The potential for monocyte-mediated immunotherapy during infection and malignancy. Part I: apoptosis induction and cytotoxic mechanisms

Leukemia & Lymphoma
M A WilliamsS M Kelsey

Abstract

The mononuclear phagocyte system consists of peripheral blood monocytes and tissue macrophages that collectively play a major role in host immunity. Far from existing solely as phagocytic scavengers of cell debris and foreign matter, monocytes are highly active and responsive to inflammatory and immunological signals that activate their microbicidal and tumoricidal functions. Cytokines that are secreted as an integral component of the innate immune response such as granulocyte-macrophage colony-stimulating factor (GM-CSF) and -IFN may directly activate the functions of the monocyte system. A key mediator of the effector functions of monocytes is tumour necrosis factor (TNF) which transduces its signals upon binding to specific transmembrane receptors. TNF is highly cytotoxic to micro-organisms and susceptible malignant cells and in most cases delivers its cytotoxic signal to tumour cells by highly regulated mechanisms of programmed cell death or apoptosis. We believe that the numerous functions of the monocyte system may be harnessed for therapeutic gain both in the context of microbiological infection and malignant disease. In this review, the mechanisms by which secreted and monocyte cell-membrane-associated TNF induce apopto...Continue Reading

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Citations

Jun 16, 2004·International Journal of Cancer. Journal International Du Cancer·Masaki IrieGotaro Toda
Mar 10, 2009·Toxicology and Applied Pharmacology·Navneet K DhillonAmy O'Brien-Ladner
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Jun 2, 2018·Cancer Immunology, Immunotherapy : CII·Jun YinJohn O Richards

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