Non-classical HLA-E restricted CMV 15-mer peptides are recognized by adaptive NK cells and induce memory responses.

Autor:	Martín Almazán N; Department of Laboratory Medicine, Division of Pathology, Karolinska Institute, Stockholm, Sweden., Sala BM; Science for Life Laboratory, Department of Medicine, Karolinska Institute, Stockholm, Sweden.; Division of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden., Sandalova T; Science for Life Laboratory, Department of Medicine, Karolinska Institute, Stockholm, Sweden.; Division of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden., Sun Y; Department of Laboratory Medicine, Division of Pathology, Karolinska Institute, Stockholm, Sweden., Resink T; Science for Life Laboratory, Department of Medicine, Karolinska Institute, Stockholm, Sweden.; Division of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden., Cichocki F; Division of Hematology, Oncology and Transplantation, University of Minnesota Masonic Cancer Center, Minneapolis, MN, United States., Söderberg-Nauclér C; Department of Medicine, Microbial Pathogenesis Unit, Karolinska Institute, Stockholm, Sweden.; Division of Neurology, Karolinska University Hospital, Stockholm, Sweden.; Institute of Biomedicine, Unit for Infection and immunology, MediCity Research Laboratory, InFLAMES Flagship, University of Turku, Turku, Finland., Miller JS; Division of Hematology, Oncology and Transplantation, University of Minnesota Masonic Cancer Center, Minneapolis, MN, United States., Achour A; Science for Life Laboratory, Department of Medicine, Karolinska Institute, Stockholm, Sweden.; Division of Infectious Diseases, Karolinska University Hospital, Stockholm, Sweden., Sarhan D; Department of Laboratory Medicine, Division of Pathology, Karolinska Institute, Stockholm, Sweden.
Jazyk:	angličtina
Zdroj:	Frontiers in immunology [Front Immunol] 2023 Sep 21; Vol. 14, pp. 1230718. Date of Electronic Publication: 2023 Sep 21 (Print Publication: 2023).
DOI:	10.3389/fimmu.2023.1230718
Abstrakt:	Introduction: Human cytomegalovirus (HCMV) reactivation causes complications in immunocompromised patients after hematopoietic stem cell transplantation (HSCT), significantly increasing morbidity and mortality. Adaptive Natural Killer (aNK) cells undergo a persistent reconfiguration in response to HCMV reactivation; however, the exact role of aNK cell memory in HCMV surveillance remains elusive. Methods: We employed mass spectrometry and computational prediction approaches to identify HLA-E-restricted HCMV peptides that can elucidate aNK cell responses. We also used the K562 cell line transfected with HLA-E0*0103 for specific peptide binding and blocking assays. Subsequently, NK cells were cocultured with dendritic cells (DCs) loaded with each of the identified peptides to examine aNK and conventional (c)NK cell responses. Results: Here, we discovered three unconventional HLA-E-restricted 15-mer peptides (SEVENVSVNVHNPTG, TSGSDSDEELVTTER, and DSDEELVTTERKTPR) derived from the HCMV pp65-protein that elicit aNK cell memory responses restricted to HCMV. aNK cells displayed memory responses towards HMCV-infected cells and HCMV-seropositive individuals when primed by DCs loaded with each of these peptides and predicted 9-mer versions. Blocking the interaction between HLA-E and the activation NKG2C receptor but not the inhibitory NKG2A receptor abolished these specific recall responses. Interestingly, compared to the HLA-E complex with the leader peptide VMAPRTLIL, HLA-E complexes formed with each of the three identified peptides significantly changed the surface electrostatic potential to highly negative. Furthermore, these peptides do not comprise the classical HLA-E-restriction motifs. Discussion: These findings suggest a differential binding to NKG2C compared to HLA-E complexes with classical leader peptides that may result in the specific activation of aNK cells. We then designed six nonameric peptides based on the three discovered peptides that could elicit aNK cell memory responses to HCMV necessary for therapeutic inventions. The results provide novel insights into HLA-E-mediated signaling networks that mediate aNK cell recall responses and maximize their reactivity. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Martín Almazán, Sala, Sandalova, Sun, Resink, Cichocki, Söderberg-Nauclér, Miller, Achour and Sarhan.)
Databáze:	MEDLINE
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