Objective To analyze the resistance genes in a muhidrug resistant Klebsiella pneumoniae (MDRKP) strain.Methods A MDRKP strain was isolated from bronchoalveolar lavage fluid in Pediatric Intensive Care Unit of Children's Hospital Affiliated to Soochow University in February 2012.Acquired resistance genes to beta-lactams,aminoglycosides,quinolones,ompK35 and ompK36 gene for outer membrane porin protein,and carbapenems targeting PBP2 gene were analyzed by PCR and verified by DNA sequencing.Results Acquired resistance genes TEM-1,SHV-1 to beta-lactam antimicrobial agents and aac(6′)-I b to aminoglycoside antimicrobial agents were positive in the strain of MDRKP.While 16S rRNA methylase,ompK35 and ompK36 genes for outer membrane porin protein were negative.Compared with susceptible strains,there were 9 synonymous mutations in PBP2 gene sequence of this MDRKP strain,but the amino acid sequences were the same.No mutation in quinolone resistance determining region (QRDR) was observed.Conclusion The multidrug resistance of the isolated Klebsiella pneumoniae strain may be related to 2 kinds of beta-lactam acquired resistance genes,1 kind of aminoglycoside acquired resistance gene,ompK35 and ompK36 genes defects and synonymous mutation in PBP2 gene.

Objective To observe and evaluate acute toxicities in a series of human immunodeficiency virus (HIV)-positive cancer patients receiving radiation therapy.Methods The study retrospectively reviewed the acute radiation reaction of radiation therapy of 14 HIV seropositive patients diagnosed with carcinoma between Feb 2008 and Dec 2013 at the Yunnan Tumor Hospital during the radiotherapy period and 1 month following treatment.Acute adverse effects were classified according to the site of radiation therapy and analyzed using the Common Terminology Criteria for Adverse Events (CTCAE) version 3.0.Results Seven patients experienced interruptions or delays in treatment,and 2 stopped treatment entirely.The most common acute adverse effects were skin reactions and mucous membrane reactions,including dermatitis,stomatitis or diarrhea.Eight patients had grade 3 acute adverse effects,including 6 patients with grade 3 skin reactions and 2 patients with grade 3 mucosa reactions.Conclusions Radiotherapy is an effective treatment for HIV positive patients with tumors,however it frequently induced severe acute radiation responses.

Objective To investigate the therapeutic effect of argon-helium cryoablation combined with transcatheter arterial chemoembolization (TACE) for primary hepatocellular carcinoma (HCC) and its influence on vascular endothelial growth factor (VEGF) level, and to compare it with simple TACE treatment. Methods During the period from Aug. 2013 to Aug. 2014 a total of 50 patients with primary HCC were admitted to Hunan Provincial People’s Hospital. The patients were randomly and equally divided into group A (TACE group, n=25) and group B (argon-helium cryoablation+TACE group, n=25). VEGF levels in the peripheral blood were determined before and after the treatment, and the results were statistically compared between the two groups. Results After the treatment the VEGF level in group A was significantly increased when compared with preoperative VEGF level (P<0.05). In group B, the VEGF level was decreased after the treatment, which was statistically significant lower than the preoperative VEGF level (P<0.05). The differences in VEGF level between the two groups were statistically significant (P<0.05). Conclusion The statistic analysis of VEGF levels indicates that argon-helium cryoablation combined with TACE is probably superior to simple TACE in the inhibition of tumor angiogenesis.

Objective To explore the changes in cardiac index and oxygenation index in sepsis piglets after nitric oxide (NO) gas inhalation. Methods A piglet model of sepsis was induced by intravenous infusion of Gram-negative bacterial endotoxin (LPS), then the piglets were randomly divided into two groups. NO group (n=8) was administered with inhaled nitric oxide of 80ppm via volume control (VC) mechanical ventilation for one hour, while the control group (n = 4) received mechanical ventilation with VC and was observed for one hour to assess the stability of the model. The parameters of oxygenation and hemodynamics were measured by PICCO and arterial blood gas analysis every fifteen minutes for one hour. Results Injection of endotoxin induced a stable pig model of sepsis. PH, HCO3-, arterial oxygen pressure (PaO2), mean arterial pressure (MAP) and cardiac index in this model were significantly lower the baseline values (P < 0.01). Arterial oxygen pressure and cardiac index were significantly higher in N0 group than in the control group (P<0.01). Heart rate (HR), central venous pressure (CVP), global end-diastolic volume index (GEDI) and intrathoracic blood volume index (ITBI) did not significantly differ between NO group and the control group. Conclusions Inhalation of nitric oxide gas can significantly improve oxygenation and cardiac function in piglets with sepsis.

OBJECTIVETo study the properties of orthodontic rectangular arch wires in torsion.

