- Oral presentation
- Open Access
Cancer therapy by resuscitating Notch immune surveillance
© Shanker et al; licensee BioMed Central Ltd. 2014
Published: 24 February 2014
The immunosuppressive tumor microenvironment perturbs numerous immune regulatory networks and usurps host antitumor immunity. We discovered that tumor interferes with host hematopoietic Notch system in lung cancer patients . The resultant decrease in immune Notch signaling could be a major causative link in the inadequate induction of antitumor immunity. Interestingly, administration of the novel Delta-like ligand 1 (DLL1) multivalent cluster  and the FDA-approved proteasome inhibitor drug bortezomib, which also sensitizes tumors to death signals [2, 3], restored the tumor-induced decrease in immune Notch. Bortezomib increased the expression of Notch target genes Hes1 and Hey1 in thymus, lymph node, and spleen of tumor-bearing mice. Moreover, bortezomib administration decreased the proportion of regulatory T cells and enhanced antitumor T cell production of IFN-γ. Results indicate that bortezomib-induced activation of Notch target genes Hes1 and Hey1 is through its inhibition of NFκB while its activation of Deltex1 is mediated via PI3K. The potential of modulating antitumor Notch signaling by the prototypic DLL1 cluster in combination with bortezomib presents exciting opportunities to uncover multi-pronged immune stimulatory regimens. Therapeutic restoration of immune Notch signaling by bortezomib could provide effective treatment and recurrence-free survival in cancer patients by breaking tumor resistance, enhancing immune surveillance, and sustaining robust anti-tumor immunity.
- Huang Y: Resuscitating cancer immunosurveillance: selective stimulation of DLL1-Notch signaling in T cells rescues T-cell function and inhibits tumor growth. Cancer Res. 2011, 71 (19): 6122-31. 10.1158/0008-5472.CAN-10-4366.PubMed CentralView ArticlePubMedGoogle Scholar
- Jazirehi AR, Economou JS: Proteasome inhibition blocks NF-kappaB and ERK1/2 pathways, restores antigen expression, and sensitizes resistant human melanoma to TCR-engineered CTLs. Mol Cancer Ther. 2012, 11 (6): 1332-41. 10.1158/1535-7163.MCT-11-0814.PubMed CentralView ArticlePubMedGoogle Scholar
- Shanker A: Treating metastatic solid tumors with bortezomib and a tumor necrosis factor-related apoptosis-inducing ligand receptor agonist antibody. J Natl Cancer Inst. 2008, 100 (9): 649-62. 10.1093/jnci/djn113.PubMed CentralView ArticlePubMedGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.