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Nordihydroguaiaretic acid (NDGA) is a natural lignan with recognized antioxidant and beneficial properties that is isolated from  Larrea tridentata . In this study, we evaluated the effect of NDGA on the downregulation of oxidant stress-induced CD33 in human monocytes (MNs). Oxidative stress was induced by iodoacetate (IAA) or hydrogen peroxide (H 2 O 2 ) and was evaluated using reactive oxygen species (ROS) production, and cell viability. NDGA attenuates toxicity, ROS production and the oxidative stress-induced decrease of CD33 expression secondary to IAA or H 2 O 2  in human MNs. It was also shown that NDGA (20   μ  M) attenuates cell death in the THP-1 cell line that is caused by treatment with either IAA or H 2 O 2 . These results suggest that NDGA has a protective effect on CD33 expression, which is associated with its antioxidant activity in human MNs.

Nordihydroguaiaretic Acid Attenuates the Oxidative Stress-Induced Decrease of CD33 Expression in Human Monocytes