BAL and mLN cells were processed and stained for flow cytometry as previously described [19] (link), [21] (link) with the following antibodies: CD16/32 (Fc blocker), CD4 (FITC), CD25 (PE-Cy7), and Foxp3 (APC) from eBioscience (San Diego, CA); CD3 (APC/Cy7) and CD8 (PerCP) from BioLegend (San Diego, CA). The MHC class I tetramer (PE) specific for H-2Db-resricted epitope of the influenza nucleoprotein (NP, DbNP366-74) of PR/8 was obtained from the NIH Tetramer Core Facility (Atlanta, GA). Stained cells were subsequently analyzed on a CyAn ADP Analyzer flow cytometer (Beckman Coulter, Inc., Fullerton, CA), and all flow cytometry data were analyzed via FlowJo Software (TreeStar, Ashland, OR). All flow cytometry analysis of T cells consisted of a doublet exclusion gate followed by gating of CD3+ cells for further analysis of CD4+ and CD8+ T cell populations.
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