Fluid-phase uptake by Raji B cells induced by different treatments. B cells were infected with M. tuberculosis (MTB), M. smegmatis (MSM), and S. typhimurium (ST), or treated with phorbol 12-myristate 3-acetate (PMA), M. tuberculosis culture supernatant (MTB-SN), or M. smegmatis culture supernatant (MSM-SN). The fluorescent fluid-phase uptake was determined by the quantification of the relative fluorescence units (RFU) at several time points (15, 60, 90, 120, and 180 min). B cells that were not treated served as the control (CONTROL) for each treatment. The effect of several inhibitors on the fluid-phase uptake was also monitored. Each of the inhibitors (cytochalasin (CD), wortmannin (WORT), and amiloride (AMIL) was individually added to the following treatments/infections: a) PMA treatment, b) ST, c) MTB, d) MTB-SN, e) MSM, f) MSM-SN. Each bar represents the mean of four different measurements. There were statistically significant differences (p <0.01) when the infected, PMA-treated and SN-treated B cells were compared with i) the control cells, ii) the infected cells in the presence of the inhibitors, and iii) the PMA-treated or SN-treated cells in the presence of the inhibitors. The experiment presented is representative of three independent repetitions.