Title |
YY-1224, a terpene trilactone-strengthened Ginkgo biloba, attenuates neurodegenerative changes induced by β-amyloid (1-42) or double transgenic overexpression of APP and PS1 via inhibition of cyclooxygenase-2
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Published in |
Journal of Neuroinflammation, April 2017
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DOI | 10.1186/s12974-017-0866-x |
Pubmed ID | |
Authors |
Zheng-Yi Li, Yoon Hee Chung, Eun-Joo Shin, Duy-Khanh Dang, Ji Hoon Jeong, Sung Kwon Ko, Seung-Yeol Nah, Tae Gon Baik, Jin Hyeong Jhoo, Wei-Yi Ong, Toshitaka Nabeshima, Hyoung-Chun Kim |
Abstract |
Ginkgo biloba has been reported to possess free radical-scavenging antioxidant activity and anti-inflammatory properties. In our pilot study, YY-1224, a terpene trilactone-strengthened extract of G. biloba, showed anti-inflammatory, neurotrophic, and antioxidant effects. We investigated the pharmacological potential of YY-1224 in β-amyloid (Aβ) (1-42)-induced memory impairment using cyclooxygenase-2 (COX-2) knockout (-/-) and APPswe/PS1dE9 transgenic (APP/PS1 Tg) mice. Repeated treatment with YY-1224 significantly attenuated Aβ (1-42)-induced memory impairment in COX-2 (+/+) mice, but not in COX-2 (-/-) mice. YY-1224 significantly attenuated Aβ (1-42)-induced upregulation of platelet-activating factor (PAF) receptor gene expression, reactive oxygen species, and pro-inflammatory factors. In addition, YY-1224 significantly inhibited Aβ (1-42)-induced downregulation of PAF-acetylhydrolase-1 (PAF-AH-1) and peroxisome proliferator-activated receptor γ (PPARγ) gene expression. These changes were more pronounced in COX-2 (+/+) mice than in COX-2 (-/-) mice. YY-1224 significantly attenuated learning impairment, Aβ deposition, and pro-inflammatory microglial activation in APP/PS1 Tg mice, whereas it significantly enhanced PAF-AH and PPARγ expression. A preferential COX-2 inhibitor, meloxicam, did not affect the pharmacological activity by YY-1224, suggesting that the COX-2 gene is a critical mediator of the neuroprotective effects of YY-1224. The protective activity of YY-1224 appeared to be more efficacious than a standard G. biloba extract (Gb) against Aβ insult. Our results suggest that the protective effects of YY-1224 against Aβ toxicity may be associated with its PAF antagonistic- and PPARγ agonistic-potential as well as inhibition of the Aβ-mediated pro-inflammatory switch of microglia phenotypes through suppression of COX-2 expression. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 41 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 8 | 20% |
Other | 5 | 12% |
Researcher | 5 | 12% |
Student > Bachelor | 3 | 7% |
Student > Master | 3 | 7% |
Other | 4 | 10% |
Unknown | 13 | 32% |
Readers by discipline | Count | As % |
---|---|---|
Neuroscience | 7 | 17% |
Agricultural and Biological Sciences | 5 | 12% |
Biochemistry, Genetics and Molecular Biology | 4 | 10% |
Psychology | 2 | 5% |
Medicine and Dentistry | 2 | 5% |
Other | 4 | 10% |
Unknown | 17 | 41% |