Inactivation of junctional adhesion molecule-A enhances antitumoral immune response by promoting dendritic cell and T lymphocyte infiltration. Academic Article uri icon

Overview

abstract

  • Junctional adhesion molecule-A (JAM-A)-null dendritic cells (DCs) are more motile and effective than their wild-type counterpart in promoting contact hypersensitivity reaction. Here, we show that the growth and aggressiveness of pancreatic islet cell carcinoma induced by SV40 T antigen expression in beta cells (Rip1Tag2 mice) are significantly reduced in JAM-A-null mice. Because these tumor cells do not express JAM-A, we focused on changes in stroma reactivity. In the absence of JAM-A, tumors showed a small but significant reduction in angiogenesis and a marked increase in the immune reaction with enhanced infiltration of DCs (CD11c+ and MHC-II+) and CD4+ and CD8+ lymphocytes. In contrast, phagocyte number was not affected. DC capacity to produce cytokines was not significantly altered, but transmigration through JAM-A-null endothelial cells was increased as compared with JAM-A-positive endothelium. On adoptive transfer, JAM-A(-/-) DCs were recruited to tumors at slightly but significantly higher rate than JAM-A(+/+) DCs. Ablation of CD4+ and CD8+ cells with specific antibodies abrogated the inhibitory effect of JAM-A deletion on tumor growth and angiogenesis. These findings support the idea that, in the Rip1Tag2 tumor model, abrogation of JAM-A reduces cancer development by increasing antitumor immune response.

publication date

  • February 16, 2010

Research

keywords

  • CD4-Positive T-Lymphocytes
  • CD8-Positive T-Lymphocytes
  • Carcinoma, Islet Cell
  • Cell Adhesion Molecules
  • Dendritic Cells
  • Lymphocytes, Tumor-Infiltrating
  • Pancreatic Neoplasms
  • Receptors, Cell Surface

Identity

Scopus Document Identifier

  • 77950250457

Digital Object Identifier (DOI)

  • 10.1158/0008-5472.CAN-09-1703

PubMed ID

  • 20160037

Additional Document Info

volume

  • 70

issue

  • 5