AIM: To study whether mesenchymal stem cells (MSCs) from fetal liver can differentiate into skeletal muscle-like cells. METHODS: MSCs were isolated from C57BL/6J mouse fetal liver and were induced by 5-azacytidine and amphotericin B. Myf5 and myogenin were tested by RT-PCR. Desmin and ?-actin was examined by immunocytochemistry. RESULTS: RT-PCR showed that the treated cells expressed Myf5 and myogenin orderly from 6 hours to 72 hours, while the untreated cells did not. Immunocytochemistry confirmed that these cells were positive for desmin and ?-actin and the positive rate was higher in 7 days than that in 14 days. CONCLUSION: MSCs derived from fetal liver can be induced into skeletal muscle-like cells in vitro.

Purpose:To evaluate the effect, tolerabilily and toxic-side reactions of combined carboplatin and cisplatin with etopside in advanced non-small-cell lung cancer.Methods:From Oct. 1998 to Mar. 2000, 23 cases with advanced non-small-cell lung cancer were treated by combined carboplatin [200 mg/m 2intravenously (IV) on day 1]and Cisplatin ( 30 mg/m 2 IV on day 3～5) and etopside (100mg/m 2 IV on day 1～5) . The treatment was repeated every 3～4 weeks.Results:86 cycles were completed in the whole group. Median cycles was 4. The overall response rate was 43.48%(10/23,PR), the median survival time was 8.2 months, the 1-year survival rate was 32%. Myelosuppression was the main toxicity, The overall response rate was 86.96%(20/23). Conclusions:Our results indicate that combined carboplatin and cisplatin with etopside regimen is effective for advanced non-small-cell lung cancer.

BackgroundThere are a lot of studies about the wound healing charateristics of cornea after SBK with femtosecond laser.In our study,mechanical microkeratome was preferred for corneal flap.We observed the proliferation of keratocytes by investigating the myofibroblast ( MF) activity.Objective The study was to compare the morphologic and histological changes in the cornea after sub-Bowmans keratomileusis ( SBK) with photorefractive keratectomy ( PRK) and laser in situ keratomileusis ( LASIK)by investigating the express of transforming growth factor-β( TGF-β)and α-smooth muscle actin( α-SMA)and to investigate the wound healing characteristiCs of cornea after SBK.MethodsTwenty-seven adult New Zealand white rabbits were randomly assigned into group A,B and C.SBK waa performed on the right eyes of each rabbit in group A,LASIK for group B and PRK for group C.All the left eyes were used as the normal control group.Histological examinations by light microscopy were performed on day 7,1 months,3 months after surgery.The expression of α-SMA and TGF-β and the number of activated MF were assessed by immunohistochemiatry.ResultsIn SBK group,corneal epithelium cells proliferation around the wound was seen and the numbers of active fibroblasts were increased after surgery.The expression of α-SMA or TGF-β around the corneal flap and the corneal 8troma started at day 7 postoperatively and peaked at 1 months and decreaaed around the corneal flap and the corneal 8troma started at day 7 postoperatively and peaked at 1 months and decreaaed t3mnh.TFβep( SBK:t=2.226,2.158,2.330,P＜0.05;PRK:t=4.745,6.524,6.293,P＜O.05).The numbersof activ( SBK:t=2.226,2.158,2.330,P＜O.05;PRK:t=4.745,6.524,6.293,P＜0.05).The numbersof activatedMFs were different fromLASIKstatisticallytoobetweenSBKgroupandPRKgroup ( SBK:t =4.439.5.692,4.175,P＜0.05 ; PRK:t=6.330,6.723,5.267,P＜0.05 ).Theα-SMAand TCF-βexpressionsin SBKgroupwerelessthan PRK group but more thanLASIKgroup( TCF-β:t =4.691,5.527,t =4.399,P＜0.05 ; α-SMA:t =9.637.10.282,8.197,P＜0.05).The numhers of MFs in SBK group was less than PRK group before 3 months and were same at 3 months ( t =5.188,4.529,P＜0.05 ).Conclusions ComparedwithconventionalLASIK,SBKcanup-regulatethe expression of α-SMA.TGF-β,activated MFs in the corneal flap.which enhance corneal biomechanics and promote healing.However,most of the disadvantages caused by wound healing in SBK still remain compared to PRK.

Both pretreatment of lignocellulose and its saccharification process are treated with ultrasonic wave.The morphology,structure and crystal performance of the original and treated lignocellulose sample were characterized by SEM and FTIR.Moreover,the changes of raw materials caused by different pretreatment ways and the affect of saccharification rate brought about by ultrasonic wave were also studied.The result shows that the ultrasonic wave decreases the crystallinity of lignocellulose destroying the intermolecular hydrogen bonding effectively and improves the degradation rate of lignin and the saccharification rate of zymohydrolysis availably.The mechanism of activation of ultrasonic wave in zymohydrolysis process was discussed primarily.

