Gating strategy for flow cytometry and comparison between fresh and cryopreserved monocyte surface marker expression.

<p>(A) Shown are isotype control dot plots and CD14 and CD16 expression in freshly obtained and cryopreserved PBMC from the same healthy volunteer and the expression of CX3CR1 on each monocyte subset in the cryopreserved sample. Monocyte subsets were gated using the isotype staining as a guide, as seen in the farthest left panel. Traditional monocytes are in purple, inflammatory monocytes are in pink, patrolling monocytes are in green. Gates are drawn based on negative isotype staining using Rat IgG2b, in the case of CX3CR1. (B) Summary surface marker expression, both proportion and MFI, in fresh and cryopreserved PBMCs on total monocytes of healthy control subjects, with medians, are shown. Each shape (triangle, square, diamond, and circle) represents an individual healthy control subject. (C) Summary surface marker expression, both proportion and MFI, in fresh and cryopreserved PBMCs on total monocytes of virologically suppressed HIV-infected subjects, with medians, are shown. Each shape (triangle, square, diamond, and circle) represents an individual HIV-infected subject.