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Article . 2008 . Peer-reviewed
License: Wiley Online Library User Agreement
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Article . 2008
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Uncommon Endocytic and Trafficking Pathway of the Natural Killer Cell CD94/NKG2A Inhibitory Receptor

Authors: Madhan, Masilamani; Sriram, Narayanan; Martha, Prieto; Francisco, Borrego; John E, Coligan;

Uncommon Endocytic and Trafficking Pathway of the Natural Killer Cell CD94/NKG2A Inhibitory Receptor

Abstract

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.

Keywords

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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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
16
Average
Average
Top 10%