Objective To investigate the antibacterial activity of the alkaloids extract from Oxytropis falcata Bunge against 9 common pathogens in vitro. Methods Alkaloids was extracted from Oxytropis falcata Bunge. The agar plate dilution method was adopted to evaluate the activity against bacteria of 4 Gram-negative test strains and 5 Gram-positive test strains, while the MIC and MBC were determined by tube double dilution method. Results The alkaloids extract from Oxytropis falcata Bunge had the antibacterial activity against 9 pathogens and there was a good dose-response relationship between sensitivity and concentration. Antibacterial activities against bacillus subtilis and stentrophmomas maltophilia showed stronger than other tested bacteria, the MIC and MBC were 0.95 mg/mL and 1.91 mg/mL, respectively. In other tested bacteria, MIC and MBC were ranged in 1.91-7.63 mg/mL. Conclusion The alkaloids extract showed a broad spectrum of a stronger antibacterial activity against all tested pathogens. Gram-positive strains were more sensitive than Gram-negative strains to the inhibitory effects of the alkaloids extract.

OBJECTIVE To study the clinical and radiological characteristics of jugular foramen tumors.METHODS The clinical data of 32 patients with tumors of jugular foramen region treated from May 2006 to December 2009 were retrospectively reviewed.All patients were referred to systematic imaging examination of the temporal bone,such as CT(X-ray computed tomography) and MRI(magnetic resonance).Twenty two patients were further examined by angiography and embo1ized 24 hours before operation.Thirty one patients underwent different operations via different approaches, while one patient with glomus jugular tumor didn't receive operation because of fever caused by sigmoid sinus thrombophlebitis.According to pathologic examination, 21 cases were glomus jugular tumors, 10 cranial nerve neurilemmomas.RESULTS In the 32 cases, the major initial clinical symptoms of jugular foramen tumors were tinnitus,hearing loss and facial palsy.Bone erosion and the "salt and pepper" sign were the characteristic appearance of glomus jugular tumor.Neurilemmoma showed compressive bone change, cystic area and moderate enhancement on CT.CONCLUSION The combination of CT and MRI examination is benefit for both diagnosis and the choice of surgical plan.

Objective The purpose of this study was to understand the pathogenic mechanisms of enterococcal hemolysin and establish the foundation to diagnose and control relevant diseases.Methods Take 30 clean grade ICR mice were randomly divided into ten groups,each 6,1 to 4 groups according to 10-fold gradient amount per 1 ml intraperitoneal injection of 5× 107 cfu/ml~5×1010 cfu/ml of EF A7,group 5 as a control group injected 0.5 ml saline,take another 30 clean grade ICR mice,intraperitoneal injection of 5×107 cfu/ml~5×1010 cfu/ml of EF A7 cyl mutant by the same measures,compared to the original strains of mice infected with mutant strain LD50,and a week after infection mortality was observed in mice daily. Another seven groups of mice with the same bacterial concentration (5×109 cfu/ml)were injected intraperitoneally EF A7 and EF A7 cyl mutant,after infection 6 h,12 h and 24 h comparing the number of leukocytes in peripheral blood of mice,re-spectively,the concentration of TNF-αin the acute phase of cytokines.Results In the mouse peritonitis models the 50% le-thal dose (LD50)of EF A7 cyl mutant was 100 times lower than enterococcus faecalis EF A7.The differences of the survival percentage of EF A7 cyl mutant groups and EF A7 groups have significance (P<0.05).As the changes in boold leukocytes numbers and the TNF-αlevel.Conclusion Cyl gene is probably a major virulence factor of Enterococcus and plays an impor-tant role in the mouse peritonitis model.

