From the rhizome of Zingiber officinale L. (Zingiberaceae), four shogaols that protect IMR32 human neuroblastoma and normal human umbilical vein endothelial cells from beta-amyloid(25 - 35) insult at EC50 = 4.5 - 81 microM were isolated. The efficacy of cell protection from beta-amyloid(25 - 35) insult by these shogaols was shown to improve as the length of the side chain increases.
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Kim et al. (2002) studied this question.