ABSTRACT
Objective To investigate the vasodilatation effects of total flavonoid from polygonum aviculare on rat thoracic aorta and its underlying mechanisms. Methods Total flavonoid from polygonum aviculare was gotten by extracted with 65% alcohol, gathered with polyamide, and eluted with 75% alcohol.The content of flavone was determined with rutoside as standard preparation. Normal rats thoracic aorta in vitro used as sample, BL-420E biological functional experiment system was utilized to record dilatation effect of total flavonoid on PE affecting pre-contracting blood vessel and the relation between dilatation effect of total flavonoid on blood vessel and calcium influx. Results Total flavonoids from polygonum aviculare can diastole contractions of thoracic aorta caused by PE. In calcium-free perfusion, gradually adding CaCl2 induced calcium influx. Clinical data showed dose-effect relation between drug and blood vessel contraction decreased in the total flavonoids from polygonum aviculare incubation rats than normal rats. Besides, total flavonoids from polygonum aviculare can obviously inhibit contraction of blood vascular circle induced by calcium releasing.Conclusion FP exerted a dose-dependent vasodilatation effect on rat isolated aorta rings by inhibiting Ca2+influx via L-type voltage-gated Ca2+ channels and Ca2+ release from sarcoplasmic reticulum, consequently decrease Ca2+ in vascular smooth muscle cells.
ABSTRACT
OBJECTIVE:To observe the inhibitory effect of phenolicalkaloids of menispermum dauricum(PAMD)on the human pancreatic cell line(BXPC-3)tumor and study the effect of PAMD on serum content of inducible nitric oxide synthase(iNOS)in tumor-bearing mice.METHODS:The BXPC-3 tumor-bearing mice model was established,and the model mice were randomly assigned to 6 groups:model control group,blank control group,cyclophosphamide group,3 PAMD groups(high,medium and low dosages).The blank control group was not inoculated with tumor strain but given same volume of normal saline.The tumor-inhibition ratio of PAMD was detected and the content of iNOS of in peripheral blood of tumor-bearing mice was determined by fluorospectrophotometry.RESULTS:PAMD(high,medium and low dosages)showed marked inhibitory effect on tumor growth of BXPC-3 cell line in tumor-bearing mice,with the inhibition ratios at 34.91%,52.83% and 41.51%,respectively.As compared with model control group,PAMD-treated groups showed significantly lower content of iNOS in peripheral blood of tumor-bearing mice.CONCLUSION:PAMD showed marked inhibitory effect on tumor growth of BXPC-3 cell line in tumor-bearing mice,which might be attributed to the lowered content of iNOS.