2012 Volume 35 Issue 1 Pages 121-126
Glucose toxicity contributes to progressive β-cell failure and the development of overt diabetes. Oxidative stress is an important aspect of glucose toxicity in pancreatic β-cells. We investigated whether the flavonoid apigenin protects pancreatic β-cells from 2-deoxy-D-ribose (dRib)-induced oxidative cell damage. HIT-T15 pancreatic β-cells were cultured with or without apigenin in the presence of dRib. Time- and dose-dependent cell viability was monitored using a cell counting kit (CCK-8), while the induction of apoptosis was analyzed using a cell death enzyme-linked immunosorbent assay (ELISA) kit. Mitochondrial membrane potential (ΔΨm) was determined using the JC-1 kit. Intracellular oxidative stress was measured by fluorometric analysis of DCFH oxidation using 2′,7′-dichlorofluorescin diacetate (DCFH-DA) as the probe. In addition, the DNA binding activity of the oxidative stress-related transcriptional factors nuclear factor-κB (NF-κB) and activator protein 1 (AP-1) were analyzed. dRib reduced cell survival and ΔΨm, while it markedly increased intracellular levels of reactive oxygen species (ROS), apoptosis, and the activity of the oxidative stress-related transcription factors NF-κB and AP-1. However, pretreatment of cells with apigenin attenuated all the dRib-induced effects. The anti-oxidants, N-acetyl-L-cysteine (NAC) and alpha lipoic acid (ALA), also prevented both dRib–induced oxidative damage and activation of NF-κB and AP-1. Taken together, these results suggest that apigenin attenuates dRib-induced cell damage in pancreatic β-cells via oxidative stress-related signaling.
