Summary
Little is known regarding the effectors of lymphokine-activated killer activity. Lysosomotropic agents such as quinacrine can be used to positively sort for lysosome rich cells in natural killer (NK) cell populations. We therefore decided to use this agent to sort lymphokine-activated killer (LAK) cells to characterize their lysosomal content. We found that the positively sorted population contained all the LAK activity, i.e., lysis of NK-resistant tumor cells (B16 melanoma cell line), with the negatively sorted cells having no killing activity. Therefore separation of interleukin-2-incubated cells for LAK activity could be accomplished using sorting after quinacrine staining. The treatment of positively sorted LAK cell populations with L-leucine methyl ester, a lysosomotropic dye which inhibits killing by lysosome rich cells, caused abrogation of killing of the B16 tumor by the treated populations. Single cell conjugate assays were also done on these sorted cells, with positively sorted cells forming the highest and negatively sorted cells the lowest percent of conjugates. Our data therefore indicates the important role of lysosome rich cells in the LAK cell population in the murine system.
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This work was supported by NIH grants R01 CA42962 and K04 CA0122, and by intramural funds from the Norris Cancer Center
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Agah, R., Shau, H. & Mazumder, A. Lysosome rich cells contain the lytic activity of lymphokine-activated killer cell populations. Cancer Immunol Immunother 24, 247–252 (1987). https://doi.org/10.1007/BF00205638
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DOI: https://doi.org/10.1007/BF00205638