Chronotropic effect of the methanolic extracts of the plants of the Paris species and steroidal glycosides isolated from P. vietnamensis on spontaneous beating of myocardial cells.
Rhizomes of five identified plants of the Paris species, Liliaceae, and Rhizoma Paridis which are sold as a crude drug named "Zao Xiu," "Qiyeyizhihua" or other names in nine different markets in China were tested for their effects on cultured cardiomyocytes. In the standard medium, eight methanol extracts out of sixteen at a concentration of 0.2 mg/ml stopped the spontaneous beating of myocardial cell sheets, but these extracts significantly increased the beating rate when the concentration was reduced to one half. In the culture medium with a low calcium concentration, 0.5 mM, the beating rate of the cells decreased to about 60% of that of the control in the standard medium. The addition of five of the extracts to the low calcium medium at a concentration of 0.1 mg/ml caused a stop of cell beating, but the other extracts increased beating rate at least by 10%. These steroidal glycosides isolated from the rhyzomes of P. vietnamensis (Takht.) H. Li also stimulated cell beating. Among them, diosgenin-3)-alpha-L-rhamno-pyranosyl-(1---2)-(alpha-L-arabinofura nosyl-(1---4))-D-glucopranoside (compound 1) was the most effective stimulant for cell beating as well as calcium uptake by the myocardial cells.
Nambu
T
T
Huang
X
X
Shu
Y
Y
Huang
S
S
Hattori
M
M
Kakiuchi
N
N
Wang
Q
Q
Xu
G J
GJ
D000818:Animals; D002118:Calcium / Q000378:metabolism; D002301:Cardiac Glycosides / Q000302:isolation & purification; D002478:Cells, Cultured; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D015394:Molecular Structure; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
D002301:Cardiac Glycosides; D004365:Drugs, Chinese Herbal; D000254:Sodium-Potassium-Exchanging ATPase; D002118:Calcium