CD47 is a Potential Target for the Treatment of Laryngeal Squamous Cell Carcinoma.

Background/Aims: This study aims to investigate the effect of CD47 on the development of laryngeal squamous cell carcinoma (LSCC) and the therapeutic potential of monoclonal antibody against CD47 and its ligand SIRP alpha in the treatment of LSCC. Methods: We firstly detected the expressions of CD47 mRNA and protein in LSCC and para-carcinoma tissues, introduced the most efficient CD47siRNA sequence into LSCC cells by lentiviral transfection and employed three monoclonal antibodies to evaluate their anti-LSCC effects in vitro and in vivo. Results: We observed that the mRNA and protein expressions of CD47 in LSCC tissue had significant increase in LSCC tissues compared with those in para-carcinoma tissue (p < 0.05). After the treatments of three monoclonal antibodies, i.e. anti-SIRP alpha, anti CD47 BRIC126, anti-CD47 B6H12.2, in rats transfected with Hep-2 cell, it has been showed that the mRNA and protein expressions of CD47 in LSCC tissue decreased, macrophage efficiency was promoted when anti-SIRPa and/or CD47siRNA were used, the amounts, viabilities and expressions of CD47 protein of tumor cell were significantly inhibited. Additionally, combined use of CD47siRNA and anti-SIRPa seemed more efficient than solo use of CD47siRNA/antiSIRP alpha. Conclusion: The results suggested a critical role of CD47 in LSCC development and the promising treatment of antiCD47/SIRP alpha and/or CD47siRNA in LSCC. (C) 2016 The Author(s) Published by S. Karger AG, Basel