Baicalein attenuates oxidant stress in cardiomyocytes

Zuo Hui Shao, Terry L. Vanden Hoek, Yimin Qin, Lance B. Becker, Paul T. Schumacker, Chang Qing Li, Lucy Dey, Eugene Barth, Howard Halpern, Gerald M. Rosen, Chun Su Yuan*

*Corresponding author for this work

Research output: Contribution to journalArticle

137 Scopus citations

Abstract

Flavonoids within Scutellaria baicalensis may be potent antioxidants on the basis of our studies of S. baicalensis extract. To further this work, we studied the antioxidative effects of baicalein, a flavonoid component of S. baicalensis, in a chick cardiomyocyte model of reactive oxygen species (ROS) generation during hypoxia, simulated ischemia-reperfusion, or mitochondrial complex III inhibition with antimycin A. Oxidant stress was measured by oxidation of the intracellular probes 2′,7′-dichlorofluorescin diacetate and dihydroethidium. Viability was assessed by propidium iodide uptake. Baicalein attenuated oxidant stress during all conditions studied and acted within minutes of treatment. For example, baicalein given only at reperfusion dose dependently attenuated the ROS burst at 5 min after 1 h of simulated ischemia. It also decreased subsequent cell death at 3 h of reperfusion from 52.3 ± 2.5% in untreated cells to 29.4 ± 3.0% (with return of contractions; P < 0.001). In vitro studies using electron paramagnetic resonance spectroscopy with the spin trap 5-methoxycarbonyl-5-methyl-1-pyrroline-N-oxide revealed that baicalein scavenges superoxide but does not mimic the effects of superoxide dismutase. We conclude that baicalein can scavenge ROS generation in cardiomyocytes and that it protects against cell death in an ischemia-reperfusion model when given only at reperfusion.

Original languageEnglish (US)
Pages (from-to)H999-H1006
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume282
Issue number3 51-3
DOIs
StatePublished - 2002

Keywords

  • 2′,7′-dichlorofluorescin diacetate
  • Antimycin A
  • Dihydroethidium
  • Ischemia
  • Mitochondria
  • Reactive oxygen species
  • Scutellaria baicalensis

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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  • Cite this

    Shao, Z. H., Vanden Hoek, T. L., Qin, Y., Becker, L. B., Schumacker, P. T., Li, C. Q., Dey, L., Barth, E., Halpern, H., Rosen, G. M., & Yuan, C. S. (2002). Baicalein attenuates oxidant stress in cardiomyocytes. American Journal of Physiology - Heart and Circulatory Physiology, 282(3 51-3), H999-H1006. https://doi.org/10.1152/ajpheart.00163.2001