objective To observe the effects of co-culture of hTNFα-sercreting and human colon cancer cells LOVO on the proliferation of cancer cells. Methods The stable transfected hTNF-α/293 , mRNA of Hek-293 cell and protein expression were detected by RT-PCR and ELISA. The positive group was added hTNF-αfactor,and MTT assay was applied under the optical density 490 nm. Through human tumor cell proliferation inhibition experiment,the inhibitory effects on colon cancer cells ( LOVO) proliferation were observed. Results hTNF-α/293 cells and hTNF-α-positive group showed a significant lower A,which suggested that hTNF-α/293 cells and hTNF-α-positive group had significant inhibition on the proliferation of colon cancer cells. Conclusion The inhibition of hTNF-αsecreted by hTNF-α/293 cells on co-lon cancer cell proliferation shows significant dose-effect dependency,and hTNF-αexpresses a considerable inhibition on the colon cancer cell proliferation as positive drug.

Objective To establish a stable method for acute isolation of atrial myocytes in diabetic rats,so as to provide materials for electrophysio?logical study of diabetic rats. Methods Streptozotocin(STZ)was used to establish type I diabetic model. Atrial myocytes were isolated with modi?fied perfusion buffer by Langendorff perfusion. The atrial myocytes were morphologically observed with optical microscope and identified by morphol?ogy and immunofluorescence staining. The action potential was recorded by patch clamp technique. Results STZ can establish a stable type I dia?betic model. The modified perfusion method can yield calcium tolerant and spindle shaped atrial myocytes. Immunofluorescence indicated that atrial myocytes were positive for Kv1.5 which was expressed in atrial myocytes. The atrial myocytes obtained by this method were able to generate action po?tentials. Conclusion The modified perfusion method is suitable for acute isolation of atrial myocytes in rats with diabetes mellitus,which may help to study the electrophysiology of diabetic heart.

Objective To construct the genetic engineered cell line which can continuously secrete human tumor necrosis factor ( hTNFα) in Chinese Hamster Ovary cells( CHO cells) ,and observe the change of its protein secretion function.Methods Constructed plas-mid which carries hTNFαgene expression through vector GV141.Selected stable transfection cell lines by G418 and transfection with lipo-fectamine.Identified its gene expression with Real-Time PCR,and identified its protein secretion by ELISA.Results GV141-hTNFαexpres-sion vectors were constructed successfully which were proved by sequence alignment.Real-Time PCR proved that it contained hTNFαgene in hTNFα/CHO cell line.ELIAS identification results showed that the cell lines can continuously secrete hTNFαwithin a certain cell propaga-tion.Conclusion The hTNFα/CHO cell line can continuously secrete human tumor necrosis factor within a certain cell propagation.

Objective To establish the model of glioma by hypodermic of C6 cells line into the nude mice and observe the growth characteristics. Methods The C6 gliocyte suspension was injected into the left subaxillary hypoderma of nude mice. The diameter and the volume of the tumor were measured and calculated, and the volume-time growth curve was plotted. The cells of tumor were observed under the HE and glial fibrillary acidic protein (GFAP) immono-histochemistry staining. Results The tumor appeared in inoculation area 7 d after injection, and presented nearly exponential development after about 20 d. The survival time of the nude mice is 22～48 d. The tumors were with sharp border, affluent blood vessel, and a great number of GFAP-positive cells. Conclusion The model of glioma can be well induced by hypodermic of the cultured C6 gliocyte into nude mouse.

Objective To construct a cell line with long time secreting endostatin. Methods Human endostatin cDNA containing interleukin-2 (IL-2) secreting peptide was cloned into eukaryotic expression plasmid pSNA2.0 to construct recombinant plasmid pSNA2.0/Endostatin. The plasmid pSNA2.0/Endostatin was transfected into HEK293 cells by cationic liposome. The positive cell clones were selected by G418 and named hED/293. The expression of endostatin protein was analyzed by Western-blot. Results Endostatin could be determined in the supernatant of hED/293 cells. Conclusion The recombinant eukaryotic expression vector is correctly constructed. The human endostatin protein can be expressed and secreted.

