Ginkgo biloba extract EGB761 protects against aging-associated diastolic dysfunction in cardiomyocytes of D-galactose-induced aging rat

Oxid Med Cell Longev. 2012:2012:418748. doi: 10.1155/2012/418748. Epub 2012 May 29.

Abstract

The aim of the present study was to make use of the artificially induced aging model cardiomyocytes to further investigate potential anti-aging-associated cellular diastolic dysfunction effects of EGB761 and explore underlying molecular mechanisms. Cultured rat primary cardiomyocytes were treated with either D-galactose or D-galactose combined with EGB761 for 48 h. After treatment, the percentage of cells positive for SA-β-gal, AGEs production, cardiac sarcoplasmic reticulum calcium pump (SERCA) activity, the myocardial sarcoplasmic reticulum calcium uptake, and relative protein levels were measured. Our results demonstrated that in vitro stimulation with D-galactose induced AGEs production. The addition of EGB761 significantly decreased the number of cells positive for SA-β-gal. Furthermore, decreased diastolic [Ca(2+)](i), curtailment of the time from the maximum concentration of Ca(2+) to the baseline level and increased reuptake of Ca(2+) stores in the SR were also observed. In addition, the level of p-Ser16-PLN protein as well as SERCA was markedly increased. The study indicated that EGb761 alleviates formation of AGEs products on SERCA2a in order to mitigate myocardial stiffness on one hand; on other hand, improve SERCA2a function through increase the amount of Ser16 sites PLN phosphorylation, which two hands finally led to ameliorate diastolic dysfunction of aging cardiomyocytes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aging*
  • Animals
  • Calcium / metabolism
  • Calcium-Binding Proteins / metabolism
  • Cells, Cultured
  • Galactose / toxicity
  • Ginkgo biloba / chemistry*
  • Glycation End Products, Advanced / metabolism
  • Myocardium / metabolism
  • Myocytes, Cardiac / cytology
  • Myocytes, Cardiac / drug effects*
  • Myocytes, Cardiac / metabolism
  • Plant Extracts / chemistry
  • Plant Extracts / pharmacology*
  • Rats
  • Sarcoplasmic Reticulum Calcium-Transporting ATPases / metabolism

Substances

  • Calcium-Binding Proteins
  • Glycation End Products, Advanced
  • Plant Extracts
  • phospholamban
  • Ginkgo biloba extract
  • Sarcoplasmic Reticulum Calcium-Transporting ATPases
  • Calcium
  • Galactose