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Molecular determinants of immunogenic cell death elicited by radiation therapy

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IMMUNOLOGICAL REVIEWS
卷 -, 期 -, 页码 -

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WILEY
DOI: 10.1111/imr.13271

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ATP; calreticulin; HMGB1; immune checkpoint inhibitors; PD-L1; type I IFN

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Cancer cells undergoing immunogenic cell death (ICD) can initiate adaptive immune responses by increasing antigenicity and adjuvanticity, and having a permissive microenvironment. Immune cell infiltration and activity in the microenvironment of dying cancer cells are essential for ICD-driven immune responses to exert cytotoxic effector functions. Different forms of radiation, including non-ionizing and ionizing radiation, can elicit ICD and enhance the immunogenicity of dying cancer cells.
Cancer cells undergoing immunogenic cell death (ICD) can initiate adaptive immune responses against dead cell-associated antigens, provided that (1) said antigens are not perfectly covered by central tolerance (antigenicity), (2) cell death occurs along with the emission of immunostimulatory cytokines and damage-associated molecular patterns (DAMPs) that actively engage immune effector mechanisms (adjuvanticity), and (3) the microenvironment of dying cells is permissive for the initiation of adaptive immunity. Finally, ICD-driven immune responses can only operate and exert cytotoxic effector functions if the microenvironment of target cancer cells enables immune cell infiltration and activity. Multiple forms of radiation, including non-ionizing (ultraviolet) and ionizing radiation, elicit bona fide ICD as they increase both the antigenicity and adjuvanticity of dying cancer cells. Here, we review the molecular determinants of ICD as elicited by radiation as we critically discuss strategies to reinforce the immunogenicity of cancer cells succumbing to clinically available radiation strategies.

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