Objective To investigate the influence of selective HGF/cMet inhibitor-NK-4 against colon(cancer) and reveal the potential signaling pathway mechanism of NK-4 effect on colon cancer cell.Methods LoVo colon cancer cells were treated with NK-4(a selective inhibitor of c-Met phosphorylation)at different times.MTT assay and flow cytometry were used to measure cell proliferation and apoptosis.The expression of c-Met,p-c-Met,MEK2,p-ERK and C-myc were measured by Western blot.Results In NK-4-treated group, cells proliferation were inhibited and apoptosis induced in a dose-dependent manner,and resulted in(significant) downregulation of p-c-Met and MEK2/ERK pathway-related protein.The effect of HGF/on LoVo was the opposite.The ratios of p-c-Met,MEK2,p-ERK and C-myc expression between blank group and the NK-4(1?g/mL)-treated for 24h group were 2.58,1.89,1.67 and 2.21(P

AIM: To establish a method to determine the concentration of indinavir in human plasma and study indinavir bioavailability in Chinese healthy people. METHODS: In a random two-period crossover study, 18 healthy male volunteers received a single dose of indinavir capsules 800 mg of two formulations respectively.A sensitive and specific reversed phase HPLC method was developed to quantitate plasma levels of indinavir. The drug was extracted from plasma with acetonitrile. Analysis was performed on a Hy persil C18 column with a mobile phase of acetonitrile:0.01 mol · L -1 phosphate buffer(pH 5.5 ) (43: 57).The UV detector was set at 210 nm. The standard curve covered the concentration ranged from 0. 03 to 16.38 mg · L-1. RESULTS: The concentration-time curves of reference and tested formulations both fitted to a one-compartment open model. The main pharmacokinetic rameters of tested and reference formulations were (10.6 ±s 2.4) mg· L-1 and (9.8 ±2.2)mg· L-1 for cmax, (0. 71 ± 0. 19) h and (0. 8 ±0.3) h for tmax, (1.30±0.24) h and (1.31 ±0.23) h for t1/2ke, (23±6) mg·h· L-1 and (22±5) mg·h · L-1 forAUC0-10, (24±6) mg · h · L-1 and (22±5) mg · h · L-1 for AUC0-∞, respectively. Two one-sidet test and variance analysis were performed in bioequivalent assessment. No statistically significant difference was found in AUC0-10, AUC0-∞ and cmax values between the tested and reference formulations. CONCLUSION:The reversed phase HPLC is a reliable method to determine the concentration of indinavir in human plasma and the two formulations of indinavir are bioequivalent.

OBJECTIVETo study the variations of flavonoids contents in vine tips of sweetpotato (Ipomoea batatas) among different varieties, parts and the time of topping.

METHODThe flavonoid contents in leaf, petiole and stem of vine tips at 6 different topping time of 3 varieties for vegetable-use Pushu 53, Guangcaishu No. 2 and Fushu 7-6, which were collected from Chongqing were determined by UV spectrophotometry with rutin as a standard substance.

RESULTThe results showed that the flavonoid content of Guangcaishu No. 2 was higher than that of Pusu 53, so was that of Pusu 53 than that of Fushu 7-6. The average flavonoid contents in leaf of 3 varieties were between 3.66 mg x L(-1) and 11.09 mg x L(-1) during 6 topping time, and those in petiole, stem were between 2.20-5.26 mg x L(-1) and 4.03-7.79 mg x L(-1), respectively. The rations of average flavonoid contents in leaf, petiole and stem to the total contents of vine tips among 3 varieties during their whole topping periods were 46.71%, 20.65% and 32.63%, respectively. The contents during earlier topping time were higher than those of later periods. The variance analysis of flavonoid contents revealed that there was significant difference between different varieties, parts and time of topping and significant interactions among varieties, parts and time of topping.

CONCLUSIONThe results of the study indicate that the contents of flavonoid should be considered for the breeding, cultivation and industrialization of sweetpotato for vegetable-use.

China ; Flavonoids ; analysis ; Ipomoea batatas ; chemistry ; Plant Extracts ; analysis ; Plant Structures ; chemistry ; Time Factors ; Vegetables ; chemistry