- Vitamin E protected cultured cortical neurons from oxidative stress-induced cell death through the activation of mitogen-activated protein kinase and phosphatidylinositol 3-kinase. Numakawa, Y., Numakawa, T., Matsumoto, T., Yagasaki, Y., Kumamaru, E., Kunugi, H., Taguchi, T., Niki, E. J. Neurochem. (2006)