We describe the development of a nanoparticle platform that overcomes the immunosuppressive tumor microenvironment. These nanoparticles are coated with two different antibodies that simultaneously block the inhibitory checkpoint PD-L1 signal and stimulate T cells via the 4-1BB co-stimulatory pathway. These “immunoswitch” particles significantly delay tumor growth and extend survival in multiple in vivo models of murine melanoma and colon cancer in comparison to the use of soluble antibodies or nanoparticles separately conjugated with the inhibitory and stimulating antibodies. Immunoswitch particles enhance effector-target cell conjugation and bypass the requirement for a priori knowledge of tumor antigens. The use of the immunoswitch nanoparticles resulted in an increased density, specificity, and in vivo functionality of tumor-infiltrating CD8+ T cells. Changes in the T cell receptor repertoire against a single tumor antigen indicate immunoswitch particles expand an effective set of T cell clones. Our data show the potential of a signal-switching approach to cancer immunotherapy that simultaneously targets two stages of the cancer immunity cycle resulting in robust antitumor activity.
Alyssa K. Kosmides
Want To Publish your Group Article?
Click HERE to send us your group Article for publishing on our website.
- alzheimer Alzheimers Disease animal model antibiotic resistance antibiotics Bacteria Brain breast cancer cancer cell-signaling clinical trials CRISPR diabetes disease/medicine DNA drug drug research Gene Expression general health Gene therapy Genetics genetics & genomics Genomics HIV immunology immunotherapy infectious disease Malaria microbiology microbiome mutation neuroscience new therapy obesity Parkinson's disease stem cells T cells techniques therapy treatment tumor vaccine virology virus Zika virus