Objective　To observe some biological features of bone marrow mesenchymal stem cells and explore the best conditions for isolatin g and culturing in vitro. Methods　Common cell culture techn ique, light and electron microscopy were used to study the effects of the growth , proliferation, morphology of the bone marrow mesenchymal stem cells in differe nt adherent time, concentration of serum and cell density. Results　The best culture condition in vitro for growth was 4-24 hours adherent time, 5%-10% fetal bovine serum, (4-8)×104/ml cell density. The cells were sp indle in shape and had a strong ability of proliferation. The time for cell duplication was 3 to 4 days. The cells showed the characteristics of stem cell s in electron microscope. Conclusion　The best condition for iso lation and culture of bone marrow mesemchymal stem cells was successfully establ ished and some biological features were obserred. It found a base for further in vestigation and using of mesenchymal stem cells.

Objective　To compare the irradiation-protective and inter-synergestic effects of E838,WR-2721, Rubia cordifolia, cystamin e hydrochloride and ethinyl estradiol on radiation and combined radiation-burn injury. Methods　Above-mentioned drugs were given to the mice i ntraperitoneally, or intragastrcally, then, the mortality and the average surviv al d for 30 d were observed before and after the administration of the drug s. Results　①When drugs were before injury , the survival rate and the average survival d of the radiation and combined radiation-burn injured mice were increased obviously with the best effect in E838 and WR-2721. ②When drugs were given after injury, E838 and R. cordifolia also kept the effect. ③Combined appling WR-2721（pre) and E838（post）displayed a significant syner gistic reaction. Conclusion　E838 and WR-2721 are more e ffective than the others in the prevention of radiation.

Objective To compare the expression of CD 49f splicing isoforms in different human stem cells and colon cancer cell lines , and construct lentiviral vectors overexpressing specific isoform .Methods The expression of CD49f isoforms in different cells was detected by RT-PCR and real-time PCR.The lentiviral vectors overexpressing CD49f isoforms were constructed by molecular cloning method .The overexpression of CD49f in colon cancer cell line HT29 was confirmed by FCM, Western blot and real-time PCR, the invasive ability was examined by transwell assay.Results CD49f splicing isoform B was highly expressed in H 9 human embryonic stem cell line , while iso-form A expressed in epithelial cells .Both isoform A and B were expressed in mesenchymal cells .CD49f isoforms A and B were also expressed in colorectal cancer cell lines , while HT29 and HCT116 showed higher expression of iso-form A than isoform B , HCT8 and LoVo showed higher expression of isoform B than isoform A .Overexpression of CD49f isoform B greatly increased the invasive ability of HT 29 cells, while isoform A showed no effect .Conclusions The expressions of CD49f splicing isoforms A and B in different types of cells are significantly different , which sug-gests that CD49f isoforms play different biological functions in cells .

Programmed death receptor-1 inhibitor pembrolizumab can restore the function of T cell activity and enhance the anti-tumor immune response by inhibiting the binding of PD-1 to its ligand PD-L1 and blocking the negative regulation of signal pathway. The activated T cells may cause immune-mediated adverse events in the process of anti-tumor. This article reported the severe immune related adverse effects induced by PD-1 inhibitor, pembrolizumab, in a patient with advanced ampullar carcinoma. The patient eventually died due to liver injury, leukocytosis,thrombocytopenia,and disseminated intravascular coagulation (DIC). This article reviewed the diagnosis and treatment of the patient, and reviewed the relevant literatures.

This study was purposed to investigate the reversal effect of gambogic acid (GA) on multidrug resistance of K562/A02 cells and its mechanism. The IC(50) (half maximal inhibitory concentration) of adriamycin (ADM) was evaluated by MTT. Cell apoptosis was detected by flow cytometry. Morphological changes of K562/A02 cells were observed by fluorescent microscopy with DAPI staining. The expressions of Survivin and P-gp were determined by Western blot. The results showed that the IC(50) of ADM on K562 and K562/A02 cell proliferation were (1.42 ± 0.07) µg/ml and (28.42 ± 1.40) µg/ml respectively. GA ≤ 0.0625 µmol/L had no inhibitory effect on proliferation of K562 and K562/A02. 0.0625 µmol/L GA could enhance the sensitivity of K562/A02 cells to ADM (P < 0.05) and the reversal multiples was 1.53. The apoptotic rate was raised after treating with ADM combined with 0.0625 µmol/L GA for 48 h (P < 0.05). Morphological differences were typical and obvious between cells of control and treated groups under fluorescence microscopy using DAPI staining. After treating K562/A02 cells with ADM combined with 0.0625 µmol/L GA for 48 h, the expressions of Survivin and P-gp were down-regulated at protein levels. It is concluded that GA can enhance the sensitivity of K562/A02 cells to ADM, which may be related to increasing cell apoptosis and down-regulating expressions of Survivin and P-gp.
Apoptosis ; drug effects ; Doxorubicin ; pharmacology ; Drug Resistance, Multiple ; drug effects ; Drug Resistance, Neoplasm ; drug effects ; Gene Expression Regulation, Leukemic ; Humans ; Inhibitor of Apoptosis Proteins ; metabolism ; K562 Cells ; Substance P ; metabolism ; Xanthones ; pharmacology

