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Exercise training prevents dexamethasone-induced muscle rarefaction by boosting antioxidant enzymes and improving the balance between apoptotic and anti-apoptotic proteins.

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Area of Science:

  • Muscle physiology
  • Exercise science
  • Pharmacology

Background:

  • Dexamethasone (DEX) induces muscle rarefaction, a decrease in capillary density.
  • Exercise training (T) is known to prevent muscle rarefaction and promote angiogenesis.
  • The underlying mechanisms of training's protective effect against DEX-induced muscle rarefaction require further investigation.

Purpose of the Study:

  • To investigate the molecular mechanisms by which exercise training prevents dexamethasone-induced muscle rarefaction.
  • To analyze the impact of training on antioxidant enzymes, angiogenic factors, and apoptosis-related proteins in the context of dexamethasone treatment.

Main Methods:

  • Rats were subjected to 8 weeks of training or sedentary conditions, followed by 14 days of DEX or saline treatment.
  • Tibialis anterior muscles were analyzed for capillary density, capillary-to-fiber ratio, and protein/mRNA levels of key molecular markers.
  • Key markers included antioxidant enzymes (SOD-1, SOD-2, CAT), angiogenic factors (VEGF, VEGFR-2), and apoptosis regulators (Bcl-2, Bax, caspase-3).

Main Results:

  • DEX treatment significantly decreased capillary density, VEGF, VEGFR-2, COX-2, Bcl-2, and increased SOD-2 and cleaved caspase-3.
  • Exercise training counteracted DEX-induced reductions in capillary density, angiogenic factors, and anti-apoptotic proteins.
  • Training also increased catalase mRNA and improved the Bcl-2/Bax ratio and p-Bax/Bax levels in DEX-treated rats.

Conclusions:

  • Exercise training effectively prevents dexamethasone-induced muscle rarefaction.
  • This protective effect is mediated by enhanced antioxidant enzyme activity and a favorable shift in apoptotic and anti-apoptotic protein expression.
  • Training promotes angiogenesis and modulates apoptotic pathways, preserving muscle microvasculature against corticosteroid-induced damage.