METHODSBy using the torsion measurement apparatus, torsion moments and angles of four kinds of orthodontic wires (0.46 mm x 0.63 mm and 0.48 mm x 0.63 mm stainless steel wires, and the same size nickel-titanium wires) were tested respectively in a 0.56 mm-slot first maxillary incisor bracket. According to the torsion moments and angles, scatter graphs were drawn to fit the load-deflection curves of four kinds of wires and their linear equations were calculated. According to the equations, the torsion stiffness and the play angles of the wires at 20 N mm correspondingly were calculated.

RESULTSThe torsion stiffness of four kinds of wires were 4.909, 6.417, 1.325 and 1.363 N mn/degrees, the torsion angles of different wires were 19.14 degrees, 15.33 degrees, 36.83 degrees and 35.07 degrees at 20 N mm respectively.

CONCLUSIONThe torsion stiffness of stainless steel wires was bigger than that of the same cross-section dimensional nickel-titanium wires. The difference of torsion stiffness between two dimensional nickel-titanium wires is smaller, while the difference of torsion stiffness between two stainless steel wires is larger.

Incisor ; Nickel ; Orthodontic Wires ; Stainless Steel ; Titanium

Objective To observe and compare the effects of 4 kinds of different processed products of Radix Rehmanniae (RR) Preparata on the phenomenon of bored of growing stomach in rats.Methods Four kinds of different processed products of prepared RR were selected and named as following:Shudihuang-A (steamed RR);Shudihuang-B (stewed with wine RR Preparata and RR);Shudihuang-C (nine steamed nine sun Shudihuang RR Preparata);Shudihuang-D[RR nine steamed nine sun (Que Sharen)].The Shudihuang decoction in A,B,C,D groups were preparation.SD rats were intragastrically administrated for 14 d after fasting 24 h with carbon semisolid paste each 0.5 g by gavage.After 30 min,the gastrin in serum,plasma motilin and content of substance P were determined by ELISA.After blood collection,the abdominal cavity was exposed,and the gastric net weight was calculated.Results The residual rate of gastric contents in rats of blank group was (3.18 ±0.22)％,the residual rate of gastric contents in rats of Shudihuang-A,-B,-C,-D groups were (3.78 ±0.27)％,(1.90 ±0.16)％,(2.40 ± 0.78) ％,(2.65 ± 0.67) ％ respectively with significance (P ＜ 0.05 in A-group,P ＜ 0.01 in B,-C,-D groups).Compared with A-group,the difference in B-group with significance(P ＜0.01).The content of gastrin in blank group was (146.19 ± 123.51) pg · mL-1,the content of gastrin in rats of Shudihuang-A,-B,-C,-D groups were (131.50 ±59.94),(151.97 ± 120.49),(233.46 ± 15.99),(179.18 ±36.02) pg · mL-1 respectively with significance(P ＜ 0.05 in Shudihuang-A group,P ＜ 0.01 in Shudihuang-C,-D groups).Compared with C-group,the difference in D-,A-,B-groups with significance(all P ＜ 0.01).Compared with A-group,the difference in B-group with significance (P ＜ 0.01).The plasma motilin content in rats of blank group was (84.14 ± 125.93)pg · mL-1,the plasma motilin content in rats of Shudihuang-A,-B,-C,-D groups were (81.91 ± 313.77),(87.30 ± 67.10),(188.68 ± 32.59),(170.08 ± 83.08) pg · mL-1 respectively with significance(all P ＞ 0.05 Shudihuang-A,-B groups;all P ＜ 0.01 in Shudihuang-C,-D groups).Compared with C-group,the difference in D-,A-,B-groups with significance(all P ＜0.01).The substance P content ofin rats of blank group was (19.82 ± 13.87) pg · mL-1,the substance P content of in rats of Shudihuang-A,-B,-C,-D groups were (13.38 ±6.47),(23.01 ±10.41),(37.46±0.44),(29.93±7.77) pg· mL-1 with significance(P ＜ 0.05 in Shudihuang-A group with decreased while Shudihuang-B,-D groups with increased;P ＜ 0.01 in Shudihuang-C group with increased).Compared with C-group,the difference in D-,A-,B-groups with significance (all P ＜ 0.01).Conclusion The bored of growing stomach phenomenon caused by steamed Shudihuang is most serious in rats.The nine steamed nine sun Shudihuang can effectively eliminate greasy effect in rats by increasing the contents of gastrin,motilin,substance P and reducing the residual of gastric contents in rate.

OBJECTIVETo investigate the bending mechanical properties and provide reference for orthodontists to select the proper wires during alignment stage.

METHODSIn order to analyze the load deflection rate of NiTi round wire quantitatively, some NiTi round wires of different cross-sectional dimension (0.36, 0.41, 0.46 mm) were selected. Then loading-unloading experiments were carried out with the micro-orthodontic archwire testing apparatus and double end bending test could be accomplished with the wire in a 0.56 mm x 0.71 mm standard incisor edgewise bracket slot.