BACKGROUND: Taohong Siwu Tang is made up of Taoren, Honghua,Danggui, Chishao and Chuangxiong. Paeoniflorin is one of the major effective components in Radix Paeoniae Rubra Extracts and Taohong Siwu Tang, and it can promote blood circulation and remove blood stasis and has the effect of anti-acute myocardial ischemia.OBJECTIVE: To compare the serum concentration of paeoniflorin in mice after intragastric administration (i.g.) of Radix Paeoniae Rubra extracts and Taohong Siwu Tang.DESIGE: Rndomized controlled observation.SETTING: Department of Pharmacy and Department of Basic Medicine,Hebei North University.MATERIALS: The trial was performed in the first laboratory of Department of Pharmacy, Hebei North University during February to June 2005.Eighty involved Kunming mice of either gender and of clean grade, with body mass of 18 to 22 g, were purchased from Experimental Animal Center, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences. Taoren, Honghua, Danggui, Chishao, Shengdi and Chuanxiong 6 Chinese herbs were all purchased from Zhangjiakou Institute of Traditional Chinese Medicine.METHODS: ①Blank serum was isolated from eight mice which were fasted for 12 hours. Control sample solution of paeoniflorin was added into blank serum. Acetonitrile was used to deposit protein, the solution was centrifugated and isolated ,and 20μL supernatant was taken to obtain regression equation. ② Seventy-two Kunming mice were randomized into Radix Paeoniae Rubra extracts group and Taohong Siwu Tang group, with 36 mice in each. After being fasted for 12 hours, the mice in each group were intragastric administration of Radix Paeoniae Rubra extracts and Taohong Siwu Tang, respectively and the concentration of paeoniflorin was 300 mg/kg.1 mL blood was taken respectively at 15, 30, 60, 90, 120 and 180 minutes after intragastric administration and prepared into serum sample (6 mice at each time point in each group). The time to peak and difference in peak concentration of serum paeoniflorin were compared between intragastric administration of Radix Paeoniae Rubra extracts and Taohong Siwu Tang.The concentration of paeoniflorin was measured with high-performance liquid chromatography (HPLC). Chromatographic condition: chromatographic column YWG-C18 (250×4.6 mm,10 μm). The mobile phase was methanolKH2PO4 (0.05 mol/L) (38∶62) at a flow rate of 1.0 mL/min. The detective wavelength was set at 230 nm. The column temperature was 25 ℃.MAIN OUTCOME MEASURES: Serum concentration of paeoniflorin after administration of Radix Paeoniae Rubra extracts and Taohong Siwu Tang in mice.RESULTS: Seventy-two mice were used for Radix Paeoniae Rubra extr acts and Taohong Siwu Tang tests, and all of them entered the stage of result analysis without deletion. ① Chromatographic isolation results: Paeoniflorin could be well isolated from other components. The linear range for detection of paeoniflorin was 5.40-646.0 μg/mL. The mean recovery rate was 93.6% and the limit of detection was determined as 1.08 mg/L. ②Comparison of concentration of serum paeoniflorin of mice between two groups: The concentration of serum paeoniflorin in the Radix Paeoniae Rubra extracts group and Taohong Siwu Tang group reached the peak at 30 and 60 minutes after intragastric administration, respectively. The peak concentration of paeoniflorin of Taohong Siwu Tang group was lower than that of Radix Paeoniae Rubraextracts group [(36.27±5.72) mg/L vs.(46.82±5.29) mg/L, P ＜ 0.01 )].CONCLUSION: The concentration of serum paeoniflorin is significantly decreased after intragastric administration. It was further confirmed the decreased concentration of the crude paeonifiorin in the mice sera might result from promotion of its metabolic conversion by other chemical components in the complex prescription. This result needs further investigation.

AIM: To study the effect of acute renal failure (ARF) on the differentiated frequency of Sca-1+ cells from murine fetal liver in irradiated mice. METHODS: The Sca-1+ cells from murine fetal liver were isolated with magnetic cell sorting (MACS) technique, the sex of which was identified by PCR. The 2?104 Sca-1+ cells were transplanted into a lethally irradiated ([ 60Co], 8 Gy) inbred female mouse. After 8 weeks, these recipient mice were divided to A, B, and C groups at random (A group: irradiated; B group: ARF; C group: ARF and Sca-1+). The mice in B and C groups were induced to ARF with 50% (V/V) glycerin (11.6 mL/kg). 72 hours later, the mice in C group were injected with the fresh prepared Sca-1+ cells again. 8 weeks later, mice were sacrificed, and their kidneys were taken out, fixed and slices were prepared. Fluorescence in situ hybridization (FISH) of renal slices was performed and the pictures of them were taken and analyzed. RESULTS: The cells containing Y chromosome were found in renal slices from the mice in A, B and C groups, which located in epithelial cells of renal tubules, interstitium, glomeruli, and glomerular margin and increased gradually. The double and encircle zone of Y chromosome cells were found in the slices from the mice in B and C groups separately, which was consist of new renal tubules. The differentiation frequency of Sca-1+ cells in kidney in A, B and C groups were (1.65?0.18)%, (8.58?1.34)% and (18.13?1.91)%, respectively, which showed significant difference between former group and later group (P

Objective To investigate the changes of plasma leve of brain natriuretic peptide(BNP) in patients with various heart diseases.Methods Plasma BNP levels in 106 patients with heart disease and 65 controls were determined with ELISA.Results Plasma BNP levels in the heart disease patients were significantly higher than those in the controls.Conclusion The dynamic changes of plasma BNP levels may participate in the course of development of heart disease.The plasma BNP detection has broad practical value in clinic.