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Journal of Natural Medicines

, Volume 66, Issue 3, pp 544–551 | Cite as

Neuroprotective properties of Loranthus parasiticus aqueous fraction against oxidative stress-induced damage in NG108-15 cells

  • Daniel Zin Hua Wong
  • Habsah Abdul KadirEmail author
  • Choy Long Lee
  • Bey Hing Goh
Original Paper

Abstract

Loranthus parasiticus, a Chinese folk medicine, has been widely used for the treatment of brain diseases, particularly in southwest China. Hence, the present neuroprotection model was designed to investigate its neuroprotective properties against H2O2-induced oxidative stress in NG108-15 cells. L. parasiticus aqueous fraction (LPAF), which was selected in the present study, had proved to be the most active fraction among the other tested extracts and fractions in our previous screening. The restoration of depleted intracellular glutathione (GSH), a major endogenous antioxidant, by LPAF was observed after H2O2 insult. Pretreatment with LPAF substantially reduced the production of intracellular reactive oxygen species generated from H2O2. Apoptotic features such as externalization of phosphatidylserine and disruption of mitochondrial membrane potential were significantly attenuated by LPAF. In addition, cell cycle analysis revealed a prominent decrease in the H2O2-induced sub-G1 population by LPAF. Moreover, apoptotic morphological analysis by DAPI nuclear staining demonstrated that NG108-15 cells treated with H2O2 exhibited apoptotic features, while such changes were greatly reduced in cells pretreated with LPAF. Taken together, these findings confirmed that LPAF exerts marked neuroprotective activity, which raises the possibility of potential therapeutic application of LPAF for managing oxidative stress-related neurological disorders and supports the traditional use of L. parasiticus in treating brain-related diseases.

Keywords

Apoptosis H2O2 Loranthus parasiticus Neuroprotection Oxidative stress 

Notes

Acknowledgments

We would like to thank University of Malaya for the research funding through Institute of Research and Consultancy (PS238-2008C) and Fundamental Research Grant Scheme (FP009/2010A). We thank Dr. Lee Hong Boon from Cancer Research Initiatives Foundation (CARIF), Sime Darby Medical Centre, Subang Jaya, Selangor, Malaysia for the use of the flow cytometer.

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Copyright information

© The Japanese Society of Pharmacognosy and Springer 2012

Authors and Affiliations

  • Daniel Zin Hua Wong
    • 1
  • Habsah Abdul Kadir
    • 1
    Email author
  • Choy Long Lee
    • 1
  • Bey Hing Goh
    • 1
  1. 1.Biomolecular Research Group, Biochemistry Program, Institute of Biological Sciences, Faculty of ScienceUniversity of MalayaKuala LumpurMalaysia

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