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    High-Throughput Discovery of Targeted, Minimally Complex Peptide Surfaces for Human Pluripotent Stem Cell Culture

    Year: 2021

    Journal: ACS Biomater. Sci. Eng., Volume 7, APR 12, page 1344–1360

    Authors: Ramasubramanian, Anusuya; Muckom, Riya; Sugnaux, Caroline; Fuentes, Christina; Ekerdt, Barbara L.; Clark, Douglas S.; Healy, Kevin E.; Schaffer, David, V

    Organizations: National Science Foundation; Siebel Foundation; National Institutes of Health Exploratory/Developmental Research Grant [NIH R21 EY025420]; Rogers Family Foundation; Jan Fandrianto Chair Fund

    Keywords: targeted peptide; alpha(6)-integrin; laminin-mimetic; high-throughput microculture; human pluripotent stem cells; peptide self-assembled monolayers

    Human pluripotent stem cells harbor an unlimited capacity to generate therapeutically relevant cells for applications in regenerative medicine. However, to utilize these cells in the clinic, scalable culture systems that activate defined receptors and signaling pathways to sustain stem cell self-renewal are required; and synthetic materials offer considerable promise to meet these needs. De novo development of materials that target novel pathways has been stymied by a limited understanding of critical receptor interactions maintaining pluripotency. Here, we identify peptide agonists for the human pluripotent stem cell (hPSC) laminin receptor and pluripotency regulator, alpha(6)-integrin, through unbiased, library-based panning strategies. Biophysical characterization of adhesion suggests that identified peptides bind hPSCs through alpha(6)-integrin with sub-mu M dissociation constants similar to laminin. By harnessing a high-throughput microculture platform, we developed predictive guidelines for presenting these integrin-targeting peptides alongside canonical binding motifs at optimal stoichiometries to generate nascent culture surfaces. Finally, when presented as self-assembled monolayers, predicted peptide combinations supported hPSC expansion, highlighting how unbiased screens can accelerate the discovery of targeted biomaterials.
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