Plasmid-mediated azithromycin resistance in non-typhoidal Salmonella recovered from human infections.

OBJECTIVES: Mechanisms of non-typhoidal Salmonella (NTS) resistance to azithromycin have rarely been reported. Here we investigate the epidemiology and genetic features of 10 azithromycin-resistant NTS isolates. METHODS: A total of 457 NTS isolates were collected from a tertiary hospital in Guangzhou. We performed antimicrobial susceptibility tests, conjugation experiments, efflux pump expression tests, whole-genome sequencing and bioinformatics analysis to conduct the study. RESULTS: The results showed that 10 NTS isolates (2.8%) were resistant to azithromycin with minimum inhibitory concentration values ranging from 128 to 512 mg/L and exhibited multidrug resistance. The phylogenetic tree revealed that 5 S. London isolates (AR1-AR5) recognized at different times and departments were closely related [3-74 single-nucleotide polymorphisms (SNPs)] and 2 S. Typhimurium isolates (AR7 and AR8) were clones (<3 SNPs) at 3-month intervals. The azithromycin resistance was conferred by mph(A) gene found on different plasmids, including IncFIB, IncHI2, InFII, IncC and IncI plasmids. Among them, IncFIB, InFII and IncHI2 plasmids carried different IS26-class 1 integron (intI1) arrangement patterns that mediated multidrug resistance transmission. Conjugative IncC plasmid encoded resistance to ciprofloxacin, ceftriaxone and azithromycin. Furthermore, phylogenetic analysis demonstrated that mph(A)-positive plasmids closely related to 10 plasmids in this study were mainly discovered from NTS, Escherichia coli, Klebsiella pneumonia and Enterobacter hormaechei. The genetic environment of mph(A) in 10 NTS isolates was IS26-mph(A)-mrx(A)-mphR(A)-IS6100/IS26 that co-arranged with intI1 harbour multidrug-resistant (MDR) gene cassettes on diverse plasmids. CONCLUSIONS: These findings highlighted that the dissemination of these plasmids carrying mph(A) and various intI1 MDR gene cassettes would seriously restrict the availability of essential antimicrobial agents for treating NTS infections.

[Study of exogenous uniconazole on alleviating low-temperatuer stress of coix seedlings].

The aim of the study is to explore exogenous S3307 on alleviating low-temperature stress of coix seedlings. The coix cultivar, "No 5 Yiliao", was selected as the plant material, through nutrient solution cultivating in greenhouse, the effect of different S3307 concentrations(1, 3, 5, 7, 9 mg·L~(-1)) on coix seedlings traits and physiological indicators were explored under low-temperature stress. The results showed, under low-temperature 5 mg·L~(-1) S3307 could significantly increase coix seedlings stem diameter and biomass, which stem diameter and above-ground biomass, low-ground biomass separately were enhanced 11.90%, 13.59%, 10.99%. Leaf width and lateral root number separately were enhanced 7.63%, 37.52%. Meanwhile, addition of 5 mg·L~(-1) S3307 could significantly reduce relative conductivity and MDA, separately being reduced 23.33%, 17.42% compared to CKL. S3307 could also significantly increase soluble sugar and proline content, which leaf soluble sugar and proline content separately were enhanced 17.16%, 11.87%, which root soluble sugar and proline content separately were enhanced 20.00%, 33.42%. Additionally, S3307 could alleviate the cells destroy in ultra-structure level by improving cell membrane structure and chloroplast capsule layer structure. 5 mg·L~(-1) S3307 could enhance the low temperature tolerance of coix seedlings by regulating the growth and physiological indexes, and thus alleviate the damage caused by low-temperature to the coix seedlings.

Pilot study of genome-wide DNA methylation and gene expression for treatment response to escitalopram in panic disorder.

