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Updated: Nov 3, 2025

Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
Published on: May 16, 2021
ARCGHR Neurons Regulate Muscle Glucose Uptake.
Juliana Bezerra Medeiros de Lima1, Lucas Kniess Debarba1, Alan C Rupp2
1Department of Biological Sciences, Integrative Biosciences Center (IBio), Wayne State University, Detroit, MI 48202, USA.
Growth hormone receptor (GHR) neurons in the hypothalamus arcuate nucleus (ARC) regulate feeding and glucose metabolism. Activating these ARC GHR+ neurons enhances glucose utilization and improves insulin sensitivity, particularly in skeletal muscle.
Area of Science:
- Neuroendocrinology
- Metabolic Regulation
- Molecular Biology
Background:
- Growth hormone receptor (GHR) is present in brain areas controlling energy and glucose metabolism.
- Understanding GHR-expressing neurons in the arcuate nucleus (ARC) is crucial for metabolic research.
Purpose of the Study:
- To characterize the role of GHR-expressing neurons in the ARC.
- To investigate the impact of ARC GHR+ neuron activation on feeding behavior and glucose metabolism.
Main Methods:
- Generated a novel GHR-cre transgenic mouse line.
- Utilized designer receptors exclusively activated by designer drugs (DREADD) for neuronal control.
- Performed hyperinsulinemic-euglycemic clamp studies.
Main Results:
- ARC GHR+ neurons are co-localized with AgRP, GHRH, and somatostatin neurons.
- Activation of ARC GHR+ neurons increased respiratory exchange ratio (RER) and promoted feeding.
- Fasting activation of ARC GHR+ neurons enhanced glucose utilization over fat, improving glucose tolerance.
- Increased insulin sensitivity and glucose uptake were observed in skeletal muscle.
Conclusions:
- ARC GHR+ neurons are key regulators of glycolysis and muscle insulin sensitivity.
- GHR signaling in the ARC plays a significant role in maintaining metabolic homeostasis.
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