L-Leucine methyl ester (Leu-OMe) is a lysosomotropic compound that irreversibly removes natural killer cell (NK) function from human peripheral blood mononuclear cells. This effect was dependent on the presence of mononuclear phagocytes (Mφ) or polymorphonuclear leukocytes (PMN) and was prevented by lysosomal inhibitors such as chloroquine or NH4Cl. When Mφ or PMN were incubated with Leu-OMe, a product was formed that eliminated all NK function from mixed lymphocyte populations. This effect did not require the presence of Mφ or PMN and was not prevented by lysosomal enzyme inhibitors. Thin-layer chromatography and mass spectral analysis revealed that this NK-toxic product was L-leucyl-L-leucine methyl ester (Leu-Leu-OMe). When human lymphocytes were exposed to >50 μM Leu-Leu-OMe for 15 min, all NK function was irreversibly eliminated. Other dipeptide methyl esters containing nonpolar L amino acids caused similar effects, but substitution with amino acids containing polar or charged side chains or with D stereoisomers produced compounds that had no toxic effect on NK. These findings indicate that Mα and PMN can regulate NK function by releasing the dipeptide condensation product Leu-Leu-OMe generated from Leu-OMe via a lysosomally mediated mechanism. The data show that specific products of lysosomal enzyme activity may have potent effects on the function of adjacent cells.
|Original language||English (US)|
|Number of pages||5|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|State||Published - 1985|
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