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Metabolic Brain Disease

Erschienen in:

02.03.2017 | Original Article

Investigation of thymol effect on learning and memory impairment induced by intrahippocampal injection of amyloid beta peptide in high fat diet- fed rats

verfasst von: Masoumeh Asadbegi, Parichehreh Yaghmaei, Iraj Salehi, Alireza Komaki, Azadeh Ebrahim-Habibi

Erschienen in: Metabolic Brain Disease | Ausgabe 3/2017

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Abstract

Obesity and consumption of a high fat diet (HFD) are known to increase the risk of Alzheimer’s disease (AD). In the present study, we have examined the protective and therapeutic effects of thymol (main monoterpene phenol found in thyme essential oil) on a HFD-fed rat model of AD. Fourty adult male Wistar rats were randomly assigned to 5 groups:(n = 8 rats/group): group 1, control, consumed an ordinary diet, group 2 consumed a HFD for 8 weeks, then received phosphate-buffered saline (PBS) via intrahippocampal (IHP) injection, group 3 consumed HFD for 8 weeks, then received beta-amyloid (Aβ)1–42 via IHP injections to induce AD, group 4 consumed HFD for 8 weeks, then received Aβ1–42, and was treated by thymol (30 mg/kg in sunflower oil) daily for 4 weeks, and group 5 consumed HFD for 8 week, then received Aβ1–42 after what sunflower oil was administered by oral gavage daily for 4 weeks. Biochemical tests showed an impaired lipid profile and higher glucose levels upon consumption of HFD, which was ameliorated by thymol treatment. In behavioral results, spatial memory in group 3 was significantly impaired, but groups treated with thymol showed better spatial memory compared to group 3 (p ≤ 0.01). In histological results, formation of Aβ plaque in hippocampus of group 3 increased significantly compared to group 1 and group 2 (p ≤ 0.05), but group 4 showed decreased Aβ plaques compared to group 3 (p ≤ 0.01). In conclusion, thymol decreased the effects of Aβ on memory and could be considered as neuroprotective.

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Titel: Investigation of thymol effect on learning and memory impairment induced by intrahippocampal injection of amyloid beta peptide in high fat diet- fed rats
verfasst von: Masoumeh Asadbegi
Parichehreh Yaghmaei
Iraj Salehi
Alireza Komaki
Azadeh Ebrahim-Habibi
Publikationsdatum: 02.03.2017
Verlag: Springer US
Erschienen in: Metabolic Brain Disease / Ausgabe 3/2017
Print ISSN: 0885-7490
Elektronische ISSN: 1573-7365
DOI: https://doi.org/10.1007/s11011-017-9960-0

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Investigation of thymol effect on learning and memory impairment induced by intrahippocampal injection of amyloid beta peptide in high fat diet- fed rats

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