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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 Oct;80(20):6371–6375. doi: 10.1073/pnas.80.20.6371

Age-associated impairment of murine natural killer activity.

J W Albright, J F Albright
PMCID: PMC394299  PMID: 6604919

Abstract

Natural cell-mediated cytotoxicity may be critical in the resistance displayed by animals and humans to tumors and various pathogenic microorganisms. Because the frequency of tumors and infections increases markedly in aging populations, we have compared the natural killer (NK) competence of lymphoid tissues (spleen, bone marrow) and of peritoneal cells of young adult and aged mice. Spontaneous NK activity was much lower, and the rate of target cell lysis was much less, in aged mice. The level of NK activity was only modestly increased in old, compared to young, mice when they were exposed to Trypanosoma musculi, an organism that provides strong stimulation of NK activity. Restricted NK activity of aged mice was not attributable to suppressor cells. The NK effector cells in old mice were characterized as being nonadherent to plastic, completely susceptible to lysis by complement plus an antiserum against specificity NK 1.2, and only slightly affected by treatment with antiserum against specificity Thy-1.2. Two indirect methods were employed to assess the relative frequency of splenic NK cells at the time of maximal stimulation by T. musculi: a cytotoxicity assay with antiserum against NK 1.2 and a binding assay involving monolayers of YAC-1 tumor target cells. Similar results were obtained in both assays, indicating that at maximal stimulation about 10% of the total spleen cells of both young and old mice were NK cells. We conclude (cautiously) that the functional efficiency of aged NK cells is impaired and that this defect may account, in part, for reduced ability of aged individuals to resist certain types of cancer and certain pathogenic microorganisms.

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Selected References

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