This study is based on the application of the medical simulator and the multimedia technology to the medical English teaching for overseas students during their clinical practice in surgical department.It shows that this teaching model is effective by delivering a good studying surroundings and various language carriers.

AIM: In order to explore the pathogenesis of ulcerative colitis (UC), an experimental colitis in mouse was induced by the hapten dinitrochlorobenzene (DNCB), and the activity of leukocyte migration inhibitory factor (LMIF) was measured at the same time. METHODS: 67 BALB/c mice were randomly divided into control (60% ethanol) and DNCB groups. After they were sensitized by smearing 3.3% DNCB on the abdominal skin, they were challenged with DNCB at concentration of 0.1%, 0.2% and 0.4% respectively by instillation once a day. The weight, stool viscosity and hematochezia were observed and accumulated as disease active index (DAI) score. The pathological changes in colon tissue were judged macropathologically and by means of microscope. LMIF activity was determined by the absorbance (A) of migrated leukocytes. RESULTS: Compared to control group, the increases in DAI accumulate score, pathologic score, and LMIF activity in DNCB groups were observed. CONCLUSION: Mouse colitis was induced by DNCB, which was accompanied by an increase in LMIF activity. [

Objective To evaluate the safety and efficacy of magnetic resonance-guided focused ultrasound surgery (MRgFUS) in treatment of symptomatic uterine leiomyoma among Chinese reproductive age women.Methods From April 2010 to April 2012,80 premenopausal women with symptomatic leiomyoma volunteered to participate in this prospective study in Department of Outpatient of Peking Union Medical College Hospital.Among 23 reproductive aged patients with size of uterus less than 16th gestational weeks,2.5 to 10 cm of diameter of myoma,less than 10 myomas and expressing symptoms clearly were treated by MRgFUS.Treatment data,non-perfused volume ratio (NPVR) and adverse events were recorded.After treatment,patients were followed up at 1 week,1,3,6,12 and 24 months,respectively.Patients at initial screening and each time of the follow-up filled out uterine fibroid symptoms quality of life (UFS-QOL),which include symptoms severity score (SSS) and health-related quality of life (HRQL).The volumes of leiomyoma and uterine were evaluated on MRI before and after the treatment (at 6 and 12 months,respectively).Before operation,routine blood test were performed on all patients,anemia patients at 3 months and 1 year after treatment were checked with blood test.Results (1) Treatment data and adverse events:the mean therapeutic temperature was (69 ± 7) ℃,the mean treatment time was (144 ±62) min,the mean NPVR was (62 ±23)％.Adverse events included mild erythema(1/23),abdominal cramp(8/23),vaginal discharge (5/23),and leg numbness (4/23).(2) The rate of secondary surgery:one patient was treated by myoectomy and hysterectomy within one year following up and 4 patients chose surgical treatment during the second-year follow-up.(3) Volume change:the volumes of leiomyoma before the treatment and 6,12 months after the treatment are 75.6 (P25 =43.8,P75 =128.9),52.3 (P25 =23.8,P75 =111.2),45.9 (P25 =26.3,P75 =71.7) cm3,respectively; and the volumes of uterine before the treatment and 6,12 months after the treatment are 270.0 (P25 =208.4,P75 =390.3),216.4 (P25 =151.1,P75 =290.0),200.0 (P25 =149.1,P75 =267.6) cm3,respectively.Both leiomyoma and uterine volumes decreased significantly after treatments (P ＜ 0.01).(4) UFS-QOL change:the symptoms severity score (SSS) before the treatment and 3,12 months after the treatment are (34 13),(22 ± 11),(19 ± 12),which decreased significantly (P ＜ 0.01).The health-related quality of life (HRQL) before the treatment and 3,12 months after the treatment are (74 ± 15),(82 ± 13),(89 ± 10),which increased dramatically (P ＜0.01).(5) Hemoglobin(HGB) change:eleven patients suffered from anemia before treatments,the mean HGB before treatment was (87 ±6) g/L and were (106 ± 14) g/L 3 months after treatment,(112 ± 10) g/L 12 months after treatment.The HGB was increased significantly after treatments (P＜0.01).Conclusions MRgFUS is a safe and effective non-invasive management for symptomatic uterine leiomyoma in short-term follow up.But there is additional treatment ratio after MRgFUS.

