Abstract: Nitrobenzene compounds (NBCs) are widely used in the world. It has 40 isomers such as nitrobenzene, dinitrobenzene and nitrotoluene, that are highly toxic and difficult to degrade and can cause harm to human health in different degrees. At pres⁃ ent, there is no unified standard method and occupational exposure limit for the detection of NBCs in the air. In terms of sampling medium, solid adsorption tube is mostly used for trapping vapor state NBCs, and filter membrane and solid adsorption tube are mostly used in series for sampling coexist NBCs in vapor state and aerosol state. In the detection methods, gas chromatography and liquid chromatography are common, and ultraviolet spectrophotometry, Raman spectroscopy, ion migration spectrometry and some other rapid response methods and technologies are also used in the detection of NBCs. In the detection of NBCs by gas chro⁃ matography, capillary column separation is commonly used, and the main detectors are flame ionization detector, electron capture detector and mass spectrometry detector. It is of practical significance to establish a method with high sensitivity, strong practica⁃ bility, convenient operation, and can simultaneously collect and detect a variety of NBCs in different states.

Cryptosporidium andersoni ATP-binding cassette (CaABC) is an important membrane protein involved in substrate transport across the membrane. In this research, the nucleotide binding domain (NBD) of CaABC gene was amplified by PCR, and the eukaryotic expression vector of pEGFP-C1-CaNBD was reconstructed. Then, the recombinant plasmid of pEGFP-C1-CaNBD was transformed into the mouse intestinal epithelial cells (IECs) to study the iron transportation function of CaABC. The results indicated that NBD region of CaABC gene can significantly elevate the transport efficiency of Ca2+, Mg2+, K+, and HCO3 - in IECs (P<0.05). The significance of this study is to find the ATPase inhibitors for NBD region of CaABC gene and to inhibit ATP binding and nutrient transport of CaABC transporter. Thus, C. andersoni will be killed by inhibition of nutrient uptake. This will open up a new way for treatment of cryptosporidiosis.
ATP-Binding Cassette Transporters/*chemistry/*genetics/metabolism ; Adenosine Triphosphate/metabolism ; Amino Acid Sequence ; Animals ; Calcium/metabolism ; *Cloning, Molecular ; Cryptosporidiosis/parasitology ; Cryptosporidium/chemistry/genetics/*metabolism ; Humans ; Iron/metabolism ; Mice ; Molecular Sequence Data ; Protein Structure, Tertiary ; Protozoan Proteins/*chemistry/*genetics/metabolism ; Sequence Alignment

OBJECTIVETo present an established human chordoma cell line for chordoma research.

METHODSThe specimens pathologically identified as chordoma were cultured, using primary tissue culture in vitro. The surviving cells were analyzed by morphology, histochemical stain, cell cycling analysis, karyotype analysis, electron microscopic observation, heterotransplantation and study of invasive capacity in vitro.

RESULTSThe newly established cell line CM-319 has been maintained in continual cultures for over 100 generations in two years. Its morphological observation, histochemical staining properties, electron microscopic observation and heterotransplantation showed the common characteristics of chordoma. The doubling time of cells was about 33 hours. Cell cycle analysis showed: G(1) 55.6%, G(2) 21.9% and S 22.5%, G(2)/G(1) = 1.90. Chromosome analysis showed a hypotriploid feature and the success rate of heterotransplantation was 100%. It is capable of invasion in vitro.

CONCLUSIONCM-319, as a cell line derived from human chordoma cells, may serve for further studies of chordoma.

Animals ; Cell Line, Tumor ; Cell Proliferation ; Chordoma ; genetics ; pathology ; Humans ; Mice ; Mice, Inbred BALB C ; Neoplasm Invasiveness

OBJECTIVETo study the effects of genistein on the proliferation, apoptosis induction and expression of related gene proteins of human colon cancer cells in vitro and in vivo, and its mechanisms of action.

