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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2013 ; 190
(11
): 5874-81
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Radiation-induced equilibrium is a balance between tumor cell proliferation and T
cell-mediated killing
#MMPMID23630355
Liang H
; Deng L
; Chmura S
; Burnette B
; Liadis N
; Darga T
; Beckett MA
; Lingen MW
; Witt M
; Weichselbaum RR
; Fu YX
J Immunol
2013[Jun]; 190
(11
): 5874-81
PMID23630355
show ga
Local failures following radiation therapy are multifactorial, and the
contributions of the tumor and the host are complex. Current models of tumor
equilibrium suggest that a balance exists between cell birth and cell death due
to insufficient angiogenesis, immune effects, or intrinsic cellular factors. We
investigated whether host immune responses contribute to radiation-induced tumor
equilibrium in animal models. We report an essential role for immune cells and
their cytokines in suppressing tumor cell regrowth in two experimental animal
model systems. Depletion of T cells or neutralization of IFN-? reversed
radiation-induced equilibrium, leading to tumor regrowth. We also demonstrate
that PD-L1 blockade augments T cell responses, leading to rejection of tumors in
radiation-induced equilibrium. We identify an active interplay between tumor
cells and immune cells that occurs in radiation-induced tumor equilibrium and
suggest a potential role for disruption of the PD-L1/PD-1 axis in increasing
local tumor control.