Abstract
This study is aimed at determining whether royal jelly (RJ) which has a powerful antioxidant property prevents fluoride-induced brain tissue damage and exploring whether Bcl-2/NF-κB/ and caspase-3/caspase-6/Bax/Erk pathways play a critical role in the neuroprotective effect of RJ. Wistar albino rats were chosen for the study, and they were randomly distributed into six groups: (i) control; (ii) royal jelly; (iii) fluoride-50; (iv) fluoride-100; (v) fluoride-50 + royal jelly; (vi) fluoride-100 + royal jelly. We established fluoride-induced brain tissue damage with 8-week-old male Wistar albino rats by administration of fluoride exposure (either 50 mg/kg or 100 mg/kg bw) through drinking water for 8 weeks. Then, the study duration is for 56 days where the rats were treated with or without RJ (100 mg/kg bw) through oral gavage. The effects of RJ on glutathione (GSH), catalase activity (CAT), and malondialdehyde (MDA) levels were determined via spectrophotometer. Western blot analysis was performed to investigate the effects of royal jelly on the protein expression levels of Bax, caspase-3, caspase-6, Bcl-2, NF-κB, COX-2, and Erk. It was also studied the effects of RJ on histopathological alterations in fluoride-induced damage to the rat brain. As a result, the Bcl-2, NF-κB, and COX-2 protein expression levels were increased in the fluoride-treated (50 and 100 mg/kg) groups but they were decreased significantly by RJ treatment in the brain tissue. Additionally, the protein expression of caspase-3, caspase-6, Bax, and Erk were decreased in fluoride-treated groups and they were significantly increased by RJ treatment compared to the un-treated rats. Our results suggested that RJ prevented fluoride-induced brain tissue damage through anti-antioxidant activities.
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Financial support was provided from the Firat University Research Projects Unit (FUBAP) [Grant No. FF.19.16].
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AA designed the project, coordinated the study, and drafted the manuscript. AA and SB wrote the article, review-editing. SB, OG, MIC, GP, IHO, CAA, and AEP carried out the experiments, participated in data analysis, and contributed to the interpretation of the results. CAA took the lead in review editing the manuscript. All authors gave critical feedback and approved the final manuscript.
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The animal study was conducted in accordance with international (the Declaration of Helsinki), Turkish national legislation and local guidelines and performed at Experimental Animals Research Center, affiliated to School of Medicine, Firat University. The local animal ethics committee approved the experimental protocol (Ethical Issue No. 2020/11, Dated on 20/08/2020, Elazig, Turkey). All efforts were adopted to handle the rats humanely and to achieve ethical rules.
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Some parts of the results of this manuscript were submitted orally at the 2nd International Congress on Medical Sciences and Biotechnology (1–3 October 2020, 303, Usak, Turkey) and Mas 14th International European Conference on Mathematics, Engineering, Natural & Medical Sciences (26–28 March 2021, Széchenyi István University, Hungary).
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Aslan, A., Beyaz, S., Gok, O. et al. Royal jelly protects brain tissue against fluoride-induced damage by activating Bcl-2/NF-κB/caspase-3/caspase-6/Bax and Erk signaling pathways in rats. Environ Sci Pollut Res 30, 49014–49025 (2023). https://doi.org/10.1007/s11356-023-25636-y
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DOI: https://doi.org/10.1007/s11356-023-25636-y