当前位置： SCI文献检索 > OncoImmunology期刊下所有文献 > Intratumorally delivered formulation, INT230-6, containing potent anticancer agents induces protective T cell immunity and memory.

Intratumorally delivered formulation, INT230-6, containing potent anticancer agents induces protective T cell immunity and memory.

Abstract：

:The benefits of anti-cancer agents extend beyond direct tumor killing. One aspect of cell death is the potential to release antigens that initiate adaptive immune responses. Here, a diffusion enhanced formulation, INT230-6, containing potent anti-cancer cytotoxic agents, was administered intratumorally into large (approx. 300mm3) subcutaneous murine Colon26 tumors. Treatment resulted in regression from baseline in 100% of the tumors and complete response in up to 90%. CD8+ or CD8+/CD4+ T cell double-depletion at treatment onset prevented complete responses, indicating a critical role of T cells in promoting complete tumor regression. Mice with complete response were protected from subcutaneous and intravenous re-challenge of Colon26 cells in a CD4+/CD8+ dependent manner. Thus, immunological T cell memory was induced by INT230-6. Colon26 tumors express the endogenous retroviral protein gp70 containing the CD8+ T-cell AH-1 epitope. AH-1-specific CD8+ T cells were detected in peripheral blood of tumor-bearing mice and their frequency increased 14 days after treatment onset. AH-1-specific CD8+ T cells were also significantly enriched in tumors of untreated mice. These cells had an activated phenotype and highly expressed Programmed cell-death protein-1 (PD-1) but did not lead to tumor regression. CD8+ T cell tumor infiltrate also increased 11 days after treatment. INT230-6 synergized with checkpoint blockade, inducing a complete remission of the primary tumors and shrinking of untreated contralateral tumors, which demonstrates not only a local but also systemic immunological effect of the combined therapy. Similar T-cell dependent inhibition of tumor growth was also found in an orthotopic 4T1 breast cancer model.

journal_name

Oncoimmunology

journal_title

Oncoimmunology

authors

Bloom AC,Bender LH,Tiwary S,Pasquet L,Clark K,Jiang T,Xia Z,Morales-Kastresana A,Jones JC,Walters I,Terabe M,Berzofsky JA

doi

10.1080/2162402X.2019.1625687

subject

Has Abstract

pub_date

2019-07-16 00:00:00

pages

e1625687

issue

eissn

2162-4011

issn

2162-402X

pii

1625687

journal_volume

pub_type

杂志文章

在线工具

Intratumorally delivered formulation, INT230-6, containing potent anticancer agents induces protective T cell immunity and memory.