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Blockade of NA- and β-HB–induced suppression of IL-6 production by PTX. ELISA analysis of IL-6 production in ARPE-19 cells treated with PTX (100 ng/mL) before exposure to TNF-α (10 ng/mL) and/or NA (1 mM), β-HB (5 mM). *P < 0.01 compared with control cells; **P < 0.01 compared with TNF-α–treated cells; NS, not significantly different from cells treated with TNF-α alone.
