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A double staining method involving the sequential use of monoclonal OKT hybridoma antibodies applied in the colloidal immunogold method and followed by a simultaneously capturing azo dye method for the detection of acid alpha-naphthyl acetate esterase (ANAE) is described. Mononuclear leukocytes isolated from human peripheral blood using a Ficoll-Hypaque density gradient were stained. M-pattern ANAE-positive monocytes (diffuse staining) were excluded from the lymphocyte counts. 80 +/- 5% of all lymphocytes were T-pattern ANAE positive (dot-like staining) and 77 +/- 3% were OKT3 positive. 86 +/- 6% of all ANAE-positive T-pattern lymphocytes were also OKT3 positive, and 89 +/- 6% of all OKT3-positive lymphocytes were also ANAE positive. This indicates that ANAE is a good marker for total human T lymphocytes. 53 +/- 10% of human peripheral blood lymphocytes were OKT4 positive and 87 +/- 8% of all OKT4-positive lymphocytes were also ANAE positive. 30 +/- 6% of all lymphocytes were OKT8 positive, and only 26 +/- 18% of all OKT8-positive lymphocytes were ANAE negative. This indicates that ANAE cannot be used to distinguish T-helper and T-suppressor lymphocytes as identified by monoclonal antibodies.

A method for the identification of human peripheral blood T lymphocytes by sequential immunogold and esterase double staining.