title: Effect of kanglaite on rat cytochrome P450.
abstract: BACKGROUND
  Kanglaite (KLT) is an oily substance extracted from Coix lacryma-jobi Linn. (Cramineae) and has been proved to significantly improve the life span and quality of life of patients, when combined with chemotherapy, radiotherapy, or surgery.
  
  
  OBJECTIVE
  The purpose of this study was to find out whether KLT influences the effect on rat cytochrome P450 (CYP) enzymes (CYP1A2, CYP2B6, CYP2C9, CYP2C19, and CYP3A4) by using cocktail probe drugs in vivo.
  
  
  METHODS
  A cocktail solution at a dose of 5 mL/kg, which contained phenacetin (20 mg/kg), bupropion (20 mg/kg), tolbutamide (5 mg/kg), omeprazole (20 mg/kg), and midazolam (10 mg/kg), was given as oral administration to rats treated with 7 d intraperitoneal injection of KLT. Blood samples were collected at a series of time-points and the concentrations of probe drugs in plasma were determined by HPLC-MS/MS. The corresponding pharmacokinetic parameters were calculated by the software of DAS 2.0 (SPPS Inc., Chicago, IL).
  
  
  RESULTS
  In the experiment, there was a statistically significant difference in the t1/2, Cmax, AUC(0-∞), and CL for phenacetin, bupropion, tolbutamide, omeprazole, and midazolam. Our study showed that treatment with multiple doses of KLT had induction effect on rat CYP1A2, while CYP2B6, CYP2C9, CYP2C19, and CYP3A4 enzyme activities had been inhibited after multiple doses of KLT treatment.
  
  
  CONCLUSIONS
  KLT can either induce or inhibit activities of CYP. Therefore, caution is needed when KLT is co-administration with some CYP substrates in clinic, which may result in herb-drug interactions.
authors.affiliation: The First Affiliated Hospital of Wenzhou Medical University , Wenzhou , China and.
authors.forename: Xiaoxiang
authors.initials: X
authors.lastname: Du
authors.forename: Huizhou
authors.initials: H
authors.lastname: Ye
authors.forename: Chunxia
authors.initials: C
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Ye
authors.forename: Guanyang
authors.initials: G
authors.lastname: Lin
mesh_terms: D000818:Animals; D031742:Coix; D065693:Cytochrome P-450 Enzyme Inducers / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D065607:Cytochrome P-450 Enzyme Inhibitors / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004365:Drugs, Chinese Herbal / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D041743:Herb-Drug Interactions / Q000502:physiology; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D065693:Cytochrome P-450 Enzyme Inducers; D065607:Cytochrome P-450 Enzyme Inhibitors; D004365:Drugs, Chinese Herbal; D003577:Cytochrome P-450 Enzyme System; C499781:kang-lai-te
keywords: CYP; KLT; interaction