Regulation of cellular function by products of lysosomal enzyme activity: elimination of human natural killer cells by a dipeptide methyl ester generated from L-leucine methyl ester by monocytes or polymorphonuclear leukocytes.

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Abstract
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 (M.vphi.) or polymorphonuclear leukocytes (PMN) and was prevented by lysosomal inhibitors such as chloroquine or NH4Cl. When M.vphi. 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 M.vphi. or PMN and was not prevented by lysosomal enzyme inhibitors. TLC 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 .mu.M 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. M.vphi. and PMN can regulate NK function by releasing the dipeptide condensation product Leu-Leu-OMe generated from Leu-OMe via a lysosomally mediated mechanism. Specific products of lysosomal enzyme activity may have potent effects on the function of adjacent cells.