hOGG1: A novel mediator in nitrosamine-induced esophageal tumorigenesis

BACKGROUND

The effect of human 8-Oxoguanine DNA Glycosylase (hOGG1) on exogenous chemicals in esophageal squamous cell carcinoma (ESCC) remain unclear. The study plans to determine hOGG1 expression levels in ESCC and possible interactions with known environmental risk factors in ESCC.

MATERIAL AND METHODS

We analyzed levels of exposure to urinary nitrosamines in volunteers from high and low prevalence areas by GC-MS. And we performed the interaction between hOGG1 gene and nitrosamine disinfection by-products by analyzing hOGG1 gene expression in esophageal tissues.

RESULTS

In ESCC, nitrosamine levels were significantly increased and hOGG1 mRNA expression levels were significantly decreased. There was a statistically significant interaction between reduced hOGG1 mRNA levels and non-tap drinking water sources in ESCC. The apparent indirect association between ESCC and NMEA indicated that 33.4% of the association between ESCC and NMEA was mediated by hOGG1.

CONCLUSION

In populations which exposed to high levels of environmental pollutants NDMA, low expression of hOGG1 may promote the high incidence of esophageal cancer in Huai'an. hOGG1 may be a novel mediator in nitrosamine-induced esophageal tumorigenesis.

Ligature-Induced Periodontitis Drives Colorectal Cancer: An Experimental Model in Mice

Periodontitis is a prevalent inflammatory oral disease associated with an increased risk of colorectal cancer. Experimental animal models are critical tools to investigate the effects and mechanisms of periodontitis on colorectal cancer. Several murine periodontitis models have been used in research, including oral gavage, periodontal pathogen injection, and ligature models. The role of experimental periodontitis caused by silk ligation in colorectal cancer remains unclear. In this study, we used an experimental periodontitis model on a colitis-associated colorectal cancer model and a spontaneous model, respectively. We observed the promotion of colorectal cancer in ligature-induced periodontitis mice compared to those control mice in 2 different models, as assessed by tumor number, tumor size, and tumor load. Since bacterial dysbiosis is an important feature of periodontitis, we next analyzed the oral and gut microbiomes using 16S ribosomal RNA gene sequencing. We found that the experimental periodontitis model reshaped the microbial community in the oral cavity and gut. In addition, we found a higher extent of programmed death 1 (PD-1)-positive CD8⁺ T-cell infiltration in tumor samples of the periodontitis group than in controls by immunofluorescence staining. Regarding the potential molecular mechanism, we transplanted the fecal microbiota of the periodontitis patient into mice and observed a tumor-promoting effect in the periodontitis group, assessed by tumor volume and tumor weight, together with a low level of INF-γ⁺ CD8⁺ T-cell infiltration in subcutaneous tumor mice. Taken together, we show that ligature-induced periodontitis model promotes colorectal cancer by microbiota remodeling and suppression of the immune response.

[Characteristics of serum autoantibodies in patients with lupus nephritis and tubulointerstitial damage]

OBJECTIVE

To observe the tubulointerstitial damage (TID) in lupus nephritis (LN) and investigate the relationship between autoantibodies and TID in lupus nephritis.

METHODS

This cross-sectional study was conducted in a comprehensive tertiary hospital in Peking University Shenzhen Hospital. From March 2012 to July 2021, LN patients who performed renal biopsy were enrolled in the study. Clinical, laboratory and pathology data were collected. We classified the patients into none-or-mild group and moderate-to-severe groups according to the severity of interstitial fibrosis (IF) /tubular atrophy (TA) or tubulointerstitial inflammation (TII). The t test, U test and Chi-square test were used for statistical analysis as appropriate.

RESULTS

A total of 226 patients were included, of who 190 (84%) were female with a median age of 32 (26, 39) years. 89% (201/226) of the patients who pathologically proved to be proliferative LN by renal biopsy. The frequency of moderate-to-severe TII and moderate-to-severe IF/TA was 30% (67/226) and 34% (76/226) respectively. For autoantibodies, the patients with moderate-to-severe TII had a lower rate of positive serum anti-ribonucleoprotein (anti-RNP) antibodies than the patients with none-or-mild TII (34% vs. 51%), and moderate-to-severe IF/TA had a lower rate of positive anti-ribosomal P protein (anti-P) antibodies than patients with none-or-mild IF/TA (19% vs. 33%). For other clinical indicators, the patients with moderate-to-severe TII and moderate-to-severe IF/TA were more often combined with proliferative LN, hypertension and anemia than the patients with none-or-mild TII and none-or-mild IF/TA, respectively. The patients with moderate-to-severe TII had higher serum creatinine values and lower glomerular filtration rates than the patients with none-or-mild TII. The patients with moderate-to-severe IF/TA had higher serum creatinine values, and lower glomerular filtration rates than the patients with none-or-mild IF/TA.

CONCLUSION

In patients with LN in Southern China, anti-RNP antibodies and anti-P antibodies may be potential protective factors for TII and IF/TA, respectively. More studies are needed to identify the risk factors of lupus patients with TID and investigate the correlation between autoantibodies and TID, which are critical for developing better preventive and therapeutic strategies to improve the survival rate of LN.

[Expert consensus on diagnosis and treatment of latent tuberculosis infection in patients with rheumatic diseases]

Rheumatic diseases, a typical kind of autoimmune disease, are often treated with glucocorticoids, immunosuppressants, biological agents, and small-molecule targeted drugs, which often leads to immune dysfunction in patients and increases the risk of activation of latent tuberculosis infection. To regulate the screening, diagnosis, and prophylactic treatment of latent tuberculosis infection in patients with rheumatic diseases, reduce the risk of developing active tuberculosis and improve the prognosis, Peking University Shenzhen Hospital, Shenzhen Third People's Hospital and Peking Union Medical College Hospital jointly organized domestic experts in the field of rheumatology and tuberculosis to establish the expert consensus on the diagnosis and treatment of latent tuberculosis infection in patients with rheumatic diseases. This consensus focuses on epidemiology, the importance of screening, screening methods, and prophylactic anti-tuberculosis treatment strategies for latent tuberculosis infection combined with rheumatic diseases.

