Abstract：
:While immune checkpoint inhibition is rapidly becoming standard of care in many solid tumors, immune checkpoint inhibitors (ICIs) fail to induce clinical responses in many patients, presumably due to insufficient numbers of tumor-specific T cells in the tumor milieu. To this end, immunization protocols using viral vectors expressing tumor-associated antigens are being explored to induce T cell responses that synergize with ICIs. However, the optimal combination of vaccine and immune checkpoint regimen remains undefined. Here, a dendritic cell-targeting lentiviral vector (ZVex®) expressing the endogenous murine tyrosinase-related protein 1 (mTRP1), or the human tumor antigen NY-ESO-1, was explored as monotherapy or heterologous prime-boost (HPB) vaccine regimen together with recombinant tumor antigen in the murine B16 melanoma model. PD1/PDL1 blockade significantly enhanced ZVex/mTRP1, but not ZVex/NY-ESO-1, induced immune responses in mice, whereas the opposite effect was observed with anti-CTLA4 antibody. Anti-tumor efficacy of anti-PD1, but not anti-PDL1 or anti-CTLA4, was significantly enhanced by ZVex/mTRP1 and HPB vaccination. These results suggest mechanistic differences in the effect of checkpoint blockade on vaccine-induced immune and anti-tumor responses against self versus non-self tumor antigens, possibly due to tolerance and state of exhaustion of anti-tumor T cells.
journal_name
Vaccinejournal_title
Vaccineauthors
Albershardt TC,Parsons AJ,Reeves RS,Flynn PA,Campbell DJ,Ter Meulen J,Berglund Pdoi
10.1016/j.vaccine.2020.02.034subject
Has Abstractpub_date
2020-04-09 00:00:00pages
3369-3377issue
17eissn
0264-410Xissn
1873-2518pii
S0264-410X(20)30243-7journal_volume
38pub_type
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