Adult ; Dust ; analysis ; Female ; Humans ; Male ; Middle Aged ; Neural Networks (Computer) ; Occupational Exposure ; Silicosis ; diagnosis ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ; methods

Background:The efficacy of traditional medicine on ulcerative colitis (UC) is often unsatisfactory, hence development of drug based on the pathogenic mechanism of UC becomes a hot topic in the research of UC.It has been revealed in recent studies that activation of nuclear factor-κB (NF-κB) is implicated as a key regulator in the immune and inflammatory responses in UC.Aims:To explore whether bortezomib, a potent proteasome inhibitor that inhibits NF-κB activation can be used for treatment of UC.Methods:Thirty-two BALB/c mice were used to induce acute experimental colitis by drinking 3%dextran sulfate sodium (DSS) freely for 7 days, and then randomly allocated into four groups injected intraperitoneally with 0.2 (low-dose group), 0.6 (medium-dose group), 1.0 mg/kg (high-dose group) bortezomib and normal saline (model control group), respectively.On the 7th day after treatment, the disease activity index (DAI) and histopathological change of colonic tissue were observed;the colitis-related parameters including peripheral blood hemoglobin (Hb), C-reactive protein (CRP) and colonic myeloperoxidase (MPO) activity were measured, and the nuclear translocation of NF-κB was assessed by electrophoretic mobility shift assay.Results:Compared with the model control group, the DAI, CRP, MPO activity, and injury score of colonic tissue were decreased gradually, and the Hb was increased gradually in mice treated with low-, medium-and high-dose bortezomib (P all <0.05).The efficacy of medium-and high-dose bortezomib was notable.In mice treated with medium-and high-dose bortezomib, nuclear translocation of NF-κB was inhibited obviously.Conclusions:Bortezomib can modulate the colonic inflammation in mice with experimental colitis by inhibiting NF-κB activation and subsequently improving the clinical manifestations, colitis-related parameters and tissue damage.Increasing the dosage of bortezomib in a safety range may enhance the treatment response.

Objective To screen the flocculatnt-producing strain from activated sludge that can treat azo dyeing wastewater effectively.Methods Screening and rescreening were used to acquire the strain which possesses high efficiency of flocculatant production and the strain was identified.The character of microbial flocculant(MBF) and the ability to treat azo dye wastewater were studied.Results A strain of high-efficiency bioflocculant-producting bacteria(AJ-6),initially identified as Alcaligenes sp,was screened.The bioflocculant produced by the strain was able to flocculate kaolin suspension with 94.4% and fly ash suspension with 98.9% respectively.The flocculation activity distribution tests showed that the active components of the bioflocculant existed in the supernatant fluid after centrifugation.It had good treatment efficiency in treating azo dyes methyl orange wastewater.The maximal efficiencies of removing CODCr and chroma from the wastewater were 81.3% and 94.2%.Compared with the other flocculants,the performance of MBF was better than that of polyacrylamide(PAM),aluminum sulfate,ferrous sulfate.The MBF was more thermostable when treated with 100 ℃ for 30 min,and the animal toxicity test showed that the MBF had no acute toxicity to mice.Conclusion The bioflocculant produced by the strain AJ-6 is applicable to treat azo dyeing wastewater and can be also used for the other wastewater.

Background Establising the culture model of Müller cells for obtaining the highly putified target cells is essential for the study about the physiology and pathology of retinal Müller cells. The exsiting purifing method for culturing Müller cells is dissatisfactory. Objective This study was to establish a method to obtain high purifing Müller cells. Methods The retina from 5 clean newborn SD rats were isolated and digested by 0. 01% trypsin and cultured in DMEM containing 10% fetal bovine serum. The cellular suspension was then prepared,and the target cells were screened using flow cytometry based on the size and the quantity of cells. Cultured and passaged cells were identified by transmission electron microscope and light microscope. Immunocytochemistry was used to detecte the expression of GFAP in cultured cells for the determination of type and purity of the cells. Results The cells showed the similar shape to retinal Müller cells after primarily culture with the large volume, and some small other types of cells could been seen. The growth of cells was quickly 3 weeks later. The fibroblasts were removed using sticking-wall by steps,and neurons were eliminated following passage. Aboundent of cellular organs were seen under the transmission electron microscope. The positive response rate of the cells for CFAP was 100%. Conclution Flow cytometry offer a rapid and feasible approach for purifying Muller cell and it builds the foundation for further study about Müller cells.

