Uncommon Endocytic and Trafficking Pathway of the Natural Killer Cell CD94/NKG2A Inhibitory Receptor
pmid: 18363778
Uncommon Endocytic and Trafficking Pathway of the Natural Killer Cell CD94/NKG2A Inhibitory Receptor
The CD94/NKG2A inhibitory receptor, expressed by natural killer and T cells, is constantly exposed to its HLA‐E ligand expressed by surrounding cells. Ligand exposure often induces receptor downregulation. For CD94/NKG2A, this could potentiate activation receptor(s) induced responses to normal bystander cells. We investigated CD94/NKG2A endocytosis and found that it occurs by an amiloride‐sensitive, Rac1‐dependent macropinocytic‐like process; however, it does not require clathrin, dynamin, ADP ribosylation factor‐6, phosphoinositide‐3 kinase or the actin cytoskeleton. Once endocytosed, CD94/NKG2A traffics to early endosomal antigen 1+, Rab5+ early endosomes. It does appear in Rab4+ early/sorting endosome, but, in the time period examined, fails to reach Rab11+ recycling or Rab7+ late endosomes or lysosome‐associated membrane protein‐1+ lysosomes. These results indicate that CD94/NKG2A utilizes a previously undescribed endocytic mechanism coupled with an abbreviated trafficking pattern, perhaps to insure surface expression.
- National Institute of Health Pakistan
- Icahn School of Medicine at Mount Sinai United States
- National Institute of Allergy and Infectious Diseases United States
- National Institutes of Health United States
Dynamins, Green Fluorescent Proteins, Hydrazones, Endocytosis, Killer Cells, Natural, Protein Transport, ADP-Ribosylation Factor 6, Humans, Receptors, Natural Killer Cell, RNA Interference, RNA, Small Interfering, Receptors, Immunologic, Fluorescent Antibody Technique, Indirect, NK Cell Lectin-Like Receptor Subfamily C, NK Cell Lectin-Like Receptor Subfamily D
Dynamins, Green Fluorescent Proteins, Hydrazones, Endocytosis, Killer Cells, Natural, Protein Transport, ADP-Ribosylation Factor 6, Humans, Receptors, Natural Killer Cell, RNA Interference, RNA, Small Interfering, Receptors, Immunologic, Fluorescent Antibody Technique, Indirect, NK Cell Lectin-Like Receptor Subfamily C, NK Cell Lectin-Like Receptor Subfamily D
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