Aim To study the inhibition of glutathione-S-transferase by dihydromyricetin and its kinetics analysis in liver of mice.Methods Mouse liver cytochyma enzyme was obtained by different velocity centrifugation,the mouse liver glutathione-S-transferase of michaelis constant(Km),maximum velocity(Vmax)and the inhibition of glutathione-S-transferase by dihydromyricetin of 50% inhibiting concentration(IC50),inhibition constant(Ki),the type of inhibition were calculated by Lineweaver-Burk and the low of semi-effect-probit.Results It was found that dihydromyricetin inhibited the glutathione-S-transferase activity with an IC50 of(121.14?13.66)?mol?L~-1.Kinetics analysis showed the Km was 0.1460 mmol?L~-1 and Vmax was 175.44 U?mg~-1 for reduced glutathione(GSH)substrate and 0.0937 mmol?L~-1(Km)and 212.77 U?mg~-1(Vmax)for 1-chloro-2,4,-dinitrobenzene(CDNB)substrate.Kinetics studies of dihydromyricetin on glutathione-S-transferase showed the inhibition was competitive with GSH and noncompetitive with CDNB,and the inhibition constant was 0.22 mmol?L~-1 with GSH and 0.54 mmol?L~1 with CDNB.Conclusion Dihydromyricetin can inhibit the glutathione-S-transferase activity in liver of mice.

Objective To establish a HPLC method for the determination of the content of emodin and chrysophanol in Cigu Xiaozhi pill.Methods The chromatographic procedure was carried out in Symmetry C18(4.6 mm?150 mm,5.0 ?m) column with methanol-0.1% phosphoric acid(85∶15) as the mobile phase,flow rate was 0.8 mL/min,column temperature was 20 ?C,and the detection wavelength was 423 nm.Results Emodin and chrysophanol were well separated with other components.The standard curves of emodin and chrysophanol showed linearity in the range of 0.25～0.75 ?g.The average recoveries were 101.35%(RSD=2.26%) and 98.66%(RSD=1.74%) respectively.Conclusion The method is sensitive,simple and accurate,and can be used for the determination of emodin and chrysophanol in Cigu Xiaozhi pill.

Aim To evaluate the value of expressions of CD63 on basophils in diagnosing allergy to penicillins.Methods The expressions of CD63 on basophils activated with 9 kinds of antigens(PG:penicillin G,PV:phenoxomethylpenicillin,AMP:ampicillin,AX:amoxicilloyl,6-APA:6-aminopenicillanic acid,PHA:phenylacetic acid,PHOA:phenoxacetic acid,PHPG:N-(?-hydroxyphenyl)glycine,NPG:N-phenylglycine) were detected by FAST(Flow cytometric allergen stimulation test) in 43 patients with penicillins allergy.Eight types of specific IgE and IgG antibodies to penicillins were determinated by RAST and ELISA,respectively.Results The sensitivity and specificity of CD63 used as a marker in patients with penicillins allergy were 65.12% and 93.33%,respectively.Moreover,the sensitivities of CD63 and specific IgE were higher than those of specific IgG in patients with positive skin test(P

Objective To establish an RP-HPLC method for the determination of the content of safflor yellow A in Zhanjing Tinctura. Methods The chromatographic procedure was carried out in Symmetry C18 column(4.6mm?150 mm,5.0?m)with methanol-water-glacial acetic acid(7:93∶2)as the mobile phase,pH=2.80. The flow rate was 1.0 mL?min-1,column temperature was 20℃,and the detection wavelength was 402 nm. Results Safflor yellow A was well separated from other components. The standard curves of safflor yellow A showed linearity in the range of 0.096～0.960?g (r=0.9999). The average recovery was 98.80% with RSD being 2.95%(n=9). Conclusion This method is sensitive,simple and accurate,and can be used for the determination of safflor yellow A in Zhanjing Tinctura.