[Analysis of video-urodynamic and clinical features of non-neuropathic lower urinary tract dysfunction in children]

Objective: To analyze the video-urodynamic(VUDS) and clinical features of non-neuropathic lower urinary tract dysfunction (NNLUTD) in children. Methods: Children diagnosed with NNLUTD in the First Affiliated Hospital of Zhengzhou University from January 2016 to December 2020 were included. Children with neurological, rectal dysfunction and anatomical abnormalities were excluded. VUDS and urinalysis were performed in all children who were divided into 4 groups accordingly: normal group (Normal group), detrusor overactivity group(DO group), detrusor sphincter dyssynergia group (DSD group) and detrusor underactivity group (DU group). VUDS and clinical features, vesicoureteral reflux (VUR) and urinary tract infections (UTI) were analyzed. Results: A total of 173 children were included in this study, including 103 males and 70 females, aged (7.2±3.3) years. VUDS showed that 46 cases (26.6%) were in Normal group, 63 cases (36.4%) in DO group, 39 cases (22.5%) in DSD group and 25 cases (14.5%) in DU group. Compared with Normal group and DO group, the proportion of VUR in DSD group and DU group was significantly higher [18(46.2%) and 11(44.0%) vs 7(15.0%) and 14(22.2%), all P<0.05],and the proportion of male children was significantly higher than that of female children with VUR only in DO group [12(32.4%) vs 2(7.7%), P=0.020 ]; Compared with DO group, the proportion of UTI in DSD group and DU group was significantly higher [16(41.0%) and 12(48.0%) vs 12(19.0%), all P<0.05], and the proportion of female children was significantly higher than that of male children with UTI in normal group, DO group and DU group [9(45.0%) vs 4(15.4%), 8(30.8%) vs 4(10.8%)and 7(87.5%) vs 5(29.4%), all P<0.05]. The maximum detrusor pressure in DSD group was significantly higher than that in Normal group, DO group and DU group [(95±47) vs (43±18), (56±18) and (12±9)cmH₂O, all P<0.05, 1 cmH₂O=0.098 kPa).Compared with Normal group and DO group, post void residual in DSD group and DU group was significantly increased [(58±38) and (70±62) vs (8±8) and (8±7)ml, all P<0.05], and the proportion of lower bladder compliance was significantly increased [(15(38.5%) and 11(44%) vs 1(2.2%) and 10(15.9%), all P<0.05]. Compared with normal group, the maximum bladder capacity of DO, DSD and DU group were all significantly decreased [(178±61), (184±81) and (194±93) vs (256±92)ml, all P<0.05]. The proportion of urgency had significant difference in the four groups [13(28.3%) in Normal group, 41(65.1%) in DO group, 22(56.4%) in DSD group and 11(44.0%) in DU group, P=0.001], and the proportion of dysuria had significant difference too [5(10.9%) in Normal group, 18(28.6%) in DO group, 20(51.3%) in DSD group and 15(60.0%) in DU group, P<0.001]. Conclusions: Children with 4 different conditions of NNLUTD have distinct video-urodynamic features. The higher ratio of VUR and UTI in DSD and DU children may be associated with reduced bladder compliance and increased post void residual. VUDS is useful for the diagnosis and treatment of refractory children with NNLUTD.

[Evaluation of bladder function and sleep patterns in children with primary mono-symptomatic nocturnal enuresis by polysomnography combined with ambulatory urodynamic monitoring]

Objective: To evaluate the bladder function and sleep pattern in the children with primary mono-symptomatic nocturnal enuresis (PMNE) by the polysomnography (PSG) and ambulatory urodynamic monitoring (AUM). Methods: From October 2019 to October 2021, forty-three patients with PMNE were selected as PMNE group from the First Affiliated Hospital of Zhengzhou University and further subdivided into the severe PMNE group (enuresis>4 times/week) and the non-severe PMNE group (enuresis times 4 times/week) according to the severity. The conventional urodynamics (CUD), AUM, and PSG examinations and bladder diary were completed in the PMNE group. The control group consisted of 23 children with normal PSG findings and without the lower urinary tract symptoms. Results: The severe PMNE group included 9 males and 14 females, aged(12.1±3.2)years, and nocturnal enuresis number per week is 6.7±1.7. The non-severe PMNE group included 9 males and 11 females, aged(12.0±3.4)years, and nocturnal enuresis number per week is 2.3±1.0. The incidences of nocturnal polyuria and the reduction in maximum bladder capacity in the PMNE group was 34.9% and 11.6%, respectively. The incidence and frequency of detrusor overactivity (DO) in the severe PMNE group were significantly higher than those in the non-severe PMNE group [78.3% vs 45.0%, (5.5±1.8) times/h vs (3.4±1.0) times/h, respectively, all P<0.05]. It was found by the PSG that the severe PMNE group had significantly higher cortical arousal index, apnea hypopnea index (AHI), and percentage of N1+N2 phase in total sleep time, compared with the control group[(58.6±9.8)% vs (49.3±9.5)%, (9.4±4.4) times/h vs (3.1±1.5) times/h, (2.7±0.9) times/h vs (0.9±0.7) times/h] (all P<0.05). While the sleep efficiency of the severe PMNE group was substantially lower than that of the non-severe PMNE group [(86.4±4.3)% vs (91.0±3.9)%], the cortical arousal index and AHI were significantly greater than those of the non-severe PMNE group[(9.4±4.4) times/h vs (5.7±3.2) times/h, (2.7±0.9) times/h vs (1.9±0.7) times/h] (all P<0.05). In the PMNE group, there were positive correlations between cortical arousal index and nocturnal DO frequency or AHI (r=0.705, 0.765, P=0.001). Conclusions: Children with PMNE have nocturnal bladder dysfunction and abnormal sleep pattern, and there is a certain correlation between them. PSG and AUM are necessary for the evaluation and treatment of children with PMNE.

Treatment with activin type ii receptor antibody improves cardiac function in mice after myocardial infarction

Background

Activin type ii receptor (ActRII) binding to its natural ligands including myostatin, activin, and growth development factor 11 negatively regulates muscle growth. Blockade of the ligands/ActRII signaling with human ActRII monoclonal antibody has been shown to increase body lean mass and reduce fat mass in patients with type 2 diabetes. However, the blockade effect on the ligands/ActRII signaling in heart failure with or without cardiac cachexia remains controversial. We hypothesized that the blockade effect on the ligands/ActRII signaling with a murine ActRII monoclonal antibody would improve cardiac function in a mouse model of heart failure.

