Abstract
Currently, accumulating evidence has indicated that overnutrition-associated obesity may result in not only metabolic dysregulations, but also cognitive impairments. This study aimed to investigate the protective effects of Diosmetin, a bioflavonoid compound with multiple biological functions, on cognitive deficits induced by a high fat diet (HFD) and the potential mechanisms. In the present study, oral administration of Diosmetin (25, 50 and 100 mg/kg) for 12 weeks significantly reduced the body weight, restored glucose tolerance and normalized lipid profiles in the serum and liver in HFD-induced obese rats. Diosmetin also significantly ameliorated depression-like behaviors and impaired spatial memory in multiple behavioral tests, including the open field test, elevated plus-maze and Morris water maze, which was in accordance with the decreased pathological changes and neuronal damage in different regions of hippocampus as suggested by H&E and Nissl staining. Notably, our results also indicated that Diosmetin could significantly improve mitochondrial dysfunction induced by HFD through upregulating genes involved in mitochondrial biogenesis and dynamics, increasing mitochondrial ATP levels and inhibiting oxidative stress. Moreover, the levels of key enzymes involved in the TCA cycle were also significantly increased upon Diosmetin treatment. Meanwhile, Diosmetin inhibited HFD-induced microglial overactivation and down-regulated inflammatory cytokines both in the serum and hippocampus. In conclusion, these results indicated that Diosmetin might be a novel nutritional intervention to prevent the occurrence and development of obesity-associated cognitive dysfunction via metabolic regulation and anti-inflammation.
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Data Availability
The data that supports the findings of this study are available on reasonable request from the corresponding author.
Abbreviations
- Bax:
-
pro-apoptotic protein Bcl-2 Associated X
- Bcl-2:
-
B-cell lymphoma-2
- BDNF:
-
brain-derived neurotrophic factor
- CA1:
-
cornuammonis region 1
- CA3:
-
cornuammonis region 3
- CAT:
-
catalase
- COX2:
-
cyclooxygenase-2
- CS:
-
citrate synthase
- cycs:
-
cytochrome c
- DAPI:
-
40,60-diamidino-2-phenylindole
- DG:
-
dentate gyrus region
- EPM:
-
elevated plus-maze
- HDL-C:
-
high-density lipoprotein cholesterol
- HFD:
-
high fat diet
- IBA-1:
-
Ionized calcium binding adapter molecule 1
- IL-1β:
-
interleukin-1β
- IL-6:
-
interleukin-6
- iNOS:
-
inducible nitric oxide synthase
- LDL-C:
-
low-density lipoprotein cholesterol
- MDA:
-
malondialdehyde
- Mfn1:
-
Mitofusin 1
- Mfn2:
-
Mitofusin 2
- MMP3:
-
matrix metalloproteinase-3
- MMP9:
-
matrix metalloproteinase-9
- MWM:
-
Morris water maze
- NGF:
-
nerve growth factor
- Nrf1:
-
nuclear respiratory factor-1
- Nrf2:
-
Nuclear factor erythroid2-related factor 2
- NT-3:
-
neurotrophin-3
- NT-4:
-
neurotrophin-4
- OFT:
-
open field test
- OGDH:
-
α-ketoglutarate dehydrogenase
- OGTT:
-
Oral glucose tolerance test
- PDH:
-
pyruvate dehydrogenase
- PDK:
-
pyruvate dehydrogenase kinase
- PGC-1α:
-
peroxisome proliferator activated receptor co-activator-1α
- PSD95:
-
postsynaptic density protein-95
- SD:
-
Sprague-Dawley
- SIRT1:
-
Sirtuin1
- SNAP25:
-
synaptosome associated protein 25
- SOD:
-
superoxide dismutase
- TC:
-
total cholesterol
- TCA:
-
tricarboxylic acid
- TNF-α:
-
Tumor necrosis factor-α
- Tfam:
-
transcription factor A
- TG:
-
triglyceride
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Acknowledgements and Contributions
The authors’ responsibilities were as followed. Y. Z. and H. D. designed research; Y. Z., C.L., P.H., Y.C., Y.M. and J.G. conducted research; Y. Z. and H. D. analyzed data; Y. Z. wrote the paper; Y. Z. and H. D. had primary responsibility for the final content. All authors read and approved the final version of the paper.
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Protocols were conducted according to the Regulations of the Chinese Council on Animal Care and approved by the Ethics Committee of Wuhan University Center for Animal Experiment, Wuhan, China (NO. WP20210532).
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Y. Zhang, C. Luo, P. Huang, Y. Cheng, Y. Ma, J. Gao, H. Ding, no conflicts of interest.
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Zhang, Y., Luo, C., Huang, P. et al. Diosmetin Ameliorates HFD-induced Cognitive Impairments via Inhibiting Metabolic Disorders, Mitochondrial Dysfunction and Neuroinflammation in Male SD Rats. Mol Neurobiol (2024). https://doi.org/10.1007/s12035-024-04083-x
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DOI: https://doi.org/10.1007/s12035-024-04083-x