Modified BIGH3 with an RGDRGD Motif Promotes Human Corneal Epithelial Cell Adhesion and Migration In Vitro

Abstract

Purpose: BIGH3 protein plays an important role in mediating human corneal epithelial (HCE) cell adhesion and migration. The aim of this study was to investigate the effects of native and modified BIGH3 protein containing an Arg-Gly-Asp-Arg-Gly-Asp (RGDRGD) motif on the adhesion and migration of HCE cells. Methods: A modified human BIGH3 gene containing an RGDRGD motif was obtained by rapid site-directed mutagenesis. Recombinant human native and modified BIGH3 proteins were then obtained and purified. The effects of the native and the modified version on the adhesion and migration of HCE cells were examined in the presence or absence of anti-α₃₁ antibody or anti-BIGH3 antibody or RGD peptide in vitro. Results: Recombinant native and modified BIGH3 proteins were successfully obtained and significantly promoted the adhesion and migration of human HCE cells in vitro, and the construct with the RGDRGD motif was more effective. The enhanced adhesion and migration were blocked by anti-α₃β₁antibody or anti-BIGH3 antibody or RGD peptide. Conclusion: BIGH3 promotes HCE cell adhesion and migration; modified RGDRGD-BIGH3 was more effective than native BIGH, and this is mediated by the Arg-Gly-Asp (RGD) motif and α₃β₁integrin in a RGD-dependent manner.

KEYWORDS:

• adhesion
• BIGH3
• human corneal epithelial cell (HCE)
• migration
• RGDRGD

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Erratum