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Food Chem Toxicol. 2013 Sep;59:643-9. doi: 10.1016/j.fct.2013.07.011. Epub 2013 Jul 16.

Octaphlorethol A, a novel phenolic compound isolated from Ishige foliacea, protects against streptozotocin-induced pancreatic β cell damage by reducing oxidative stress and apoptosis.

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Division of Food Bioscience, Konkuk University, Chungju Chungbuk 380-701, Republic of Korea.


Pancreatic β cells are extremely sensitive to oxidative stress, which probably has an important role in β cell damage in diabetes. The protective effect of octaphlorethol A (OPA), a novel phenolic compound isolated from Ishige foliacea, against streptozotocin (STZ)-induced pancreatic β cell damage was investigated using a rat insulinoma cell line (RINm5F pancreatic β cells). Pretreatment with OPA decreased the death of STZ-treated pancreatic β cells at concentrations of 12.5 μg/ml or 50 μg/ml, and reduced the generation of thiobarbituric acid reactive substances and intracellular reactive oxygen species in a dose-dependent manner in STZ-treated pancreatic β cells. In addition, the OPA pretreatment increased the activities of antioxidant enzymes such as catalase, superoxide dismutase, and glutathione peroxidase in STZ-treated pancreatic β cells. Moreover, OPA treatment elevated the level of insulin, which was reduced by STZ treatment, and protected pancreatic β cells against damage under STZ-treated conditions. These effects were mediated by suppressing apoptosis and were associated with increased anti-apoptotic Bcl-xL expression and reduced pro-apoptotic Bax and cleaved caspase-3 expression. These findings indicate that OPA may be useful as a potential pharmaceutical agent to protect against pancreatic β cell damage caused by oxidative stress associated with diabetes.


Apoptosis; Octaphlorethol A; Oxidative stress; Pancreatic β cells; Protective effect

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