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Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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STAT3 phosphorylation in central leptin resistance.

Huimin Liu1, Tianxin Du1, Chen Li1

  • 1College of Life Science, Henan Agricultural University, 95 Wen Hua Road, Zhengzhou, 450002, China.

Nutrition & Metabolism
|April 14, 2021
PubMed
Summary
This summary is machine-generated.

Leptin resistance, a major hurdle in obesity treatment, may stem from impaired STAT3 phosphorylation in the hypothalamus. Understanding this mechanism is crucial for developing effective obesity therapies.

Keywords:
DIOHypothalamusLeptin resistanceMechanismSTAT3 phosphorylation

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Area of Science:

  • Metabolic Disorders
  • Neuroendocrinology
  • Obesity Research

Background:

  • Obesity and related metabolic disorders are global health crises requiring novel therapeutic strategies.
  • Leptin is a key regulator of energy balance, but leptin resistance in obese individuals limits its therapeutic potential.
  • The precise mechanisms underlying leptin resistance remain largely elusive despite extensive research.

Purpose of the Study:

  • To review current literature on leptin and leptin resistance.
  • To elucidate the role of STAT3 phosphorylation in central leptin resistance.
  • To investigate the significance of phosphorylated STAT3 (p-STAT3) in the hypothalamus of diet-induced obese (DIO) mice.

Main Methods:

  • Comprehensive literature review on leptin signaling and resistance.
  • Analysis of the JAK2-STAT3 pathway activation upon leptin stimulation.
  • Examination of p-STAT3 status and its hypothalamic significance in DIO mice models.

Main Results:

  • Leptin receptor (LepRb) signaling in the hypothalamus, particularly via the JAK2-STAT3 pathway, is critical for energy regulation.
  • STAT3 phosphorylation is a key event in leptin signaling, leading to nuclear translocation and target gene regulation (e.g., POMC).
  • The detailed interaction between STAT3 and genes like POMC, and the status of p-STAT3 in DIO mice, require further elucidation.

Conclusions:

  • STAT3 phosphorylation is a potential contributor to central leptin resistance.
  • Further research into p-STAT3 dynamics in the hypothalamus is essential for understanding and overcoming leptin resistance.
  • Targeting STAT3 phosphorylation may offer a novel therapeutic avenue for obesity and metabolic disorders.