BACKGROUND: Antidepressants, particularly selective serotonin reuptake inhibitors, are currently considered the first-line treatment for panic disorder (PD). However, little is known about the relationship between the biomarkers that may predict better treatment. AIM: To compare genome-wide methylation and gene expression patterns between responsive and non-responsive patients with PD after 4 wk of escitalopram treatment. METHODS: Thirty patients with PD were enrolled in this study (responders = 13; non-responders = 17). All patients were assessed using the PD Severity Scale-Chinese version before and after treatment. The Illumina Infinium MethylationEPIC (850k) BeadChip for genome-wide methylation screening and mRNA sequencing was used in all patients with PD. RESULTS: A total of 701 differentially methylated positions (DMPs) were found between responders and non-responders (|Δß| ≥ 0.06, q < 0.05), and the hyper- and hypomethylated CpG sites were 511 (72.9%) and 190 (27.1%), respectively. Relative to non-responders, there were 59 differential transcripts, of which 20 were downregulated and 39 were upregulated (q < 0.05). However, no differentially expressed genes were identified by mRNA sequencing after correcting for multiple testing (|log2(FC)| > 1, q > 0.05). CONCLUSION: This preliminary study showed that DMPs might be associated with the treatment response to escitalopram in PD; however, these DMPs need to be verified in large samples.

Glutamate decarboxylase 1 gene polymorphisms are associated with respiratory symptoms in panic disorder.

BACKGROUND: Genetic factors play an important role in the pathogenesis of panic disorder (PD). However, the effect of genetic variants on PD remains controversial. AIM: To evaluate the associations between glutamate decarboxylase 1 (GAD1) gene polymorphisms and PD risk and assess the effect of GAD1 gene polymorphisms on the severity of clinical symptoms in PD. METHODS: We recruited 230 PD patients and 224 healthy controls in this study. All participants were assessed for anxiety and panic symptom severity using the Hamilton Anxiety Rating Scale (HAM-A) and Panic Disorder Severity Scale (PDSS). GAD1 gene polymorphisms (rs1978340 and rs3749034) were genotyped and assessed for allele frequencies. RESULTS: There were no significant differences between cases and controls in the genotype distributions or allele frequencies of GAD1 (rs1978340 and rs3749034). In addition, the effect of GAD1 (rs1978340 and rs3749034) on PD severity was not significant. However, regarding respiratory symptoms, patients with the GAD1 rs1978340 A/A genotype had significantly higher scores than those with the A/G or G/G genotype. CONCLUSION: Here, we showed that the A/A genotype of GAD1 rs1978340 was associated with increased severity of respiratory symptoms in patients with PD.

[Literature survey on botanical origin and clinical application of traditional Tibetan medicine "Shengdeng"].

"Shengdeng" is its Tibetan transliteration referring to many medicines. Tibetan doctors and pharmacists in different areas use different drugs in formulation and clinical application, which are easily confused. In order to grasp the formula and clinical application accurately, we conduct a literature survey on history and current state of botanical origin and clinical application of "Shengdeng", making clear the application of various herbs named "Shengdeng" and providing reference to all Tibetan researchers and clinical workers in formulation and clinical application.

Knockdown of Peroxiredoxin V increased the cytotoxicity of non-thermal plasma-treated culture medium to A549 cells.

Administration of non-thermal plasma therapy via the use of plasma-activated medium (PAM) might be a novel strategy for cancer treatment, as it induces apoptosis by increasing reactive oxygen species (ROS) levels. Peroxiredoxin V (PRDX5) scavenges ROS and reactive nitrogen species and is known to regulate several physiological and pathological reactions. However, its role in lung cancer cells exposed to PAM is unknown. Here, we investigated the effect of PRDX5 in PAM-treated A549 lung cancer cells and determined the mechanism underlying its cytotoxicity. Cell culture medium was treated with low temperature plasma at 16.4 kV for 0, 60, 120, or 180 s to develop PAM. PRDX5 was knocked down in A549 cells via transfection with short hairpin RNA targeting PRDX5. Colony formation and wound healing assays, flow cytometry, fluorescence microscopy, and western blotting were performed to detect the effect of PRDX5 knockdown on PAM-treated A549 cells. PAM showed higher cytotoxicity in lung cancer cells than in control cells, downregulated the mitogen-activated protein kinase signaling pathway, and induced apoptosis. PRDX5 knockdown significantly inhibited cell colony formation and migration, increased ROS accumulation, and reduced mitochondrial membrane potential in lung cancer cells. Hence, PRDX5 knockdown combined with PAM treatment represents an effective option for lung cancer treatment.