To study the toxicokinetics of bakuchiol, hepatic and renal toxicity in rats after single oral administration of Psoraleae Fructus and combined with Glycyrrhizae Radix et Rhizoma, in order to provide scientific evidences for clinical safe medication use. A total of 35 SD rats were randomly divided into seven groups: vehicle (distilled water) control group, Glycyrrhizae Radix et Rhizoma group, positive control (aristolochic acid A) group, Psoraleae Fructus (40 g x kg(-1)) group( both male and female rats), Psoraleae Fructus and Glycyrrhizae Radix et Rhizoma (40 +20) g x kg(-1) group (both male and female rats). HPLC-UV method was used to determine the concentration of bakuchiol in rat plasma at different time points after single oral administration. Plasma alanine transaminase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN), plasma creatinine (Cr), N-acetyl-β-D-glucosaminidase (NAG) and kidney injury molecule 1 (Kim-1) were measured after administration for 24 h. The main toxicokinetics parameters of bakuchiol in rats exert significantly gender difference. When Psoraleae Fructus combination with Glycyrrhizae Radix et Rhizoma, the total area under the plasma concentration-time curve( AUC), C(max), and plasma clearance (CL) of bakuchiol were increased, respectively; CL, half-life (t½) were decreased, and T(max) were prolonged. The biochemical indicators (including ALT, AST, BUN, Cr and KIM-1 level) in different dose of Psoraleae Fructus groups, were found no statistically significant difference when compared with vehicle control group. The level of NAG in both Psoraleae Fructus and compatibility with Glycyrrhizae Radix et Rhizoma groups were significant increased (P < 0.05). There are obvious effects on toxicokinetics of bakuchiol in rats when Psoraleae Fructus combined with Glycyrrhizae Radix et Rhizoma. Renal toxicity induced by Psoraleae Fructus at high dose was observed after single oral administration and no liver damage in rats was found.
Administration, Oral ; Animals ; Female ; Glycyrrhiza ; toxicity ; Kidney ; drug effects ; Liver ; drug effects ; Male ; Phenols ; pharmacokinetics ; toxicity ; Psoralea ; toxicity ; Rats ; Rats, Sprague-Dawley ; Rhizome ; toxicity ; Toxicokinetics

AIM: To seek a small interfering RNA ( siRNA ) sequence targeting rat inhibitor of nuclear factor kappa Bα ( IκBα) that can specifically and effectively suppress IκBα mRNA expression of rat ciliary muscles in vivo.METHODS:Three IκBα specific double stranded siRNAs were designed and synthesized. They were transfected into rat A7r5 cells which express IκBα gene. Flow cytometry was used to assess transfected efficiency. The mRNA and protein levels of IκBα were examined by Real Time quantitative polymerase chain reaction ( Real Time-PCR ) and western blot to screen a candidate valid sequence with the highest inhibitory rate. The Cy3 labeled non-specific control siRNA or the candidate valid siRNA was then injected into rat anterior chamber. Distribution of Cy3- siRNA in rat ciliary muscles was viewed by fluorescence microscopy, and the inhibitory effect in vivo of the valid siRNA was identified via Real Time-PCR and immunofluorescence. RESULTS: The suppression effect of the siRNA targeting the CTACGATGACTGTGTGTTT of IκBα gene was most obvious by vitro screening. By anterior chamber injection, this valid siRNA could reach rat ciliary muscles and effectively suppress IκBα gene expression with the highest inhibitory rate of 59. 0% on mRNA level at 24h after RNAi, and 52. 3% on protein level at 72h after RNAi (P<0. 01).CONCLUSION: It proves that the siRNA targeting the CTACGATGACTGTGTGTTT of IκBα gene is the valid sequence to suppress rat IκBα expression of ciliary muscles by RNAi in vivo.

