Research Article

Suppressive Effect of Hydroquinone, a Benzene Metabolite, on In Vitro Inflammatory Responses Mediated by Macrophages, Monocytes, and Lymphocytes

Figure 10

Effect of thiol-containing compounds on hydroquione-mediated inhibition of NO production and lymphocyte proliferation. (a) RAW264.7 cells ( ) were pretreated with L-cysteine (800  M) or DTT (100  M) and HQ (hydroquinone, 25  M) in the presence or absence of LPS (2.5  g/mL) for 24 hours. The level of NO was determined by Griess reagent as described in Section 2. (b) Bone marrow-derived cells were incubated with L-cysteine (800  M) or DTT (100  M) and hydroquinone (25  M) in the presence or absence of Con A (1  g/mL) for 24 hours. and represent significant difference as compared to control or HQ-treated group.
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