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Effects and molecular mechanisms of Noemyeong-san, a novel herbal prescription for treating Alzheimer's disease on microglia

미세아교세포에서 알츠하이머형 치매 치료 처방인 뇌명산(腦明散)의 효능 및 기전연구

  • Han, Sangtae ((Brain) Donguibogam Korean Medicine) ;
  • Jeong, Ji-Cheon (Department of Korean Internal Medicine, College of Korean Medicine, Dongguk University)
  • 한상태 ((브레인)동의보감한의원) ;
  • 정지천 (동국대학교 한의과대학 내과학교실)
  • Received : 2017.11.08
  • Accepted : 2017.11.21
  • Published : 2017.11.30

Abstract

Objectives : Noemyeong-san (NMS) is a novel herbal prescription composed of five oriental medicinal herbs including Prunellae Spica, Betulae Cortex, Foeniculi Fructus, Asiasari Radix, and Clematidis Radix for treating Alzheimer's disease. In the present study, we investigated the effects and molecular mechanisms of NMS on BV2 microglia to evaluate the potential action of this formula for preventing or treating neurodegenerative disease such as Alzheimer's disease. Methods : To determine the cytotoxicity of NMS on BV2 microglia, the MTT assay was performed. The effects of NMS on lipopolysaccharide (LPS)-stimulated BV2 microglia were determined with a nitric oxide (NO) assay and western blots for inflammatory mediator-related proteins, mitogen activated protein kinases (MAPKs), nuclear factor kappa B (NF-${\kappa}B$) pathway-related proteins, and heme oxygenase-1 (HO-1). Result : NMS inhibited induction of iNOS and COX-2 as well as NO production without affecting the cell viability in LPS-stimulated BV2 microglia. NMS also suppressed activation of ERK and p38 MAPK among main kinases of MAPKs as well as NF-${\kappa}B$ by LPS stimulation. Furthermore, NMS dose-dependently induced the expression of HO-1 and the inhibitory effect of NMS on the production of NO were blocked by pretreatment with an HO-1 inhibitor, Snpp. Conclusions : These results demonstrate that NMS has potent anti-neuroinflammatory effect on the LPS-stimulated microglia. These findings provide evidences for NMS to be considered as a new prescription for preventing or treating neurodegenerative disease such as Alzheimer's disease.

Keywords

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