Objective To study the feasibility of TNF-α promoting migration of rat mesenchymal stem cells (MSCs) to local damaged tissues. Methods The MSCs was exposed to TNF-α at different concentrations and the expression rate of surface adheslon molecules and specific markers as well as their adhesion to endothelial cells were detected.Based on the above steps,the MSCs stimulated with the optimal concentration of TNF-α were obtained and were injected intravenously to the rats whose hindlimbs experienced ischemia damage.The rats were executed for achieving the muscle samples in the ischemic area,which were made into frozen section to count the number of MSCs. Results ( 1 ) Twenty-four hours after the TNF-o stimulation,the expression of adhesion molecule (VCAM-1) of MSCs increased in a concentration-dependent manner,while the expression of adhesion molecules (ICAM-1,L-Selectin and VLA4) of MSCs showed no significant changes.Besides,the expression rate of specific markers of MSCs was also obscure.(2) Exposed to 10 ng/ml TNF-o,MSCs presented an obviously increased ability in adhesion to the endothelial cells.(3) MSCs stimulated with 10 ng/ml TNF-α showed a larger number in the ischemia-damaged tissue of rat hindlimbs than that in the control group. Conclusion TNF-α at concentration of 10 ng/ml is effective within a short term in increasing VCAM-1 expression in rat MSCs and promoting the adhesion of MSCs to endothelial cells without affecting their character.

AIMTo study the protective role of endogenous carbon monoxide to lung and kidney tissues during septic shock and its mechanism.

METHODSA rat model of CLP was built by using the method of CLP. The malondialdehyde (MDA) content and the activity of superoxide dematase (SOD) in blood, lung and kidney were detected by immunohistochemical technique and light microscope.

RESULTSPathological changes of lung and kidney in CLP + Hemin group were lighter than CLP group, inflammatory reaction and lipid peroxidation were also lighter.

CONCLUSIONEndogenous CO can protect lung and kidney from the oxidative injury. It can suppress in flammation and the oxidative injury caused by activated inflammatory cells, it is probably an important mechanism of its protective effects.

Animals ; Carbon Monoxide ; physiology ; Hemin ; pharmacology ; Kidney ; metabolism ; pathology ; Lipid Peroxidation ; Lung ; metabolism ; pathology ; Male ; Malondialdehyde ; analysis ; Rats ; Rats, Sprague-Dawley ; Shock, Septic ; metabolism ; pathology ; Superoxide Dismutase ; metabolism

AIMTo investigate the protective effect of melatonin (MT) on lung tissues during acute lung injury (ALI) in rats and its possible mechanism.

METHODSAll rats were randomly divided into four groups: control group, lipopolysaccharide (LPS) group, dexamethasone (DEX) and MT treatment group. Myeloperoxidase (MPO) activity, superoxide dismutase (SOD) activity and malonaldehyde (MDA) content of lung tissues were detected at 3, 6 and 12 h after intratracheal instillation in each group. In addition, the expression of intercellular adhesion molecule-1 (ICAM-1) were observed through immunohistochemistry staining in lung tissues.

RESULTSCompared with control group, SOD activity decreased significantly in LPS group (P < 0.01), but MPO activity,MDA content and the expression of ICAM-1 increased obviously (P < 0.01). The administration of MT and DEX mitigated above changes significantly (P < 0.05 or P < 0.01).

CONCLUSIONMT possessed protective effect on lung tissues during ALI through scavenging free radicals and inhibiting the expression of ICAM-1 probably.

Acute Lung Injury ; chemically induced ; metabolism ; physiopathology ; Animals ; Antioxidants ; pharmacology ; Intercellular Adhesion Molecule-1 ; genetics ; metabolism ; Lipopolysaccharides ; Male ; Melatonin ; pharmacology ; Peroxidase ; metabolism ; Protective Agents ; pharmacology ; Random Allocation ; Rats ; Rats, Sprague-Dawley ; Superoxide Dismutase ; metabolism