METHODSMTT colorimetric assay was used to detect the effects of genistein on the proliferation of human colon adenocarcinoma SW480 cells. Light and transmission electron microscopy were used to study the histological and ultrastructural changes. Flow cytometry was used to determine the effects of genistein on cell cycle and apoptosis. Flow cytometry and immunohistochemistry were used to determine the effects of genistein on apoptosis induction and expression of related gene proteins of colon cancer cells.

RESULTSThe MTT colorimetric assay showed that genistein inhibited the proliferation of SW480 cells in a dose-dependent and time-dependent manner, and the highest inhibition rate was 60.2% after 80 microg/ml genistein treatment for 72 h. The light microscopy revealed that many genistein-treated cancer cells were shrunken, disrupted, or showing cytoplasmic vacuolization. The electron microscopic examination showed cell shrinkage, nuclear fragmentation and pronounced chromatin condensation, sometimes formed crescent chromatin condensation attached to the nuclear membrane. The results of flow cytometry showed that: after SW480 cells were treated with 0, 20, 40, 80 microg/ml genistein for 48 h, the FI values of PCNA were 1.49 +/- 0.02, 1.28 +/- 0.04, 1.14 +/- 0.03, and 0.93 +/- 0.08; the FI values of VEGF were 1.75 +/- 0.02, 1.34 +/- 0.06, 1.32 +/- 0.04, and 1.23 +/- 0.04; the fluorescence index (FI) values of p21 were 1.26 +/- 0.05, 1.36 +/- 0.06, 1.61 +/- 0.03, and 1.73 +/- 0.03, respectively. There were statistically significant differences between the control group and each treatment group (P < 0.05 or P < 0.01). The scores of immunohistochemical staining of PCNA and VEGF proteins were decreased, while p21 increased. There were statistically significant differences between the control group and each treatment group (P < 0.05 or P < 0.01).

CONCLUSIONGenistein can inhibit the growth of colon cancer cells via apoptosis induction and cell cycle arrest at G(2)/M phase. The anti-tumor mechanisms of genistein may be related with the down-regulation of expression of VEGF and PCNA, and up-regulation of the expression of p21.

Adenocarcinoma ; metabolism ; pathology ; Animals ; Anticarcinogenic Agents ; administration & dosage ; pharmacology ; Apoptosis ; drug effects ; Cell Cycle ; drug effects ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; Colonic Neoplasms ; metabolism ; pathology ; Cyclin-Dependent Kinase Inhibitor p21 ; metabolism ; Dose-Response Relationship, Drug ; Gene Expression Regulation, Neoplastic ; Genistein ; administration & dosage ; pharmacology ; Humans ; Male ; Mice ; Mice, Inbred BALB C ; Neoplasm Transplantation ; Proliferating Cell Nuclear Antigen ; metabolism ; Vascular Endothelial Growth Factor A ; metabolism

Objective - - To prepare the GDH 5 air sampling tube for simultaneous collection of eight kinds of chloro nitrobenzene （ ） ， compounds CNBs in the air of workplace and establish a matching determination method using gas chromatography. Methods - - ， Eight kinds of CNBs in vapor and aerosol state were collected by self developed GDH 5 air sampling tube desorbed ， ， ， by toluene separated by polysiloxane gas chromatography column detected by microcell electron capture detector and Results - （ - quantified by external standard method. It was determined that the air sampling tube was assembled by XAD 2 ion ） - ， exchange resin and glass fiber filter membrane. The linear range of CNBs was 0.80 240.00 mg/L and the linear correlation - - coefficients were greater than 0.999 9. The detection limit was 7.87 13.03 μg/L. The minimum detectable concentration was 0.60 3， - 3（ ） 1.33 μg/m and the minimum quantitative concentration was 2.00 4.22 μg/m sample 45.00 L . The average desorption - - （RSD） - ， - RSD efficiency was 101.2% 110.0%. The within run relative standard deviation was 0.8% 4.1% and the between run - Conclusion - was 0.3% 5.8%. The samples could be stored for more than 30 days at room temperature. GDH 5 air sampling tube and its associated determination method can be used for the collection and determination of eight kinds of CNBs in workplace air.