Methods

Under anesthesia with isoflurane in oxygen, C57BL/6 mice were subjected to sham surgery or myocardial infarction (MI) by ligation of left anterior descending coronary artery to induce heart failure. Mice were randomized into treatment groups based on ejection fraction measured by Vevo 3100 Imaging System two weeks after MI. MI mice were treated weekly with vehicle (n=11), 10 mg/kg (n=12), or 20 mg/kg (n=12) ActRII antibody by subcutaneous injection for 8 weeks. Cardiac function was determined by Vevo 3100 Imaging system at 4, 8 weeks post-treatment, respectively. Body lean and fat mass were determined by Bruker's Whole Body Composition Analyzer. Myocardial infarct size was determined by Masson's trichrome staining on heart sections.

Results

Myocardial infarction markedly impaired cardiac function in mice. Ejection fraction reduced to 21.3±1.9% in MI mice compared to 56.3±1.2% in sham-operated mice (p&lt;0.0001). Weekly treatment with 10 mg/kg or 20 mg/kg antibody significantly improved ejection fraction to 32.1±2.8%, and 35.9±2.9%, respectively (p&lt;0.01 and p&lt;0.001). Antibody treatment in MI mice also reduced MI-induced lung congestion by 5% and 8% (p&lt;0.01), respectively. However, heart weight and myocardial infarct size in antibody treated mice were comparable to those in vehicle-treated mice. Moreover, antibody treatment dose-dependently increased body weight, which is further confirmed by increases in muscle mass and body lean mass measured by gravimetric analysis and body composition analyzer.

Conclusion

ActRII antibody dose-dependently improved cardiac function independent of myocardial infarct size post-MI. Although antibody significantly increased body weight and lean mass, it did not significantly increase heart weight, indicating that antibody treatment did not cause adverse remodeling post-MI while it remarkably improved cardiac function. Our data suggest that ActRII antibody could be a novel treatment for heart failure with reduced ejection fraction and may be particularly beneficial in patients with cachexia.

Funding Acknowledgement

Type of funding sources: None.

[Evaluation of the efficacy of a new variable frequency stimulation sacral neuromodulation in the treatment of detrusor hyperactivity with impaired contractility]

A total of 16 detrusor hyperactivity with impaired contractility (DHIC) patients who received 12 weeks remote variable frequency stimulation (VFS) were enrolled at the First Affiliated Hospital of Zhengzhou University from September 2020 to February 2021. The voiding diary, symptom score scales and incidence of complications were completed and recorded at baseline, constant frequency stimulation (CFS) and VFS phases. Compared with the CFS phase, voiding times, urge incontinence times and daily catheterization volume were reduced; average voiding amount and functional bladder capacity increased; and the quality of life score and mental health questionnaire assessment were improved in the VFS phase(all P<0.05). In the end, among all 16 patients, there were 14 whose symptoms had improved, and there were no new complications such as pain or infection at the implantation site, electrode displacement, and electric shock sensation in the stimulation area. VFS-SNM can not only improve the DHIC patients' lower urinary tract symptoms during storage and urination period, but also improve the patients' quality of life and satisfaction of the therapy.

Diversity of Botryosphaeriaceae Species Associated with Chinese Hickory Tree (Carya cathayensis) Trunk Cankers

Tree trunk cankers represent serious fungal diseases that pose significant threats to Chinese hickory trees (Carya cathayensis). To characterize the pathogen diversity associated with this disease, tissues were collected between 2016 and 2018 from the primary Chinese hickory plantation regions. A total of 97 cultures were isolated from trees in six towns (Longgang, Qingliangfeng, Changhua, Tuankou, Taiyang Town, and Lin'an urban area) within the Linan district, where 60% of Chinese hickory tree yields originate. The isolated cultures caused cankers on Chinese hickory tree branches, but infections did not occur on fruits or leaves under tested conditions. Combined morphological observations and phylogenetic analysis of multiple genes (ITS, β-tubulin, and EF) indicated that five Botryosphaeriaceae species were recovered, including 89 isolates of Botryosphaeria dothidea, 4 isolates of Botryosphaeriaceae fabicerciana, 1 isolate of Botryosphaeriaceae qingyuanensis, 1 isolate of Botryosphaeriaceae corticis, and two isolates of Lasiodiplodia theobromae. B. dothidea was the most prevalent, and this is the first report of B. corticis, B. qingyuanensis, and L. theobromae infections in Chinese hickory trees. We investigated the mycelial growth, spore germination, and pathogenicity of these species at different temperatures. L. theobromae grew the fastest and B. cortices grew the slowest on potato dextrose agar. The optimum temperature of spore germination for all species was 30°C. L. theobromae was the most virulent species, followed by B. dothidea and B. qingyuanensis, then B. fabicerciana, and finally B. cortices. These new insights into fungal pathogen diversity provide critical new information to understand and manage tree trunk cankers of Chinese hickory.

[Genetic characteristics of hantavirus from rodents in port area of Ningde , Fujian province in the summer of 2020]

Objective: To explore the genetic characteristics and evolution of hantavirus carried by rodents in port area of Ningde in Fujian province in the summer of 2020. Methods: Rodents were captured in the port area of Ningde, the RNA was extracted from rodent lung tissues and detected by using specific kit. The positive samples were used for whole-genome sequencing of the virus. Bioinformatics software was used for the analysis on the similarity and genetic variation of the sequences. Results: A total of 112 rodents were captured, including 5 Rattus norvegicus and 2 Rattus flavipectus, the positive rate of hantavirus was 6.25% (7/112). By virus gene sequencing, two hantavirus complete genome sequences were obtained (named as FJ35 and FJ36, GenBank accession numbers: MW449188-MW449193). The genetic analysis results showed that the hantavirus detected in positive samples were SEOV and shared 99% nucleotide similarity with hantavirus strains LZSF21 and JX20140581 isolated from Shandong province. Phylogenetic analysis using the maximum likelihood method showed that the hantavirus detected in positive samples belonged to S3 subtype, sharing the same subtype with hantavirus strains Z37 from Zhejiang province, LZSF21 from Shandong province, and zy27 and Gongzhuling 415 from northeastern China. Compared with FJ372, the amino acid variation of N259S was observed at sites 251-264 of nucleoprotein, which might be related to antigenicity. Another variation of Q81R was observed in glycoprotein compared with SEOV 80-39 segment of coded amino acid of international reference strain, which might also cause the change in antigenicity. Conclusion: The high positive rate of hantavirus in rodents in the port area of Ningde- would increase the risk of natural human infection and epidemic in local area. The hantavirus positive rodents in this focus might be from an endemic area in Shandong. It is necessary to strengthen the imported rodent control in the port area of Ningde. The virus detected in 2 positive samples belonged to SEOV subtype Ⅲ and shared high homologies of nucleotides and amino acid sequences with the hantavirus strains in surrounding area. However, some slight variations occurred in glycoprotein and nucleoprotein amino acid sequences, which might cause changes in its antigeniity.