It is necessary to control the mechanical stimuli precisely in the studies of cardiac mechano-electrical feedback (MEF). In the present study a ventricular pressure-clamping system has been developed, which can be applied to isolated-perfused rabbit hearts. Controlled by a computer, this system not only can make the left ventricle follow a command defining the same pressure wave as that during a beating cycle under physiological condition, but also deliver mechanical stimuli with a proper waveform to the ventricle at a particular time phase. This system integrates multiple functions, including perfusing, pacing, recording of electrocardiogram and monophasic action potentials, and clamping and measuring of ventricular pressures in isolated-perfused hearts. Thus, it is a distinct system for investigating the phenomena and mechanisms of cardiac MEF at organ level.
Action Potentials ; Animals ; Constriction ; Electrocardiography ; Feedback ; Heart ; physiology ; In Vitro Techniques ; Rabbits ; Ventricular Pressure

In order to discover light quality's effects on growth, photosynthesis and effective components content of Panax notoginseng, a pot experiment using 7 light qualities (red, orange, yellow, green, cyan, violet, and blue) was conducted. The growth, photosynthesis and content change of effective components were measured during plant growth. The results showed that light qualities had significant effect on plant growth, red light increased the plant height, while cyan, yellow, violet, and blue lights promoted accumulation of biomass underground, blue and yellow lights increased the photosynthesis, cyan light increased accumulation of ginsenoside Rd, yellow and cyan lights increased total effective components of individual plant.
Light ; Panax notoginseng ; growth & development ; metabolism ; radiation effects ; Photosynthesis ; radiation effects ; Plant Extracts ; analysis ; metabolism

OBJECTIVETo develop a system for automatically controlling carotid sinus pressure in the study on baroreceptors.

METHODSThe preparation containing carotid sinus with parts of the connected vessels and carotid sinus nerve (CS-CSN) were isolated and perfused. A critical pressure controlling component (PRE-U, Hoerbiger, Deutschland) dictated by a computer was integrated into the system to clamp the intrasinus pressure. The pressure command and the relevant intrasinus pressure were compared to evaluate the validity of the pressure controlling system.

RESULTSA variety of sinus pressure-controlling patterns, including pulsation, ramp and step pressures, could be achieved accurately by using the system, and the pressure-dependent discharge activities of sinus nerve were confirmed.

CONCLUSIONThis system for clamping carotid sinus pressure could realize multiple pressure-controlling patterns and is a useful and flexible pressure controlling method that could applied in the study on mechano-electric transduction of baroreceptors.

Animals ; Blood Pressure ; Carotid Sinus ; innervation ; physiology ; Nerve Fibers ; physiology ; Pressoreceptors ; physiology ; Rabbits

Objective To construct the adeno-associated virus (AAV)vector of mouse carrying T-bet gene,which was applied to mouse model of asthma by nose,and to investigate the immunomodulatory effects of T-bet delivery on asthma.Methods Forty healthy Balb/c mice (aged 6-8 weeks) were randomly divided into 4 groups:control group (group A),asthma model group(group B),model/control recombinant adeno-associated virus carrying enhanced green fluorescent protein(rAAV-eGFP) intervention group (group C) and model/rAAV-T-bet virus intervention group(group D),with 10 mice in each group.In group B,group C,and group D,Balb/c mice were sensitized by intraperitoneal injection with OVA and challenged by nebulized OVA.In group C and group D,Balb/c mice were intervened with the isodose rAAV-eGFP and rAAV-T-bet,while in group B,the mice were intervened with the same amount of saline,both of them were dropped into the nasal cavity.Twenty-four hours after the last injection,the mice were sacrificed and the samples were obtained.The total cells in bronchoalveolar lavage fluid (BALF) were counted,and the types of cells were analyzed by Wright-Giemsa staining.The levels of interferon-γ (IFN-γ),IL-4 and IL-5 in BALF were determined by enzyme-linked immunosorbent assay.The expressions of T-bet,GATA-3 and Foxp3 protein in the lungs of asthmatic mice were detected with immunohistochemical technique.Results 1.The level of specific transcription factor T-bet in group B and group C were distinctly lower than that of group A (all P ＜ 0.05),while the level of GATA-3 was significantly higher than that of group A(all P ＜ 0.05).In group D,the expression of T-bet protein was stronger than that in group B and group C,however,the expression of GATA-3 decreased obviously (all P ＜ 0.05).The results of Foxp3 were similar to T-bet.2.In group D,the mice had suppressed levels of IL-4 [(158 ± 55) ng/L] and IL-5 [(68-± 22) ng/L] compared with those in group B and group C(all P ＜0.05).The level of IFN-γ[(113-±35) ng/L] increased compared with those in group B and group C (all P ＜ 0.05).At the same time,the number of total cells and eosinophil in BALF were both obviously lower than those of group B and group C (all P ＜ 0.05).Conclusions On the basis of building mouse model of asthma,intranasal administration of rAAV-T-bet can deliver T-bet gene to airway successfully and efficiently,and plays an immunomodulatory role in immune confusion of asthma.

