Effects of cleistanthins A and B on blood pressure and electrocardiogram in Wistar rats

Z Naturforsch C J Biosci. Nov-Dec 2011;66(11-12):581-7. doi: 10.1515/znc-2011-11-1207.

Abstract

We have studied the effects of cleistanthin A and cleistanthin B, phytoconstituents isolated from the leaves of Cleistanthus collinus Roxb. (Euphorbiaceae), on blood pressure, electrocardiogram, and barium chloride-induced arrhythmia in Wistar rats. The two compounds were isolated by column chromatography and their identity was confirmed spectroscopically. A healthy, male Wistar rat was used to record the invasive blood pressure and electrocardiograph. The antiarrhythmic effects of cleistanthins A and B were studied using the barium chloride model. Both cleistanthin A and cleistanthin B showed a dose-dependent hypotensive effect. Both compounds reduced the mean blood pressure significantly although the dose required for the effect was higher in the case of cleistanthin B. In the electrocardiogram, cleistanthins A and B significantly altered the electrical activity of the heart, the changes were transient and of no further consequence. Intravenous injection of 64 microg or more of cleistanthins A and B caused a sudden respiratory depression without affecting the electrocardiogram. Cleistanthins A and B did not display any antiarrhythmic effect against barium chloride-induced arrhythmia. In conclusion, both cleistanthin A and cleistanthin B exert a hypotensive effect and have no antiarrhythmic effect against barium chloride-induced arrhythmia in Wistar rats.

MeSH terms

  • Animals
  • Blood Pressure / drug effects*
  • Electrocardiography
  • Glucosides / pharmacology*
  • Glycosides / pharmacology*
  • Lignans / pharmacology*
  • Male
  • Rats
  • Rats, Wistar

Substances

  • Glucosides
  • Glycosides
  • Lignans
  • cleistanthin
  • cleistanthin B