Korean J Physiol Pharmacol.  2010 Oct;14(5):279-283. 10.4196/kjpp.2010.14.5.279.

Bark Constituents from Mushroom-detoxified Rhus verniciflua Suppress Kainic Acid-induced Neuronal Cell Death in Mouse Hippocampus

Affiliations
  • 1Department of Pharmacology, College of Medicine, Kangwon National University, Chuncheon 200-701, Korea. wchun@kangwon.ac.kr
  • 2College of Pharmacy, Kangwon National University, Chuncheon 200-701, Korea.
  • 3Division of Bio-resources Technology, Kangwon National University, Chuncheon 200-701, Korea. kimmjo@kangwon.ac.kr
  • 4Department of Radiology, Ilsan Paik Hospital, Inje University, School of Medicine, Goyang 411-706, Korea.

Abstract

Urushinol, a plant allergen, has significantly restricted the medical application of Rhus verniciflua, although it has been reported to possess a wide variety of biological activities such as anti-inflammatory, antioxidant, and anti-cancer actions. To reduce the urushinol content while maintaining the beneficial biological activities, mushroom-mediated fermentation of Rhus verniciflua was carried out and this method resulted in significantly attenuated allergenicity [1]. In the present study, to examine the neuroprotective properties of mushroom-fermented stem bark of Rhus verniciflua, two constituents were isolated from mushroom-fermented bark and their neuroprotective properties were examined in a mouse model of kainic acid (KA)-induced excitotoxicity. KA resulted in significant apoptotic neuronal cell death in the CA3 region of mouse hippocampus. However, seven daily administrations of RVH-1 or RVH-2 prior to KA injection significantly attenuated KA-induced pyramidal neuronal cell death in the CA3 region. Furthermore, pretreatment with RVH-1 and RVH-2 also suppressed KA-induced microglial activation in the mouse hippocampus. The present study demonstrates that RVH-1 and RVH-2 isolated from Rhus verniciflua and detoxified using mushroom species possess neuroprotective properties against KA-induced excitotoxicity. This leads to the possibility that detoxified Rhus verniciflua can be a valuable asset in herbal medicine.

Keyword

Kainic acid; Neuroprotection; Stigma-4-en-3-one; Stigma-4-en-3,6-dione
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