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. 1986 Feb;51(2):547–555. doi: 10.1128/iai.51.2.547-555.1986

Correlation of natural killer cell activity and clearance of Cryptococcus neoformans from mice after adoptive transfer of splenic nylon wool-nonadherent cells.

M R Hidore, J W Murphy
PMCID: PMC262374  PMID: 3510981

Abstract

Previous reports demonstrate that natural killer (NK) cells inhibit the growth of Cryptococcus neoformans in vitro, but conclusive evidence supporting the effectiveness of NK cells in host resistance to cryptococci is not available. The objective of these studies was to assess the ability of NK cells to clear C. neoformans from the lungs, livers, and spleens of infected mice. CBA/J mice were depleted of NK cells, as well as other natural effector cells, by an intraperitoneal injection of cyclophosphamide (Cy), 240 mg/kg of body weight. One day later, 7.5 X 10(7) nylon wool-nonadherent (NWN) spleen cells, either untreated or treated with anti-asialo GM1 and complement to remove NK cells, were adoptively transferred to Cy-pretreated mice. On day 2 after Cy treatment, the mice were injected intravenously with 2 X 10(4) cryptococci. At 4 and 6 days after Cy treatment, tissues were assayed for NK reactivity, using a 4-h 51Cr-release assay, and for in vivo clearance of cryptococci as reflected by mean log10 CFU per organ. We observed that Cy treatment depleted NK activity against YAC-1 targets and reduced in vivo clearance of C. neoformans from the tissues of infected mice. Additionally, Cy treatment depleted the total lung and spleen cellularity and the total number of peripheral blood lymphocytes when compared with those in normal untreated control mice. Also, spleen weights were significantly decreased in comparison with those of untreated animals 4 days after Cy treatment. Adoptive transfer of untreated NWN spleen cells into Cy-depressed mice restored the NK cell activity which correlated with enhanced clearance of cryptococci from lungs, livers, and spleens. In contrast, treatment of NWN spleen cells with anti-asialo GM1 and complement before adoptive transfer abrogated the ability of these cells to restore NK activity or reduce the numbers of cryptococci present in tissues of infected mice. Taken together, these data indicate that NK cells are the cells effective in diminishing the numbers of cryptococci in tissues of infected mice. Consequently, NK cells may play a role in first-line host resistance against C. neoformans.

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Selected References

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