OBJECTIVETo set up a new process to access the preparation of decellularized artery grafts. And to evaluate the feasibility of decellularized artery allografts was evaluated.

METHODSThis study compared the effects of four extraction chemicals [1% t-octyl-phenoxypolyethoxyethanol (Triton X-100), 1% tri (n-butyl) phosphate (TnBP), and 1% sodium dodecyl sulfate (SDS) and trypsin (0.125, 0.25%) on thoracic artery vascular for 24 h (except trypsin for 2 h). At the base of it, a four-step process, including hypotonic, hypertonic solutions and combining with 1% Triton X-100 and 1% SDS detergents, were performed in rabbit thoracic artery vascular. Histological examination, tensile tests and expanding-burst tests were done on the samples. The decellularized carotid artery allografts were transplanted in other rabbits.

RESULTSTreatment with 1% SDS or 1% Triton X-100 for 24 h could remove most cells with retention of near normal structure. A four-step process could remove all cells with the extracellular matrix well conserved. The pulling mechanical properties and burst pressure of decellularized carotid artery were similar to the control. The decellularized carotid artery allografts (diameter of 2 mm) were patent at explanting up to 2 months.

CONCLUSIONSThe acellular artery vascular graft matrix is well prepared with four-step process including detergents, such as TritonX-100, SDS without compromising the graft structure or mechanical properties significantly. The carotid artery allografts (diameter of 2 mm) decellularized by the process are patent at explanting up to 2 months.

Animals ; Aorta, Thoracic ; cytology ; Bioprosthesis ; Blood Vessel Prosthesis ; Blood Vessel Prosthesis Implantation ; Carotid Arteries ; cytology ; transplantation ; Feasibility Studies ; Female ; Male ; Protease Inhibitors ; pharmacology ; Rabbits ; Sodium Dodecyl Sulfate ; pharmacology ; Tissue Engineering ; methods

OBJECTIVETo observe the association between job stress (effort-reward imbalance model)and blood lipids among university staff in Yunnan province.

METHODSA cross-sectional survey was conducted among 1244 university staff in Yunnan province. The job stress was measured by the validated Chinese self-reported Effort-Reward Imbalance Questionnaire (ERI). Blood lipids were measured in all participated staff members.

RESULTSAfter adjustment for relevant confounding factors, it was found that the risk of increased serum triglyceride was 3.5 folds higher in male staffs with high extrinsic effort compared those with low extrinsic effort (OR = 3.45, 95%CI: 1.32 - 9.04) while the risk of increased serum low density lipoprotein-cholesterol was 2.9 folds higher in male staffs with high overcommitment compared those with low overcommitment (OR = 2.86, 95%CI: 1.03 - 7.96). The risk of elevated serum triglyceride increased in proportion to increasing job stress: 3.5 folds increase in male staffs with moderate job stress (OR = 3.43, 95%CI: 1.24 - 9.53) and 4 folds increase in male staffs with high job stress (OR = 4.16, 95%CI: 1.42 - 12.17) compared those with low job stress. However, there was no significant association between job stress and lipid profile in female staffs.

CONCLUSIONOur results show that job stress (effort-reward imbalance) is positively associated with abnormal blood lipids in male university staffs.

Adult ; Cross-Sectional Studies ; Female ; Humans ; Lipids ; blood ; Male ; Middle Aged ; Stress, Psychological ; blood ; Surveys and Questionnaires ; Workload ; psychology ; statistics & numerical data

OBJECTIVETo establish a RT-PCR system for detecting mRNA expression level of 4 hsp genes in human cells.

METHODSRT-PCR system was established with gene cloning, gene recombination, in vitro transcription and RT-PCR techniques; The detection of expression level of 4 hsp genes in SW13 cell was carried out with this system.

RESULTSIn SW13 cell, hsp70 and hsp90 alpha were typical heat shock induced genes, while hsp60 and hsp90 beta were efficiently expressed and further induced by heat-shock to various extent.

CONCLUSIONSIn our hands novel RT-PCR system can be used to detect mRNA expression level of 4 human hsp genes.

