Blood Advances (Nov 2019)

CD56 as a marker of an ILC1-like population with NK cell properties that is functionally impaired in AML

  • Bérengère Salomé,
  • Alejandra Gomez-Cadena,
  • Romain Loyon,
  • Madeleine Suffiotti,
  • Valentina Salvestrini,
  • Tania Wyss,
  • Giulia Vanoni,
  • Dan Fu Ruan,
  • Marianna Rossi,
  • Alessandra Tozzo,
  • Paolo Tentorio,
  • Elena Bruni,
  • Carsten Riether,
  • Eva-Maria Jacobsen,
  • Peter Jandus,
  • Curdin Conrad,
  • Manfred Hoenig,
  • Ansgar Schulz,
  • Katarzyna Michaud,
  • Matteo Giovanni Della Porta,
  • Silvia Salvatore,
  • Ping-Chih Ho,
  • David Gfeller,
  • Adrian Ochsenbein,
  • Domenico Mavilio,
  • Antonio Curti,
  • Emanuela Marcenaro,
  • Alexander Steinle,
  • Amir Horowitz,
  • Pedro Romero,
  • Sara Trabanelli,
  • Camilla Jandus

Journal volume & issue
Vol. 3, no. 22
pp. 3674 – 3687

Abstract

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Abstract: An understanding of natural killer (NK) cell physiology in acute myeloid leukemia (AML) has led to the use of NK cell transfer in patients, demonstrating promising clinical results. However, AML is still characterized by a high relapse rate and poor overall survival. In addition to conventional NKs that can be considered the innate counterparts of CD8 T cells, another family of innate lymphocytes has been recently described with phenotypes and functions mirroring those of helper CD4 T cells. Here, in blood and tissues, we identified a CD56+ innate cell population harboring mixed transcriptional and phenotypic attributes of conventional helper innate lymphoid cells (ILCs) and lytic NK cells. These CD56+ ILC1-like cells possess strong cytotoxic capacities that are impaired in AML patients at diagnosis but are restored upon remission. Their cytotoxicity is KIR independent and relies on the expression of TRAIL, NKp30, NKp80, and NKG2A. However, the presence of leukemic blasts, HLA-E–positive cells, and/or transforming growth factor-β1 (TGF-β1) strongly affect their cytotoxic potential, at least partially by reducing the expression of cytotoxic-related molecules. Notably, CD56+ ILC1-like cells are also present in the NK cell preparations used in NK transfer–based clinical trials. Overall, we identified an NK cell–related CD56+ ILC population involved in tumor immunosurveillance in humans, and we propose that restoring their functions with anti-NKG2A antibodies and/or small molecules inhibiting TGF-β1 might represent a novel strategy for improving current immunotherapies.