Archives of Pharmacal Research

, Volume 35, Issue 6, pp 1115–1122 | Cite as

Neuroprotection of Ilex latifolia and caffeoylquinic acid derivatives against excitotoxic and hypoxic damage of cultured rat cortical neurons

  • Joo Youn Kim
  • Hong Kyu Lee
  • Bang Yeon Hwang
  • SeungHwan Kim
  • Jae Kuk Yoo
  • Yeon Hee Seong
Research Articles Drug Actions

Abstract

Ilex latifolia (Aquifoliaceae), one of the primary components of “Ku-ding-cha”, has been used in Chinese folk medicine to treat headaches and various inflammatory diseases. A previous study demonstrated that the ethanol extract of I. latifolia could protect against ischemic apoptotic brain damage in rats. The present study investigated the protective activity of I. latifolia against glutamate-induced neurotoxicity using cultured rat cortical neurons in order to explain a possible mechanism related to its inhibitory effect on ischemic brain damage and identified potentially active compounds from it. Exposure of cultured cortical neurons to 500 μM glutamate for 12 h triggered neuronal cell death. I. latifolia (10–100 μg/mL) inhibited glutamate-induced neuronal death, elevation of intracellular calcium ([Ca2+]i), generation of reactive oxygen species (ROS), the increase of a pro-apoptotic protein, BAX, and the decrease of an anti-apoptotic protein, BcL-2. Hypoxia-induced neuronal cell death was also inhibited by I. latifolia. 3,4-Dicaffeoylquinic acid (diCQA), 3,5-diCQA, and 3,5-diCQA methyl ester isolated from I. latifolia also inhibited the glutamate-induced increase in [Ca2+]i, generation of ROS, the change of apoptosis-related proteins, and neuronal cell death; and hypoxia-induced neuronal cell death. These results suggest that I. latifolia and its active compounds prevented glutamate-induced neuronal cell damage by inhibiting increase of [Ca2+]i, generation of ROS, and resultantly apoptotic pathway. In addition, the neuroprotective effects of I. latifolia on ischemia-induced brain damage might be associated with the anti-excitatory and anti-oxidative actions and could be attributable to these active compounds, CQAs.

Key words

Ilex latifolia Caffeoylquinic acids Cultured neurons Glutamate Excitotoxicity Hypoxia Neuroprotection 

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Copyright information

© The Pharmaceutical Society of Korea and Springer Netherlands 2012

Authors and Affiliations

  • Joo Youn Kim
    • 1
  • Hong Kyu Lee
    • 1
  • Bang Yeon Hwang
    • 2
  • SeungHwan Kim
    • 3
  • Jae Kuk Yoo
    • 4
  • Yeon Hee Seong
    • 1
  1. 1.College of Veterinary MedicineChungbuk National UniversityCheongjuKorea
  2. 2.College of PharmacyChungbuk National UniversityCheongjuKorea
  3. 3.College of Physical EducationKyunghee UniversityYounginKorea
  4. 4.Han Kook Shin YakNonsan, ChungnamKorea

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