Chaperonin 60 ; biosynthesis ; genetics ; HSP40 Heat-Shock Proteins ; HSP70 Heat-Shock Proteins ; biosynthesis ; genetics ; HSP90 Heat-Shock Proteins ; biosynthesis ; genetics ; Heat-Shock Proteins ; biosynthesis ; genetics ; Humans ; Leukemia, T-Cell ; metabolism ; pathology ; RNA, Messenger ; biosynthesis ; genetics ; Reverse Transcriptase Polymerase Chain Reaction ; Tumor Cells, Cultured

The objective of this study was to investigate the effect of hexamethylene bisacetamide (HMBA) on differentiation of HL-60 cells and its possible molecular mechanism. HL-60 cells were co-cultured with different concentrations of HMBA (0.5, 1, 2 mmol/L) for 4 days, then the proliferation was assayed by MTT at different time points. Wright-Giemsa staining was used to observe the change in morphology. Cell differentiation antigen CD11b expression and the altered distribution of cell cycle in HL-60 induced by HMBA were analyzed by flow cytometry. The expressions of c-myc, mad1, p21, p27, hTERT and HDAC1 mRNA were detected by RT-PCR. The results indicated that the proliferation of HL-60 cells was inhibited by HMBA in a time-and-dose-dependent manner. Upon 2 mmol/L HMBA treatment, the HL-60 cells arrested at G(0)/G(1) phase and differentiated into granular line in morphology, with the up-regulation of CD11b expression. The expression of c-myc and hTERT mRNA obviously down-regulated, the expression of p21, p27 and mad1 mRNA up-regulated, while there was no change of the expression of hTERT mRNA. It is concluded that effect of HMBA on the differentiation of HL-60 cells may partly contribute to switch from c-myc to mad1 expression, to up-regulate expressions of p21 and p27 mRNA, and down-regulate hTERT mRNA expression, while there is no relation with the expression of HDAC1 mRNA.
Acetamides ; pharmacology ; Antineoplastic Agents ; pharmacology ; Cell Cycle ; drug effects ; Cell Differentiation ; drug effects ; genetics ; Cell Proliferation ; drug effects ; HL-60 Cells ; Humans

OBJECTIVETo study the antigenicity of SARS associated coronavirus (CoV) spike S1 (12-672Aa) domain.

METHODSBALB/c mice were immunized with a plasmid bearing codon-optimized SARS-CoV (Tor2 strain) S1 domain and then boosted with purified S1 protein; the SARS-CoV specific IgG antibody was tested by ELISA and neutralization antibody was determined by in vitro microneutralization assay.

RESULTSS1 domain of SARS-CoV spike, which has been demonstrated harboring the receptor binding domain, successfully elicited SARS-CoV specific IgG antibody in mouse after combined immunization with DNA and purified S1 protein; the antibody elicited solely by S1 could potently neutralize SARS-CoV (HKU-39849) in vitro, 50% of 1 000 TCID50 SARS-CoV challenged cells were protected from viral infection by a 1:1499.68 dilution of mice sera immunized with S1 protein, but negative control sera showed no protection.

CONCLUSIONS1 domain of SARS-CoV spike protein, which is responsible for receptor binding, can efficiently and sufficiently induce highly potent neutralizing antibody in mice. This result suggested that S1 domain could be an effective subunit vaccines against SARS-CoV.

Animals ; Antibodies, Viral ; blood ; Cell Line ; Embryo, Mammalian ; Epithelial Cells ; metabolism ; Female ; Humans ; Immunization ; Immunoglobulin G ; blood ; Kidney ; cytology ; Membrane Glycoproteins ; genetics ; immunology ; metabolism ; Mice ; Mice, Inbred BALB C ; Neutralization Tests ; SARS Virus ; genetics ; immunology ; Severe Acute Respiratory Syndrome ; immunology ; virology ; Spike Glycoprotein, Coronavirus ; Transfection ; Viral Envelope Proteins ; genetics ; immunology ; metabolism