OBJECTIVETo analyse the heritabilities of physical growth items of body and its related factors.

METHODSAn 116 twin pairs of Han nationality, 67 monozygotic (MZ) and 49 like-sex dizygotic (DZ) aged 6 to 12 years, were investigated from June to October in 2004. The measurements included height, weight, sitting height, chest circumference, biacromial breadth and biiliac breadth, and BMI index calculated by the former two measurements. The heritabilities were estimated by using intraclass correlation coefficient method from the adjusted data for age.

RESULTSThe intraclass correlation coefficient was greater in the MZ twins than in the DZ twins. The estimated heritabilities of height, weight, BMI, sitting height, chest circumference, biacromial breadth and biiliac breadth were 0.89, 0.88, 0.73, 0.87, 0.78, 0.78, 0.73 in boys and 0.87, 0.74, 0.72, 0.86, 0.62, 0.56, 0.59 in girls adjusted for age. Therefore, there were no sex difference for the heritabilities of height, sitting height and BMI, but the male heritabilities of weight, chest circumference, biacromial breadth and biiliac breadth were higher than the female's respectively.

CONCLUSIONPhysical growth items should be mainly determined by the genetic factors. There are sex differences for the heritabilities of weight, chest circumference, biacromial breadth and biiliac breadth, i.e., the girls might be affected more easily by environmental factors than the boys in these items.

Asian Continental Ancestry Group ; genetics ; Body Height ; genetics ; Body Mass Index ; Body Weight ; genetics ; Child ; China ; Female ; Humans ; Male ; Twin Studies as Topic ; Twins, Dizygotic ; ethnology ; genetics ; Twins, Monozygotic ; ethnology ; genetics

Objective·To evaluate the value of texture analysis in the discrimination of colorectal cancer (CRC) and ulcerative colitis (UC). Methods?·?The CT images of 61 CRC patients, 62 UC patients and 42 control objects were retrospectively analyzed. All the patients were pathologically proved and performed triphasic contrast-enhanced CT scan: non-enhanced phase (NP), the arterial phase (AP) and the enteric phase (EP). The region of interest was drawn along the abnormal bowel wall’s edge in each scan phase and texture features were generated by MaZda software. Based on 3 texture feature selection methods, the optimal subsets were generated and analyzed by 6 texture feature classification methods. The results were shown by misclassification rate (MCR). To compare the performance of texture-based classification and human visual classification, two radiologists with more than 10 years of gastrointestinal disease diagnostic experience analyzed the data. Results?·?The texture analysis based average MCR of differentiation between CRC and UC was (28.42±6.89)%, (28.19±4.07)%, (19.10±3.58)% in NP, AP, EP respectively. Compared with other texture feature classification methods, nonlinear discriminant analysis (NDA) was more accurate. In EP, NDA achieved an excellent classification result (MCR=12.61%). The average MCR between CRC and normally dilated bowel wall (NOR) was (13.33±7.21)%, (15.49±5.47)%, (6.74±3.02)%, while the average MCR between UC and NOR was (19.26±4.68)%, (20.04±6.63)%, (16.74±6.36)% in NP, AP and EP respectively. For visual classification between CRC and UC, the average MCR was (40.48±3.21)%, (35.71±1.60)%, (26.43±1.15)% in NP, AP, EP respectively. But the MCR of texture classification was lower than that of human vision classification, and computer texture classification had higher differential diagnosis rate. Conclusion?·?The CT-based texture analysis could be a feasible supplementary method to differentiate CRC from UC. NDA is more accurate than other classification methods, especially in EP.

Adult ; China ; epidemiology ; Circoviridae Infections ; epidemiology ; virology ; DNA, Viral ; analysis ; Female ; Genotype ; Hepatitis, Viral, Human ; virology ; Humans ; Male ; Substance Abuse, Intravenous ; virology ; Torque teno virus ; genetics ; isolation & purification