To observe the effects of blood serum from rats with radiation injury, thermal injury and combined radiation-thermal lesions on growth of hematopoietic progenitor cells and the change of their serum cytokine levels, total body irradiation of rats was performed with 12 Gy gamma ray from a (60)Co source, and 30% total body surface area III degree thermal lesion on the back was inflicted with a 5 kW bromotungsten lamp. The blood serum from these animals was collected at 3, 12, 24, 48, 72 and 96 hours after injury. Then the blood serum was added to the culture medium of erythrocyte progenitor cells (CFU-E, BFU-E) or granulocyte-macrophage progenitor cells (CFU-GM) at final concentration of 10 microg/ml. The results showed that the colony number of CFU-E, BFU-E and CFU-GM formed after addition of the blood serum from rats with thermal or combined radiation-thermal injury was significantly higher than that from normal rats at 3, 12, 24, 48, 72 and 96 hours after injury and reached its peak value at 24 hours after injury (342.8, 261.6 and 228.4% respectively from burned rats, 252.4, 205.1 and 174.2% respectively from rats with combined radiation-thermal injury as compared with that of normal rats). However, a few CFU-E, BFU-E or CFU-GM formation was found after addition of the blood serum from irradiated rats. At the same time, the level of TNF alpha and IL-6 in serum of burn group and combined radiation-thermal injury group was markedly higher than that of normal group, even more higher than that of irradiation injury group (P < 0.01). It is concluded that the blood serum from rats with thermal lesion or combined radiation-thermal injury improves the growth of erythrocyte and granulocyte progenitor cells. On the contrary, the blood serum from the irradiated rats shows the inhibiting effects, definitely related to their serum cytokines changes.
Animals ; Burns ; blood ; Cell Proliferation ; drug effects ; Cells, Cultured ; Culture Media ; chemistry ; pharmacology ; Hematopoietic Stem Cells ; cytology ; drug effects ; Male ; Mice ; Multiple Trauma ; blood ; Radiation Injuries ; blood ; Rats ; Rats, Wistar ; Serum ; chemistry ; Time Factors

OBJECTIVETo understand the risk factors on severe acute respiratory syndrome (SARS) among their contacts and to develop effective strategy for its control.

METHODSAvailable epidemiological data of SARS cases and close contacts were reviewed and analyzed by SPSS.

RESULTSOut of the 2195 close contacts, 138 (6.3%) were diagnosed as SARS. Among colleagues and classmates of SARS patients, the infection rate was 0.36% versus 31.71% in contacts among families and hospitals, 0.77% in schools. No one was infected among 459 close contacts to SARS in the working unit.

CONCLUSIONSAmong close contacts, factors that facilitating transmission would include: time, extent, frequency and place of contact to the patients, as well as factors related to close contacts as way, time of isolation and age. One of the epidemiological characteristics was that SARS were as clustered in the family among those close contacts. It is important to control the spread of SARS through supervision on the close contacts to patients.

Adult ; Aged ; China ; epidemiology ; Contact Tracing ; Cross Infection ; transmission ; Family Health ; Female ; Humans ; Infectious Disease Transmission, Patient-to-Professional ; Male ; Middle Aged ; Patient Isolation ; Quarantine ; statistics & numerical data ; Retrospective Studies ; Risk Factors ; Severe Acute Respiratory Syndrome ; epidemiology ; prevention & control ; transmission

OBJECTIVE: To investigate the effects of LASS2/TMSG1 gene overexpression on proliferation and apoptosis of human lung cancer A549 cells and explore the possible mechanism. METHODS: We examined LASS2/TMSG1 expression level in a previously constructed A549 cell line overexpressing LASS2/TMSG1 using Western blotting. The proliferation and apoptosis of the cells were detected using colony-forming assay, CCK-8 assay, Hoechst/PI double staining and flow cytometry. Fourteen nude mice were randomized into 2 groups (n=7) to receive subcutaneous injection of A549 cells with or without LASS2/TMSG1 overexpression on the back of the neck, and the cell proliferation in vivo was observed. The expression levels of p38 MAPK protein and p-p38 MAPK protein in the xenografts were detected with Western blotting. ELISA was used to detect the levels of ceramide and p38 MAPK protein in cultured A549 cell supernatants and the xenografts in nude mice. RESULTS: Compared with the negative control cells, A549 cells with LASS2/TMSG1 overexpression had significantly lowered proliferation ability in vitro with increased early apoptosis rate (P < 0.05), and showed obvious growth inhibition after inoculation in nude mice(P < 0.05). Western blotting showed that in both cultured A549 cells and the xenografts in nude mice, LASS2/TMSG1 gene overexpression significantly increased the expression levels of p38 MAPK protein and p-p38 MAPK protein (P < 0.05); the results of ELISA also revealed significantly increased levels of ceramide and p38 MAPK protein in the cell supernatant andxenografts as well (P < 0.05). CONCLUSION Overexpression of LASS2/TMSG1 gene can significantly inhibit the proliferation and promote early apoptosis of human lung cancer A549 cells both in vitro and in vivo possibly by upregulating the expressions of ceramide and p38 MAPK protein to activate a signal transduction cascade.
Animals ; Humans ; Mice ; A549 Cells ; Apoptosis ; Cell Line, Tumor ; Cell Proliferation ; Lung Neoplasms ; Membrane Proteins/metabolism* ; Mice, Nude ; p38 Mitogen-Activated Protein Kinases/metabolism* ; Signal Transduction ; Tumor Suppressor Proteins/metabolism*

