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O-GlcNAc and the cardiovascular system.

Sujith Dassanayaka1, Steven P Jones1

  • 1Institute of Molecular Cardiology, Diabetes and Obesity Center, Division of Cardiovascular Medicine, Department of Medicine, University of Louisville, Louisville, KY, USA; Department of Physiology and Biophysics, University of Louisville, Louisville, KY, USA.

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Protein O-GlcNAcylation, a key metabolic signaling pathway, offers protection against acute cardiovascular stress but contributes to dysfunction in diabetes. Understanding this paradox is crucial for developing new therapies.

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Heart failureHexosamine biosynthetic pathwayHypertrophyIschemia–reperfusion injuryMitochondria

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Area of Science:

  • Cardiovascular Metabolism
  • Post-translational Modifications
  • Molecular Signaling

Background:

  • The cardiovascular system exhibits dynamic adaptations to various stimuli via complex signaling.
  • Protein O-GlcNAcylation (O-GlcNAc) is a crucial post-translational modification impacting cardiovascular pathophysiology.
  • This modification is linked to nutrient availability and cellular stress, influencing key cellular processes.

Purpose of the Study:

  • To review the dual role of O-GlcNAcylation in cardiovascular health and disease.
  • To explore the mechanisms underlying O-GlcNAc-mediated cardioprotection and dysfunction.
  • To discuss potential pharmacological targets and intervention strategies.

Main Methods:

  • Literature review of studies on O-GlcNAcylation in cardiovascular physiology and pathology.
  • Analysis of signaling pathways involving O-GlcNAc and its interplay with other modifications like phosphorylation.
  • Examination of O-GlcNAcylation in models of acute and sustained cardiovascular stress, including diabetes.

Main Results:

  • O-GlcNAcylation acts as an autoprotective mechanism during acute cardiovascular stress (e.g., hypoxia, ischemia).
  • It plays a compensatory role in sustained stress models like pressure overload hypertrophy and heart failure.
  • Conversely, elevated O-GlcNAcylation is implicated in vascular and cardiac dysfunction in Type II diabetes models.

Conclusions:

  • O-GlcNAcylation presents a paradox, offering protection in acute stress while contributing to dysfunction in diabetes.
  • Understanding these contrasting roles is essential for targeted therapeutic interventions.
  • Further research into O-GlcNAc regulatory mechanisms and pharmacologic targets is warranted for cardiovascular disease management.