SOCS1 favors the epithelial-mesenchymal transition in melanoma, promotes tumor progression and prevents antitumor immunity by PD-L1 expression

Author(s):Show less -

Berzaghi, R. ; Maia, V. S. C. ; Pereira, F. V. ; Melo, F. M. ; Guedes, M. S. ; Origassa, C. S. T. ; Scutti, J. B. ; Matsuo, A. L. ; Camara, N. O. S. ; Rodrigues, E. G. ; Travassos, L. R.

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 7, JAN 12 2017.
• Web of Science Citations: 6

Abstract

Silencing of SOCS1 protein with shRNAi lentivirus (shR-SOCS1) led to partial reversion of the tumorigenic phenotype of B16F10-Nex2 melanoma cells. SOCS1 silencing inhibited cell migration and invasion as well as in vitro growth by cell cycle arrest at S phase with increased cell size and nuclei. Down-regulation of SOCS1 decreased the expression of epidermal growth factor receptor, Ins-R alpha, and fibroblast growth factor receptors. The present work aimed at analyzing the SOCS1 cell signaling and expression of proteins relevant to tumor development. An RNA microarray analysis of B16F10-Nex2 melanoma cells with SOCS1 silenced by shRNAi-SOCS1 was undertaken in comparison with cells transduced with the empty vector. Among 609 differentially expressed genes, c-Kit, Met and EphA3 cytokine/tyrosine-kinase (TK) receptors were down regulated. A significant decrease in the expression of TK receptors, the phosphorylation of mediators of ERK1/2 and p38 pathways and STAT3 (S727) were observed. Subcutaneous immunization with shR-SOCS1-transduced viable tumor cells rendered protection against melanoma in a syngeneic model, with decreased expression of PD-L1 and of matrix metallo-proteinases (MMPs) and CD-10 in those cells. The present work shows the role of SOCS1 in murine melanoma development and the potential of SOCS1-silenced tumor cells in raising an effective anti-melanoma immune response. (AU)

• FAPESP's process: 10/51423-0 - Bioactive peptides and peptidases: biological and immunobiological activities in infectious diseases and cancer
• Grantee: Luiz Rodolpho Raja Gabaglia Travassos
• Support Opportunities: Research Projects - Thematic Grants