Sequelae of iatrogenic periodontal destruction associated with elastics and permanent incisors: literature review and report of 3 cases.

The purpose of this paper was to report 3 cases of localized aggressive periodontal bone destruction related to improper use of orthodontic elastic bands to close diastemas in permanent anterior teeth and to compare the results to previous studies. Some common signs and symptoms of this particular destruction were observed with these patients that had been previously reported when the comparisons of these cases were made. The patients usually experienced a painful sensation, and an isolated pyogenic-like granuloma appeared at the interdental area. Radiographs revealed localized periodontal destruction, with tooth extrusion and clinical crown divergence and radiographic root convergence; the two involved teeth moved simultaneously during mobility testing. Surgical intervention and treatment of the cases was described. The prognosis is usually decided by the severity of the condition, and many factors may influence the healing of treated cases.

Mahonia vs. Berberis Unloaded: Generic Delimitation and Infrafamilial Classification of Berberidaceae Based on Plastid Phylogenomics.

The early-diverging eudicot family Berberidaceae is composed of a morphologically diverse assemblage of disjunctly distributed genera long praised for their great horticultural and medicinal values. However, despite century-long studies, generic delimitation of Berberidaceae remains controversial and its tribal classification has never been formally proposed under a rigorous phylogenetic context. Currently, the number of accepted genera in Berberidaceae ranges consecutively from 13 to 19, depending on whether to define Berberis, Jeffersonia, and Podophyllum broadly, or to segregate these three genera further and recognize Alloberberis, Mahonia, and Moranothamnus, Plagiorhegma, and Dysosma, Diphylleia, and Sinopodophyllum, respectively. To resolve Berberidaceae's taxonomic disputes, we newly assembled 23 plastomes and, together with 85 plastomes from the GenBank, completed the generic sampling of the family. With 4 problematic and 14 redundant plastome sequences excluded, robust phylogenomic relationships were reconstructed based on 93 plastomes representing all 19 genera of Berberidaceae and three outgroups. Maximum likelihood phylogenomic relationships corroborated with divergence time estimation support the recognition of three subfamilies Berberidoideae, Nandinoideae, and Podophylloideae, with tribes Berberideae and Ranzanieae, Leonticeae and Nandineae, and Podophylleae, Achlydeae, Bongardieae tr. nov., Epimedieae, and Jeffersonieae tr. nov. in the former three subfamilies, respectively. By applying specifically stated criteria, our phylogenomic data also support the classification of 19 genera, recognizing Alloberberis, Mahonia, and Moranothamnus, Plagiorhegma, and Diphylleia, Dysosma, and Sinopodophyllum that are morphologically and evolutionarily distinct from Berberis, Jeffersonia, and Podophyllum, respectively. Comparison of plastome structures across Berberidaceae confirms inverted repeat expansion in the tribe Berberideae and reveals substantial length variation in accD gene caused by repeated sequences in Berberidoideae. Comparison of plastome tree with previous studies and nuclear ribosomal DNA (nrDNA) phylogeny also reveals considerable conflicts at different phylogenetic levels, suggesting that incomplete lineage sorting and/or hybridization had occurred throughout the evolutionary history of Berberidaceae and that Alloberberis and Moranothamnus could have resulted from reciprocal hybridization between Berberis and Mahonia in ancient times prior to the radiations of the latter two genera.

The Effect of Positive Emotion and Interpersonal Relationships to Adaptation of School Life on High School Athletic Class Students.

