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2017 ; 24
(1
): 21-30
Nephropedia Template TP
gab.com Text
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English Wikipedia
Prime-boost using separate oncolytic viruses in combination with checkpoint
blockade improves anti-tumour therapy
#MMPMID27779616
Ilett E
; Kottke T
; Thompson J
; Rajani K
; Zaidi S
; Evgin L
; Coffey M
; Ralph C
; Diaz R
; Pandha H
; Harrington K
; Selby P
; Bram R
; Melcher A
; Vile R
Gene Ther
2017[Jan]; 24
(1
): 21-30
PMID27779616
show ga
The anti-tumour effects associated with oncolytic virus therapy are mediated
significantly through immune-mediated mechanisms, which depend both on the type
of virus and the route of delivery. Here, we show that intra-tumoral oncolysis by
Reovirus induced the priming of a CD8+, Th1-type anti-tumour response. By
contrast, systemically delivered Vesicular Stomatitis Virus expressing a cDNA
library of melanoma antigens (VSV-ASMEL) promoted a potent anti-tumour CD4+ Th17
response. Therefore, we hypothesised that combining the Reovirus-induced CD8+ T
cell response, with the VSV-ASMEL CD4+ Th17 helper response, would produce
enhanced anti-tumour activity. Consistent with this, priming with intra-tumoral
Reovirus, followed by an intra-venous VSV-ASMEL Th17 boost, significantly
improved survival of mice bearing established subcutaneous B16 melanoma tumours.
We also show that combination of either therapy alone with anti-PD-1 immune
checkpoint blockade augmented both the Th1 response induced by systemically
delivered Reovirus in combination with GM-CSF, and also the Th17 response induced
by VSV-ASMEL. Significantly, anti-PD-1 also uncovered an anti-tumour Th1 response
following VSV-ASMEL treatment that was not seen in the absence of checkpoint
blockade. Finally, the combination of all three treatments (priming with
systemically delivered Reovirus, followed by double boosting with systemic
VSV-ASMEL and anti-PD-1) significantly enhanced survival, with long-term cures,
compared to any individual, or double, combination therapies, associated with
strong Th1 and Th17 responses to tumour antigens. Our data show that it is
possible to generate fully systemic, highly effective anti-tumour
immunovirotherapy by combining oncolytic viruses, along with immune checkpoint
blockade, to induce complementary mechanisms of anti-tumour immune responses.