Compositions and methods for inhibiting tumor-induced immune suppression

Abstract

It has been discovered that the cyclic peptide EnnA inactivates the Hsp90 chaperone pathway, but without activating an extensive heat shock response and overexpression of anti-apoptotic proteins. Mechanistically distinct, EnnA inhibits Hsp90 and destabilize PDL-1 and IDO, two major immune checkpoints mediating tumor-induced immune suppression. The provided herein show that EnnA profoundly modulates the cytokine signature of cancer cells and promotes a cytokine profile that favors an immune attack on tumor cells. This translates into highly efficacious anti-tumor activity in vivo, which, when combined with a single dose of chemotherapy, completely reduced the tumor burden in experimental animals and instilled highly efficient immune memory against the primary tumor.

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