Journal
CELLULAR IMMUNOLOGY
Volume 316, Issue -, Pages 1-10Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.cellimm.2017.04.005
Keywords
M1/M2; Macrophages; Immune response; Tumor; Tumor microenvironment
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Funding
- University Grants Commission, New Delhi, India [F. 2-3/2000(SA-I)]
- DST-SERB, New Delhi, India, Young Scientist Award [SB/YS/LS-289/2013]
- DST-INSPIRE Fellowship, New Delhi, India [DST/INSPIRE FELLOWSHIP/2011/188]
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Recent advances in tumor biology demand detailed analysis of the complex interaction of tumor cells with their adjacent microenvironment (tumor aroma) to understand the various mechanisms involved in tumor growth and metastasis. Mononuclear phagocytes or macrophages, a type of innate immune cells, defend the organism against infection and injury. On the otherhand, tumor associated macrophages (TAMs) constitute a significant part of the tumor-infiltrating immune cells, have been linked to the growth, angiogenesis, and metastasis of a variety of cancers, most likely through polarization of TAMs to the M2 (alternative) phenotype. Clinical and experimental evidences have shown that cancer tissues with high infiltration of TAMs are associated with poor patient prognosis and resistance to therapies, thus, targeting of TAMs in tumors is considered as a promising immunotherapeutic strategy. Depletion of M2 TAMs or 're-education' of them as anti-tumor effectors might contribute significantly to the search of new modalities in anti-cancer treatments. Basic questions on the factors responsible for homing of macrophages in tumors, mechanism of conversion of M1 to IVI2 TAMs, their functionality and, finally, the possible ways to target M2 TAMs are discussed.
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