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Neurochemical Research

, Volume 43, Issue 12, pp 2333–2342 | Cite as

Trans-cinnamaldehyde Modulates Hippocampal Nrf2 Factor and Inhibits Amyloid Beta Aggregation in LPS-Induced Neuroinflammation Mouse Model

  • Doaa Abou El-ezz
  • Ahmed Maher
  • Nada Sallam
  • Amany El-brairy
  • Sanaa Kenawy
Original Paper
  • 123 Downloads

Abstract

Trans-cinnamaldehyde (CNM) has recently drawn attention due to its potent anti-inflammatory and antioxidant properties. The current study explored the memory enhancing effects of CNM against lipopolysaccharide (LPS)-induced neuroinflammation in mice. CNM and curcumin (a reference antioxidant) were administered at a dose of 50 mg/kg i.p. 3 h after a single LPS injection (0.8 mg/kg, i.p.) and continued daily for 7 days. Our results displayed that CNM and curcumin significantly ameliorated the LPS-induced impairment of learning and memory, neuroinflammation, oxidative stress and neuronal apoptosis. Memory functions and locomotor activity were assessed by Morris water maze, object recognition test and open field test. Both CNM and curcumin activated the nuclear factor erythroid 2 related factor 2 (Nrf2) and restored levels of downstream antioxidant enzymes superoxide dismutase and glutathione-S-transferase (GST) in the hippocampus. They also attenuated LPS-induced increase in hippocampal contents of interleukin-1β (IL-1β), malondialdehyde and caspase-3. Immunohistochemistry results showed that both CNM and curcumin reduced Aβ1–42 protein accumulation in brain of mice. Remarkably CNM’s effect on IL-1β was less pronounced than curcumin; however it showed higher GST activity and more potent anti-apoptotic and anti-amylodogenic effect. We conclude that, CNM produces its memory enhancing effects through modulation of Nrf2 antioxidant defense in hippocampus, inhibition of neuroinflammation, apoptosis and amyloid protein burden.

Keywords

Trans-cinnamaldehyde Neuroinflammation Nrf2 Curcumin LPS Amyloid beta 

Notes

Acknowledgements

The authors are grateful for Dr. Nouran Elshehaby who generously provided the Aβ1–42 antibody and Dr. Asmaa Khairy who helped with immunohistochemistry analysis.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.

Informed Consent

Informed consent was obtained from all individual participants included in the study.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Pharmacology and Toxicology, Faculty of PharmacyMSA UniversityCairoEgypt
  2. 2.Department of Biochemistry, Faculty of PharmacyMSA UniversityCairoEgypt
  3. 3.Department of Pharmacology and Toxicology, Faculty of PharmacyCairo UniversityCairoEgypt
  4. 4.Department of Physiology and Pharmacology, Cumming School of MedicineUniversity of CalgaryCalgaryCanada

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