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Nobiletin prevents amyloid β1-40-induced cognitive impairment via inhibition of neuroinflammation and oxidative/nitrosative stress

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Abstract

Alzheimer’s disease (AD) is presented as an age-related neurodegenerative disease with multiple cognitive deficits and amyloid β (Aβ) accumulation is the most important involved factor in its development. Nobiletin is a bioflavonoid isolated from citrus fruits peels with anti-inflammatory and anti-oxidative activity as well as anti-dementia property that has shown potency to ameliorate intracellular and extracellular Ab. The aim of the present study was to assess protective effect of nobiletin against Aβ1−40-induced cognitive impairment as a consistent model of AD. After bilateral intrahippocampal (CA1 subfield) injection of Aβ1−40, rats were treated with nobiletin (10 mg/kg/day; p.o.) from stereotaxic surgery day (day 0) till day + 7. Cognition function was evaluated in a battery of behavioral tasks at week 3 with final assessment of hippocampal oxidative stress and inflammation besides Nissl staining and 3-nitrotyrosine (3-NT) immunohistochemistry. Analysis of behavioral data showed notable and significant improvement of alternation in Y maze test, discrimination ratio in novel object recognition task, and step through latency in passive avoidance test in nobiletin-treated Aβ group. Additionally, nobiletin treatment was associated with lower hippocampal levels of MDA and ROS and partial reversal of SOD activity and also improvement of Nrf2 with no significant effect on GSH and catalase. Furthermore, nobiletin attenuated hippocampal neuroinflammation in Aβ group as shown by lower tissue levels of TLR4, NF-kB, and TNFa. Histochemical findings showed that nobiletin prevents CA1 neuronal loss in Nissl staining in addition to its alleviation of 3-nitrotyrosine (3-NT) immunoreactivity as a marker of nitrosative stress. Collectively, these findings indicated neuroprotective and anti-dementia potential of nobiletin that is partly attributed to its anti-oxidative, anti-nitrosative, and anti-inflammatory property associated with proper modulation of TLR4/NF-kB/Nrf2 pathways.

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Data availability

The data sets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research study was certified (grant # 120 − 94) and financially supported by Shahed University (Tehran, Iran) in 2017.

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R.GT, M.F., M.K, and S.K. performed study experiments and assisted in data analysis. Z.K. and M.R. designed the study, supervised the experiments, analyzed data, and prepared the draft of the manuscript. T.B. helped in study design, data analysis, and manuscript writing.

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Correspondence to Marzieh Fakour or Mehrdad Roghani.

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No conflict of interest is declared by the authors. The authors alone are accountable for the content and writing of the paper.

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Ghasemi-Tarie, R., Kiasalari, Z., Fakour, M. et al. Nobiletin prevents amyloid β1-40-induced cognitive impairment via inhibition of neuroinflammation and oxidative/nitrosative stress. Metab Brain Dis 37, 1337–1349 (2022). https://doi.org/10.1007/s11011-022-00949-y

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  • DOI: https://doi.org/10.1007/s11011-022-00949-y

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