q-LAMP Assays for the Detection of Botryosphaeria dothidea Causing Chinese Hickory Canker in Trunk, Water, and Air Samples

Trunk canker disease caused by Botryosphaeria dothidea with a prolonged latent infection phase poses a serious threat to Chinese hickory production. To further understand the epidemiological characteristics and develop reasonable management techniques, a quantitative loop-mediated isothermal amplification (q-LAMP) assay was developed to quantitatively monitor B. dothidea in hickory plants, water, and air samples. Specific primers were designed based on the different sites of the β-tubulin sequence between B. dothidea and other fungi commonly found on Chinese hickory. At the optimum reaction temperature of 65.9°C, this loop-mediated isothermal amplification (LAMP) assay can specifically distinguish B. dothidea from other tested fungi. The limit of detection of LAMP assays for B. dothidea was 0.001 ng/µl of pure genomic DNA and 10 spores per 1 ml of water. The q-LAMP assay enables rapid detection of B. dothidea within 60 min in hickory trunk, water in hickory forests, and spores captured on tapes. These results provide a powerful and convenient tool for monitoring B. dothidea, which could be applied widely in epidemiology, forecast, and management of tree canker disease.

[Epidemiological investigation and analysis of the effect of using diapers on daytime urinary incontinence on children]

Objective: To investigate the relationship between the incidence of daytime urinary incontinence(DUI)and the usage of diapers. Methods: The stratified sampling method was used to investigate the relationship between the incidence of DUI and the usage of diapers on children from 3 to 10 years old from 30 kindergarten and primary schools in Henan Province, China. The survey was carried out in the way of anonymous questionnaire. Results: A total of 8 560 qualified questionnaires(96.2%) were collected and used for statistical analysis. The overall incidence of DUI was 3.52%. With the age increasing, the incidence of DUI was decreased(χ(2)(trend)=75.690, P<0.001) from 6.06% for 3 years old children to 1.82% for 10 years old children. With the time of usage diapers increased, the rate of urination training was significantly reduced(χ(2)(trend)=84.260, P<0.001), and the incidence of DUI was significantly increased(χ(2)(trend)=18.824, P<0.001). With the increase of using diapers, the incidence of DUI increased (χ(2)(trend)=9.234, P<0.01). With the delay of the starting time of urination training, the incidence of DUI was increasing( χ(2)(trend)=9.775, P<0.01). Logistic regression analysis showed that the increase of time of using diapers(OR=1.017, 95% CI: 1.006-1.027, P<0.01)and the increase of frequency of using diapers(OR=1.290, 95% CI: 1.002-1.025, P<0.05)contribute to DUI significantly. Urination training starts from 0 to 6 months was a protective factor against DUI(OR=0.529, 95% CI: 0.345-0.811, P<0.01). Conclusions: The usage of diapers is the risk factor of DUI. It's better to start urination training earlier to help reduce the incidence of DUI in children.

Proteome analysis of the liver in the Chinese fire-bellied newt Cynops orientalis

The Chinese fire-bellied newt, Cynops orientalis, belonging to Amphibia, Caudata, Salamandridae is a species endemic to China. The liver, which is an important digestive gland and the largest amphibian organ, has various functions, including detoxification, glycogen storage, protein synthesis, and hormone production. However, the newt liver has rarely been studied at the molecular level. We performed histomorphology and high-throughput proteomic analysis of the Chinese fire-bellied newt liver, using hematoxylin and eosin (H&E) staining and two-dimensional electrophoresis coupled with mass spectrometry. The H&E staining showed that the newt liver nuclei are large and round, are located in the lateral cytoplasm, and contain a large quantity of lipid droplets. Melanins were abundantly present throughout the hepatic parenchyma. The proteome analysis showed a total of 545 proteins detected in the newt liver. Furthermore, a gene ontology analysis suggested that these proteins were associated with metabolism, immune response, cellular homeostasis, etc. Among these, proteins with metabolic functions were found to be the most abundant and highly expressed. This supports the role of the liver as the metabolic center. The proteomic results provide new insights into the aspects of the liver proteomes of the Chinese fire-bellied newt. The identification of a more global liver proteome in the newt may provide a basis for characterizing and comparing the liver proteomes from other amphibian species.

The antimicrobial peptide sublancin ameliorates necrotic enteritis induced by Clostridium perfringens in broilers

Sublancin is an antimicrobial peptide produced by 168 containing 37 amino acids. The objective of this study was to investigate its inhibitory efficacy against both in vitro and in vivo. In the in vitro study, we determined that sublancin had a minimum inhibitory concentration of 8 μM against , which was much higher than the antibiotic lincomycin (0.281 μM). Scanning electron microscopy showed that sublancin damaged the morphology of . The in vivo study was conducted on broilers for a 28-d period using a completely randomized design. A total of 252 chickens at 1 d of age were randomly assigned to 1 of 6 treatments including an uninfected control; an infected control; 3 infected groups supplemented with sublancin at 2.88, 5.76, or 11.52 mg activity/L of water; and an infected group supplemented with lincomycin at 75 mg activity/L of water (positive control). Necrotic enteritis was induced in the broilers by oral inoculation of on d 15 through 21. Thereafter, the sublancin or lincomycin were administered fresh daily for a period of 7 days. The challenge resulted in a significant decrease in ADG ( < 0.05) and a remarkable deterioration in G:F ( < 0.05) during d 15 to 21 of the experiment. There was a sharp increase of numbers in the cecum ( < 0.05). The addition of sublancin or lincomycin reduced caecal counts ( < 0.05). The counts had a tendency to decrease in the lincomycin treatment ( = 0.051) but were the highest in the sublancin treatment (5.76 mg activity/L of water). A higher villus height to crypt depth ratio in the duodenum and jejunum as well as a higher villus height in the duodenum were observed in broilers treated with sublancin or lincomycin ( < 0.05) compared with infected control broilers. It was observed that sublancin and lincomycin decreased IL-1β, IL-6, and tumor necrosis factor-α levels ( < 0.05) in the ileum compared with the infected control. In conclusion, although sublancin's minimum inhibitory concentration is much higher than lincomycin in vitro, less sublancin is needed to control necrotic enteritis induced by in vivo than lincomycin. These novel findings indicate that sublancin could be used as a potential antimicrobial agent to control necrotic enteritis.

