Development of peptide-functionalized synthetic hydrogel microarrays for stem cell and tissue engineering applications.
Synthetic polymer microarray technology holds remarkable promise to rapidly identify suitable biomaterials for stem cell and tissue engineering applications. However, most of previous microarrayed synthetic polymers do not possess biological ligands (e.g., peptides) to directly engage cell surface receptors. Here, we report the development of peptide-functionalized hydrogel microarrays based on light-assisted copolymerization of poly(ethylene glycol) diacrylates (PEGDA) and methacrylated-peptides. Using solid-phase peptide/organic synthesis, we developed an efficient route to synthesize methacrylated-peptides. In parallel, we identified PEG hydrogels that effectively inhibit non-specific cell adhesion by using PEGDA-700 (M. W.=700) as a monomer. The combined use of these chemistries enables the development of a powerful platform to prepare peptide-functionalized PEG hydrogel microarrays. Additionally, we identified a linker composed of 4 glycines to ensure sufficient exposure of the peptide moieties from hydrogel surfaces. Further, we used this system to directly compare cell adhesion abilities of several related RGD peptides: RGD, RGDS, RGDSG and RGDSP. Finally, we combined the peptide-functionalized hydrogel technology with bioinformatics to construct a library composed of 12 different RGD peptides, including 6 unexplored RGD peptides, to develop culture substrates for hiPSC-derived cardiomyocytes (hiPSC-CMs), a cell type known for poor adhesion to synthetic substrates. 2 out of 6 unexplored RGD peptides showed substantial activities to support hiPSC-CMs. Among them, PMQKMRGDVFSP from laminin β4 subunit was found to support the highest adhesion and sarcomere formation of hiPSC-CMs. With bioinformatics, the peptide-functionalized hydrogel microarrays accelerate the discovery of novel biological ligands to develop biomaterials for stem cell and tissue engineering applications.



In this manuscript, we described the development of a robust approach to prepare peptide-functionalized synthetic hydrogel microarrays. Combined with bioinformatics, this technology enables us to rapidly identify novel biological ligands for the development of the next generation of functional biomaterials for stem cell and tissue engineering applications.
Bioengineering Department, Clemson University, Clemson, SC 29634, USA.
Jia
J
Jia
Bioengineering Department, Clemson University, Clemson, SC 29634, USA.
Robert C
RC
Coyle
Bioengineering Department, Clemson University, Clemson, SC 29634, USA.
Dylan J
DJ
Richards
Bioengineering Department, Clemson University, Clemson, SC 29634, USA.
Christopher Lloyd
CL
Berry
College of Engineering and Computing, University of South Carolina, Columbia, SC 29208, USA.
Ryan Walker
RW
Barrs
Bioengineering Department, Clemson University, Clemson, SC 29634, USA.
Joshua
J
Biggs
Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA.
C
C
James Chou
Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA.
Thomas C
TC
Trusk
Bioengineering Department, Clemson University, Clemson, SC 29634, USA; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA. Electronic address: mei@clemson.edu.
Ying
Y
Mei
D000818:Animals; D002448:Cell Adhesion / Q000187:drug effects; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000494:pharmacology*; D057026:Induced Pluripotent Stem Cells / Q000166:cytology* / Q000187:drug effects; D032383:Myocytes, Cardiac / Q000166:cytology / Q000187:drug effects; D010455:Peptides / Q000494:pharmacology*; D011092:Polyethylene Glycols / Q000737:chemistry; D015203:Reproducibility of Results; D023822:Tissue Engineering / Q000379:methods*
D010455:Peptides; C437167:poly(ethylene glycol)diacrylate; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols
Cell adhesion; Human induced pluripotent stem cell-derived cardiomyocytes; Methacrylated peptides; Peptide-functionalized hydrogel microarray; Poly(ethylene glycol) hydrogels; RGD peptides