Hot Temperature ; Humans ; Occupational Exposure ; Occupational Medicine ; standards

ObjectiveTo investigate the loss of heterozygosity (LOH) on 6q in bladder tumor.MethodsD6S404 and D6434 microsatellite markers near 6q21 were tested by PCR-SSLP-stain method on tumor DNA from 31 cases of bladder tumor.ResultsAmong these 31 cases of bladder tumor,LOH was detected in tumor tissues on site for D6S404 (35.5%) and D6S434(22.6%).ConclusionOne or more tumor suppressor gene near 6q21 maybe relevant for the development of bladder tumor.

At present, there is no cure for acquired immune deficiency syndrome (AIDS) due to HIV-1 latent reservoirs. Therefore, it urgently requires novel HIV-1 latency-regulating agents with high potency, low toxicity and favorable drug-like properties to achieve a functional cure for AIDS. Herein, we reviewed the advances in HIV-1 latency-regulating agents since 2019, including the drug discovery strategies, bioactivities, and mechanisms of these compounds. It is of great guiding significance in the development of latency-regulating agents with clinical value.

Objective To explore the relationship between physical activity(PA) and the risk of colon cancer. Methods Cohort studies on physical activity and risk of colon cancer were identified by searching MEDLINE, EMBASE, Chinese Bio-medicine and Chinese Wanfang databases from January 1979 to December 2009. Results from the individual studies were synthetically combined in our study. Inverse variance weighting was used in fixed effects model and the random effects estimate was based on the DerSimonian-Laird method. Variance-weighted least squares method was used for trend test of summarized dose-response data. Results A total of 28 studies were included in our analysis. An inverse association between physical activities and the risk of colon cancer was observed with the relative risks (RR) as 0.75 [95% confidence interval (CI): 0.66-0.86] in males and 0.85(95%CI: 0.76-0.95)in females, respectively. However, the findings from those documents with high quality showed significant and borderline significant associations between PA and colon cancer in both males (RR=0.74, 95% CI: 0.61-0.90) and females (RR=0.99, 95% CI: 0.95-1.02). Meanwhile, the dose-response trend was not observed either in males (P=0.142) or in females (P=0.417). For men, the pooled RRs differed by subsites were 0.62(95%CI:0.45-0.85) and 0.74 (95%CI:0.56-0.99)for highest level PA, compared with lowest level PA in proximal colon and distal colon cancer,respectively. For women, the pooled RRs were 0.84 (95%CI: 0.69-1.01 ) in proximal colon and 0.75(95%CI: 0.53-1.05)in distal colon cancer, respectively. Conclusion These results added to the evidence for the protective effects in colon cancer among men and women.

Objective To develop a three-dimensional visual neurosurgical tool enjoying simple,fast and accurate characteristics at moderate cost for visual positioning and imaging information storage and processing. Methods Seven patients with epidural hematoma or depressed fracture resulted from severe craniocerebral trauma, 8 patients with hypophysoma, 5 with glioma and 3 with meningeoma were chosen in our study; CT three-dimensional reconstruction of their imaging data were performed and used for preoperative planning before surgery assisted by neurosurgical station.According to CT three-dimensional reconstruction results, appropriate neurosurgical approach was planned and patients were treated by surgery. Results Neurosurgical station performed three-dimensional reconstruction could show three-dimensional quantitative relationship between the above lesions and anatomical landmarks directly,which could help direct positioning and designing the best-individualized approach to improve the surgical accuracy and efficacy. Neurosurgical station could improve the efficiency of scientific research and clinical work by managing,storing,editing and using the imaging and video of the patients. Conclusion Neurosurgical station, which can show three-dimensional quantitative relationship between the above lesions and anatomical landmarks directly, is a simple, fast and accurate preoperative planning and information processing tool for clinical neurosurgical practice.

OBJECTIVETo investigate the role of Wnt/β-catenin signaling in aging of mesenchymal stem cells (MSCs) of rats.

METHODSSerum samples were collected from young (8 ≈ 12 w) and aged (64 ≈ 72 w) SD rat. Four experiment groups were assigned: young rat serum (YRS), YRS+Wnt 3a, old rat serum (ORS) and ORS+DKK1 groups. Immunofluorescence and Western blotting were used to detect the expression of intracellular β-catenin. The senescence-associated changes were examined with SA-β-galactosidase staining. The proliferation ability was tested by MTT assays. The survived and apoptotic cells were determined by AO/EB staining. The expressions of γ-H2A. X and p53 protein were detected by immunofluorescence and Western blotting. RT-PCR was used to detect the expression of p53 and p21 mRNA.

