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Hypothalamic eIF2α signaling regulates food intake.

Anne-Catherine Maurin1, Alexandre Benani2, Anne Lorsignol3

  • 1UMR 1019 Nutrition Humaine, INRA, Université Clermont 1, Centre de Clermont-Ferrand-Theix, 63122 Saint Genès Champanelle, France.

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Summary
This summary is machine-generated.

Dietary amino acid deficiency activates brain GCN2 kinase, inhibiting food intake. Hypothalamic eIF2α phosphorylation by GCN2 controls appetite and may cause disease-related anorexia.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cellular Signaling

Background:

  • Reversible phosphorylation of eukaryotic initiation factor 2 alpha (eIF2α) is a conserved stress response.
  • The eIF2α kinase GCN2 is activated by amino acid limitation, leading to food intake inhibition in the brain.

Purpose of the Study:

  • To investigate the role of GCN2 and eIF2α phosphorylation in the mediobasal hypothalamus (MBH) in regulating food intake.
  • To determine if MBH GCN2 activation is necessary for the aversive response to amino acid deficiency.

Main Methods:

  • Assessed GCN2 activation in the MBH of rats fed a leucine-deficient diet.
  • Utilized GCN2 knockdown in the MBH to evaluate its role in controlling the aversive response.
  • Administered pharmacological agents to induce eIF2α phosphorylation specifically in the MBH.

Main Results:

  • GCN2 rapidly activated in the MBH upon consumption of a leucine-deficient diet.
  • Knockdown of GCN2 in the MBH demonstrated its control over the onset of the aversive response.
  • Pharmacological induction of eIF2α phosphorylation in the MBH was sufficient to regulate food intake.

Conclusions:

  • Hypothalamic GCN2 activation and subsequent eIF2α phosphorylation are critical for inhibiting food intake during amino acid deficiency.
  • This signaling pathway in the MBH plays a key role in appetite regulation and may be involved in anorexia associated with certain diseases.