title: Functionalized self-assembling peptide nanofiber hydrogels mimic stem cell niche to control human adipose stem cell behavior in vitro.
abstract: A class of designer functionalized self-assembling peptide nanofiber scaffolds developed from self-assembling peptide RADA16-I (AcN-RADARADARADARADA-CONH2) has become increasingly attractive not only for studying spatial behaviors of cells, but also for developing approaches for a wide range of medical applications including regenerative medicine, rapid hemostasis and cell therapy. In this study, we report three functionalized self-assembling peptide hydrogels that serve as a three-dimensional (3-D) artificial microenvironment to control human adipose stem cell (hASC) behavior in vitro. Short peptide motifs SKPPGTSS (bone marrow homing motif), FHRRIKA (heparin-binding motif) and PRGDSGYRGDS (two-unit RGD cell adhesion motif) were used to extend the C-terminus of RADA16-I to obtain functionalized peptides. Atomic force microscopy confirmed the formation of self-assembling nanofibers in the mixture of RADA16-I peptide and functionalized peptides. The behaviors of hASCs cultured in 3-D peptide hydrogels, including migration, proliferation and growth factor-secretion ability, were studied. Our results showed that the functionalized peptide hydrogels were suitable 3-D scaffolds for hASC growth with higher cell proliferation, migration and the secretion of angiogenic growth factors compared with tissue culture plates and pure RADA16-I scaffolds. The present study suggests that these functionalized designer peptide hydrogels not only have promising applications for diverse tissue engineering and regenerative medicine applications as stem cell delivery vehicles, but also could be a biomimetic 3-D system to study nanobiomaterial-stem cell interactions and to direct stem cell behaviors.
authors: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
authors: Xi
authors: X
authors: Liu
authors: Xiumei
authors: X
authors: Wang
authors: Xiujuan
authors: X
authors: Wang
authors: Hui
authors: H
authors: Ren
authors: Jin
authors: J
authors: He
authors: Lin
authors: L
authors: Qiao
authors: Fu-Zhai
authors: FZ
authors: Cui
mesh_terms: D017667:Adipocytes / Q000166:cytology* / Q000502:physiology; D001672:Biocompatible Materials / Q000138:chemical synthesis; D040761:Biomimetic Materials / Q000138:chemical synthesis*; D002454:Cell Differentiation; D002465:Cell Movement / Q000502:physiology; D049109:Cell Proliferation; D002470:Cell Survival / Q000502:physiology; D002478:Cells, Cultured; D003460:Crystallization / Q000379:methods; D006801:Humans; D020100:Hydrogels / Q000737:chemistry; D008422:Materials Testing; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D010455:Peptides / Q000737:chemistry*; D055153:Stem Cell Niche / Q000502:physiology*; D013234:Stem Cells / Q000166:cytology* / Q000502:physiology; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D001672:Biocompatible Materials; D020100:Hydrogels; D010455:Peptides; C546681:RADA16-I