fig1

Figure 1. Effect of pentoxifylline on the expression levels of P-gp, determined by Western Blot, on (A) NCI-H460 vs. NCI-H460/R and (B) A549 vs. A549-CDR2 cell lines, treated with vehicle (H₂O) or pentoxifylline at 1.0 mM after 48 h. β-Actin was used as a loading control. Data are presented as a percentage of expression. ^*P ≤ 0.05;^***P < 0.001. P-gp: P-glycoprotein.