Objective To evaluate the regulatory role of mTOR signaling in activation of renal interstitial fibroblasts and the potential effect on interstitial fibrosis. Methods 8-week old female C57BL/6 mice (n=30) underwent unilateral ureteral obstruction (UUO) to induce renal interstitial fibrosis. Animals were randomly divided into rapamycin (2 mg·kg-1· d-1) group and UUO group (vehicle-treated) (n=15 each group). Daily intraperitoneal injection of rapamycin or saline was applied to animals from day 1 before operation to the end of experiment.Three mice were sacrificed at day 1,3,7,14 respectively and kidneys were harvested for further analysis.NIH3T3 cells were stimulated by TGF-β for 12 hours with the presence or bsence of rapamycin (100 nmol/L). Results Immunofluorescent co-staining revealed that active fibroblasts highly expressed pS6K and α-SMA in kidney interstitium.Administation of rapamycin significantly inhibited activation of mTOR signaling in fibroblasts and ameliorated interstitial fibrosis of obstructed kidneys.Real-time PCR confirmed that rapamycin decreased the mRNA expression of FSP1,TGF-β,CTGF and Col4A1 in fibrotic kidneys. In vitro experiment revealed that TGF-β induced highly expression of pS6K and αSMA in cultured NIH3T3 cells,which could be markedly inhibited by rapamycin. Conclusions mTOR signaling highly activates in interstitial fibroblasts during kidney fibrosis.Inhibition of mTOR signaling by rapamycin decreases the activation of fibroblasts and ameliorates interstitial fibrosis.

Apoproteins ; analysis ; Epithelium ; chemistry ; ultrastructure ; Humans ; Lung ; chemistry ; pathology ; Nuclear Proteins ; analysis ; Pulmonary Sclerosing Hemangioma ; chemistry ; pathology ; Pulmonary Surfactant-Associated Proteins ; analysis ; Secretory Component ; analysis ; Thyroid Nuclear Factor 1 ; Transcription Factors ; analysis

0.05).Amplitudes of OPs and b wave were significantly decreased after experiment in STZinduced diabetic group(P

Objective To evaluate the effect of prefilling blood reservoir with mannitol-adeninephosphate MAP) solution on the damage to erythrocytes in intraoperative salvaged blood in patients.Methods One hundred and fifty blood samples were collected from 150 patients who were scheduled for elective spinal surgery requiring blood salvage,and were equally and randomly divided into 5 groups (n =30 each) using a random number table:group N,group N1,group N2,group M1 and group M2.The blood reservoir was not prefilled before surgery in group N,while the blood reservoirs in N1,N2,M1 and M2 groups were prefilled with normal saline (NS) 100 ml,NS 200 ml,MAP solution 100 ml and MAP solution 200 ml,respectively.Blood sauples were obtained for erythrocyte osmotic fragility test after the salvaged blood was washed,and hemolysis rates in different concentrations of hypotonic NaCl solution were calculated.The concentration of free hemoglobin in the clear supernatant liquid (FHb) of washed blood placed for 0 h (T0),1 h (T1) and 2 h (T2) were detected.Results Compared with N and N1 groups,the hemolysis rate of washed erythrocytes under 0.48％ 0.68％ NaCl solutions was significantly decreased,the concentration of FHb at T1 was decreased,and no significant change was found in FHb at T2 in group M1.Compared with N and N2 groups,the haemolysis rates of washed erythrocytes under 0.48％-0.68％ NaCl solutions were significantly decreased,and the concentrations of FHb at T1,2 were decreased in group M2.The concentration of FHb was significantly lower at T2 in group M2 than in group M1.Conclusion Prefilling blood reservoir with MAP solution can mitigate the damage to erythrocytes in the intraoperative salvaged blood in patients,and the efficacy of prefilling of 200 ml is superior to that of prefilling of 100 ml.

Objective To define the effect and mechanism of hyperkalemic solution on atrial natriuretic peptide (ANP) secretion in rabbits. Methods Eighteen rabbits were selected and the chest was opened under anes-thetization to remove the heart. The left atrium was isolated and fixed in the atrial perfusion system with proper electric stimulation for beating. The following experiments were carried out on beating rabbit atria: ①The atrium was perfused for 60 min to stabilize parameters of ANP secretion and atrial dynamics. The control period (12 min as an experimental cycle) was followed by an infusion of hyperkalemic solution (K+ concentration of hyperkalemic solution was 5.64 mmol/L and the osmolarity of hyperkalemic solution was unchanged) for three cycles, then normal K+ cancentration was recovered for two cycles;②The control period was followed by an infusion of L type Ca2+ channel blocker nifedipine (1.0 μmol/L) for three cycles;③L type Ca2+ channel inhibitor nifedipine (1.0 μmol/L) was infused for 36 rain prior (three cycles) to infusion of hyperkalemic solution. Atrial stroke volume was determined and the ANP secretion was measured by radioimmtmoaasay. Results (1)Hyperkalemic solution increased atrial ANP secretion (P<0.01) and reduced the atrial stroke volume,hut the difference was not statistically significant as compared with that of the control cycle(P>0.05). The recovery trend was to the normal level of ANP secretion and atrial stroke volume was to become normal gradually when solution level recovered to normal ,which was not significantly different from that of the control cycle (P>0.05) ;②Nifedipine (1.0 μmol/L) also increased the atrial ANP secretion (P<0.01 or P <0.05) while decreasing atrial stroke volume (P<0.01 or P < 0.05 ) ; ③Nifodipine (1.0μmol/L) completely blocked the effect of hyperkalemic solution so to increase the ANP secretion (P <0.01 ). Conclusion Hyperkalemic solution significantly increases atrial ANP secretion via extracellular high K+ competitive inhibition of extracellular Ca2+ inflow in beating rabbit atria.

