期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1980
卷号：77
期号：5
页码：2895-2898
DOI：10.1073/pnas.77.5.2895
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Natural cytotoxic (NC) and natural killer (NK) cells have been defined by their ability to lyse certain solid or lymphoid tumor targets in vitro, without prior sensitization. Our present studies describe an attempt to characterize the structures involved in the effector-target recognition leading to tumor cell lysis. Addition of the monosaccharide D-mannose to the NC cell assay significantly blocked cytotoxicity of the fibrosarcoma Meth A target by the effector cells at 50 mM and lower concentrations. D-Galactose showed blocking activity in one of five experiments, only at 50 mM. L-Fucose, D-glucose, and N-acetyl-D-glucosamine did not affect NC cell cytotoxicity at similar concentrations. All of the sugars tested inhibited NK cell lysis of the lymphoma YAC-I target. None of the sugars affected killing of the appropriate target by allosensitized cytotoxic T lymphocytes. The blocking of NC-mediated cytotoxicity was not due to a direct toxic action of the sugars on the effector cells. These findings suggest that, in the NC system, recognition involves lectin-like structures with a specificity for D-mannose (or D-galactose, or both), whereas, in the NK system, such lectin-like structures are less restricted. Such structures appear not to be involved in the specific cytotoxicity mediated by T cells.
