Citrullinated ENO1 Vaccine Enhances PD-1 Blockade in Mice Implanted with Murine Triple-Negative Breast Cancer Cells

Citrullinated ENO1 Vaccine Enhances PD-1 Blockade in Mice Implanted with Murine Triple-Negative Breast Cancer Cells

<b>Background/Objectives</b>:Cancer vaccine targets mostly include mutations and overexpressed proteins. However, cancer-associated post-translational modifications (PTMs) may also induce immune responses. Previously, our group established the enzyme protein arginine deiminase type-2 (PA...

Full description

Saved in:
Bibliographic Details
Main Authors: Ricardo A. León-Letelier, Alejandro M. Sevillano-Mantas, Yihui Chen, Soyoung Park, Jody Vykoukal, Johannes F. Fahrmann, Edwin J. Ostrin, Candace Garrett, Rongzhang Dou, Yining Cai, Fu-Chung Hsiao, Jennifer B. Dennison, Eduardo Vilar, Banu K. Arun, Samir Hanash, Hiroyuki Katayama
Format: Article
Language:English
Published: MDPI AG 2025-06-01
Series:Vaccines
Subjects:
cancer vaccine
post-translational modification
immunopeptidome
triple-negative breast cancer
PD-1 blockade
Online Access:https://www.mdpi.com/2076-393X/13/6/629
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:<b>Background/Objectives</b>:Cancer vaccine targets mostly include mutations and overexpressed proteins. However, cancer-associated post-translational modifications (PTMs) may also induce immune responses. Previously, our group established the enzyme protein arginine deiminase type-2 (PADI2), which catalyzes citrullination modification, is highly expressed in triple-negative breast cancer (TNBC), promoting antigenicity. <b>Methods</b>: Here, we show the workflow of designing citrullinated enolase 1 (citENO1) vaccine peptides identified from breast cancer cells by mass spectrometry and demonstrate TNBC vaccine efficacy in the mouse model. Immunized mice with citENO1 peptides or the corresponding unmodified peptides, plus Poly I:C as an adjuvant, were orthotopically implanted with a TNBC murine cell line. <b>Results</b>: Vaccination with citENO1, but not unmodified ENO1 (umENO1), induced a greater percentage of activated CD8+ PD-1+ T cells and effector memory T cells in skin-draining lymph nodes (SDLNs). Remarkably, the citENO1 vaccine delayed tumor growth and prolonged overall survival, which was further enhanced by PD-1 blockade. <b>Conclusions</b>: Our data suggest that cancer-restricted post-translational modifications provide a source of vaccines that induce an anti-cancer immune response.
ISSN:2076-393X

Similar Items