Culture surface protein coatings affect the barrier properties and calcium signalling of hESC-RPE

Sci Rep. 2021 Jan 13;11(1):933. doi: 10.1038/s41598-020-79638-8.


Human pluripotent stem cell-derived retinal pigment epithelium (RPE) transplantation is currently under evaluation as treatment for macular degeneration. For therapeutic applications, cryostorage during cell production is typically needed with potential consequences to cell functionality. We have previously shown that the culture substrate affects human embryonic stem cell-derived RPE (hESC-RPE) properties in fresh cultures. Here, we aimed to further identify the role of RPE basement membrane proteins type IV collagen (Col-IV), laminin (LN), and nidogen-1 in the maturation and functionality of hESC-RPE after cryopreservation. In addition to cell attachment and morphology, transepithelial electrical resistance, expression of key RPE proteins, phagocytosis capacity and Ca2+ signalling were analysed. After cryostorage, attachment of hESC-RPE on culture surfaces coated with Col-IV alone was poor. Combining Col-IV and LN with or without nidogen-1 significantly improved cell attachment and barrier properties of the epithelium. Furthermore, functional homogeneity of the hESC-RPE monolayer was enhanced in the presence of nidogen-1. Our results suggest that the choice of coating proteins for the cell culture may have implications to the functional properties of these cells after cryostorage cell banking.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Basement Membrane / metabolism
  • Calcium / metabolism
  • Calcium Signaling
  • Cell Differentiation
  • Collagen Type IV / metabolism
  • Cryopreservation / methods*
  • Humans
  • Laminin / metabolism
  • Macular Degeneration / metabolism
  • Membrane Glycoproteins / metabolism
  • Membrane Proteins / metabolism
  • Phagocytosis / physiology
  • Pluripotent Stem Cells / cytology
  • Pluripotent Stem Cells / metabolism
  • Retinal Pigment Epithelium / metabolism*
  • Retinal Pigment Epithelium / physiology
  • Retinal Pigment Epithelium / transplantation
  • Specimen Handling / methods
  • Stem Cell Transplantation / methods*


  • Collagen Type IV
  • Laminin
  • Membrane Glycoproteins
  • Membrane Proteins
  • nidogen
  • Calcium