Objective To evaluate the association between hemoglobin concentration and stroke severity on admission in ischemic stroke without diabetes. Methods Based on the China National Stroke Registry,the information of acute stroke patients were collected by trained research coordinators and investigators with the methods of review clinical records or interview. Demography, disease history, behavior and habits, hemoglobin concentration,and NIHSS score on admission were collected in this study. The iIncluded patients with the integri?ty of the information of non diabetes,3 h to the hospital,no gastrointestinal bleeding and Hb concentration and NIHSS score at admission. Hemoglobin concentration was classed according to quintiles and the outcome was grouped into ≤3 and >3 groups. The method of logistic regression was used to explore the association between hemoglobin and NIHSS. Results A total of 1 419 individuals was included in this study,including 883 males and 536 females. The mean age was 67. 24±12. 46 years old and the proportion of NIHSS>3 was 67. 51% (958/1419). With respect to non?minor stroke (NIHSS>3),the odds rations and 95% confident intervals of patients with hemoglobin ≤121. 0 g/L(Q1),>122. 1-≤132. 0 g/L(Q2),>141. 0-≤152. 0 g/L(Q4),≥152. 1 g/L (Q5) were 1. 84(95%CI 1. 21-2. 79,P=0. 004),1. 24(95%CI 0. 83-1. 86,P=0. 294),1. 32(95%CI 0. 88-1. 96,P=0. 178) ,1. 52( 95%CI 1. 01-2. 28,P=0. 044) respectively,compared with hemoglobin between 132. 0 and 141. 0 g/L( Q3) . Conclusion Stroke severity is associated with lower and higher hemoglobin concentration in acute ischemic stroke without diabetes.

OBJECTIVE:To establish a method for the simultaneous determination of chlorogenic acid,vitexin glucoside,vi-texin rhamnoside,vitexin,rutin and hyperoside in Crataegus pinnatifida. METHODS:With reference peak of vitexin glucoside, HPLC was conducted to calculate the relative correction factor(RCF)of chlorogenic acid,vitexin glucoside,vitexin rhamnoside, vitexin,rutin and hyperoside,then the contents of above-mentioned 5 components in C. pinnatifida were calculated. The column was Agilent ZORBAX SB C18 with mobile phase of 0.1% formic acid-acetonitrile-tetrahydrofuran (gradient elution) at a flow rate of 1.0 ml/min,the detection wavelength was 350 nm,column temperature was 30 ℃,and the injection volume was 10 μl. RE-SULTS:The linear range was 12.50-400.0 μg for chlorogenic acid(r=0.999 8),25.00-800.0 μg for vitexin glucoside(r=0.999 9), 31.25-1 000.0 μg for vitexin rhamnoside(r=0.999 9),6.470-260.0 μg for vitexin(r=0.999 9),2.50-80.0 μg for rutin(r=0.999 8) and 9.375-300.0 μg for hyperoside(r=0.999 9);RSDs of precision,stability and reproducibility tests were lower than 2.0%;re-coveries were 99.2%-103.9%(RSD=1.6%,n=6),97.9%-100.8%(RSD=1.2%,n=6),99.2%-100.8%(RSD=0.5%,n=6), 97.3%-101.3%(RSD=1.5%,n=6),98.0%-103.0%(RSD=1.9%,n=6)and 95.5%-101.5%(RSD=2.2%,n=6). RCFs of vitex-in glucoside with chlorogenic acid,vitexin rhamnoside,vitexin,rutin and hyperoside were 1.119,1.009,0.706,1.063 and 0.830, respectively. CONCLUSIONS:The method is simple with good precision,stability and reproducibility,and it can be sued for the simultaneous determination of 6 components in C. pinnatifida.

