α-5 Laminin Synthesized by Human Pluripotent Stem Cells Promotes Self-Renewal.

ABSTRACT: Substrate composition significantly impacts human pluripotent stem cell (hPSC) self-renewal and differentiation, but relatively little is known about the role of endogenously produced extracellular matrix (ECM) components in regulating hPSC fates. Here we identify α-5 laminin as a signature ECM component endogenously synthesized by undifferentiated hPSCs cultured on defined substrates. Inducible shRNA knockdown and Cas9-mediated disruption of the LAMA5 gene dramatically reduced hPSC self-renewal and increased apoptosis without affecting the expression of pluripotency markers. Increased self-renewal and survival was restored to wild-type levels by culturing the LAMA5-deficient cells on exogenous laminin-521. Furthermore, treatment of LAMA5-deficient cells with blebbistatin or a ROCK inhibit

SUBMITTER: Laperle A 

PROVIDER: S-EPMC4618661 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature