Adipocyte differentiation induces dynamic changes in NF-kappaB expression and activity

American Journal of Physiology. Endocrinology and Metabolism
Anders H BergPhilipp E Scherer

Abstract

The adipocyte exerts an important role in energy homeostasis, both as depot for energy-rich triglycerides and as a source for metabolic hormones. Adipocytes also contribute to inflammation and the innate immune response. Although it can be physiologically beneficial to combine these two functions in a single cell type under some circumstances, the proinflammatory signals emanating from adipocytes in the obese state can have local and systemic effects that promote atherosclerosis and insulin resistance. The transcriptional machinery in the adipocyte that mediates these pro-inflammatory responses has remained poorly characterized to date. In particular, no information is currently available on the NF-kappaB family of transcription factors. Here, we show that adipogenesis is associated with changes in amount and subunit composition of the NF-kappaB complexes. NF-kappaB subunits p65 (RelA), p68 (RelB), and IkappaB are upregulated during fat cell differentiation. Correspondingly, basal NF-kappaB nuclear gel shift and luciferase reporter assays are induced in parallel during differentiation. Surprisingly, endotoxin sensitivity of the classical NF-kappaB pathway is substantially delayed and attenuated despite increased overall inflamm...Continue Reading

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