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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 Cancer+Gene+Ther
2015 ; 22
(3
): 154-62
Nephropedia Template TP
gab.com Text
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The addition of recombinant vaccinia HER2/neu to oncolytic vaccinia-GMCSF given
into the tumor microenvironment overcomes MDSC-mediated immune escape and
systemic anergy
#MMPMID25633483
de Vries CR
; Monken CE
; Lattime EC
Cancer Gene Ther
2015[Apr]; 22
(3
): 154-62
PMID25633483
show ga
Effective immunotherapeutic strategies require the ability to generate a systemic
antigen-specific response capable of impacting both primary and metastatic
disease. We have built on our oncolytic vaccinia a granulocyte-macrophage
colony-stimulating factor (GM-CSF) strategy by adding recombinant tumor antigen
to increase the response in the tumor microenvironment and systemically. In the
present study, orthotopic growth of a syngeneic HER2/neu-overexpressing mammary
carcinoma in FVB/N mice (NBT1) was associated with increased Gr1(+)CD11b(+)
myeloid-derived suppressor cells (MDSCs) both systemically and in the tumor
microenvironment. This MDSC population had inhibitory effects on the
HER2/neu-specific Th1 immune response. VVneu and VVGMCSF are recombinant
oncolytic vaccinia viruses that encode HER2/neu and GM-CSF, respectively. Naive
FVB mice vaccinated with combined VVneu and VVGMCSF given systemically developed
systemic HER2/neu-specific immunity. NBT1-bearing mice became anergic to systemic
immunization with combined VVneu and VVGMCSF. Intratumoral VVGMCSF failed to
result in systemic antitumor immunity until combined with intratumoral VVneu.
Infection/transfection of the tumor microenvironment with combined VVGMCSF and
VVneu resulted in development of systemic tumor-specific immunity, reduction in
splenic and tumor MDSC and therapeutic efficacy against tumors. These studies
demonstrate the enhanced efficacy of oncolytic vaccinia virus recombinants
encoding combined tumor antigen and GM-CSF in modulating the microenvironment of
MDSC-rich tumors.