BmK AngM1 is a long-chain scorpion toxin purified from the venom of Buthus martensii Karsch. It has been reported to exhibit evident analgesic effect and low toxicity, and has the potential to be a novel analgesic drug. The BmKAngM1 gene was transformed into Pichiapastoris GS115. Mut+ and Mut(s) recombinant strains were screened by phenotype and Mut+ recombinant strains were used to detect BmK AngMl gene copy number in the real-time PCR. Expression of BmK AngM1 in the Mut+ recombinant strain was compared with that of the Mut(s) recombinant strain with the same single copy of BmK AngM1 gene under the same condition. The results indicated that the transcription level of BmK AngM1 gene in the Mut(s) recombinant strain was 2.7 fold of that in the Mut recombinant strain in the real-time PCR, and the expression of BmK AngM 1 in the Mut(s) recombinant strain was 1.5 fold of that in the Mut+ recombinant strain. Therefore, Mut(s) recombinant strain showed better ability to express BmK AngM1 than Mut+ recombinant strain.
Animals ; Arthropod Proteins ; biosynthesis ; Gene Dosage ; Pichia ; metabolism ; Recombinant Proteins ; biosynthesis ; Scorpion Venoms ; chemistry

Objective To investigate the clinicopathological features of recurrent and de novo focal segmental glomerulosclerosis (FSGS) after kidney transplantation. Methods Thirty-four recipients pathologically diagnosed with FSGS by renal allograft biopsy were enrolled in this clinical trial. According to the detection of primary diseases of renal allografts and circulating permeability factors, 34 recipients were divided into the recurrent FSGS group (n=12) and de novo FSGS group (n=22). The differences of clinical indexes and the degree of pathological injury of renal allografts were compared between two groups. Results There was no significant difference in the mesangial hyperplasia score, glomerulosclerosis rate, renal tubular atrophy score, interstitial fibrosis score and podocyte proliferation rate between two groups (all P > 0.05). In the recurrent FSGS group, segmental glomerulosclerosis rate of the recipients was 0.10 (0.08, 0.27), lower than 0.19 (0.13, 0.33) in the de novo FSGS group (P < 0.05). No significant difference was found in the incidence of antibody-mediated rejection, drug-induced renal tubular injury and BK virus infection between two groups (all P > 0.05). The incidence of T cell-mediated rejection in the recurrent FSGS group was 17%, lower than 55% in the de novo FSGS group (P < 0.05). Immunohistochemical staining showed that the infiltrating inflammatory cells in the renal allografts were mainly T lymphocytes. The positive rates of C4d deposition in peripheral capillaries between the recurrent and de novo FSGS groups were 33% (4/12) and 32% (7/22), with no significant difference (P > 0.05). Immunofluorescence results revealed IgM deposition in the segmental glomerulosclerosis area of renal allografts in most cases. Electron microscopy showed extensive fusion or segmental distribution of podocytes in the glomerulus of renal allografts. Conclusions The degree of renal functional injury and the incidence of T cell-mediated rejection in the recurrent FSGS group are lower than those in the de novo FSGS group. Comprehensive analysis of preoperative and postoperative clinical manifestations, laboratory testing and pathological examination of kidney transplant recipients contribute to early diagnosis and treatment of recurrent and de novo FSGS.

A cobalt nanoparticles modified ITO electrode (NpCo/ITO) was prepared by casting cobalt nanoparticles onto ITO electrode and the cobalt nanoparticles were synthesized by NaHB4 reduction. The electrochemical behaviors of adriamycin (ADM) on NpCo/ITO were studied. The modified ITO electrode was characterized by cyclic voltammetry (CV), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). In a 0.01 mol L(-1) PBS (pH 8.0) buffer solution, a sensitive reduction peak of ADM was obtained. A linear relationship is held between the peak current and ADM concentration in the range of 1.0 x 10(-8) - 2.0 x 10(-6) mol L(-1) with detection of 5.0 x 10(-9) mol L(-1)- by cyclic voltammetry (CV) response. The reduction process was irreversible with adsorption at the NpCo/ITO electrode. The modified electrode showed an excellent electrocatalytic activity for the ADM electrochemical reduction.
Antineoplastic Agents ; chemistry ; pharmacology ; Clinical Laboratory Techniques ; Cobalt ; chemistry ; Doxorubicin ; chemistry ; pharmacology ; Electrochemistry ; Electrodes ; trends ; Nanoparticles ; chemistry

