Immunogenicity and therapeutic targeting of a public neoantigen derived from mutated PIK3CA.
Journal
Nature medicine
ISSN: 1546-170X
Titre abrégé: Nat Med
Pays: United States
ID NLM: 9502015
Informations de publication
Date de publication:
05 2022
05 2022
Historique:
received:
02
04
2021
accepted:
16
03
2022
pubmed:
29
4
2022
medline:
21
5
2022
entrez:
28
4
2022
Statut:
ppublish
Résumé
Public neoantigens (NeoAgs) represent an elite class of shared cancer-specific epitopes derived from recurrently mutated driver genes. Here we describe a high-throughput platform combining single-cell transcriptomic and T cell receptor (TCR) sequencing to establish whether mutant PIK3CA, among the most frequently genomically altered driver oncogenes, generates an immunogenic public NeoAg. Using this strategy, we developed a panel of TCRs that recognize an endogenously processed neopeptide encompassing a common PIK3CA hotspot mutation restricted by the prevalent human leukocyte antigen (HLA)-A*03:01 allele. Mechanistically, immunogenicity to this public NeoAg arises from enhanced neopeptide/HLA complex stability caused by a preferred HLA anchor substitution. Structural studies indicated that the HLA-bound neopeptide presents a comparatively 'featureless' surface dominated by the peptide's backbone. To bind this epitope with high specificity and affinity, we discovered that a lead TCR clinical candidate engages the neopeptide through an extended interface facilitated by an unusually long CDR3β loop. In patients with diverse malignancies, we observed NeoAg clonal conservation and spontaneous immunogenicity to the neoepitope. Finally, adoptive transfer of TCR-engineered T cells led to tumor regression in vivo in mice bearing PIK3CA-mutant tumors but not wild-type PIK3CA tumors. Together, these findings establish the immunogenicity and therapeutic potential of a mutant PIK3CA-derived public NeoAg.
Identifiants
pubmed: 35484264
doi: 10.1038/s41591-022-01786-3
pii: 10.1038/s41591-022-01786-3
pmc: PMC9117146
doi:
Substances chimiques
Antigens, Neoplasm
0
Receptors, Antigen, T-Cell
0
Class I Phosphatidylinositol 3-Kinases
EC 2.7.1.137
PIK3CA protein, human
EC 2.7.1.137
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
946-957Subventions
Organisme : NCI NIH HHS
ID : R35 CA241894
Pays : United States
Organisme : NCRR NIH HHS
ID : S10 RR028976
Pays : United States
Organisme : NCRR NIH HHS
ID : S10 RR025528
Pays : United States
Organisme : NIAID NIH HHS
ID : R01 AI129543
Pays : United States
Organisme : NCI NIH HHS
ID : R37 CA259177
Pays : United States
Organisme : NCI NIH HHS
ID : P30 CA008748
Pays : United States
Organisme : NIH HHS
ID : S10 OD021527
Pays : United States
Organisme : NCI NIH HHS
ID : P50 CA217694
Pays : United States
Organisme : NIGMS NIH HHS
ID : P30 GM124165
Pays : United States
Informations de copyright
© 2022. The Author(s).
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