Abstract
Accumulating studies suggest that overnutrition-associated obesity may lead to development of type 2 diabetes mellitus and metabolic syndromes (MetS). MetS and its components are important risk factors of mild cognitive impairment, age-related cognitive decline, vascular dementia, and Alzheimer’s disease. It has been recently proposed that development of a disease-course modification strategy toward early and effective risk factor management would be clinically significant in reducing the risk of metabolic disorder-initiated cognitive decline. In the present study, we propose that fibroblast growth factor 21 (FGF21) is a novel candidate for the disease-course modification approach. Using a high-fat diet (HFD) consumption-induced obese mouse model, we tested our hypothesis that recombinant human FGF21 (rFGF21) administration is effective for improving obesity-induced cognitive dysfunction and anxiety-like behavior, by its multiple metabolic modulation and anti-pro-inflammation actions. Our experimental findings support our hypothesis that rFGF21 is protective to HFD-induced cognitive impairment, at least in part by metabolic regulation in glucose tolerance impairment, insulin resistance, and hyperlipidemia; potent systemic pro-inflammation inhibition; and improvement of hippocampal dysfunction, particularly by inhibiting pro-neuroinflammation and neurogenesis deficit. This study suggests that FGF21 might be a novel molecular target of the disease-course-modifying strategy for early intervention of MstS-associated cognitive decline.
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Abbreviations
- Akt:
-
Protein kinase B
- BBB:
-
Blood-brain barrier
- BDNF:
-
Brain-derived neurotrophic factor
- DCX:
-
Doublecortin
- DG:
-
Dentate gyrus
- FGF21:
-
Fibroblast growth factor 21
- FGFR1:
-
Fibroblast growth factor receptor 1
- GSK-3β:
-
Glycogen synthase kinase 3 beta
- GTT:
-
Glucose tolerance test
- HbA1c:
-
Glycated hemoglobin
- HDL:
-
High-density lipoproteins
- HFD:
-
High-fat diet
- Iba1:
-
Ionized calcium binding adaptor molecule 1
- IGF-1:
-
Insulin-like growth factor-1
- IL-1β:
-
Interleukin 1 beta
- IL-6:
-
Interleukin 6
- i.p.:
-
Intraperitoneal injection
- ITT:
-
Insulin tolerance test
- LDL:
-
Low-density lipoproteins
- MetS:
-
Metabolic syndrome
- MHCII:
-
Major histocompatibility complex class II
- PCR:
-
Polymerase chain reaction
- PSD95:
-
Postsynaptic density protein 95
- rFGF21:
-
Recombinant human fibroblast growth factor 21
- RI:
-
Recognition index
- SD:
-
Standard diet
- SEM:
-
Standard error of the mean
- TC:
-
Total cholesterol
- TG:
-
Triglycerides
- TNFα:
-
Tumor necrosis factor alpha
- WAT:
-
White adipose tissue
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Acknowledgments
This study was in part supported by National Institute of Health grant RO1 NS099539, National Natural Science Foundation of China grant 52111000 and 81470999, and Ministry of Science and Technology of China grant 2011ZX09102-004.
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All animal experiments were performed following protocols approved by the Massachusetts General Hospital Institutional Animal Care and Use Committee in compliance with the NIH Guide for the Care and Use of Laboratory Animals. All efforts were exerted to minimize animal suffering.
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The authors declare that they have no conflict of interest.
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Supplemental Figure 1
rFGF21 reduces pro-inflammatory cytokine mRNA expression in brain cortex and hypothalamus of HFD mice. (a) Relative fold changes of IL-1β, IL-6 and TNFα mRNA levels in brain cortex. (b) Relative fold change of BDNF, IGF-1 and CD206 mRNA levels in brain cortex. (c) Relative fold changes of IL-1β, IL-6 and TNFα mRNA levels in brain hypothalamus. (d) Relative fold changes of BDNF, IGF-1 and CD206 mRNA levels in brain hypothalamus. Data are expressed as mean ± SE, n = 5 per group. *P < 0.05 versus SD; #P < 0.05 versus HFD. (PPTX 2519 kb)
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Wang, Q., Yuan, J., Yu, Z. et al. FGF21 Attenuates High-Fat Diet-Induced Cognitive Impairment via Metabolic Regulation and Anti-inflammation of Obese Mice. Mol Neurobiol 55, 4702–4717 (2018). https://doi.org/10.1007/s12035-017-0663-7
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DOI: https://doi.org/10.1007/s12035-017-0663-7