Abstract
Accumulated evidence indicates that neuroinflammation induces insulin resistance in the brain. Moreover, both processes are intimately linked to neurodegenerative disorders, including Alzheimer’s disease. Potential mechanisms underlying insulin resistance include serine phosphorylation of the insulin receptor substrate (IRS) or insulin receptor (IR) misallocation. However, only a few studies have focused on IRS expression in the brain and its modulation in neuroinflammatory processes. This study used the high-fat diet (HFD) model of neuroinflammation to study the alterations of IR, an insulin-like growth factor receptor (IGF1R) and IRS expressions in the hippocampus. We observed that HFD effectively reduced mRNA and protein IRS2 expression. In contrast, a HFD induced the upregulation of the IRS1 mRNA levels, but did not alter an IR and IGF1R expression. As expected, we observed that a HFD increased hippocampal tumor necrosis factor alpha (TNFα) and amyloid precursor protein (APP) levels while reducing brain-derived neurotrophic factor (BDNF) expression and neurogenesis. Interestingly, we found that TNFα correlated positively with IRS1 and negatively with IRS2, whereas APP levels correlated positively only with IRS1 but not IRS2. These results indicate that IRS1 and IRS2 hippocampal expression can be affected differently by HFD-induced neuroinflammation. In addition, we aimed to establish whether abscisic acid (ABA) can rescue hippocampal IRS1 and IRS2 expression, as we had previously shown that ABA supplementation prevents memory impairments and improves neuroinflammation induced by a HFD. In this study, ABA restored HFD-induced hippocampal alterations, including IRS1 and IRS2 expression, TNFα, APP, and BDNF levels and neurogenesis. In conclusion, this study highlights different regulations of hippocampal IRS1 and IRS2 expression using a HFD, indicating the important differences of these scaffolding proteins, and strongly supports ABA therapeutic effects.
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Change history
26 February 2019
The author missed to include the second affiliation of Mariam Atef to the original paper published. With this, the authors published this correction.
Abbreviations
- ABA:
-
Abscisic acid
- ANOVA:
-
Analysis of variance
- APP:
-
Amyloid precursor protein
- BDNF:
-
Brain-derived neurotrophic factor
- ERK:
-
Extracellular regulated kinases
- HFD:
-
High-fat diet
- IGF1:
-
Insulin-like growth factor
- IGF1R:
-
Insulin-like growth factor receptor
- IR:
-
Insulin receptor
- IRS:
-
Insulin receptor substrate
- PFA:
-
Paraformaldehyde
- PPAR-γ:
-
Peroxisome proliferator-activated receptor gamma
- RTqPCR:
-
Real-time quantitative polymerase chain reaction
- SEM:
-
Standard error of mean
- SD:
-
Standard diet
- SGZ:
-
Subgranular zone
- TBS:
-
Tris-buffered saline
- TDZ:
-
Thiazolidinediones
- TNFα:
-
Tumor necrosis factor alpha
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Funding
This work was supported by Plan Propi Universitat Jaume I P1.1A2014-06 and Generalitat Valenciana GVA AICO/2015/042 to AMSP. The authors want to thank the generous donations to Crowdfunding Precipita (FECYT) and the Association of Alzheimer Families, AFA, Castellon.
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Ribes-Navarro, A., Atef, M., Sánchez-Sarasúa, S. et al. Abscisic Acid Supplementation Rescues High Fat Diet-Induced Alterations in Hippocampal Inflammation and IRSs Expression. Mol Neurobiol 56, 454–464 (2019). https://doi.org/10.1007/s12035-018-1091-z
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Keywords
- Insulin resistance
- Hippocampus
- APP
- BDNF
- Neurogenesis
- Neuroinflammation