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Updated: Jun 28, 2026

Two Flow Cytometric Approaches of NKG2D Ligand Surface Detection to Distinguish Stem Cells from Bulk Subpopulations in Acute Myeloid Leukemia
05:24

Two Flow Cytometric Approaches of NKG2D Ligand Surface Detection to Distinguish Stem Cells from Bulk Subpopulations in Acute Myeloid Leukemia

Published on: February 21, 2021

Cutting edge: Programmed death-1/programmed death ligand 1 interaction regulates the induction and maintenance of

Woo-Sung Chang1, Ji-Yeon Kim, Yeon-Jeong Kim

  • 1Laboratory of Immunology and Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea.

Journal of Immunology (Baltimore, Md. : 1950)
|November 5, 2008
PubMed

Invariant NKT (iNKT) cells are a distinct subset of T lymphocytes that recognize glycolipid Ags. Upon TCR stimulation, iNKT cells promptly secrete a wide range of cytokines and therefore have been investigated as a target for immunotherapy. However, after primary activation, iNKT cells become hyporesponsive toward their ligand (anergy). The further mechanism behind iNKT cell anergy is poorly understood. We found that a low level of programmed death-1 (PD-1) was constitutively expressed on iNKT cells and that PD-1 expression was increased after stimulation and lasted at least 2 mo. Moreover, not only did blocking of the PD-1/PD ligand 1 (PD-L1) pathway prevent the induction of anergy in iNKT cells, but anergic iNKT cells also recovered responsiveness and these "rescued" cells efficiently mediated antitumor immunity. Our findings suggest that the PD-1/PD-L1 interaction is essential for the induction and maintenance of iNKT cell anergy.

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