RESULTSUnder the load of 0.03 N.m, 0.36 and 0.41 mm NiTi round wire showed excellent super-elasticity, while 0.46 mm NiTi round wire didn't. When the optimal moment produced by the archwire was between 0.01 N.m and 0.02 N.m, the bending range of 0.36, 0.41 and 0.46 mm NiTi round wires was from 21.0 degrees to 49.5 degrees , 7.2 degrees to 23.7 degrees , and 6.5 degrees to 9.5 degrees , respectively after deducting the contact angle.

CONCLUSIONSOn the premises of yielding effective orthodontic force, the preferable NiTi round wire for alignment was the one which could produce continuous and slowly declining force.

Dental Alloys ; Materials Testing ; Mechanics ; Nickel ; Orthodontic Wires ; Titanium

OBJECTIVETo investigate the differently expressed Homeobox genes between lingual squmaous cell carcinoma and normal mucosa.

METHODSSeven paired specimens including lingual squmaous cell carcinoma and its surrounding normal tissue were obtained from 7 patients. Customized Oligo microarray which contains numerous probes of 232 human Homeobox genes was used to analyse the results. All datas were scanned by Agilent scanner and differentiately expressed genes were sorted out.

RESULTSHomeobox gene NANOG was found up-regulated in 5 samples. PHTF2 was found down-regulated in 7 samples, and CRX, PITX1, OTEX was found down-regulated in 5 samples.

CONCLUSIONAs the key gene to cellular proliferation and differentiation, Homeobox genes is closely releverant to the oncogenesis of lingual squmaous cell carcinoma.

Cell Differentiation ; Gene Expression Regulation, Neoplastic ; Genes, Homeobox ; Humans ; Mucous Membrane

OBJECTIVETo explore the effects of anti-CD44 monoclonal antibody-IM7 on the in vitro adhesion and migration of chronic myeloid leukemia stem cell (CML-LSC) and its mechanism.

METHODSCD34(+)CD38(-)CD123(+) leukemic stem cells (LSC) from 20 newly-diagnosed chronic myeloid leukemia (CML) patients BM cells and CD34(+)CD38(-) hematopoietic stem cells (HSC) from 20 full-term newborn cord blood cells were isolated with EasySep(TM) magnet beads. The CD44 expression of the LSC and HSC was detected by flow cytometry (FCM), and the adhesion and migration ability of the LSC and HSC pre- and post-incubated with IM7 in vitro by MTT assay and transendothelial migration assay, respectively.

RESULTS(1) After incubated with IM7, the LSC and HSC CD44 expression rates were (86.60 ± 2.10)% vs. (25.40 ± 1.70)% (P < 0.05), respectively. (2) The adhesive ability of the LSC to endothelial cells was decreased markedly after incubated with IM7, the OD value (A(570)) changing from pre-incubation of (0.62 ± 0.11) to post-incubation of (0.34 ± 0.07), while there was little change of A(570) in the HSC group. (3) The migration ability of the LSC group was inhibited evidently after incubated with IM7, the inhibition rate being 46% ∼ 63%, while little change of that in HSC group was detected. (4) The adhesive ability of the LSC group to marrow stromal cells was decreased markedly after incubated with IM7, while little change was found in that of HSC group.

CONCLUSIONThe anti-CD44 monoclonal antibody-IM7 can effectively inhibit the adhesion and migration abilities of the LSC in vitro, which might provide a theoretical evidence for targeting therapy.

Antibodies, Monoclonal ; pharmacology ; Antigens, CD34 ; metabolism ; Bone Marrow ; drug effects ; Flow Cytometry ; Hematopoietic Stem Cells ; drug effects ; Humans ; Leukemia, Myelogenous, Chronic, BCR-ABL Positive ; metabolism

OBJECTIVETo isolate stem cells from human exfoliated deciduous teeth (SHEDs) and identify their phenotypes and multi-lineage differentiation potential.

METHODSHuman pulp tissue from exfoliated deciduous teeth were dissected and digested to obtain the single cell suspension. The SHEDs selected by magnetic activated cell sorting system (MACS) were identified by examination of the cell morphology and growth in vitro and detection of the expressions of the cell markers. Osteogenic and adipogenic induction was performed to test the multi-lineage differentiation potential of the cells.

RESULTSSHEDs were successfully isolated from human exfoliated deciduous teeth. SHEDs showed a lower growth rate than dental pulp cells and displayed high expressions of CD29 and CD105 but low expressions of CD34 and CD45 as shown by flow cytometry. Experiments of in vitro induction demonstrated a strong potential of the STRO-1+ SHEDs for osteogenic and adipogenic differentiation.

CONCLUSIONImmunomagnetic bead selection can be used to isolate and purify SHEDs, and the STRO-1+ SHEDs show the characteristics of stem cells with multipotent differentiation potentials.

Cell Separation ; Cells, Cultured ; Dental Pulp ; cytology ; Humans ; Immunomagnetic Separation ; methods ; Stem Cells ; cytology ; Tooth, Deciduous ; cytology