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Molecular Medicine

, Volume 18, Issue 2, pp 209–214 | Cite as

Resveratrol Improves Cardiac Contractility following Trauma-Hemorrhage by Modulating Sirt1

  • Bixi Jian
  • Shaolong Yang
  • Irshad H. Chaudry
  • Raghavan Raju
Research Article

Abstract

Mitochondria play a critical role in metabolic homeostasis of a cell. Our recent studies, based on the reported interrelationship between c-Myc and Sirt1 (mammalian orthologue of yeast sir2 [silent information regulator 2]) expression and their role in mitochondrial biogenesis and function, demonstrated a significant downregulation of Sirt1 protein expression and an upregulation of c-Myc following trauma-hemorrhage (T-H). Activators of Sirt1 are known to improve mitochondrial function and the naturally occurring polyphenol resveratrol (RSV) has been shown to significantly increase Sirt1 activity by increasing its affinity to both NAD+ and the acetylated substrate. In this study we tested the salutary effect of RSV following T-H and its influence on Sirt1 expression. Rats were subjected to T-H or sham operation. RSV (8 mg/kg body weight, intravenously) or vehicle was administered 10 min after the onset of resuscitation, and the rats were killed 2 h following resuscitation. Sirtinol, a Sirt1 inhibitor, was administered 5 min prior to RSV administration. Cardiac contractility (±dP/dt) was measured and heart tissue was tested for Sirt1, Pgc-1α, c-Myc, cytosolic cytochrome C expression and ATP level. Left ventricular function, after T-H, was improved (P < 0.05) following RSV treatment, with significantly elevated expression of Sirt1 (P < 0.05) and Pgc-1α (P < 0.05), and decreased c-Myc (P < 0.05). We also observed significantly higher cardiac ATP content, declined cytosolic cytochrome C and decreased plasma tumor necrosis factor-α in the T-H-RSV group. The salutary effect due to RSV was abolished by sirtinol, indicating a Sirtl-mediated effect. We conclude that RSV may be a useful adjunct to resuscitation fluid following T-H.

Notes

Acknowledgments

The study was supported by NIH grants AG 031440 (R Raju), GM R01 39519 (IH Chaudry) and a University of Alabama HSF-GEF Scholar Award (R Raju).

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Authors and Affiliations

  • Bixi Jian
    • 1
  • Shaolong Yang
    • 1
  • Irshad H. Chaudry
    • 1
    • 2
    • 3
  • Raghavan Raju
    • 1
    • 2
    • 3
  1. 1.Center for Surgical Research, Department of Surgery, VH-G094, Volker HallUniversity of Alabama at BirminghamBirminghamUSA
  2. 2.Department of MicrobiologyUniversity of Alabama at BirminghamBirminghamUSA
  3. 3.Center for Cardiovascular BiologyUniversity of Alabama at BirminghamBirminghamUSA

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