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-Dependent Inhibition of Tumor Angiogenesis by Tumor-Infiltrating CD4+ T Cells Requires Tumor Responsiveness to IFN-
1
Department of Microbiology, University of Pennsylvania, Philadelphia, PA 19104
The importance of CD4+ T cells in the induction of an
optimal antitumor immune response has largely been attributed to their
ability to provide costimulatory signals for the priming of MHC class
I-restricted CD8+ CTL. However, many reports have
demonstrated a requirement for CD4+ T cells in the effector
phase of tumor rejection indicating a greater responsibility for
CD4+ T cells in controlling tumor outgrowth. We demonstrate
here a critical role for CD4+ T cells in restraining
initial tumor development through the inhibition of tumor angiogenesis.
Using a tumor variant that is unresponsive to IFN-
, we show that
tumor responsiveness to IFN-
is necessary for IFN-
-dependent
inhibition of tumor angiogenesis by CD4+ T cells. These
studies reveal a pivotal role for CD4+ T cells in
controlling early tumor development through inhibition of tumor
angiogenesis.
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