ObjectiveTo explore the methods of low temperature preservation for alginate-polylysine-alginate (APA) microcapsules.MethodsAPA microcapsules were prepared with static electricity, and underwent hypothermal treatment respectively through methods of program control, gradient by icebox and put in liquid nitrogen directly, finally preserved in liquid nitrogen. The form and permeability of APA microcapsules were checked after rewarming.ResultsThe rates of integrity, crenation and damage were (91.2±1.57)%, (3.1±0.81)% and (5.7± 2.62 )% in the program control group; (85.3±1.42)%, (5.2±0.74)% and (9.5± 3.81 )% in the gradient by icebox group; (14.5±1.57)%, (84.1±3.47)% and (1.4±2.62)% in the directly put in liquid nitrogen group. The membrane permeability of full APA microcapsules after frozen and reworming was not changed obviously.ConclusionThe program control method can preferably preserve APA microcapsules at low temperature and keep them having normal form and permeability.

Objective To observe the effect of APA-BCC(alginate-polylysine-alginate microencapsulated bovine adrenal medullary chromaffin cells)microcapsules transplantation into the subarachnoid space of cancer pain patients on endogenous opioid peptides and catecholamine concentration in cerebrospinal fluid(CSF).Methods The different doses of APA-BCC microcapsules were transplanted into the spinal subarachnoid space of cancer patients with moderate or serious pain.The concentrations of Leu-enkephalin(L-EK),β-endorphin(β-EP),dynorphin A(DynA),noradrenaline(NA)and adrenaline(AD)in CSF were tested.Results L-EK concentration in CSF increased remarkably after transplantation,and the increase was most remarkable when transplantation doses were 1.0×107and 1.25×107;there were no remarkable changes of β-EP,DynA,NA and AD after transplantation.Conclusion The analgetic effects of APA-BCC microcapsules tranplantation may correlate with the increase of L-EK in CSF of cancer pain patients;the dose of 1.0×107 and 1.25×107cells may be the most effective dose.

Prolonged P-wave duration has been observed in diabetes. However, the underlying mechanisms remain unclear. The aim of this study was to elucidate the possible mechanisms. A rat model of type 2 diabetes mellitus (T2DM) was used. P-wave durations were obtained using surface electrocardiography and sizes of the left atrium were determined using echocardiography. Cardiac inward rectifier K+ currents (I(k1)), Na+ currents (I(Na)), and action potentials were recorded from isolated left atrial myocytes using patch clamp techniques. Left atrial tissue specimens were analyzed for total connexin-40 (Cx40) and connexin-43 (Cx43) expression levels on western-blots. Specimens were also analyzed for Cx40 and Cx43 distribution and interstitial fibrosis by immunofluorescent and Masson trichrome staining, respectively. The mean P-wave duration was longer in T2DM rats than in controls; however, the mean left atrial sizes of each group of rats were similar. The densities of I(k1) and I(Na) were unchanged in T2DM rats compared to controls. The action potential duration was longer in T2DM rats, but there was no significant difference in resting membrane potential or action potential amplitude compared to controls. The expression level of Cx40 protein was significantly lower, but Cx43 was unaltered in T2DM rats. However, immunofluorescent labeling of Cx43 showed a significantly enhanced lateralization. Staining showed interstitial fibrosis was greater in T2DM atrial tissue. Prolonged P-wave duration is not dependent on the left atrial size in rats with T2DM. Dysregulation of Cx40 and Cx43 protein expression, as well as fibrosis, might partly account for the prolongation of P-wave duration in T2DM.
Action Potentials ; Animals ; Blotting, Western ; Connexin 43/metabolism ; Connexins/metabolism ; Diabetes Mellitus, Type 2/*physiopathology ; Disease Models, Animal ; Echocardiography ; Electrocardiography ; Fibrosis/pathology ; Heart Atria/*diagnostic imaging/physiopathology ; In Vitro Techniques ; Male ; Membrane Potentials ; Microscopy, Fluorescence ; Patch-Clamp Techniques ; Potassium Channels/metabolism ; Rats ; Rats, Wistar