基于胶原蛋白的支架用于组织再生时,联合持续释放和触发释放以实现顺序性病毒转导。

Combined sustained and triggered release for sequential viral-transduction from collagen-based scaffolds for tissue regeneration.

作者信息

Amante John J, Twombly Bridget, Thotathil Naaz, Kearney Cathal J

机构信息

Biomedical Engineering Department, University of Massachusetts, Amherst, Massachusetts, USA.

出版信息

Biomater Sci. 2025 Aug 5;13(16):4437-4446. doi: 10.1039/d5bm00623f.

Abstract

Chronic wounds are a major healthcare issue that are recalcitrant to many traditional treatments. Increasingly, tissue engineering scaffolds are being developed and translated to promote their healing. To control signaling in the wound environment, gene therapy approaches are being explored, with adeno-associated virus (AAV) becoming increasingly popular. One critical challenge in chronic wound healing is that the wounds do not progress through the typical wound healing cascade, with signaling getting stuck in the inflammatory/immature tissue formation phase. This motivated us to develop a system capable of triggered sequential release of viral vectors to drive coordinated signaling. By housing this system within a collagen-glycosaminoglycan (GAG) scaffold, we aim to provide a proven extracellular matrix template as well as the correct signaling profile for closure of chronic wounds. Our system consists of two alginate pockets within the collagen-GAG scaffold, which we use to control the release of AAV. The first pocket allows diffusion of one AAV therapeutic and the second pocket can be ultrasound-triggered using low-frequency stimulation to release the second therapeutic. Initially, we developed and characterized the system using a reporter AAV. At our high AAV loading, we got sustained release and GFP expression over 9 days from our system , but lower loading had minimal transduction. When this lower group was triggered with ultrasound, cells were successfully transduced. Finally, we demonstrated sequential release of AAV encoding clinically-relevant genes for angiogenesis. This system has the potential for broad applicability as it can be readily adapted to mimic a range of biological pathways.

摘要

慢性伤口是一个重大的医疗保健问题,许多传统治疗方法对其效果不佳。越来越多的组织工程支架正在被研发并转化应用以促进伤口愈合。为了控制伤口环境中的信号传导,人们正在探索基因治疗方法,腺相关病毒(AAV)越来越受欢迎。慢性伤口愈合中的一个关键挑战是伤口无法通过典型的伤口愈合级联反应,信号传导被困在炎症/未成熟组织形成阶段。这促使我们开发一种能够触发病毒载体顺序释放以驱动协调信号传导的系统。通过将该系统置于胶原蛋白 - 糖胺聚糖(GAG)支架内,我们旨在提供一个经过验证的细胞外基质模板以及促进慢性伤口闭合的正确信号特征。我们的系统由胶原蛋白 - GAG支架内的两个藻酸盐囊袋组成,我们用它们来控制AAV的释放。第一个囊袋允许一种AAV治疗剂扩散,第二个囊袋可以通过低频超声刺激触发释放第二种治疗剂。最初,我们使用报告基因AAV开发并表征了该系统。在高AAV负载量下,我们的系统在9天内实现了持续释放和绿色荧光蛋白(GFP)表达,但较低负载量时转导作用最小。当对这个低负载组进行超声触发时,细胞成功实现了转导。最后,我们展示了编码与血管生成相关临床基因的AAV的顺序释放。该系统具有广泛的应用潜力,因为它可以很容易地进行调整以模拟一系列生物途径。

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