bioRxiv preprint doi: https://doi.org/10.1101/2021.03.24.436901; this version posted March 25, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 CCR2 Regulates Vaccine-Induced Mucosal T-Cell Memory to Influenza A Virus 2 Woojong Lee1, Brock Kingstad-Bakke1, Ross M. Kedl2, Yoshihiro Kawaoka1, and, M. 3 Suresh1,3* 4 Affiliations: 5 1Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, 6 53706, WI, USA 7 2Department of Immunology and Microbiology, School of Medicine, University of 8 Colorado, Aurora, CO, USA 9 3 Lead Author 10 11 * To whom correspondence should be addressed:
[email protected] 12 13 Word Count for the abstract = 248 14 15 16 17 18 19 20 1 bioRxiv preprint doi: https://doi.org/10.1101/2021.03.24.436901; this version posted March 25, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 21 Abstract 22 Elicitation of lung tissue-resident memory CD8 T cells (TRMs) is a goal of T-cell based 23 vaccines against respiratory viral pathogens such as influenza A virus (IAV). Chemokine 24 receptor 2 (CCR2)-dependent monocyte trafficking plays an essential role in the 25 establishment of CD8 TRMs in lungs of IAV-infected mice. Here, we used a combination 26 adjuvant-based subunit vaccine strategy that evokes multifaceted (TC1/TC17/TH1/TH17) 27 IAV nucleoprotein-specific lung TRMs, to determine whether CCR2 and monocyte 28 infiltration are essential for vaccine-induced TRM development and protective immunity to 29 IAV in lungs.