Delivery of MSCs with a Hybrid β-Sheet Peptide Hydrogel Consisting IGF-1C Domain and D-Form Peptide for Acute Kidney Injury Therapy

By providing an appropriate microenvironment, synthetic biomaterials have been progressively successful in stem cell-based tissue regeneration by enhancing the engraftment and survival of transplanted cells. The designs with bioactive motifs to influence cell behavior and with D-form amino acid to modulate scaffold stability will be critical for the development and optimization of self-assembling biomimetic hydrogel scaffolds for stem cell therapy. In this study, we linked naphthalene (Nap) covalently conjugated a short D-form peptide (Nap-DFDFG) to C domain of insulin-like growth factor-1 (IGF-1C) as a functional peptide-based scaffold. Our purpose is to provide a functional self-assembling peptide hydrogel with encapsulated human placenta derived mesenchymal stem cells (hP-MSCs) and thereby to enhance the therapeutic efficiency of hP-MSCs in murine acute kidney injury (AKI) model. Our results revealed that a typical β-sheet conformation was confirmed and this self-assembling peptide hydrogel exhibited higher affinity with IGF-1 receptor. Furthermore, this hydrogel could provide a favorable niche for hP-MSCs and thereby ameliorate renal function in an AKI model by promoting cell survival and angiogenesis. In conclusion, by covalently linking the desired functional group to D-form peptide to create a functional hydrogel, this self-assembling β-sheet peptide hydrogel will serve as a promising platform for future tissue-engineering and stem cell therapy.