ULTRASTRUCTURAL-LOCALIZATION OF ALPHA-NAPHTHYL ACID ESTERASE IN HUMAN LYMPHOCYTES-TM

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  • 1 January 1981
    • journal article
    • research article
    • Vol. 105  (1) , 40-46
Abstract
The localization of .alpha.-naphthyl acid esterase (ANAE) activity in T lymphocytes with receptors for IgM (TM cells) was studied by EM. The electron-opaque product of the cytochemical reaction was detected around, but never inside, single (or groups of) vesicles, which suggested a possible membrane localization of the enzyme activity. These same vesicles were found to contain acid phosphatase by both light-microscopy and EM examination and were bound by unit membranes; they likely represent primary lysosomes. The presence of such lysosomes in a restricted paranuclear area is a distinctive feature of TM cells.

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