期刊
TRANSLATIONAL RESEARCH
卷 191, 期 -, 页码 64-80出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.trsl.2017.11.002
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资金
- NCI NIH HHS [R01 CA220000, K08 CA191139] Funding Source: Medline
- NATIONAL CANCER INSTITUTE [K08CA191139, R01CA220000] Funding Source: NIH RePORTER
Increasing experimental and clinical evidence has revealed a critical role for myeloid cells in the development and progression of cancer. The ability of monocytes and macrophages to regulate inflammation allows them to manipulate the tumor microenvironment to support the growth and development of malignant cells. Recent studies have shown that macrophages can exist in several functional states depending on the microenvironment they encounter in the tissue. These functional phenotypes influence not only the genesis and propagation of tumors, but also the efficacy of cancer therapies, particularly radiation. Early classification of the macrophage phenotypes, or polarization states, identified 2 major states, MI and M2, that have cytotoxic and wound repair capacity, respectively. In the context of tumors, classically activated or M1 macrophages driven by interferon-gamma support antitumor immunity while alternatively activated or M2 macrophages generated in part from interleukin-4 exposure hinder antitumor immunity by suppressing cytotoxic responses against a tumor. In this review, we discuss the role that the functional phenotype of a macrophage population plays in tumor development. We will then focus specifically on how macrophages and myeloid cells regulate the tumor response to radiation therapy.
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