RESULTSCompared with the YRS group, the intracellular expression of β-catenin in the ORS group was significantly increased,especially in the nuclei of MSCs. After treatment of DKK1 in ORS, the γ-catenin expression was reduced. The number of SA-β-galactosidase positive MSCs was significantly higher in the YRS+Wnt 3a group than that in the YRS group (P<0.01), and the proliferative and survival ability of MSCs was significantly decreased in the YRS+Wnt 3a group. The number of SA-β-galactosidase positive MSCs in the ORS+DKK1 group was significantly decreased compared with that in ORS group (P <0.01), and the proliferative and survival ability of MSCs was significantly increased in the ORS+DKK1 group. The expression of γ-H2A.X, p53 and p21 was markedly increased in the ORS group than that in YRS group, however, after treatment with Wnt/β-catenin signaling inhibitor DKK1, the expression of γ-H2A.X, p53 and p21 was significantly decreased compared with that in the ORS group.

CONCLUSIONResults suggest that the Wnt/β-catenin signaling is activated in the MSCs cultured with ORS and excessive activation of Wnt/β-catenin signaling can promote MSCs aging. The DNA damage response and p53/p21 pathway may be main mediators of MSC aging induced by excessive activation of Wnt/β-catenin signaling.

Animals ; Cell Proliferation ; Cell Survival ; physiology ; Cells, Cultured ; Cellular Senescence ; physiology ; Mesenchymal Stromal Cells ; metabolism ; physiology ; Rats ; Rats, Sprague-Dawley ; Signal Transduction ; Tumor Suppressor Protein p53 ; metabolism ; Wnt Proteins ; metabolism ; beta Catenin ; metabolism

AIMTo synthesize a series of 2-arylimino-4-thiazolidone derivatives and 2-imidazolino [2,3-b]-4-thiazolidone in order to get some novel potent compounds with nitric oxide synthases (NOS) inhibitory activity.

METHODSThe target compounds were prepared by reaction of N-chloroacetyl-1,2,3,4-tetrahydroisoquinoline or N-chloroacetylphthalimide with substituted thioureas, their NOS inhibitory activity were measured.

RESULTS AND CONCLUSIONThe 15 new compounds were synthesized and most of the reaction yields were over 65%. The structures of new compounds were identified by IR, 1H NMR, MS and elemental analyses. Bioassay indicated that, most of 15 new compounds synthesized had confirmed bioactivities inhibition against NOS.

Molecular Structure ; Nitric Oxide Synthase ; antagonists & inhibitors ; metabolism ; Structure-Activity Relationship ; Thiazoles ; chemical synthesis ; chemistry ; pharmacology ; Thiourea ; analogs & derivatives

OBJECTIVETo explore the influence of oxidized high-density lipoprotein (oxHDL) on the maturation and migration of bone marrow-derived dendritic cells (BMDCs) from C57BL/6J mice.

METHODSThe C57BL/6J mice bone marrow cell suspension was prepared and purified. Recombinant granulocyte-macrophage colony-stimulating factor (rmGM-CSF) and recombinant interleukin-4 (rmIL-4) were used to promote monocytes to differentiate and suppress lymphocytes. Then 50 microg/mL oxHDL was added to stimulate BMDCs, using 50 microg/mL high-density lipoprotein (HDL) as homologous protein control, PBS as negative control, and 1 microg/mL lipopolysaccharide (LPS) as positive control. The CD86 and MHCII expression rates were detected with fluorescence-activated cell sorting (FACS). Liquid scintillation counting (LSC) was used in mixed lymphocyte reactions (MLRs) to reflect the ability of BMDCs in stimulating the proliferation of homologous T cells. Levels of cytokines IL-12 and IL-10 were detected by ELISA. The cell migration was evaluated with the transwell system.

RESULTSCompared with PBS group, the expressions of CD86 and MHCII, counts per minute of MLRs, secretion of IL-12 and IL-10, and number of migrated cells in oxHDL group and LPS group significantly increased (all P<0.05), while the increment was less in oxHDL group than LPS group. The number of migrated cells in oxHDL group was about twice of that in HDL group.

