title: Spontaneous cell-mediated cytotoxicity (SCMC) associated with lymphocytes negative for acid alpha-naphthyl acetate esterase (ANAE) activity.
abstract: A modified histochemical procedure for nonspecific acid alpha-naphthyl acetate esterase (ANAE) activity in human lymphocytes was used to identify a subpopulation of E-rosette forming cells. Performing a one hour reaction at pH 6.5 the distinct dot-like staining pattern was almost exclusively observed on high affinity E-rosettes which sedimented readily in a regular Ficoll-Metrizoate gradient. By combining latex phagocytosis with staining for ANAE activity, a clear-cut distinction between mononuclear phagocytes and lymphocytes could be made. An attempt was undertaken to relate the ANAE marker on human lymphocytes to their functional capacity in spontaneous cell-mediated cytotoxicity (SCMC) reactions. Using as targets two allogeneic (K562,IGR3) and a xenogeneic cell line (L1210) it could be clearly demonstrated that high SCMC activity is mediated by ANAE negative mononuclear cells, whereas enrichment for ANAE positive lymphocytes resulted in a loss of SCMC.
mesh_terms: D000328:Adult; D002265:Carboxylic Ester Hydrolases / Q000378:metabolism*; D002478:Cells, Cultured; D003602:Cytotoxicity, Immunologic; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008214:Lymphocytes / Q000201:enzymology / Q000276:immunology*; D008297:Male; D009283:Naphthol AS D Esterase / Q000378:metabolism*; D012397:Rosette Formation; D013194:Staining and Labeling
chemical_list: D009283:Naphthol AS D Esterase; D002265:Carboxylic Ester Hydrolases