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2017 ; 6
(5
): e1308616
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Blockade of only TGF-? 1 and 2 is sufficient to enhance the efficacy of vaccine
and PD-1 checkpoint blockade immunotherapy
#MMPMID28638730
Terabe M
; Robertson FC
; Clark K
; De Ravin E
; Bloom A
; Venzon DJ
; Kato S
; Mirza A
; Berzofsky JA
Oncoimmunology
2017[]; 6
(5
): e1308616
PMID28638730
show ga
Checkpoint inhibition has established immunotherapy as a major modality of cancer
treatment. However, the success of cancer immunotherapy is still limited as
immune regulation of tumor immunity is very complicated and mechanisms involved
may also differ among cancer types. Beside checkpoints, other good candidates for
immunotherapy are immunosuppressive cytokines. TGF-? is a very potent
immunosuppressive cytokine involved in suppression of tumor immunity and also
necessary for the function of some regulatory cells. TGF-? has three isoforms,
TGF-? 1, 2 and 3. It has been demonstrated in multiple mouse tumor models that
inhibition of all three isoforms of TGF-? facilitates natural tumor
immunosurveillance and tumor vaccine efficacy. However, individual isoforms of
TGF-? are not well studied yet. Here, by using monoclonal antibodies (mAbs)
specific for TGF-? isoforms, we asked whether it is necessary to inhibit TGF-?3
to enhance tumor immunity. We found that blockade of TGF-?1 and 2 and of all
isoforms provided similar effects on tumor natural immunosurveillance and
therapeutic vaccine-induced tumor immunity. The protection was CD8(+) T
cell-dependent. Blockade of TGF-? increased vaccine-induced Th1-type response
measured by IFN? production or T-bet expression in both tumor draining lymph
nodes and tumors, although it did not increase tumor antigen-specific CD8(+) T
cell numbers. Therefore, protection correlated with qualitative rather than
quantitative changes in T cells. Furthermore, when combined with PD-1 blockade,
blockade of TGF-?1 and 2 further increased vaccine efficacy. In conclusion,
blocking TGF-?1 and 2 is sufficient to enhance tumor immunity, and it can be
further enhanced with PD-1 blockade.