程微型水凝胶沉积指导单干细胞分化

基本信息

批准号：
10181469
负责人：
Jae-Won Shin
金额：
$ 40.02万
依托单位：
UNIVERSITY OF ILLINOIS AT CHICAGO
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-04-01 至 2024-12-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10181469
关键词：
3-Dimensional Ablation Address Alginates Animal Model Biocompatible Materials Biological Biological Assay Biophysics Bone Regeneration Cell Therapy Cell Volumes Cells Clinical Clinical Trials Cues Data Deposition Disease Elasticity Encapsulated Engineering Formulation Gel Gene Expression Profiling Genetic Genetic Transcription Growth Heterogeneity Hydrogels Image Individual Injections Integrins Ion Channel Kinetics Ligands Marrow Measures Mechanics Mediating Membrane Membrane Potentials Mesenchymal Stem Cells Microfluidics Natural regeneration Osteogenesis Outcome Pathway Analysis Population Production Property RGD (sequence)Reporting Reproducibility Research Personnel Role Small Interfering RNA Stress Technology Testing Therapeutic Thick Thinness Tissues Validation Vanilloid Work adult stem cell base biophysical model biophysical techniques clinical efficacy clinically relevant design fos-related antigen 1 imaging modality improved in vivo injured insight instrumentation interdisciplinary approach knock-down mathematical model member mouse model multidisciplinary novel osteogenic programs public health relevance receptor regenerative response stem cell differentiation stem cell fate stem cell function stem cell growth stem cells therapy outcome tissue regeneration transcription factor transcriptome viscoelasticity

项目摘要

PROJECT SUMMARY Adult stem cells hold broad-ranging clinical potential to regenerate injured tissues. For instance, mesenchymal stem cells (MSCs) have been investigated in over 950 clinical trials for use in many disease indications. Despite their significant clinical relevance, however, there is currently lack of the mechanistic understanding to precisely control MSC functions for reproducible therapeutic outcomes. Engineered hydrogels have been used to reveal the ability of MSCs to sense and respond to matrix biophysical cues, which subsequently impact the differentiation potential of MSCs. However, leveraging these insights for therapeutic purposes has been challenging, since current approaches to interface a cell population with a hydrogel by uncontrolled mixing overlook the significance of heterogeneity in the local amount of the gel presented to individual cells, leading to variable and unclear cell-material interactions at the single cell level. We describe herein a highly efficient approach to control microscale hydrogel deposition around single cells in a 3D space independently of gel composition and elasticity. Using this approach, our preliminary data show that MSCs rapidly expand in volume when they adhere to an integrin ligand in thinner gels. We show that encapsulating single MSCs in a thin gel coating is sufficient to enhance the osteogenic potential of MSCs even when gel elasticity is low. We will build upon these results to test the hypothesis that controlling local gel deposition around single MSCs impacts membrane tension and lineage specification by regulating cell volume expansion. In Aim 1, we will determine the effect of varying local gel deposition on regulatory volume decrease by modulating mechanosensitive ion channels and its impact on membrane tension of MSCs. In Aim 2, we will determine how varied local gel deposition impacts single MSC fate and MSC-based bone regeneration. We predict that there exists a transcriptional program that is selectively activated when the gel deposition becomes thinner, thereby impacting lineage specification of MSCs independently of gel elasticity. The project is highly multidisciplinary in that it will employ a combination of expertise in biomaterials, biophysical, genetic, and in vivo approaches to address the specific aims. The results will help to define local gel deposition as an important determinant of stem cell growth, thereby impacting stem cell mechanics and fate. Given the clinical relevance of these cells, our results will inform formulation design of MSC-based therapeutics for improved regenerative outcomes.

项目概要成体干细胞具有广泛的临床潜力，可以再生受损组织。例如，间充质干细胞 (MSC) 已在超过 950 项临床试验中进行了研究，可用于多种疾病适应症。然而，尽管它们具有重要的临床意义，但目前仍缺乏对其机制的理解。精确控制 MSC 功能以获得可重复的治疗结果。工程水凝胶已被使用揭示 MSC 感知和响应基质生物物理线索的能力，从而影响 MSCs的分化潜能。然而，利用这些见解来达到治疗目的已经具有挑战性，因为目前通过不受控制的混合将细胞群与水凝胶连接的方法忽视了呈现给单个细胞的凝胶局部量的异质性的重要性，导致单细胞水平上可变且不清楚的细胞-材料相互作用。我们在此描述了一种高效独立于凝胶控制 3D 空间中单细胞周围微型水凝胶沉积的方法成分和弹性。使用这种方法，我们的初步数据表明 MSC 的体积迅速扩大当它们粘附在较薄的凝胶中的整合素配体上时。我们证明将单个 MSC 封装在薄凝胶中即使凝胶弹性较低，涂层也足以增强 MSC 的成骨潜力。我们将建设根据这些结果来检验控制单个 MSC 周围局部凝胶沉积影响的假设通过调节细胞体积膨胀来实现膜张力和谱系规范。在目标 1 中，我们将确定通过调节机械敏感离子，改变局部凝胶沉积对调节体积减小的影响通道及其对 MSC 膜张力的影响。在目标 2 中，我们将确定局部凝胶的变化程度沉积影响单个 MSC 的命运和基于 MSC 的骨再生。我们预测存在一个当凝胶沉积变薄时选择性激活转录程序，从而影响 MSC 的谱系规格，与凝胶弹性无关。该项目是高度跨学科的它将结合生物材料、生物物理、遗传和体内方法的专业知识解决具体目标。结果将有助于将局部凝胶沉积定义为重要的决定因素干细胞生长，从而影响干细胞力学和命运。鉴于这些细胞的临床相关性，我们的结果将为基于 MSC 的疗法的配方设计提供信息，以改善再生结果。