CONCLUSIONOxHDL may promote the maturation and migration of BMDCs in vitro.

Animals ; Bone Marrow Cells ; cytology ; drug effects ; physiology ; Cell Differentiation ; drug effects ; Cell Movement ; drug effects ; Cells, Cultured ; Dendritic Cells ; cytology ; drug effects ; physiology ; Humans ; Lipoproteins, HDL ; metabolism ; pharmacology ; Lipoproteins, LDL ; metabolism ; pharmacology ; Mice ; Mice, Inbred C57BL

OBJECTIVETo study the regulatory effect of Qinghuo Baidu Yin (QHBDY, a mixture prepared with Chinese drugs) on immune function of patients with extremely severe burn (ESB).

METHODSThirty patients with ESB were divided into two groups, conventional therapy was given to both groups, but QHBDY was given to the treated group additionally. Immunological indices, including peripheral blood T-lymphocyte subsets, immunoglobin (IgG, IgA and IgM) and complement (C3 and C4) were determined 3 weeks after treatment to evaluate and compare the therapeutical effect in the two groups.

RESULTSCompared with the control group, CD3, CD4, CD4/CD8, immunoglobin (IgG, IgA and IgM) and complement (C3 and C4) levels were markedly decreased in degree, and recovered earlier and quicker, with CD8 increased mildly (P < 0.01) and turned back more quickly. And so did the parameters of the treated group in comparing with that of the control group at anytime (P < 0.05 or P < 0.01).

CONCLUSIONChinese drugs mixture shows the regulatory effect on both cellular and humoral immune function in patients with ESB.

Adjuvants, Immunologic ; therapeutic use ; Adolescent ; Adult ; Burns ; drug therapy ; immunology ; Complement C3 ; Drugs, Chinese Herbal ; therapeutic use ; Female ; Humans ; Immunoglobulin G ; blood ; Male ; Middle Aged ; Phytotherapy

BACKGROUNDHypoxia-inducible factor-1alpha (HIF-1alpha) is a transcriptional factor that could improve the stimulation of angiogenesis and the metabolic adaptation of tumor cells to hypoxia. A recent study showed that HIF-1alpha could induce colon cancer cells epithelial-mesenchymal transition (EMT). However, no evidence indicates a similar correlation in human prostate cancer cells. This study was designed to evaluate the effect of HIF-1alpha over-expression on the EMT in human prostate cancer cells.

METHODSWe selected the appropriate cell line for HIF-1alpha induction from those EMT negative prostate cell lines through vimentin gene detection by RT-PCR. As the result, LNCaP cell line is the best one for further experiment. LNCaP cells were transfected with recombinant plasmid pcDNA3.1 (-)/HIF-1alpha and pcDNA3.1 (-) control vector by Lipofectamine 2000 system. The positive cell colonies were confirmed by indirect immunofluorescence labeling. Then Transwell polycarbonate filter was used to analyze the invasive potency. The expression of EMT associated proteins, E-cadherin and vimentin, was detected by Western blotting.

RESULTSAmong four of the EMT negative cell lines, LNCaP was the only one expressed the vimentin gene but not the associated protein. The expression level of HIF-1alpha in LNCaP/HIF-1alpha was distinctly higher than that in LNCaP/pcDNA3.1 and LNCaP. The cell numbers of LNCaP/HIF-1alpha that penetrated through the Transwell filter were higher than that of LNCaP/pcDNA3.1 and LNCaP. Compared with the LNCaP/pcDNA3.1 and LNCaP cells, the expression of vimentin was up-regulated in LNCaP/HIF-1alpha, whereas the expression of E-cadherin was down-regulated.

CONCLUSIONSOver-expression of HIF-1alpha stimulates the invasion potency of human prostate carcinoma cells through EMT pathway. The expression of E-cadherin and vimentin, playing established roles in EMT, could be regulated by HIF-1alpha in human prostate cancer cell line.

Cadherins ; genetics ; Cell Line, Tumor ; Epithelial Cells ; chemistry ; pathology ; Gene Expression Regulation, Neoplastic ; Humans ; Hypoxia-Inducible Factor 1, alpha Subunit ; physiology ; Male ; Mesoderm ; pathology ; Prostatic Neoplasms ; metabolism ; pathology ; RNA, Messenger ; analysis ; Vimentin ; genetics