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《China Journal of Chinese Materia Medica》 2013-08
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Pharmacokinetic/pharmacodynamic modeling of antipyretic and reducing plasma concentration of NO effects of Rheum palmatum in rat

LI Hong,ZHANG Yan,YU Yi-ping,WANG Ping*,LI Fan-fan,MENG Xian-li(College of Pharmacy,Chengdu University of Traditional Chinese Medicine,Chengdu 611137,China)  
Pharmacokinetic-pharmacodynamic(PK-PD) modeling was used to characterize the antipyretic and anti-inflammatory effects in rats of Rhein,a major component in rhubarb.Twenty-four healthy male Sprague-Dawley(SD) rats were randomly into four groups,of 6 each.The rats in first group were injected intravenously with lipopolysaccharide(LPS,100 μg·kg-1).The second group rats were given rhubarb decoction(RD,1.54 g·kg-1) by oral administration alone.The rats belonging to third group were administered orally RD 30min after LPS injection.The rest rats were given normal saline only as control group.Orbital sinus blood sampling was collected at different time points.The Rhein and NO concentration in plasma and body temperature(BT) were measured.Relevant data of PK-PD modeling were performed with Kinetica 5.0.11.RD could suppress the rise in BT and plasma NO concentration.The antipyretic and anti-inflammatory responses were best described by a Sigmod-Emax model.Delay between exposure and response was accounted for by a transit compartment model with two parallel transit compartment chains.The results showed that some parameters such as t1/2,Cmax and AUC were significantly increased in rats treated with LPS,compared to those in rats treated with normal saline.The EC50 for antipyretic effect and decrease of plasma NO concentration was respectively equal to 114.1,90.80 μg·L-1.The Emax for antipyretic effect was about 111% of that for increase in BT after LPS injection.The Emax for anti-inflammatory action was close to 8.399% of that for elevated NO level after modeling.Meanwhile,there was a difference in pharmacokinetic process of Rhein between the impact of normal saline and LPS.So,it can be concluded that the targets of regulating NO production and BT after RD administration may be at the same location.Not only do that,the antipyretic effect induced by RD maybe completely manifest through reducing the plasma concentration of NO.
【Fund】: 国家自然科学基金项目(81073118 8100168);; 四川省教育厅自然基金重点项目(11ZA061)
【CateGory Index】: R285
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