BACKGROUND: Adaption for school life is important for all students. As for athletic students, since they need to cope with schoolwork and extensive training, adaption for school life could be very challenging. Taking this into consideration, the purpose of this study was to explore the factors which may help high school athletic students' adaption of school life. Owing to this, the study explored previous researches and proposed four hypotheses: the first two hypotheses proposed that athletes' positive emotion will have positive impacts on both their interpersonal relationships and adaption of school life; the third hypothesis suggests that athletes' interpersonal relationships will have positive impacts on their adaption of school life and the fourth hypothesis suggested that interpersonal relationships play a mediating role among the positive emotion's effect on adaption of school life. METHODS: A total of 800 structured questionnaires were distributed to eleven high schools with athletic class students for data collection with a valid return rate of 90.6%. Structural equation modelling was used to test the relationship among them. RESULTS: The result showed that positive emotion (ß = 0.72, p < 0.05) and interpersonal relationships (ß = 0.34, p < 0.05) had positive impacts on students' adaption of school life with a predictive power of 68%. In addition, positive emotion also affected students' school life adaption through interpersonal relationships. CONCLUSION: The study confirmed the positive emotion can have significant influences on student athletes' interpersonal relationships and school life adaption. IMPLICATIONS: According to our findings, we suggest to encourage and promote athletes' positive emotions so to help them have better interpersonal relationships and school life adaption.

Bacterial tracheitis in pediatrics: 12 year experience at a medical center in Taiwan.

BACKGROUND: Bacterial tracheitis may cause life-threatening airway obstruction. METHODS: Records of patients admitted to the pediatric wards of Mackay Memorial Hospital between 1994 and 2005 with a diagnosis of bacterial tracheitis made on bronchoscopic visualization of thick membranous tracheal secretions were retrospectively reviewed. RESULTS: A total of 40 patients (aged 1 month-8 years, 29 [73%] under 3 years old) were included. Cough, fever, dyspnea, and hoarseness were the commonest symptoms. Fourteen patients (21%) required intubation. The most frequently isolated bacteriae were alpha-hemolytic streptococcus (in 11, 38%), pseudomonas (5, 17%), and Staphylococcus aureus (4, 14%). Intubation was more frequent in patients seen between 1994 and 1999 compared with those seen later (8/12 early vs 9/28 late). In the early period alpha-hemolytic streptococcus (55%) and pseudomonas (36%) were isolated. In the later period the most frequently isolated bacteria was alpha-hemolytic streptococcus (28%), followed by S. aureus (22%). No patients died, but those with pseudomonas infection had more severe complications, including tracheal stenosis. The average hospital stay in the early period was 26.2 +/- 20.5 days versus 9.1 +/- 4.8 days in the late period. The corresponding lengths of stay in the intensive care unit were 10.5 +/- 11.5 days and 2.0 +/- 2.2 days. CONCLUSIONS: Bacterial tracheitis requiring hospitalization of children appeared to be milder in the second half of the study period. Pseudomonas tracheitis tends to have a severe course.

[The relationship between the aquaporin-4 and brain edema, pathologic change, ultrastructure in peri-hematoma tissue in patients with intracerebral hemorrhage].

OBJECTIVE: To observe the expression of aquaporin-4 (AQP-4) mRNA and study the relationship between AQP-4, brain edema, pathological changes and ultrastructure of peri-hematoma tissue in intracerebral hemorrhage (ICH) patients. METHODS: Intracranial operation was performed via nonfunctional area with a funnel-like approach on 30 ICH patients. The brain tissue which must be removed 1 cm away the hematoma was removed within 12 hours for observation as normal brain tissue and taken as the control group (7 patients), and which of the brain tissue within 1 cm around hematoma was taken as the study specimens. The experimental group was subdivided into five groups according to the time interval after ICH: <6 hours (6 cases), 6-12 hours (7 cases), 12-24 hours (5 cases), 24-72 hours (6 cases), and >72 hours ( 6 cases ). Expression of the AQP-4 mRNA, brain edema, pathological and ultrastructural changes were observed with reverse transcription-polymerase chain reaction (RT-PCR), light microscope and electron microscope. RESULTS: The expression of the AQP-4 mRNA was not remarkable, the morphology and construction were basically normal in control group. The expression of AQP-4 mRNA was mild (1.17+/-0.41)and there was edema of neuroglia in the <6 hours group. After 6 hours, besides neuroglial edema, the expression of the AQP-4 mRNA was gradually obvious, capillary endothelial cells began to swell too, and tight junctions gradually began to loosen. In the 12-72 hours group the expression of the AQP-4 mRNA reached its peak (3.50+/-0.55, 3.60+/-0.55, both P<0.01), and brain edema was most prominent, and electron microscopy showed that neurons, neuroglia, and capillary endothelial cells were markedly deformed. After 72 hours, the expression of AQP-4 mRNA gradually recovered, and brain cells showed less damage. On the 5th day the damage began to repair, and on the 8th day, the damage was basically repaired. The correlation analysis showed that there was a remarkable positive correlation between the expression of the AQP-4 mRNA and the degree of brain edema and the size of hematoma (r(1)=0.67, P<0.01; r(2)=0.44, P<0.05) . CONCLUSION: Secondary edema and brain damage may correlate with the expression of the AQP-4 mRNA in the peri-hematoma brain edema area. Removal of hematoma will help decrease the AQP-4 mRNA expression and brain edema damage in the early stage.

