Figure 4. HMGB1 confers chemoresistance via TLR4 and RAGE.
(A) DU145 tumor cells, untreated or pretreated with control IgG, anti-TLR4, anti-RAGE, or both antibodies for 30 min, were exposed to recombinant HMGB1 for 24 h. Then, DTX was added for another 48 h prior to staining with methylene blue for visualization of live tumor cells. (B) The same experiment was conducted with recombinant HMGB1 substituted for supernatants from DTX-treated tumor cells. (C) DU145 tumor cells pretreated with recombinant HMGB1 were transfected with antisense-scramble or antisense-clusterin for 24 h, and then cells were cultured in medium with or without DTX for another 48 h prior to staining with methylene blue.