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Engineering Injectable Microporous Hydrogels for Diabetic Wound Repair

用于糖尿病伤口修复的工程可注射微孔水凝胶

基本信息

批准号：
10297936
负责人：
Donald Richieri Griffin
金额：
$ 64.44万
依托单位：
UNIVERSITY OF VIRGINIA
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：
2021-08-02 至 2026-06-30
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10297936
关键词：
Address Affinity Amino Acid Substitution Animal Model Behavior Biocompatible Materials Blood Vessels Brain Caliber Cell Line Cells Chemicals Clinical Complication Crosslinker Defect Dermal Diabetic Foot Ulcer Diabetic mouse Engineering Ensure Environment Enzymes Exhibits Family suidae Foreign-Body Reaction Formulation Gel Generations Geometry Goals Hair follicle structure Heparin Heterogeneity Histology Hydrogels Immune response Immunofluorescence Immunologic In Situ In Vitro Individual Inflammation Inflammatory Injectable Instruction Intestines Investigation Island Lower Extremity Mechanics Mediating Microfluidics Microscopic Microspheres Muscle Natural regeneration Outcome Pathologic Patients Peptides Perfusion Pilot Projects Porosity Property Proteolysis Resistance Skin Skin wound healing Splint Device Structure Testing Thick Tissues Ulcer Vascularization Wound models angiogenesis articular cartilage base cell behavior cell motility chemokine design diabetic ulcer diabetic wound healing healing immune activation immunogenicity immunoregulation improved in vivo macrophage migration non-diabetic novel particle post stroke premature ratiometric regenerative response scaffold secondary outcome standard of care tissue regeneration wound wound closure wound environment wound healing wound treatment

项目摘要

PROJECT SUMMARY In this proposal, we aim to engineer a biomaterial scaffold to accelerate diabetic wound closure by improving upon a new sub-class of hydrogel biomaterials we have invented called Microporous Annealed Particle gel or MAP gel. MAP gels are composed of microscopic spherical building blocks made using microfluidic generation and assembled in situ to form a stable MAP scaffold. MAP scaffolds have been shown to improve tissue healing in both skin and brain through a porosity-dependent reduction in wound inflammation and promotion of cell/tissue integration. We are focusing on material improvements to counter three known difficulties for material-based treatment of diabetic wounds: abnormally high immune activation, increased degradative microenvironment, and diminished new tissue generation. Specifically, we have identified three MAP properties that we can independently modulate for scientific optimization: pore geometry (known immunomodulatory parameter), degradability (premature material degradation results in loss of porous geometry), and heterogeneous heparin “micro-islands” (a novel material strategy we have developed to improve intra- scaffold angiogenesis). We hypothesize that investigating and optimizing each property individually will accelerate diabetic wound closure and, finally, that the optimized properties can be combined synergistically. We will evaluate and optimize each material property using the following characterization workflow: in vitro property quantification (property-dependent), in vitro cell response (survival, proliferation, and migration), in vivo immune response (analysis by FACS), in vivo material degradation (analysis by histology), and in vivo tissue healing/regeneration (analysis by immunohistology). Our studies focus on the diabetic wound environment through use of dermal cell lines in vitro and a diabetic mouse (db/db) splinted wound healing model. Each Aim of our approach isolates an individual material property to simplify the investigation. For example, pore geometry impact is investigated using a single hydrogel formulation and hydrogel formulation impact uses a single pore geometry (constant formulation and pore geometry taken from our successful non-diabetic studies). If successful, this project will provide a better understanding of tissue response to a new class of biomaterial and produce an inexpensive and effective scaffold treatment option for accelerating diabetic wound closure.

项目总结