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Live Images of GLUT4 Protein Trafficking in Mouse Primary Hypothalamic Neurons Using Deconvolution Microscopy
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Dietary sugars, not lipids, drive hypothalamic inflammation.

Yuanqing Gao1, Maximilian Bielohuby2, Thomas Fleming3

  • 1Institute for Diabetes and Obesity, Helmholtz Diabetes Center (HDC), Helmholtz Zentrum München and German Center for Diabetes Research (DZD), München-Neuherberg, Germany; Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, The Netherlands.

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High-carbohydrate high-fat diets, not high-fat diets alone, trigger hypothalamic inflammation via advanced glycation end-products (AGEs), leading to metabolic dysfunction. Blocking AGEs receptor (RAGE) and activated leukocyte cell-adhesion molecule (ALCAM) improved outcomes.

Keywords:
AngiogenesisMicrogliaObesityPOMCPericytes

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Area of Science:

  • Neuroscience
  • Metabolism
  • Immunology

Background:

  • Obesity induced by hypercaloric diets increases hypothalamic microglial reactivity and cytokine production.
  • The specific roles of dietary fat and carbohydrates in hypothalamic inflammation and energy homeostasis remain unclear.

Purpose of the Study:

  • To investigate the distinct effects of high-carbohydrate high-fat (HCHF) and low-carbohydrate high-fat (LCHF) diets on hypothalamic inflammation.
  • To test if HCHF diets induce inflammation via advanced glycation end-products (AGEs) using genetically modified mice.

Main Methods:

  • Compared HCHF and LCHF diets' impact on hypothalamic inflammation in neurons and non-neuronal cells.
  • Utilized mice lacking the receptor for AGEs (RAGE) and/or activated leukocyte cell-adhesion molecule (ALCAM).

Main Results:

  • HCHF diets, unlike LCHF diets, increased microgliosis and N(ε)-(Carboxymethyl)-Lysine (CML), a key AGE, in specific hypothalamic neurons.
  • Neuron-secreted CML interacts with RAGE and ALCAM on various brain cells.
  • Mice lacking RAGE and ALCAM showed reduced microglial activation and neovascularization, improving HCHF diet-induced metabolic disorders.

Conclusions:

  • Combined fat and sugar overconsumption, not fat alone, drives CML production in hypothalamic neurons.
  • This CML stimulates hypothalamic inflammation (microgliosis), impairing energy metabolism control.
  • Targeting AGEs pathways may offer therapeutic strategies for diet-induced obesity.