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2016 ; 7
(50
): 83088-83100
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SCIB1, a huIgG1 antibody DNA vaccination, combined with PD-1 blockade induced
efficient therapy of poorly immunogenic tumors
#MMPMID27825115
Xue W
; Brentville VA
; Symonds P
; Cook KW
; Yagita H
; Metheringham RL
; Durrant LG
Oncotarget
2016[Dec]; 7
(50
): 83088-83100
PMID27825115
show ga
PURPOSE: We have previously shown that supraoptimal signaling of high avidity T
cells leads to high expression of PD-1 and inhibition of proliferation. This
study was designed to see if this effect could be mitigated by combining a
vaccine that stimulates high avidity T cells with PD-1 blockade. EXPERIMENTAL
DESIGN: We investigated the anti-tumor effect of a huIgG1 antibody DNA vaccine
(SCIB1) and PD-1 blockade. RESULTS: Vaccination of HLA-DR4 transgenic mice with
SCIB1 induced high frequency and avidity T cell responses that resulted in
survival (40%) of mice with established B16F1-DR4 tumors. SCIB1 vaccination was
associated with increased infiltration of CD4 and CD8 T cells within the tumor
but was also associated with upregulation of PD-L1 within the tumor environment.
PD-1 blockade also resulted in increased CD8 T cell infiltration and an
anti-tumor response with 50% of mice showing long term survival. In line with our
hypothesis that PD-1/PD-L1 signaling results in inhibition of proliferation of
high avidity T cells at the tumor site, the combination of PD-1 blockade with
vaccination, enhanced the number and proliferation of the CD8 tumor infiltrate.
This resulted in a potent anti-tumor response with 80% survival of the mice.
CONCLUSIONS: There is a benefit in combining PD-1 blockade with vaccines that
induce high avidity T cell responses and in particular with SCIB1.