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Role of polymyxin B (PB) on nitric oxide production in RAW264.7 macrophages treated with either LPS or β-glucan. RAW264.7 cells were pretreated with 50 µg/ml of PB for 30 min and then activated with either LPS (0.2 µg/ml) or β-glucan (300 µg/ml). Data represents the mean ± SD. *Significant difference (p < 0.05) compared to the control group, #Significant difference (p < 0.05) compared to the LPS group.