OBJECTIVETo investigate clinical outcomes of Kirschner wire as blocking screws combined with interlocking intramedullary nail internal fixation in treating tibial metaphyseal fractures (AO 43A).

METHODSFrom March 2011 to June 2012, 9 patients with tibial metaphyseal fractures were treated with blocking screws Kirschner wire combined with interlocking intramedullary nail, including 7 males and 2 females aged from 23 to 54 years old with an average of 37.4. Postoperative complications, X-ray were observed, AOFAS scoring were used to evaluate function after operation at 12 weeks.

RESULTSAll patients were followed up from 6 to 40 weeks (mean 20.1), and healed at stage I. No serious swelling, infection and skin necrosis occurred. No fracture instability and displacement appeaered at 4 and 8 week after operation. AOFAS score was (95.2±4.6) at 12 weeks after operation and 7 patients gained excellent result and 2 patients good.

CONCLUSIONKirschner wire as blocking screws with interlocking intramedullary nail for treatment of tibial metaphyseal fractures can fix well and perform simply.

Adult ; Bone Screws ; Bone Wires ; Female ; Fracture Fixation, Intramedullary ; methods ; Humans ; Male ; Middle Aged ; Tibial Fractures ; surgery

Objective To investigate the effects of all-trans retinoic acid (ATRA)-intragastric-administration on the survival time of mouse skin allografts and the role of interleukin (IL)-23 and IL-17 thereof. Methods The skin trans-plantation of mice was done by DBA/2 as donors and Balb/c as recipients. The recipients were divided randomly into three groups:control group, low-dose group and high-dose group. Mice of the corresponding groups were intragastrically adminis-tered corn oil, 10 mg/kg ATRA and 30 mg/kg ATRA respectively from 1 day before the transplantation to the 14th day after the transplantation. The survival time of transplanted skin was observed after the operations. Skin grafts of mice were harvested for histopathological examination in three groups. The serum levels of IL-23 and IL-17 were measured by enzyme-linked im-munosorbent assay (ELISA). The expression levels of IL-23, RORγt and IL-17 mRNA in skin allografts were detected by re-al-time fluorescent quantitative reverse transcriptase polymerase chain reaction (RT-PCR). Results Compared with con-trol group, the average survival time of mouse skin allografts was significantly prolonged in low-dose group and high-dose group (P＜0.05). The less lymphocyte infiltration and destruction of architecture were found in the skin biopsies. The serum expression of IL-23 protein was lower (P＜0.05), but no significant difference was found in two treatment groups. The serum expression levels of IL-17 protein were reduced in turn in receptors of control group, low-dose group and high-dose group (P ＜ 0.05). The expression levels of IL-23, RORγt and IL-17 mRNA in skin grafts were significantly lower in low-dose group and high-dose group than those of control group (P＜0.05), but no significant difference was found in two treatment groups. Conclusion ATRA can effectively prolong the survival time of skin allografts, which may related with the inhibi-tion of the expression of IL-23, RORγt and IL-17 mRNA and the development of IL-23 and IL-17 protein.

BACKGROUND:Immunity of fetal liver stem cel transplantation is rarely reported, syngeneic and al ogeneic fetal liver stem cel transplantation in the treatment of hepatic cirrhosis is stil unclear.
OBJECTIVE:To observe the therapeutic effects of syngeneic and al ogeneic fetal liver stem cel transplantation on hepatic cirrhosis as wel as immune rejections during the therapeutic process.
METHODS:The fetal liver stem/progenitor cel s from BALB/c and C57BL/6 mice were isolated and purified by the type IV col agen enzyme digestion method. A total of 104 healthy BALB/c mice were randomly assigned to four groups. Normal control group:no treatment;Hepatic cirrhosis group, syngeneic transplantation group and al ogeneic transplantation group:16 weeks after hepatic cirrhosis models of mice were developed by intraperitoneal injection with carbon tetrachloride, physiological saline, syngeneic fetal liver stem cel s and al ogeneic fetal liver stem cel s were injected via the caudal vein. Final y, the survival statuses, liver function, hepatic fibrosis index, the number and ratio of immune cel s (CD4+T, CD8+T, NK, NKT) and histopathologic examinations were compared in each group after transplantation 4 weeks.
RESULTS AND CONCLUSION:The survival rates in the two transplantation groups were both 100%, which was significantly higher than that in the hepatic cirrhosis group (67%, P<0.05). The liver function and liver fibrosis index in each group did not show statistical differences (P>0.05). Immunological tests showed no difference between groups (P>0.05). Pathohistology examination of hepatic tissue repair:Al ogeneic transplantation group>syngeneic transplantation group>hepatic cirrhosis group. Hence, fetal liver stem cel transplantation via the caudal vein could elevate the survival rate of hepatic cirrhosis mice, al eviate the degree of hepatocyte necrosis. There is no immunologic rejection during syngeneic and al ogeneic fetal liver stem cel transplantation that could help to treat hepatic cirrhosis in mice.

