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Deciphering the immunopeptidome in vivo reveals new tumour antigens
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Journal Article
Deciphering the immunopeptidome in vivo reveals new tumour antigens
2022
Overview
Immunosurveillance of cancer requires the presentation of peptide antigens on major histocompatibility complex class I (MHC-I) molecules
1
–
5
. Current approaches to profiling of MHC-I-associated peptides, collectively known as the immunopeptidome, are limited to in vitro investigation or bulk tumour lysates, which limits our understanding of cancer-specific patterns of antigen presentation in vivo
6
. To overcome these limitations, we engineered an inducible affinity tag into the mouse MHC-I gene (
H2-K1
) and targeted this allele to the
Kras
LSL-G12D/+
Trp53
fl/fl
mouse model (KP/K
b
Strep)
7
. This approach enabled us to precisely isolate MHC-I peptides from autochthonous pancreatic ductal adenocarcinoma and from lung adenocarcinoma (LUAD) in vivo. In addition, we profiled the LUAD immunopeptidome from the alveolar type 2 cell of origin up to late-stage disease. Differential peptide presentation in LUAD was not predictable by mRNA expression or translation efficiency and is probably driven by post-translational mechanisms. Vaccination with peptides presented by LUAD in vivo induced CD8
+
T cell responses in naive mice and tumour-bearing mice. Many peptides specific to LUAD, including immunogenic peptides, exhibited minimal expression of the cognate mRNA, which prompts the reconsideration of antigen prediction pipelines that triage peptides according to transcript abundance
8
. Beyond cancer, the
K
b
Strep
allele is compatible with other Cre-driver lines to explore antigen presentation in vivo in the pursuit of understanding basic immunology, infectious disease and autoimmunity.
A newly developed genetically engineered mouse model enables the analysis of specific antigen presentation in vivo, providing insights into the tumour immunopeptidome and cancer progression.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 38
/ 38/39
/ 42/41
/ 64/60
/ 82/58
/ 82/83
/ Alleles
/ Alveolar Epithelial Cells - immunology
/ Alveoli
/ Animals
/ Antigens
/ Antigens, Neoplasm - analysis
/ Antigens, Neoplasm - chemistry
/ Antigens, Neoplasm - immunology
/ Cancer
/ Carcinoma, Pancreatic Ductal - chemistry
/ Carcinoma, Pancreatic Ductal - immunology
/ CD8-Positive T-Lymphocytes - cytology
/ CD8-Positive T-Lymphocytes - immunology
/ Histocompatibility Antigens Class I - genetics
/ Histocompatibility Antigens Class I - immunology
/ Humanities and Social Sciences
/ Lysates
/ Major histocompatibility complex
/ Mice
/ Pancreas
/ Pancreatic Neoplasms - chemistry
/ Pancreatic Neoplasms - immunology
/ Peptides
/ Science
/ Tumors