Objective: To evaluate long-term clinical outcomes of consecutive patients treated with coronary artery bypass grafting (CABG) and percutaneous coronary intervention(PCI) with drug-eluting stents(DES) for ostial/shaft lesions in unprotected left main coronary artery(ULMCA). Method: A total of 259 patients with isolated ostial/midshaft lesions in unprotected left main coronary artery were enrolled consecutively who received DES implantation or underwent CABG between January 2003 and July 2009 in Beijing Anzhen Hospital. The endpoints of the study were death, repeat revascularization, myocardial infarction (MI) and stroke. Time to the primary endpoint was evaluated according to the Kaplan-Meier method, and the log-rank test was applied to compare the incidence of the endpoint. Adjusted risks for adverse outcomes were compared by multivariate Cox proportional hazard regression analyses. Results: A total of 259 patients were included, including 149 in PCI group and 110 in CABG group. And 193(74.5%) cases were males.The age was (61.4±9.8) years old. The median follow-up was 10.1 years (interquartile range 8.3 to 11.2 years) in the overall patients. There were no significant difference for the incidence of death [37.0% vs. 43.1% ，P=0.143] , MI [34.0% vs. 19.4% ，P=0.866], stroke [6.4% vs. 11.7% ， P=0.732], repeart revascularization [33.6% vs. 39.9% ，P=0.522] between PCI group and CABG group before multivariate adjusting，according to the incidence calculated with Kaplan-Meier. After adjusting covariates such as age, left ventricular ejection fraction（LVEF） and serum creatine with multivariate Cox hazard regression model, there was still no significant difference between the two groups. Conclusions: PCI with DES is as effective and safe as CABG in patients with left main ostium/shaft lesion during a median follow-up of 10.1 years.
Aged ; Coronary Artery Bypass ; Coronary Artery Disease/surgery* ; Humans ; Kaplan-Meier Estimate ; Male ; Middle Aged ; Percutaneous Coronary Intervention ; Risk Factors ; Stroke Volume ; Treatment Outcome ; Ventricular Function, Left

Rheumatoid arthritis (RA) is an autoimmune disease driven by antigens and mediated by T cells. Collagen II (CII) and fibrinogen (Fib) are the two main antigens in the pathogenesis of RA. The antigen produced after citrulline modification (Cit) is also one of the inducements to induce the body to produce a pathogenic anti-citrulline protein antibody (ACPA). To provide a reference for RA-related research, this study intends to establish an RA animal model by using CII, Cit-CII, Fib, and Cit-Fib antigens, emulsification with complete Freund's adjuvant and immunization with DBA/1 mice, respectively, to compare the pathological characteristics of RA models induced by different antigens from the aspects of pathology, imaging and serum biochemistry. Animal welfare and experimental process are in accordance with the regulations of the Experimental Animal Ethics Committee of the China Academy of Chinese Medical Sciences. The results showed that the CII, Cit-CII, and Cit-Fib induced mice all had symptoms such as joint redness and swelling, and toe deformation and the clinical score and incidence rate were higher than those of the normal group. The CII group had the most serious lesions, with a incidence rate of 100%, and the Cit-CII and Cit-Fib groups had mild symptoms, with a incidence rate of 25% and 37.5%, respectively; pathological and imaging examination results showed that the joints of mice in CII-induced group showed severe synovial inflammation, cartilage and bone destruction, while those in Cit-CII and Cit-Fib group showed only slight inflammatory infiltration, joint cavity stenosis and bone destruction; the results of serum antibody detection showed that CII, Cit-CII and Cit-Fib groups all produced high levels of anti-cyclic citrullinated peptide (CCP) antibodies, among which, Cit-Fib group > Cit-CII group > CII group > Fib group, and both Cit-CII and Cit-Fib groups produced high levels of citrullinated epitope-specific antibodies, while the total IgG level was the highest in CII group; serum ELISA and RT-PCR analysis of joint tissue showed that the expression of pro-inflammatory factors and bone destruction-related molecules increased most significantly in the CII-induced group, followed by Cit-Fib and Cit-CII. The above results showed that among the four different antigens, the symptoms and conditions of arthritis in RA mice induced by CII were the most serious, and IgG instead of anti-CCP antibody was its typical immunological feature, and CII could be the first choice for the model of RA mice; Cit-Fib has certain immunogenicity, can partially induce the symptoms and conditions of RA arthritis in mice, and produce high-level anti-CCP antibody and anti-Cit-Fib antibody, which is more suitable for the study of citrulline-related RA; although Cit-CII has certain immunogenicity, the incidence, and severity of RA arthritis induced by Cit-CII in mice are low.