[Clinical Significance of Detecting Tissue Factor and Tissue Factor Pathway Inhibitor in Thalassemia Patients].

OBJECTIVE: To investigate the changes of E-selectin, thrombin-antithrombin complex（TAT）, prothrombin fragment 1+2（F1+2）, tissue factor（TF）and tissue factor pathway inhibitor（TFPI）before and one year after splenectomy in thalassemia patients. METHODS: A total of 30 thalassemia patients undergoing electric laparoscopic splenectomy and 30 normal controls（NC） were enrolled in the study．Plasma levels of E-selectin, TAT, F1+2, TF and TFPI were detected by enzyme-linked immuno sorbent assay（ELISA）. RESULTS: One year after splenectomy，the plasma concentrations of E-selectin, TAT, F1+2, TF, TFPI were significantly higher than those in both preoperative and NC groups．Levels of E-selectin, TAT, F1+2 before splenectomy were significantly higher than those in NC groups. In addition, there was a positive correlation between plasma TF and TFPI level before and after splenectomy, and the levels of TF and TFPI positively correlated with TAT and F1+2, respectively. CONCLUSION: After splenectomy, the platelet count increases, the activity of endothelial cells is injured, the procoagulant factor increases, the blood is in procoagulant state, the TF/TFPI shows an importent role in the thrombosis of thalassemia patieints after splenectomy and may be used to evaluate the prothrombotic state of this diasease.

[Study of relationship between inflammatory response and apoptosis in perihematoma region in patients with intracerebral hemorrhage].

OBJECTIVE: To investigate the relationship between inflammatory response and cell apoptosis in the perihematoma region in patients with intracerebral hemorrhage (ICH). METHODS: Surgical specimens were obtained from the area 1 cm adjacent to the hematoma. Thirty patients with ICH were divided into five groups: 6, 7, 5, 6, 6 patients in surgery<6 hours, 6-12 hours, 12-24 hours, 24-72 hours and >72 hours groups after the onset, respectively. The control group specimens were obtained from the brain tissues distant to the hematoma in the process of craniotomy in the patients of two former groups. Sections were stained with hematoxylin and eosin (HE) for the examination of pathological changes. Immunohistochemistry, terminal deoxynucleotidyl transferase mediated dUTP biotin nick end labeling (TUNEL) and reverse transcription-polymerase chain reaction (RT-PCR) were applied to determine apoptosis cells, Bax and Bcl-x protein and mRNA. RESULTS: The tissues from perihematoma region were almost normal in control group and <6 hours group. They were slightly damaged in 6-12 hours group, became worse in 12-24 hours group and most severe in 24-48 hours group, and they became better latter and were similar to the control group on 8th day. Infiltration of neutrophils, macrophages and lymphocyte appeared gradually at 6-12 hours, and became much more prominent at 12-24 hours (all P<0.01). The reactive gliosis began to appear at 24-72 hours, and enhanced after 72 hours (all P<0.01). The expression of the apoptosis and Bax protein increased gradually after 6 hours, reaching the peak at 12-24 hours (P<0.05 or P<0.01), and decreased gradually later. The changes in the levels of Bax mRNA were similar to that of the result of immunohistochemistry. Although the expression of Bcl-x protein and mRNA seemed to be increased at 12-72 hours, there was no significant difference between groups (P>0.05). The correlation analysis showed that the infiltration of neutrophils, macrophages and lymphocyte was positively correlated to the TUNEL positive cells and expression of Bax protein and mRNA (P<0.05 or P<0.01), and showed no correlation to Bcl-x protein and mRNA (all >0.05). CONCLUSION: There is a close relationship between inflammatory response and apoptosis and tissue damage in the perihematoma area in ICH.