[Phosphatase and tensin homolog deleted on chromosome ten/phosphatidyl Inositol 3-kinase/vascular endothelial growth factor signaling pathway changes in the rabbit Kawasaki disease model]

OBJECTIVE

To observe the changes of phosphatase and tensin homolog deleted on chromosome ten(PTEN)/ phosphatidyl Inositol 3-kinase(PI3K)/ vascular endothelial growth factor(VEGF)signaling pathway in a rabbit Kawasaki disease model.

METHODS

Model of Kawasaki disease was established in weanling Japanese big-eared rabbits with 10% bovine serum venous injection (2.5 ml/kg, 2 times, and 2 week's interval) through the ear. Twenty four rabbits were divided into 4 groups: control group (without injection of 10% bovine serum albumin, six rabbits); 1 day group (sacrificed a the second day after the establishment of Kawasaki disease models, six rabbits); 7 day group (sacrificed at the seventh day after establishment of Kawasaki disease model, six rabbits); 30 day group (sacrificed at the thirtieth day after establishment of Kawasaki disease model, six rabbits). Pathological analysis was performed on coronary artery tissue samples. The express of PTEN and PI3K were detected by immunohistochemistry. The levels of VEGF and CK were also examined with ELISA and white blood cells were counted.

RESULTS

(1) Coronary artery of model groups was thinner, distorted and had enlarged lumen. (2) PTEN expression in 1 d group, 7 d group and 30 d group were 58.5 ± 12.9, 73.2±9.9 and 109.6 ± 24.4, respectively, significantly higher than in the control group (25.5 ± 6.9, P<0.01 or 0.05). (3) The express of PI3K was significantly upregulated in 1 d group(57.2±11.1)and 7 d group(39.9±4.8) compared to control group(19.1±3.5, P<0.01 or 0.05). The expression level of PI3K in 30 d group was 18.8 ± 7.5, which was similar as control group (P>0.05) and significantly lower than 1 d and 7 d group (both P<0.05). (4) Similarly, the level of VEGF in 1 d group, 7 d group ((89.1 ± 15.5) ng/L, (76.9±9.9) ng/L) were significantly higher while it was significantly lower in 30 d group ((19.8 ± 4.4)ng/L) compared with the control group ((33.9 ± 6.7) ng/L, P<0.01 or 0.05). The level of VEGF in 7 d group was significantly lower than in 1 d group (P<0.05) and the level of VEGF was significantly lower in 30 d group than in 7 d group (P<0.01). (5)Creatine kinase levels were significantly higher in 30 d group than in control group (P<0.05) and there were no significantly different between control group, 1 d group and 7 d group(all P>0.05). (6)White blood cell count were significantly higher in 1 d group, 7 d group and 30 d group than in control group (all P<0.01).

CONCLUSION

The level of PTEN/PI3K/VEGF signaling pathway change after establishment of rabbit Kawasaki disease model and the signaling pathway might be involved in this model.

Observation of Kawasaki disease-related indexes and the study of relationship between myocardial enzyme changes and coronary artery lesions

OBJECTIVE

To discuss the significance of Kawasaki disease-related laboratory indicators and relationship between myocardial enzyme changes and myocardial enzyme changes in children with Kawasaki disease.

PATIENTS AND METHODS

Make an observation of C-reactive proteins and immune globulin changes in children with Kawasaki disease, and also a comparison about the myocardial enzyme changes between the children with myocardial enzyme changes and others without lesions.

RESULTS

Compare the study group before treatment with the control group of normal children, there are significant differences in the levels of CRP, IgG, and IgM, and the difference was statistically significant (p < 0.05); make a comparison about the levels of AST, LDH, CK, HB-DH, and CK-MB in the group with or without coronary artery lesions, the difference was not statistically significant (p > 0.05).

CONCLUSIONS

Relevant laboratory indices play an important role in the early diagnosis of Kawasaki disease. Myocardial injury and coronary artery lesions in children with Kawasaki disease have no correlation between each other, and there has an inconsistency characteristic.

Establishment of an acute rejection model by transplanting both renal grafts into two different rats using a modified method of ureterovesical anastomosis

OBJECTIVE

To establish an acute rejection model after kidney transplantation in the rat using a modified method of ureterovesical anastomosis.

METHODS

Thirty-nine Wistar rat donors, were transplanted into 70 male SD rats. Wistar rats (group 1; n = 18) underwent harvest of both kidneys, cold perfusion, and transplantation into 36 SD rats. Wistar rats (group 2; n = 18) underwent left kidney harvest, cold perfusion and transplantation into 18 SD rats. Groups 1 and 2 did not receive immunosuppression after transplantation. Six kidneys were harvested from 3 Wistar rats (group 3), were transplanted into 6 SD rats that were treated with CsA (5 mg/kg per day) postoperatively, and humanely killed at 21 days. There were 10 SD in sham operated rats (group 4). The renal allograft vein was end-to-end anastomosed to the recipient renal vein using an epidural catheter. The renal allograft was anastomosed end-to-side to the recipient abdominal aorta with an abdominal aortic flap. The renal allograft ureterovesical flap was directly inserted into the recipient bladder, and attached by 4-5 interrupted sutures. The recipient's right kidney vessels were ligated at 3 days postoperatively.

