OMLP-PCs exert their antimicrobial actions via bacteriostatic mechanisms. LIVE/DEAD staining of E. faecalis
(A), S. pyogenes
(B), P. aeruginosa
(C), and P. mirabilis
(D) cultures after incubation with OMLP-PC conditioned media with or without bacterial exposure, recombinant human OPG and haptoglobin. No bactericidal effect was seen with any of the test conditions. Data are expressed as the percentage of live/dead cells ± SEM. Black bars indicate the percentage of live cells; and checkered bars, the percentage of dead cells. Abbreviations: EFs, enriched fibroblasts; IFN-γ, interferon-γ; OMLP-PCs, oral mucosal lamina propria-progenitor cells; OPG, osteoprotegerin.