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Cultured hypothalamic neurons are resistant to inflammation and insulin resistance induced by saturated fatty acids. | LitMetric

Cultured hypothalamic neurons are resistant to inflammation and insulin resistance induced by saturated fatty acids.

Am J Physiol Endocrinol Metab

Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine and Diabetes, University of Washington, Seattle, WA 98109-4714, USA.

Published: June 2010

AI Article Synopsis

Article Abstract

Hypothalamic inflammation induced by high-fat feeding causes insulin and leptin resistance and contributes to the pathogenesis of obesity. Since in vitro exposure to saturated fatty acids causes inflammation and insulin resistance in many cultured cell types, we determined how cultured hypothalamic neurons respond to this stimulus. Two murine hypothalamic neuronal cell cultures, N43/5 and GT1-7, were exposed to escalating concentrations of saturated fatty acids for up to 24 h. Harvested cells were evaluated for activation of inflammation by gene expression and protein content. Insulin-treated cells were evaluated for induction of markers of insulin receptor signaling (p-IRS, p-Akt). In both hypothalamic cell lines, inflammation was induced by prototypical inflammatory mediators LPS and TNFalpha, as judged by induction of IkappaBalpha (3- to 5-fold) and IL-6 (3- to 7-fold) mRNA and p-IkappaBalpha protein, and TNFalpha pretreatment reduced insulin-mediated p-Akt activation by 30% (P < 0.05). By comparison, neither mixed saturated fatty acid (100, 250, or 500 microM for

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2886534PMC
http://dx.doi.org/10.1152/ajpendo.00006.2010DOI Listing

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