RESULTS

The success rates were 91.7% and 88.9% in groups 1 and 2, respectively. Except for the time for removal of the renal allografts, the operative durations and warm ischemia times differed insignificantly between both groups (P > .05). Blood creatinine levels increased significantly after kidney transplantation in groups 1 and 2 compared with the sham operated and CsA-treated cohorts (P < .01), but insignificantly between groups 1 and 2 (P > .05).

CONCLUSIONS

A dual renal allograft model was established in the rat using a modified ureterovesical anastomosis. The technique can be reproduced reliably, reducing costs and shorten using overall operative duration.

Formation of intermetallic compound layer in multi-laminated Ni-(TiB2/Al) composite sheets during annealing treatment

Solid-state reactive diffusion between Ni and Al was investigated during annealing at 650°C by employing multi-laminated Ni-(TiB(2)/Al) composite sheets. In multi-laminated Ni-(TiB(2)/Al) composite sheets annealed up to 5min NiAl(3) was the only phase observed in the diffusion zone, and Ni(2)Al(3) appeared after longer annealing time. Most grains of Ni(2)Al(3) showed equiaxed morphology rather than columnar microstructures like NiAl(3), due to the low concentration gradients of Al and Ni at the Ni/NiAl(3) interface. The preferential formation of this intermetallic compound NiAl(3) in multi-laminated Ni-(TiB(2)/Al) composite sheets was predicted using an effective heat of formation model. The present work indicated that both Ni and Al interdiffused, and the formation of NiAl(3) was a reaction-diffusion process.

Human papilloma virus screening by hybrid capture II in Chinese women of Jiangsu Province

OBJECTIVE

To survey Human Papilloma Virus (HPV) infection in Chinese Women of Jiangsu Province and discuss the relationship between HPV and the biology of cervical cancer.

METHODS

Two thousand, one hundred and fifty-three sexually active women (including 66 cases of cervical cancer) were selected for high-risk human papilloma virus DNA test with Hybrid Capture II (HCII).

RESULTS

The overall HPV prevalence was 32.6% (701/2153) with higher positive rates in cervical carcinoma and Cervical Interstitial Neoplasia (CIN) [93.9% and 54.6%] respectively. For women aged 40-59 years, the overall high-risk HPV prevalence was higher than those of other age groups. Compared with CIN I, the positivity rate and viral load of HPV DNA in CIN III is much higher (80.2% vs. 29.9%, 11.89 vs. 0.53). Ninety-four per cent (64/66) of patients with Cervical cancer were detected to be HPV positive. There was no significant difference in HPV DNA among each clinical stage and pathologic grade. But the positive rates and the value of HPV DNA were higher in the patients with cervical interstitial incursion. Eighty per cent of patients (20/25) could become negative within six months after operation.

CONCLUSIONS

High-risk HPV DNA test is effective in screening for cervical diseases. HCII is an effective method to detect HPV DNA.

Inhibition of matrix metalloproteinase-9 attenuates acute small-for-size liver graft injury in rats

Ischemia/reperfusion (I/R) and portal hypertension have been implicated in small-for-size liver graft dysfunction. Matrix metalloproteinases-2 and -9 (MMP-2/9) are critically proposed to involve in hepatic I/R injury and activated by hemodynamic force. We hypothesized that MMP-2/9 overexpression played a crucial role in acute graft injury following small-for-size liver transplantation (LT). Rats were randomly assigned into four groups: 75% partial hepatectomy (PH); 100% LT; 25% LT and 25% LT treated with CTT peptide (MMP-2/9 inhibitor). ELISA, real-time PCR, gelatin zymography and immunohistochemistry were used to determine the expression pattern of MMP-2/9 in liver tissue. MMP-9 expression was significantly increased 6 h after reperfusion and reached a peak 12 h in the 25% LT group, whereas MMP-2 was expressed in all groups invariably. Compared with the 25% LT group, rats from CTT-treated group exhibited markedly decreased alanine aminotransferase and total bilirubin values, downregulated proinflammatory cytokines, attenuated malondialdehyde (MDA) and myeloperoxidase (MPO) activities, and improved liver histology. Likewise, MMP-9 inhibition significantly reduced number of TUNEL-positive cells and caspase-3 activity, along with decreased protein levels of Fas and Fas-L. Specifically, rat survival was also improved in the CTT-treated group. These results support critical function of MMP-9 involved in acute small-for-size livergraft injury.

Clinical value of tumour specific growth factor (TSGF) and carbohydrate antigen-125 (CA-125) in carcinoma of the endometrium

This study estimated the clinical value of tumour specific growth factor (TSGF) and carbohydrate antigen-125 (CA-125) in the diagnosis of endometrial carcinoma. Blood was collected from the peripheral and uterine veins of endometrial cancer patients, and serum TSGF and CA-125 levels were compared with those in uterine myoma patients (non-tumour controls) and normal women. Significantly higher levels of TSGF and TGSF-positive rates were observed in endometrial cancer patients versus non-tumour and normal controls. The sensitivity and specificity for detecting TGSF-positive rates in the endometrial carcinoma group were 64.9% and 62.5%, respectively. The TSGF levels in uterine blood were significantly higher than in peripheral blood and the TSGF-positive rate was also higher. The TSGF levels gradually increased with progression through the clinical stages and pathological grades of endometrial carcinoma. The sensitivity and specificity of combined TSGF and CA-125 for detecting endometrial cancer were 75.7% and 56.3%, respectively. It is concluded that there is an important correlation between serum levels of TSGF, CA-125 and endometrial cancer and that measurement of both TSGF and CA-125 combined would be of value in the diagnosis of endometrial carcinoma.

Suspended aggregates as an immobilization mode for high-density perfusion culture of HEK 293 cells in a stirred tank bioreactor

Cells of the human embryonic kidney cell line (HEK 293) grown in repeated suspension and perfusion systems were characterized and described. Cell aggregates that formed immediately after the HEK 293 cells were inoculated in stirred vessels in serum-containing Dulbecco's modified Eagle's medium (D-MEM)/F-12 medium. The mean diameter of the cell aggregates reflecting the aggregate size increased with culture time, shifting from 63 to 239 mum after 1 and 8 days of culture in spinner flasks, respectively. No significant differences in cell performance were observed between HEK 293 cell populations grown as suspended aggregates and those grown as anchored monolayers. Replacing the D-MEM/F-12 with CD 293 medium caused the compact spherical cell aggregates to dissociate into single cells and small irregular aggregates without any apparent effect on cell performance. Moreover, the spherical cell aggregates could reform from individual cells and small aggregates when exposed to the serum-containing D-MEM/F-12 dominant medium. Perfusion culture of HEK 293 cells grown as suspended aggregates in a 7.5-l stirred tank bioreactor for 17 days resulted in a maximum viable cell density of 1.2 x 10(7) cells ml(-1). These results demonstrate the feasibility and proof-of-concept for using aggregates as an immobilization system in large-scale stirred bioreactors because a small-scale culture can be used as easily as the inoculum for larger bioreactors.

