Publications by authors named "Zoltan Singlar"

The remodelling of the extracellular matrix plays an important role in skeletal muscle development and regeneration. Syndecan-4 is a cell surface proteoglycan crucial for muscle differentiation. Syndecan-4 mice have been reported to be unable to regenerate following muscle damage.

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The endocannabinoid system (ECS) refers to a widespread signaling system and its alteration is implicated in a growing number of human diseases. Cannabinoid receptors (CBRs) are highly expressed in the central nervous system and many peripheral tissues. Evidence suggests that CB1Rs are expressed in human and murine skeletal muscle mainly in the cell membrane, but a subpopulation is present also in the mitochondria.

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Aging and frailty are associated with a decline in muscle force generation, which is a direct consequence of reduced muscle quantity and quality. Among the leading contributors to aging is the generation of reactive oxygen species, the byproducts of terminal oxidation. Their negative effects can be moderated via antioxidant supplementation.

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Article Synopsis
  • A deletion in the myostatin gene in mice leads to increased body weight and muscle weakness, characterized by reduced expression of Orai1 and impaired store-operated calcium entry (SOCE).
  • The introduction of Venus-Orai1 to affected fibers did not restore SOCE, while silencing endogenous Orai1 in normal muscle significantly disrupted calcium release and SOCE.
  • Ultrastructural changes in the mitochondria of affected fibers suggest that mitochondrial defects and impaired calcium handling may contribute to muscle weakness and degeneration linked to age and neuromuscular junction loss.
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Background: Astaxanthin (AX) a marine carotenoid is a powerful natural antioxidant which protects against oxidative stress and improves muscle performance. Retinol and its derivatives were described to affect lipid and energy metabolism. Up to date, the effects of AX and retinol on excitation-contraction coupling (ECC) in skeletal muscle are poorly described.

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