Effect of Fructus Ligustri Lucidi on calcium metabolism and vitamin D-dependent gene expressions in ovariectomized rats
- VernacularTitle:女贞子对去卵巢大鼠钙代谢及维生素D依赖型基因表达的影响
- Author:
Yan ZHANG
- Publication Type:Journal Article
- Keywords:
Fructus Ligustri Lucidi(FLL);
calcium metabolism;
vitamin D;
gene expression;
(ovariectomy)(OVX)
- From:
Chinese Traditional and Herbal Drugs
1994;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of Fructus Ligustri Lucidi(FLL),a kidney-tonifying Chinese herbal medicine,on calcium metabolism and vitamin D-dependent gene expression in ovariectomized(OVX) rats.Methods Four weeks after OVX surgical operation the OVX rats were ig admini-(stered) with estradiol and FLL for 14 weeks.Ca~(2+) Level in serum,urine,and feces was measured by colorimetric methods,and gene expressions in duodenum and kidney were analyzed by reversed transcriptase-polymerase chain reaction(RT-PCR).Results Ovariectomy of rat led to significant loss of calcium in vivo,as demonstrated by decreasing serum Ca~(2+) level and increasing Ca~(2+) excretion rate in urine and feces in OVX rat group.Treatment of OVX rats with FLL could effectively restore serum Ca~(2+) level and prevent the increase of Ca~(2+) excretion from urine and feces.RT-PCR Analysis showed that both estradiol and FLL could prevent OVX-induced decrease of mRNA expression in duodenal vitamin D receptor(VDR).In kidney,FLL did not alter mRNA expressions of 25-hydroxyvitamin D 1-hydroxylase(1-OHase) and 25-hydroxyvitamin D 24-hydroxylase(24-OHase),while increased the mRNA expression levels of renal cal-ciumbinding protein-9k(CaBP-9k) and calcium-binding protein-28k(CaBP-28k).Conclusion FLL could improve the state of calcium imbalance induced by estrogen deficiency and the potential mechanism that contributes to the improvement of calcium status by FLL might involve the increase in intestinal sensitivity to active vitamin D through its up-regulation of VDR expression in duodenum and the enhancement in Ca~(2+) reabsorption via the up-regulation of calcium binding proteins expression in kidney.
