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KMID : 0043320100330040531
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Archives of Pharmacal Research
2010 Volume.33 No. 4 p.531 ~ p.538
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Syringin from Stem Bark of Fraxinus rhynchophylla Protects Aβ(25-35)- induced Toxicity in Neuronal Cells
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Song Kyung-Sik
Yang Eun-Ju
Kim Sang-In
Ku Hyun-Yeong
Lee Dong-Seok
Lee Jong-Won
Kim Yae-Sil
Seong Yeon-Hee
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Abstract
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The medicinal herb Jinpi, derived from the dried stem barks of Fraxinus rhynchophylla belonging to Oleaceae is widely used as a variety of Korean folk remedies for anti-inflammatory, febricide, antidiarrhea, and antileukorrhea diseases. In the course of screening antidementia agents from natural products, F. rhynchophylla showed significant inhibitory activity toward Aβ(25-35)-induced neuronal cell death. An active principle was isolated and identified as syringin. When the neuroblastoma cells were exposed to 50 μM Aβ(25-35), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) reduction rate (survival rate) decreased to 60.21 ± 2.16% over control while syringin treated ones recovered cell viability up to 79.12 ± 1.39% at 20 μM. In addition, 20 μM syringin almost completely removed Aβ(25-35)-induced reactive oxygen species. The neuroprotective effect of syringin seemed to be originated from the reduction of apoptosis since decrease in caspase-3 activity and expression, reduction in cleaved PARP, and DNA fragmentation were observed. These results suggest that F. rhynchophylla and syringin are expected to be useful for preventing Aβ(25-35)-induced neuronal cell damage.
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KEYWORD
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Alzheimer’s disease, Fraxinus rhynchphylla, Syringin, β-Amyloid fibrils, Apoptosis
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