OBJECTIVETo synthesize and characterize paclitaxel (PTX)-loaded folate-conjugated chitosan (FA-CTS/PTX) nanoparticles and evaluate its cytotoxicity in vitro.

METHODSCTS/PTX and FA-CTS/PTX nanoparticles were prepared using reductive amidation and ionic gelation of chitosan with tripolyphosphate anions (TPP). The particle size was determined by laser scattering and the morphology observed using transmission electron microscopy, and the PTX content in the nanoparticles was determined using ultraviolet spectrophotometer at 227 nm. The in vitro cytotoxicity of the nanoparticles against HeLa cells was evaluated by MTT assay. Fluorescence microscopy was used to observe the HeLa cells incubated with FA-chitosan nanoparticles in the presence or absence of folic acid in the culture medium.

RESULTSPTX loading did not cause adhesion of the FA-CTS nanoparticles, which presented with uniform spherical morphology with an average diameter of 282.8 nm. The loading and encapsulation efficiencies of FA-CTS/PTX were 9.0% and 75.4%, respectively. The FA-CTS nanoparticles showed a greater extent of intracellular uptake in the absence of folic acid, indicating that the cellular uptake of the nanoparticles occurred through endocytosis mediated by the folate receptors. The PTX-loaded FA-CTS nanoparticles exhibited potent cytotoxicity against HeLa cells, an effect 2- to 3-fold stronger than that of PTX-loaded CTS nanoparticles.

CONCLUSIONFA-CTS can be a promising drug carrier with high efficiency in condensing drug, good tumor-targeting ability and low cytotoxicity.

Antineoplastic Agents ; chemistry ; Chitosan ; chemistry ; Drug Carriers ; Drug Compounding ; Folic Acid ; administration & dosage ; HeLa Cells ; Humans ; Nanoparticles ; chemistry

OBJECTIVETo analyze the relationship between high-performance liquid chromatography (HPLC) fingerprints of the chloroform extract fractions of Peucedanum harrysmithii var. subglabrum (PHS) and its phlegm-reducing effect, in order to establish "active component group for reducing phlegm".

METHODHPLC was adopted to determine and analyze HPLC fingerprints of chloroform extract fractions of PHS. Phenol red expectorant experiment was used to observe the phlegm-reducing effect in mice. Mice were administered intragastrically with chloroform extract fractions for 6 days (1.4 g x kg(-1)), with acute bronchitis syrup as the positive control drug (12 mL x kg(-1)). The phenol red secretion in mice was determined by spectrophotometer. Then the grey relational analysis was used to study the spectrum-effect relationship.

RESULTThe phlegm-reducing effect of the chloroform extract fractions of PHS were resulted from the combined effect of all of its chemical components. Its various characteristic peaks represented different chemical components, and the order of their contributions to the phlegm-reducing effect was (number of peaks) 13 > 12 > 16 > 18 > 19 > 6 > 20 > 14 > 1 > 11 > 15 > 10 > 17 > 2 > 5 > 4 > 7 > 3 > 8 > 9, in No. 1, 3, 4, 10, 13 and 16 characteristic peaks were identified as marmesin, psoralen, xanthotoxin, Pd-Ib, pteryxin and peuformosin.

CONCLUSIONThe chloroform extract fractions of PHS show strongly phlegm-reducing effect. There may be certain relationship between their HPLC fingerprint and phlegm-reducing effect.

Chromatography, High Pressure Liquid ; Drugs, Chinese Herbal ; chemistry ; pharmacology ; Ferns ; chemistry ; Mucus ; drug effects