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Hypercholesterolemia and 27-Hydroxycholesterol Increase S100A8 and RAGE Expression in the Brain: a Link Between Cholesterol, Alarmins, and Neurodegeneration
We report that a high-fat/high-cholesterol diet leads to an i ncrease in S100A8 production in the brain. In CYP27Tg, we report an increase of S100A8 and its receptor RAGE in the hippocampus under elevated 27-OH in the brain. Using siRNA, we found that 27-OH upregulation of RAGE in astrocytes and neurons is mediated by the nuclear receptor RXRγ. Silencing RXRγ in neurons prevented 27-OH-mediated upregulation of RAGE. These results show that S100A8 alarmin and RAGE respond to high levels of 27-OH in the brain in both neurons and astrocytes through RXRγ. Our study supports the notion that 27-OH mediates detrimental effects...
Source: Molecular Neurobiology - August 27, 2021 Category: Neurology Source Type: research

A Hypothalamic Leptin-Glutamate Interaction in the Regulation of Sympathetic Nerve Activity.
In conclusion, these studies provide evidence that within the hypothalamic nuclei, leptin-glutamate signaling regulates the sympathetic activation. This may contribute to the sympathoexcitation commonly observed in obesity-related T2D. PMID: 28845307 [PubMed - in process]
Source: Neural Plasticity - August 30, 2017 Category: Neurology Authors: Zheng H, Liu X, Li Y, Patel KP Tags: Neural Plast Source Type: research