Objective To establish a stable transplantation tolerance model by combined treatment with PTD-mFoxp3 fusion protein and allogeneic bone marrow transplantation and study its application to reduce the incidence of graft-versus-host disease (GVHD).Method BALB/c mice as recipients were randomly divided into four groups,accepted medical linear accelerator ray 3.0-Gy total body irradiation (TBI) before bone marrow transplantation (BMT),and injected with donor C57BL/6 mice bone marrow cells 3 × 107withinn 4-6 h.The BALB/c mice in group A were given PTD-mFoxp3 fusion protein through tail vein intermittently (day-2,0,1,3,5,7,9,11,13),those in group B given the same dose mFoxp3 protein,those in group C given normal saline,and those in blank control group given no treatment.The symptoms of GVHD were observed after BMT.Chimerisms were determined on the week 1,2,4,8 and12 post-BMT by flow cytometry.Liver and intestinal tissues were collected for pathological examination.Recipient immune response was assessed on the week 4 and 12 by mixed lymphocyte reactions (MLR) after BMT.Results The chimerism level in group A was high [(38.16 ± 3.09) ％] in the first 12 weeks after BMT,and that in group B and group C was reduced [(20.12 ± 4.75) ％ and (15.72 ± 2.36) ％ respectively,P＜0.05].MLR revealed that shown lymphocyte donor-derived lymphocyte proliferation rate at 4th and 12th week in group A was significantly lower than in other groups (P＜0.05).Pathological examination showed infiltration of lymphocytes in the liver and intestine was milder in group A than in other groups.Conclusion PTD-mFoxp3 fusion protein combined with allogeneic bone marrow transplantation can effectively establish a stable transplantation chimeric model and reduce the incidence of GVHD.

Background and purpose:Chemotherapy is the important way of breast cancer treatment, but the drug-resistance has attracted special attention. The emergence of drug resistance is closely related to the abnormal enhancement of DNA-damage repair. Both Kif4A and PARP-1 are important molecules of DNA repair. The research investigated the function of Kif4A in epirubicin up-regulating the activity of PARP-1 in breast cancer cells and possible significance. Methods:Western blot was used to detect the expression of Kif4A and PARP-1 after treatment with epirubicin in MDA-MB-231 and MCF-7 cells; the expression of PARP-1 and its activity were detected after high expression of Kif4A and treatment with epirubicin;FCM was used to detect cell apoptosis after treatment with epirubicin combined with PARP-1 inhibitor 3-ABA. Results:Epirubicin up-regulated PARP-1 activity and induced low expression of Kif4A in breast cancer cells, both of them showed dose-dependent and time-dependent. After high expression of Kif4A, the activity of PARP-1 was inhibited and the apoptosis of cells increased, epirubicin partially reversed the activity of PARP-1 inhibited by high Kif4A expression. Both of epirubicin and 3-ABA induced cell apoptosis, combination of them further increased cell apoptosis compared with alone used (P<0.05). The results also showed the apoptosis rate of MDA-MB-231 cells induced by epirubicin, PARP-1 inhibitor 3-ABA and high expression Kif4A was higher than that of MCF-7 cells (P<0.05). Conclusion:Epirubicin increases the activity of PARP-1 dependent on the low expression of Kif4A in breast cancer cells. Kif4A might become a novel target for overcoming resistance of epirubicin.

avian influenza virus (AIV) can not only infect avian and cause pandemics,but also result infection and initiate pandemics in humans and other mammal animals,crossing the species barrier.There have been some advance in research into the nonspecific species barrier of human respiratory tract against AIV infection and the mechanism of the infection of AIV in humans in recent years.