Cd127 fitc

Regulatory T cells (Treg) were defined as CD4⁺CD25⁺CD127^low/- cells. Other CD4⁺T subsets were identified by differential expression of CCR4, CXCR3, and CCR6 as previously reported (7 (link), 9 (link)): CXCR3⁺CCR4⁻CCR6⁻ (Th1), CXCR3⁻CCR4⁺CCR6⁻ (Th2), CXCR3⁻CCR4⁺CCR6⁺(Th17), and CXCR3⁺CCR4⁻CCR6⁺ (Th1Th17) (Figure 1). In addition, Th17 cells were defined as the summation of CXCR3⁻CCR4⁺CCR6⁺ (Th17) and CXCR3⁺CCR4⁻CCR6⁺(Th1Th17).
The fluorochrome-conjugated antibodies used for polychromatic flow cytometry analysis were CD3-BV510 (Biolegend, USA, catalog no. 317332), CD4-APC-Cy7 (Biolegend, USA, catalog no. 317418), CCR4-APC (Biolegend, USA, catalog no. 359404), CXCR3-PE (Biolegend, USA, catalog no. 353706), CCR6-PE-Cy7 (Biolegend, USA, catalog no. 353418), CD25-BV421 (Biolegend, USA, catalog no. 302630), CD127-FITC (Biolegend, USA, catalog no. 351312), PE-Cy7-CCR7 (Biolegend, USA, catalog no. 353226) and CD62L-FITC (Biolegend, USA, catalog no. 304804). A viability dye, 7-AAD (Becton Dickinson, USA, catalog no. 559925), was used to exclude dead cells. Isotype antibodies were also used as negative controls for every detection to set proper gating for the receptor expression. Cells were analyzed by fluorescence-activated cell sorting (FACS), using the BD LSRII cytometer and FlowJo software.

We isolated peripheral blood mononuclear cells (PBMC) from peripheral blood by Ficoll gradient and we stored them in liquid nitrogen for batched analysis. For multicolor flow cytometry analyses, we used the following monoclonal antibodies: from Becton Dickinson (BD, Franklin Lakes, NJ), CD3-FITC, CD3-PerCP-Cy5.5, CD4-APC-Cy7, CD8-BV510, CD45RO-FITC, CD45RA-APC, CD45RA-APC-Cy7, CD71-PE, IgD-PerCP-Cy5.5, CD25-APC-Cy7, CD138-BV421, CCR4-PE, CD27-PE, CD95-BV421, CD28-BV421, TIM3-BV421, CCR6-BV421, CCR7-AF700, CXCR3-PE, IL-2-PE, IL-17-BV786, and IFN-γ-PE-Cy7; from Biolegend (San Diego, CA), CD19-BV510, CD56-FITC, CD27-APC, CD127-FITC, CD57-PerCp-Cy5.5, PD-1-APC-Cy7, CXCR5-FITC, LAG3-APC, IL-10-PerCP-Cy5.5, and TNF-α-FITC. From eBioscience (San Diego, CA), CD4-PE-Cy7, CD21-PE, and CD24-APC-Cy7 were used. From Miltenyi Biotec (Auburn, CA), CD25-APC and anti-KLRG1-PE were used. From Beckman Coulter (Indianapolis, IN), CD38-PE-Cy7 was used.
We performed intracellular staining for IL-2, IL-4, IL-17, IFN-g, and TNF-a together with extracellular markers for CD4⁺, CD8⁺, and CD19⁺. Cells were fixed and permeabilized using Intracellular Fixation and Permeabilization Buffer Set (eBioscience) according to the manufacturer’s instructions.
Data were acquired (> 1 × 10⁶ events) on a 3-laser FACSLyric flow cytometer (BD Biosciences) and analyzed with FlowJo^® software.