Abstract

The term “Natural Killer T (NKT) cells” was first used in the 1990s to designate T lymphocytes expressing the NK marker NK1.1 (NKR-P1A or CD161). Subsequently, this population turned out to be quite heterogeneous and it is now well-established that it includes several subsets with distinct functional capacities. Among them, the invariant NKT (iNKT) cells are at present the most abundant and best characterized subset. They express the invariant Vα14J αϕ0α18 chain in mice and the Vα14J α18 chain in humans, preferentially paired with limited TCR Vβ chains. This particular T cell population, which recognizes glycolipids instead of peptides, is implicated in the severity of experimental allergic asthma. The influence of iNKT cells in the human pathology is still a matter of discussion. Here, we will briefly address these points in the following paragraphs.

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