Objective To investigate the reversal of the multidrug resistant gene mdr1 in vivo by antisense oligodeoxynucleotide (ASODN) on the basis of study in vitro. Methods The cultured drug-resistant human hepatocellular carcinoma cells were injected under the skin of axilla to establish the tumor model of nude mice. mdr1 ASODN accompanied by Lipofectamine were injected locally and ADM was injected intraperitoneally. Control 1 and control 2 were locally injected by Lipofectamine and normal saline separately, and ADM was also injected intraperitoneally. Results As time went on the tumor size increased and from the 5th day on alterations were marked, tumor size in different time phase showed marked difference to the prior time phase with significant difference (P 0.05). The results suggested that SODN and Lipofectamine showed no marked effect on tumor growth of nude mice and ASODN had marked inhibition effect on tumor growth.Conclusion mdr1 ASODN can also reverse multidrug resistance of drug-resistant human hepatocellular carcinoma cells in vivo. After the treatment the tumor’s growth in nude mice will slow down in a range of time.

Objective To investigate the mechanism of contralateral testicle spermatogenesis impairment following unilateral testicular torsion in rats.Methods Healthy male Sprague-Dawley rats(n=24) were randomly divided into 3 groups:group 1(sham-operation),2 and 3,each comprising 8 rats.Under surgical conditions,the left testes of the rats in groups 2 and 3 were rotated through clockwise 720? torsion,then detorsion after 12 h or 24 h,respectively.The contralateral testes were harvested after 1 month and the relative proportions of germ cells were measured by the flow cytometry(FCM).Anti-rat immunoglobulin G(IgG)antibodies against spermatozoa antigens were detected in contralateral testicular tissue by immunohistochemical method.Results In groups 1,2 and 3,the weight of contralateral testis was(1555.73?(72.34)),(1184.20?101.02) and(783.60?117.93)mg,respectively;the number of apoptotic cells was 53.25?8.61,1622.00?129.31 and 3401.25?179.75,respectively;the positive rates of antisperm antibodies were 0,0.55?0.02 and 0.69?0.03,respectively.There were significant differences in above parameters between groups(P

Objective To study the relationships between clinical and endoscopic findings of children with Henoch-Schoenlein purpura ( HSP). Methods All of the 51 cases with HSP from Aug 2000 to Apr 2004 were checked up by endoscopy, either gastroscopy and/or colonoscopy, and analyzed the relationship between clinical and endoscopic fingings. Results Fifteen out of 51 cases had no prominent changes in endoscopies, and 36 cases had different lesions in gastric, duodenal or colonic mucosa. There were 4 cases presented with simple lesion on stomach mucosa and 7 cases on colonic mucosa; and 25 cases had the lesions presented in gastrie, duodenal and/or colonic mucosa. The main findings in mucosa were exudates, erosion and hemorrhage. Conclusion There are obvious lesions in stomach, duodenum and /or colonic mucosa of HSP in children. Sometimes, these lesions happened before the appearance of skin purpura. There are close relationships between the lesions and the clinical manifestations of HSP in children, and therefore the endoscopic check up of HSP in children has very important significance in early diagnosis.

Objective To observe the effect of RNAi that silences MTA1 gene on invasion and migration of esophageal carcinoma 9706 cells. Methods The siRNA expression vector that silences MTA1 gene was transfected into EC9706 cells by liposome. MTA1 mRNA and protein expressions were detected through quantitative RT-PCR and Western blot, respectively. The invasion and migration of EC9706 cells were evaluated by scrape wound healing assay and cell invasion assay in vitro. Results MTA1 gene expression significantly decreased. The scrape wound of EC9706 cells healed more slowly and the cell population that cut through Matrigel were less in the EC9706 cells transfected with siRNA expression vector than non-transfected EC9706 cells and the EC9706 cells transfected with blank vector (P

Objective To investigate effects of drugs on spermatogenesis following testicular ischemia-reperfusion in rats. Methods Healthy male Sprague-Dawley rats ( n = 32) were randomly divided into four groups, 8 rats in each group. Animals underwent unilateral testicular torsion followed by detorsion after 2 hours. Isotonic saline, pentoxifylline and verapamil were infused into tail vein 15 minutes before detorsion in torsion group, pentoxifylline group and verapamil group. At 24 hours after operation, testicular function was determined measuring germ cell apoptosis using the flow cytometry ( FCM) , and the levels of myeloperoxidase ( MPO) , superoxide dismutase (SOD) and malondialdehyde (MDA) by spectrophotometry. Results Compared with torsion group, the number of apoptotic germ cell and the contents of MDA and MPO were markedly decreased in pentoxifylline group and verapamil group, but the number of haploid and the level of SOD were significantly increased (P