Modulation by divalent cations of GABA rho 1 receptor from human retina expressed in Xenopus oocytes

OBJECTIVE

To investigate functional homooligomeric GABA rho 1 receptors expressed in Xenopus oocytes and the modulation of divalent cations.

METHODS

GABA rho 1 cDNA from human retina was transcribed in vitro to obtain sense rho 1 mRNA, which was microinjected into Xenopus oocytes. Two-electrodes voltage clamp technique was performed to record GABA-induced currents.

RESULTS

Expressed receptors were found to have similar properties to GABAc receptors characterized in the retina. Cl-currents induced by GABA were blocked by picrotoxin instead of bicuculline. GABA-induced currents reversed at -19 +/- 2.5 mV, and EC50 was 3.3 mumol/L. Zn++ modulated GABA-induced currents with an IC50 = 9.6 mumol/L. Ni++, Cu++ and Cd++ inhibited GABA rho 1 obviously, too. Their rank order of potency was Zn++ > Ni++ > Cu++ > Cd++.

CONCLUSION

Zinc (10 mumol/L) inhibited GABA-induced currents in a competitive manner, and its action was sensitive to extracellular pH. Site-directed mutagenesis revealed that substitution of a single histidine residue (H44 and H48) failed to affect zinc sensitivity.

Serum cytokine levels are altered in patients with West syndrome

The objective of this study is to explore the neuroimmunomodulator effect of interleukin (IL)-2, tumor necrosis factor (TNF)-alpha and interferon (IFN)-alpha in West syndrome (WS). Twenty-three cases of WS (13 males and 10 females, aged 4-14 months old) who first visited and consisted from 10 cryptogenic and 13 symptomatic, were enrolled in this study. Double-antibody sandwich enzyme-linked immunosorbent assay was used to measure serum IL-2, TNF-alpha and IFN-alpha levels in 23 patients with WS and the data were compared to those of 15 healthy infants who were matched with regard to age and sex. Levels of all three cytokines were significantly higher in both cryptogenic and symptomatic WS groups than the control group. Serum IL-2 levels in symptomatic WS were significantly higher than that in cryptogenic WS. There was a positive correlation between IL-2 and TNF-alpha in both cryptogenic and symptomatic WS groups. The immune systems of patients with WS are in an activated state. An imbalance in cytokine levels may be involved in the immunopathology of WS.

[Modulation of SKF38393 and clonidine on expressed GABA(A) receptors in Xenopus oocytes]

AIM AND METHODS

The present research is performed on Xenopus oocytes injected with rat DRG mRNA. Modulatory effects of SKF38393 and Clonidine on GABAS(A) receptors expressed in Xenopus oocytes was investigated by two-electrodes voltage-clamp technique, and it is compared with the neurons fresh isolated.

RESULTS

It is found that SKF38393 and Clonidine inhibitable GABA(A) receptor function obviously by a concentration-dependent manner. There is an interaction between SKF38393- and Clonidine-induced currents. The inhibition of SKF38393 and Clonidine on GABA(A) receptors is noncompetitive and voltage-independent.

CONCLUSIONS

The results suggest that the inhibition by SKF38393 and clonidine of GABA-activated current might be a result of phosphorylation of GABA(A) receptor following action of second messenger and the thereby mediated intracellular transduction.

[Lithotripsy for residual cholelithes by rigid choledochoscopy]

OBJECTIVE

To evaluate a new lithotomy for postoperatively residual cholelithes.

METHOD

Using rigid choledochoscopy to extract the residual cholelithes which could hardly be extracted by fibrocholedochoscopy through the T-tube sinus in 31 cases.

RESULT

The residual cholelithes were extracted in 30 cases, reoperation was avoided.

CONCLUSION

The residual cholelithes can be effectively extracted by the rigid choledochoscopy plus mechanical lithotripsy through T-tube sinus.

[Genetic instability in cancer tissues analyzed by RAPD PCR]

In five kinds of tumors, total 128 specimens were analyzed by RAPD (random amplified polymorphic DNA) PCR with nine 10-base arbitrary primers for detecting instabilities of DNA and chromosome and screening new molecular markers coupled to putative or unknown oncogenes and/or tumor suppressor genes. Bands representing instabilities have been recovered and purified from agarose and cloned into pCAPs vector, and further labeled by DIG as probes for analysis of Southern blot, Northern blot and Sequencing. Results revealed that sample 5 and 3 of the gastric cancers showed the highest genomic changes and the average detectability in five sorts of cancers was up to at least 40% (42.2%-49.4%), and that there were significant differences in the ability of each primer to detect genomic instability, which ranged from 27% to 68%. Despite the highest detectability of genetic instability (68%) in tumor tissues, primer 2 could produce stable profiles of DNA bands in normal tissue genome with good reproducibility. On the contrary, primer 8 was of the lowest one (27%). Band B of single copy found to be allelic losses in gastric and colon cancers according to RFLP analysis was of a novel sequence and registered by Gen-Bank (Accession Number AF151005). Therefore the genetic instabilities often concentrated on some special locuses of chromosome e.g. repetitive sequences etc. and coupled to carcinogenesis. It was impossible or difficult to get great achievements for cancer treatments with the procedure of gene therapy only to one oncogene or one tumor suppressor gene because the extensive DNA variations occurred during the progression of tumor. RAPD assay connected with other techniques was a good tool for the detection of genomic instabilities and direct screening of some new molecular markers related to tumor suppressor genes or oncogenes.

