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TLR4 in circumventricular neural stem cells is a negative regulator for thermogenic pathways in the mouse brain.
Journal of Neuroimmunology 2018 May 4
Toll-like receptor 4 (TLR4) recognizes bacteria-derived lipopolysaccharide (LPS). In the present study, we found that intraperitoneal LPS activated nuclear factor-κ B (NF-κB) in TLR4-expressing neural stem cells (NSCs) in the circumventricular brain regions of mice. Intracerebroventricular preadministration of low-dose TLR4 inhibitors significantly augmented hyperthermia together with the inhibition of NF-κB activation in circumventricular NSCs of LPS-inflamed animals. Moreover, intracerebroventricular administration of high-dose TLR4 inhibitors induced hyperthermia and Fos activation in circumventricular NSCs and hypothalamic neurons. These results suggest that TLR4 on circumventricular NSCs functions as a central regulator for thermogenesis under inflamed and normal conditions.
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