Manganese Toxicity in Sugarcane Plantlets Grown on Acidic Soils of Southern China.

Ratoon sugarcane plantlets in southern China have suffered a serious chlorosis problem in recent years. To reveal the causes of chlorosis, plant nutrition in chlorotic sugarcane plantlets and the role of manganese (Mn) in this condition were investigated. The study results showed that the pH of soils growing chlorotic plantlets ranged from 3.74 to 4.84. The symptoms of chlorosis were similar to those of iron (Fe) deficiency while the chlorotic and non-chlorotic plantlets contained similar amount of Fe. Chlorotic plantlets had 6.4-times more Mn in their leaf tissues compared to the control plants. There was a significantly positive correlation between Mn concentration in the leaves and the exchangeable Mn concentration in the soils. Moreover, leaf Mn concentration was related to both seasonal changes in leaf chlorophyll concentration and to the occurrence of chlorosis. Basal stalks of mature sugarcanes contained up to 564.36 mg·kg(-1) DW Mn. Excess Mn in the parent stalks resulted in a depress of chlorophyll concentration in the leaves of sugarcanes as indicated by lower chlorophyll concentration in the leaves of plantlets emerged from basal stalks. Ratoon sugarcane plantlets were susceptible to chlorosis due to high Mn accumulation in their leaves (456.90-1626.95 mg·kg(-1) DW), while in planted canes chlorosis did not occur because of low Mn accumulation (94.64-313.41mg·kg(-1) DW). On the other hand, active Fe content in chlorotic plantlets (3.39 mg kg(-1) FW) was only equivalent to 28.2% of the concentration found in the control. These results indicate that chlorosis in ratoon sugarcane plantlets results from excessive Mn accumulated in parent stalks of planted cane sugarcanes grown on excessive Mn acidic soils, while active Fe deficiency in plantlets may play a secondary role in the chlorosis.

Sonogram before and after pyloromyotomy: the pyloric ratio in infantile hypertrophic pyloric stenosis.

BACKGROUND: Sonography is used to diagnose infantile hypertrophic pyloric stenosis, but Little information is available about the appearance of postoperative sonographs. The purpose of this study was to evaluate the morphology of the pylorus in association with an obstruction before and after pyloromyotomy. METHODS: Pyloric length, diameter, muscle thickness and intermuscular space were measured sonographically at diagnosis and daily after pyloromyotomy until discharge in 12 infants with infantile hypertrophic pyloric stenosis. The ratios of pyloric wall thickness and intermuscular space to the entire pyloric diameter were measured. RESULTS: The pylorus still appeared hypertrophied after pyloromyotomy on the sonograms. The traditional measurement of linear dimensions of the pylorus was not significantly changed from the preoperative values by the time of discharge, except for muscle thickness. The intermuscular space increased from 4.8+/-0.8 mm preoperatively to 7.3+/-2.1 mm by postoperative day 3 (p=0.10). Lowe's pyloric ratio at diagnosis was a mean of 0.32, decreasing to 0.29 on postoperative day 3 and 0.29 on the day of discharge (p=0.82). The alternative pyloric ratio increased significantly by postoperative day 2 (0.24+/-0.09 on day 2 vs. 0.11+/-0.07 preoperatively, p=0.02). CONCLUSION: The pyloric ratio appears to be a reliable parameter in evaluating the regression of pyloric stenosis after pyloromyotomy, and also aids in the diagnosis of pyloric stenosis.