Objective To study the changes and management of systemic and pulmonary hemodynamics during anhepatic period in patients undergoing orthotopic liver transplantation without veno-venous bypass.Methods Sixty-eight patients with end-stage liver disease undergoing orthotopic liver transplantation were enrolled in this research. Monitoring and recoding CVP, MAP, CI, HR, MPAP, PAWP PVR, SVR at different time points: preincision, before anhepatic, 5, 30 min of anhepatic, 5, 30, 60 min of neohepatic,ending of operation, 12 h and 24 h after operation. All the patients were divided into three groups according CVP during anhepatic period: group A(CVP <4 mmHg) ,group B(4 mm Hg≤CVP≤6 mmHg) ,group C (CVP>6 mmHg). Besides, calculating the concentration of dopamine, norepinephrine ,epinephrine and the volume of urine during of operation. Results There were different changes during different operation periods. During anhepatic period, HR, PVR and SVR increased, while CVP, CI, MAP, PAP, PAWP decreased(P<0.05). At early neohepatic period, HR decreased and CVP,PAWP, MPAP,CI,PVR SVR increased ,At the beginning of neohepatic period, MAP dacreased or increased quickly, and became steadily after 5 min. Among the three groups, the changes of hemodynamics in group B was slightest,and the concentration of dopamine, norepinephrine and epinephrine was smallest (P< 0.05 ). Conclusions The systemic and pulmonary emodynamics fluctuated sharply during anhepatic and early neohepatic period. It is important and useful to manage CVP 4 -6 mmHg, MABP ≥ 60 mmHg by infusing liquid and vasoconstrictors,such as dopamine, norepinephrine or epinephrine during anhepatic period.

Unicellular green alga,Dunaliella salina(D.salina),is a biflagellar alga without cell wall,which is a kind of very important eukaryotic microalga.In the previous study,the research of D.salina focus on the morphology,the mechanism of salt tolerance and ?-carotene,however,with the rapid development of microalgal biotechnology,a lot of work about D.salina was reported in recent years.In the area of molecular biology,the studies of D.salina mainly place emphasis on the cloning and analysis of important functional genes,regulatory sequences,and the expression of foreign genes using D.salina as host.The research advance in these aspects were reviewed.

The human canstatin cDNA was amplified by RT-PCR and then directionally cloned into pU? expression vector. The recombinant pU?-Can vector was connected with the screening marker (bar box), to construct a eukaryotic expression vector called pU?-Can-Bar. This expression vector was introduced into the D.salina by glass beads method. The screening culture of transformants of D.salina was performed in solid media containing 5 ?g/ml PPT, and the analyses of transformants were carried out through PCR and Southern blot. PCR results revealed that specific 700 bp products were detected in the different transformants of D.salina but not in negative control. Southern blot analysis further demonstrated that human canstatin gene was integrated into the D.salina genome. Moreover, the results of genetic stability analyses of transformants demonstrated that canstatin gene was stably inherited in the D.salina transformants. The successful preparation of the D.salina transformants will provide the experimentation evidence for producing canstatin protein cosmically by using the D.salina bioreactor and give a better prophase work basis for clinic application of canstatin protein early.

Nutrition investigations on the workers of drilling rig “Bohai 7” belong ing to Bohai Oil Company were conducted in November (winter) 1990 and June (summer) 1991, Energy consumptions of seven major and nine special actions of the offshore personnels were studied. Based on this, recommended amount of food to be taken and that of nutrients to be supplied in the daily dietary intake have been proposed for the workers on offshore drilling platforms, to improve the present improper food pattern which was characterized by high fat and low vitamin to ensure the workers health and to increase their potential adaptability to the special environment.

A HPLC method was established to determine the contents of the five anthraquinones and rhaponticin in the different varieties of Rhei Radix et Rhizoma. The difference existed in different varieties. The results showed that rhein and rhaponticin were marker substances which could be used to distinguish palm leaf groups rhubarb and wave leaf groups rhubarb. Authentic rhubarb didn't contain rhaponticin. Falsify rhubarb contains trace amounts of rhein. Rheum tanguticum contains abundant rhein. The ratio value of the content of rhein to chrysophanol could be used to distinguish R. tanguticum from the other two authentic varieties (R. palmatum and R. officinale). The content of rhaponticin varied largely in different varieties of wave leaf groups rhubarb.
Chromatography, High Pressure Liquid ; methods ; Drugs, Chinese Herbal ; analysis ; Quality Control ; Rheum ; chemistry ; classification ; Rhizome ; chemistry ; classification