Endocytosis of the TCR/CD3 complex and the class-I major histocompatibility complex in a human T cell line

Yasuhiro Yamane, Maritza Perez, Richard Edelson, Nicodemo Agostino, Benvenuto Pernis

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7 Scopus citations

Abstract

We investigated the expression of the T cell receptor (TCR)/CD3 complex on a CD4-positive human T cell lymphoma cell line treated with phorbol myristate acetate (PMA) and/or Ca2+ ionophore using fluorescence flow cytometry and fluorescence microscopic analysis. PMA induced a significant decrease in the expression of the CD3 complex on the cell membranes. Fluorescence microscopy confirmed that the down regulation is due to internalization of the antigens. Ca2+ ionophore treatment had no effect on the internalization of the CD3 complex. Double staining revealed that the vesicles containing the internalized CD3 complex and those containing intracytoplasmic class I major histocompatibility complex antigen had similar distribution in the PMA-stimulated cells, implying coexistence of these two antigens in a cytoplasmic perinuclear distribution.

Original languageEnglish
Pages (from-to)496-503
Number of pages8
JournalCellular Immunology
Volume136
Issue number2
DOIs
StatePublished - Sep 1991
Externally publishedYes

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