title: Comparative pharmacokinetic investigation on baicalin and wogonoside in type 2 diabetic and normal rats after oral administration of traditional Chinese medicine Huanglian Jiedu decoction.
abstract: BACKGROUND
  Huanglian Jiedu decoction (HLJDD) is used traditionally in China for the treatment of diabetes mellitus in clinical practice, which has been proved to be effective. The purpose of this study was to investigate the pharmacokinetic characteristics (especially the area under the curve, AUC) of baicalin and wogonoside in type 2 diabetic rats after oral administration of HLJDD extract and to explore its possible mechanism.
  
  
  METHODS
  HLJDD extract and Radix scutellariae extract were prepared and the contents of baicalin and wogonoside contained in two extracts were assayed with high performance liquid chromatography (HPLC). Type 2 diabetic rats were induced by high fat diet and intraperitoneal injection of streptozotocin. Pharmacokinetics of baicalin and wogonoside in type 2 diabetic and normal control rats after oral administration of HLJDD extract or Radix scutellariae extract were investigated. Pharmacokinetics of baicalin in type 2 diabetic and normal rats after oral administration of pure baicalin was also investigated.
  
  
  RESULTS
  The pharmacokinetic parameters (especially AUCs) of baicalin and wogonoside in type 2 diabetic rats after oral administration of HLJDD extract were remarkably different from those in normal rats. And the alterations of the AUCs of baicalin and wogonoside in type 2 diabetic rats after oral administration of Radix scutellariae extract were similar to those after oral administration of HLJDD extract. Moreover, the increase of the AUC of baicalin in type 2 diabetic rats after oral administration of pure baicalin was similar to that after oral administration of HLJDD extract or Radix scutellariae extract.
  
  
  CONCLUSIONS
  The pharmacokinetic behaviors of baicalin and wogonoside (especially the systemic exposure [AUCs] of baicalin and wogonoside) were significantly altered in type 2 diabetic rats after orally administrated HLJDD extract. And the increased AUCs of baicalin and wogonoside in type 2 diabetic rats after oral administration of HLJDD extract resulted from neither the effects of other herbs contained in HLJDD nor the effects of other components contained in Radix scutellariae. It might result from the effects of the pathological status of type 2 diabetes mellitus.
authors.affiliation: Department of Pharmaceutical Science, Medical College of Hunan Normal University, Changsha 410013, PR China.
authors.forename: Meng-Yun
authors.initials: MY
authors.lastname: He
authors.affiliation: Department of Pharmaceutical Science, Medical College of Hunan Normal University, Changsha 410013, PR China. Electronic address: dyxdjy@126.com.
authors.forename: Yuan-Xiong
authors.initials: YX
authors.lastname: Deng
authors.affiliation: Department of Pharmaceutical Science, Medical College of Hunan Normal University, Changsha 410013, PR China.
authors.forename: Qun-Zhi
authors.initials: QZ
authors.lastname: Shi
authors.affiliation: Department of Pharmaceutical Science, Medical College of Hunan Normal University, Changsha 410013, PR China.
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Zhang
authors.affiliation: Department of Pharmaceutical Science, Medical College of Hunan Normal University, Changsha 410013, PR China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Lv
mesh_terms: D000284:Administration, Oral; D000818:Animals; D019540:Area Under Curve; D002851:Chromatography, High Pressure Liquid; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy; D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000494:pharmacology*; D044950:Flavanones / Q000302:isolation & purification / Q000493:pharmacokinetics*; D005419:Flavonoids / Q000302:isolation & purification / Q000493:pharmacokinetics*; D005960:Glucosides / Q000302:isolation & purification / Q000493:pharmacokinetics*; D000960:Hypolipidemic Agents / Q000302:isolation & purification / Q000493:pharmacokinetics*; D008297:Male; D008516:Medicine, Chinese Traditional; D010936:Plant Extracts / Q000737:chemistry / Q000493:pharmacokinetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D031364:Scutellaria baicalensis / Q000737:chemistry
chemical_list: D004365:Drugs, Chinese Herbal; D044950:Flavanones; D005419:Flavonoids; D005960:Glucosides; D000960:Hypolipidemic Agents; D010936:Plant Extracts; C061676:oren gedoku to; C038044:baicalin; C473995:wogonoside
keywords: Baicalin; Huanglian Jiedu decoction (HLJDD); Pharmacokinetics; Radix scutellariae (Scutellaria baicalensis georgi).; Type 2 diabetes; Wogonoside