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Increasing muscle mass improves vascular function in obese (db/db) mice.

Shuiqing Qiu1, James D Mintz1, Christina D Salet1

  • 1Vascular Biology Center and Department of Physiology, Georgia Regents University, Augusta, GA, Germany (S.Q., J.D.M., C.D.S., W.H., A.G., F.C., Y.Y., Y.S., D.J.F., D.W.S.).

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Summary

Genetic deletion of myostatin boosts muscle mass and enhances nitric oxide-mediated vasodilation in obese mice by reducing superoxide levels. This finding offers new insights into vascular function and obesity.

Keywords:
NOX1muscle massmyostatinoxidant stresstetrahydrobiopterinvasodilation

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Area of Science:

  • Cardiovascular physiology
  • Muscle biology
  • Metabolic disease research

Background:

  • A sedentary lifestyle increases cardiovascular disease risk and reduces muscle mass.
  • The link between muscle mass and vascular function is not well understood.
  • Myostatin negatively regulates muscle growth.

Purpose of the Study:

  • To investigate if increasing muscle mass via myostatin deletion influences vascular function in obese mice.
  • To explore the role of myostatin in the relationship between obesity, muscle mass, and vascular health.

Main Methods:

  • Genetic deletion of myostatin in obese (db/db) and lean mice.
  • Assessment of muscle mass, adipose tissue, and insulin sensitivity.
  • Evaluation of endothelial vasodilation in mesenteric arteries using various inhibitors and agents.
  • Measurement of reactive oxygen species (ROS) and nitric oxide (NO) pathways.

Main Results:

  • Myostatin deletion significantly increased muscle mass in both lean and obese mice.
  • Obese mice exhibited impaired endothelial vasodilation, linked to elevated reactive oxygen species (ROS).
  • Myostatin deletion improved vasodilation in obese mice by down-regulating ROS and enhancing nitric oxide (NO) bioavailability.
  • Prostacyclin (PGI2) and endothelium-derived hyperpolarizing factor (EDHF) mediated vasodilation remained unaffected.

Conclusions:

  • Increasing muscle mass through myostatin deletion improves nitric oxide (NO)-mediated vasodilation in obese mice.
  • This improvement in vascular function is primarily mediated by the down-regulation of superoxide.
  • Myostatin inhibition represents a potential therapeutic target for vascular dysfunction associated with obesity.