Abstract
Rationale
In Alzheimer’s disease (AD), the deposition of amyloid peptides is invariably associated with oxidative stress and inflammatory responses. Xanthoceraside has anti-inflammatory and antioxidative activities. However, it remains unclear whether xanthoceraside improves amyloid β (Aβ)-induced neurotoxicity.
Objectives
The purpose of this study was to examine the effect of xanthoceraside on behavioral impairments, inflammatory responses, and oxidative stress induced by Aβ peptide25–35 (Aβ25–35) in mice.
Materials and methods
The mice were treated orally with xanthoceraside (0.02, 0.08, or 0.32 mg/kg, once daily) after the intracerebroventricular injection of Aβ25–35 (day 0). Cognitive functions were evaluated in Y-maze (day 6) and novel object recognition tests (days 7 and 8). Inducible nitric oxide synthase (iNOS) and nitrotyrosine levels in the hippocampus were examined (day 9). The mRNA expressions of iNOS and interleukin-4 (IL-4) in the hippocampus were measured 2 h and 3 days after the Aβ25–35 injection by real-time reverse transcription-polymerase chain reaction.
Results
Xanthoceraside significantly attenuated behavioral impairments induced by Aβ25–35 in the Y-maze and novel object recognition tests. Repeated treatment with xanthoceraside significantly inhibited the increase in the expression of iNOS and nitrotyrosine in the hippocampus induced by Aβ25–35, which is associated with an enhanced expression of the IL-4 mRNA.
Conclusions
These findings suggest that xanthoceraside attenuates memory impairments through amelioration of oxidative stress and inflammatory responses induced by Aβ25–35 and is a potential candidate for an AD treatment.
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Abbreviations
- Aβ:
-
Amyloid β
- Aβ25–35 :
-
Amyloid β peptide25–35
- Aβ35–25 :
-
Amyloid β peptide35–25
- AD:
-
Alzheimer’s disease
- Ct:
-
Threshold cycles
- i.c.v.:
-
Intracerebroventricularly
- IL-1β:
-
Interleukin-1β
- IL-4:
-
Interleukin-4
- iNOS:
-
Inducible nitric oxide synthase
- LTP:
-
Long-term potentiation
- NO:
-
Nitric oxide
- p.o.:
-
Per os
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- SDS:
-
Sodium dodecyl sulfate
- TNF-α:
-
Tumor necrosis factor-α
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Acknowledgments
This study was supported by Grants-in-aid for Scientific Research (A) (22248033), Scientific Research (B) (20390073, 21390045), and Exploratory Research (19659017, 22659213); and the joint research project of the Japan-Korea basic scientific cooperation program from JSPS; by the “Academic Frontier” Project for Private Universities (2007–2011) and by a Regional Joint Research Program supported by grants to Private Universities to Cover Current Expenses from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT); by Research on Regulatory Science of Pharmaceuticals and Medical Devices; and by Research on Risk of Chemical Substances, Health and Labour Science Research Grants supported by the Ministry of Health, Labour and Welfare, Japan (MHLW).
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Lu, P., Mamiya, T., Lu, L. et al. Xanthoceraside attenuates amyloid β peptide25–35-induced learning and memory impairments in mice. Psychopharmacology 219, 181–190 (2012). https://doi.org/10.1007/s00213-011-2386-1
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DOI: https://doi.org/10.1007/s00213-011-2386-1