[The treatment of severe complications of laparoscopic cholecystectomy]

The treatment of 24 cases of severe complications of laparoscopic cholecystectomy (LC) in 1993-1998 is reported. Among them, 16 cases were from the other hospitals. The patients included 14 cases of bile duct injury, 3 cases of bile leak, 1 case of duodenal injury, 5 cases intraoperative hemorrhages, 1 case mediastinal emphysema. The data showed that bile duct injury was the most severe complication of LC. It is suggested that in order to prevent the complications a training of operators on adaptive exercise and standard intraoperative procedure should be undertaken. The diagnosis and treatment of severe complications are discussed and some useful advice is given in this paper.

[Inhibition by SKF38393 of GABA-activated currents in rat DRG neurons]

Experiments were performed on neurons freshly isolated from rat DRG using whole-cell patch-clamp techniques. The majority of the neurons examined were sensitive to GABA (60/70) in the concentration range from 10(-6) to 10(-3) mol/L, showing obvious desensitization. In the 60 GABA-sensitive cells, responses induced by selective agonist of dopamine D1 receptor SKF38393 [(+/-) SKF38393HCL] manifested three types: (1) outward current (7/60); (2) inward current (5/60) and (3) no detectable response (48/60). As compared with GABA-activated current, the amplitude of SKF38393-activated current are smaller and showed no apparent desensitization. When the neurons were treated with SKF38393 prior to application of GABA for 30 s, the GABA-activated current in majority of the cells (53/60) was inhibited, while the remaining six showed no effect. The effect of SKF38393 was dose dependent. That is, with SKF38393 at concentration of 10(-7), 10(-6), 10(-5) and 10(-4) mol/L, the GABA-activated current was inhibited by (24.8 +/- 2.6)% (n = 7), (26.8 +/- 1.5)% (n = 7), (35.6 +/- 1.2)% (n = 8) and (45.6 +/- 2.3)% (n = 8) respectively. By intracellular application of 10(-4) mol/L H-7, a potent inhibitor of protein kinase, the inhibitory effect of SKF38393 was abolished completely, a results suggesting that the inhibition by SKF38393 of the GABA-activated current might be a result of intracellular phosphorylation of GABAA receptor.

[Inhibitory effects of clonidine on GABA-activated currents in rat DRG neurons]

Whole-cell patch-clamp recordings were performed on neurons from freshly isolated rat dorsal root ganglion (DRG) to investigate modulatory effects of clonidine, an alpha 2-adrenoceptor agonist, on GABA-activated currents. In the majority of the neurons examined (72/75), GABA (10(-6)-10(-3) mol/L) induced a concentration-dependent inward current, which could be blocked by bicuculine (10(-4)-10(-5) mol/L). In 51 out of 72 cells, pretreatment with different dosages of clonidine (10(-8)-10(-4) mol/L) decreased the GABA (10(-4) mol/L)-activated current by 8.5%, 19.0%, 33.4%, 44.4% and 40.3%, respectively, while clonidine itself only induced a slight inward current in a few cells (12/72). The inhibitory action of clonidine blockable by yohimbine (10(-4) mol/L) was voltage-independent and did not change the membrane conductance during the activation of GABAA receptor. Unlike NA, (-)-isoproternol (10(-4)-10(-5) mol/L) exerted no effect on GABA-activated currents. Intracellular application of H-7 (10(-4) mol/L) via micropipette resulted in a significant blockade of clonidine inhibition (19/20) except one cell showing only a slight inhibition (11.2%). The results suggest that the inhibitory effect of clonidine on GABA-activated currents in DRG neurons might involve phosphorylation of GABAA receptor following activation of alpha 2-adrenoceptor through a mechanism of intracellular transduction.

Clinical report on 62 cases of acute dimethyl sulfate intoxication

Sixty-two cases of accidental acute intoxication from the inhalation of dimethyl sulfate (DMS) are reported. To facilitate clinical evaluation and treatment, as well as identification of capacity for physical labor, a grading system was established according to the history of exposure to DMS, symptoms and signs of respiratory mucosal irritation, findings on chest radiographs, and abnormalities of leukocyte count. Emergency treatment included prophylactic use of glucocorticoids, supplemental oxygen, sedatives, and antibiotics for prevention and treatment of laryngeal and pulmonary edema, pulmonary infections, and other complications. Follow-up studies for 2-12 years have found only mild to moderate impairment in ventilatory capacity in eight cases, with no abnormal findings in ECG, chest films, and routine blood tests. Nearly all patients have resumed their usual work.

Amide proton exchange in the alpha-amylase polypeptide inhibitor Tendamistat studied by two-dimensional 1H nuclear magnetic resonance

The individual amide proton exchange rates in Tendamistat at pH 3.0 and 50 degrees C were measured by using two-dimensional 1H nuclear magnetic resonance. Overall, it was found that the distribution of exchange rates along the sequence is dominated by the interstrand hydrogen bonds of the beta-sheet structures. The slowly exchanging protons in the core of the two beta-sheets were shown to exchange via an EX2 mechanism. Further analysis of the data indicates that different large-scale structure fluctuations are responsible for the exchange from the two beta-sheets, even though the three-dimensional structure of Tendamistat appears to consist of a single structural domain.

The reaction mechanism of N-benzoylimidazole with ribonucleotides

The reaction of uridine 3'-phosphate with benzoylimidazole in the absence and presence of a strong base was followed up by 31P and 1H nmr as well as paper electrophoresis. Possible reaction courses were proposed, the reaction rate constants were calculated and the reaction mechanism was discussed. It is possible to selectively acylate ribonucleotides with benzoylimidazole by appropriate choice of the base used.

The role of metaphosphate in the activation of the nucleotide by TPS and DCC in the oligonucleotide synthesis

The course of the activation of 3'-acetylthymidine 5'-phosphate by TPS and DCC were followed up by 31P FT nmr. The fact that the "metaphosphate" (delta-5.1) first becomes detectable only at later stage of the activation and does coexist with pyrophosphate and triphosphate suggests that the pyridinium derivative of "metaphosphate" is most probably not directly formed from the hypothetical mixed anhydride or active "pseudourea" right at the beginning of the reaction of pdTac with TPS or DCC, but rather formed at later stage of the activation reaction from the degradation of the pyro- and triphosphates by the activating agent. The mixed anhydride or the active "pseudourea" is most possibly the active key intermediate.