For the suppressive assay, cryoconserved PBMCs were thawed and stained with Percp-Cy5.5–conjugated anti-human HLADR, FITC-conjugated anti-human CD33 (BD) and PE-conjugated anti-human IL4Rα (R&D Systems). For the cGMP and cAMP analysis, cryoconserved PBMCs from patients treated with “high” or “intermediate” dose of tadalafil, cells were labeled with: BV421-conjugated anti-human CD3 (e-Bioscience), FITC-conjugated anti-human CD33 (BD), PE-conjugated anti-human IL4Rα (R&D Systems), and brilliant violet 711–conjugated anti-human HLADR. Cells were sorted at the Diabetes Research Institute (DRI) flow cytometry core at the University of Miami, Miami, FL, using a BD-FACS-ARIA.
+ Open protocol