On July 24, 2018 BioXcel Therapeutics, Inc. ("BTI") (Nasdaq: BTAI), is a clinical stage biopharmaceutical development company utilizing proprietary artificial intelligence approaches to identify the next wave of medicines across neuroscience and immuno-oncology, reported that dipeptidyl peptidase (DPP) 8/9 inhibition, the primary mechanism of action of its lead immuno-oncology candidate, BXCL701, was highlighted in an article in the July 2018 edition of the peer-reviewed journal Nature Medicine (Press release, BioXcel Therapeutics, JUL 24, 2018, View Source [SID1234527859]).
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BXCL701 is a potential first-in-class, highly potent oral small molecule immuno-modulator that has demonstrated single agent activity in melanoma, with an established safety profile from 700 healthy subjects and cancer patients. It is designed to stimulate both the innate and acquired immune systems by inhibiting DPP8/9 and blocking immune evasion by inhibiting Fibroblast Activation Protein (FAP).
The paper titled "DPP8/DPP9 inhibitor-induced pyroptosis for treatment of acute myeloid leukemia" by Darren C. Johnson, et al., concluded that activation of caspase recruitment domain-containing protein 8 (CARD8) acts as an inflammasome sensor to activate caspase-1 and mediates DPP8/9 inhibitor-induced cell death in myeloid cells(1). This therapeutic strategy serves as a potential pathway for direct cytotoxicity of acute myeloid leukemia (AML) cells and indirect response to solid tumors. Multiple prior studies have established DPP8/9 as a novel immune checkpoint that controls the activation of the innate immune system(2),(3)
"BXCL701 is novel in its ability to stimulate both the innate and acquired immune systems by inhibiting DPP8/9 and blocking immune evasion by inhibiting FAP," said Vimal Mehta, PhD, Chief Executive Officer of BTI. "This publication highlights one component of BXCL701’s dual mechanism of action, providing valuable insights on the effects of DPP8/9 inhibition. BXCL701 differentiates itself by activating the innate immune system and stimulating neutrophils, natural killer cells and effector T cells. The paper provides further mechanistic understanding of DPP8/9 inhibition and validates its importance as a promising therapeutic approach, not only for solid tumors but for hematologic malignancies as well."
BTI expects to initiate Phase 2 proof of concept studies evaluating BXCL701 in pancreatic cancer and tNEPC later this year. BTI is also evaluating BXCL701’s potential in additional indications, both as a monotherapy and in combination with other immuno-oncology agents and partnering strategies.
Vincent J. O’Neill, MD, Chief Medical Officer of BTI added, "BXCL701 has generated compelling preclinical data in pancreatic cancer and a variety of other tumor models. Particularly exciting is its ability to block immune evasion and aid in the formation of memory T-cells, which may support long-term immunity in certain types of cancer as presented by BTI at ASCO (Free ASCO Whitepaper) 2018(4)."
This study in AML led by Dr. Bachovchin’s team at the Memorial Sloan Kettering Cancer Center and the Weil Cornell Graduate School of Medical Sciences, demonstrates that the therapeutic potential of a DPP8/9 inhibitor such as BXCL701 can extend beyond solid tumors into hematologic malignancies.
Dr O’Neill concluded, "We look forward to further evaluating BXCL701 in our lead indications, and potentially expanding its application to other cancer types."
(1) Johnson, DC, et al. DPP8/DPP9 inhibitor-induced pyroptosis for treatment of acute myeloid leukemia." Nat Med (2018), PMID: 29967349; DOI:10.1038/s41591-018-0082-y
(2) Okondo, Marian C., et al. "DPP8 and DPP9 inhibition induces pro-caspase-1-dependent monocyte and macrophage pyroptosis." Nat Chem Biol 13.1 (2017): 46-53. PMID: 27820798; DOI:10.1038/nchembio.2229
(3) Okondo, Marian C., et al. "Inhibition of Dpp8/9 activates the Nlrp1b inflammasome." Cell Chem Biol 25.3 (2018): 262-267. PMID: 29396289; DOI:10.1016/j.chembiol.2017.12.013
(4) Rastelli et al., Presented at ASCO (Free ASCO Whitepaper) 2018, Illinois, Abstract #3085