Advances of structure and mechanisms of bromodomain-containing protein 4 and its related research in tumors / 生物工程学报

The bromodomain and extraterminal domain (Bet) family are the regulators of the epigenome and also the pivotal driving factors for the expression of tumor related genes that tumor cells depend on for survival and proliferation. Bromodomain-containing protein 4 (Brd4) is a member of the Bet protein family. Generally, Brd4 identifies acetylated histones and binds to the promoter or enhancer region of target genes to initiate and maintain expression of tumor related genes. Brd4 is closely related to the regulation of multiple transcription factors and chromatin modification and is involved in DNA damage repair and maintenance of telomere function, thus maintaining the survival of tumor cells. This review summarizes the structure and function of Brd4 protein and the application of its inhibitors in tumor research.

Dexmedetomidine Attenuates Neuropathic Pain by Inhibiting P2X7R Expression and ERK Phosphorylation in Rats

α2-Adrenoceptor agonists attenuate hypersensitivity under neuropathic conditions. However, the mechanisms underlying this attenuation remain largely unknown. In the present study, we explored the potential roles of purinergic receptor 7 (P2X7R)/extracellular signal-regulated kinase (ERK) signaling in the anti-nociceptive effect of dexmedetomidine in a rat model of neuropathic pain induced by chronic constriction injury (CCI) of the sciatic nerve. An animal model of CCI was adopted to mimic the clinical neuropathic pain state. Behavioral hypersensitivity to mechanical and thermal stimuli was determined by von Frey filament and Hargreaves' tests, and the spinal P2X7R expression level and ERK phosphorylation were analyzed using western blot analysis and immunohistochemistry. In parallel with the development of mechanical and thermal hyperalgesia, a significant increase in P2X7R expression was noted in the ipsilateral spinal cord on day 7 after CCI. Intrathecal administration of dexmedetomidine (2.5 µg) for 3 days not only attenuated neuropathic pain but also inhibited the CCI-induced P2X7R upregulation and ERK phosphorylation. Intrathecal dexmedetomidine administration did not produce obvious effects on locomotor function. The present study demonstrated that dexmedetomidine attenuates the neuropathic pain induced by CCI of the sciatic nerve in rats by inhibiting spinal P2X7R expression and ERK phosphorylation, indicating the potential therapeutic implications of dexmedetomidine administration for the treatment of neuropathic pain.

Management of medical equipment maintenance / 医疗卫生装备

Objective To explore the management methods of medical equipment maintenance. Methods Based on the staffing of hospital engineering technician, the difference between levels of hospitals in medical equipment maintenance management was explored from the aspects of maintenance, preventive maintenance, use training of medical equipment, medical equipment maintenance management system and etc. Results The management methods of medical equipment maintenance were different corresponding to the configurations of the departments of clinical engineering. Conclusion The maintenance management method corresponding to the staffing of hospital engineering technician as well as the correct use of modern medical equipment contribute to insuring the safety and reliability and enhancing the availability and utilization rate.

Investigation of Cif Gene Expression between Mucoid and Non-mucoid Pseudonmonas Aeruginosa / 现代检验医学杂志

Objective To compare the difference of the Cif gene expression and the inflammation markers (such as WBC and CRP et al)between mucoid and non-mucoid Pseudonmonasaeruginosa,combining with the clinical data.Methods Real-time RT-PCR was used to determine the expression level of Cif in Pseudonmonas aeruginosa and clinical data were collected to discuss the relationship among the number of WBC,the level of CRP and the Cif gene expression.Results The expression level of Cif gene in mucoid Pseudonmonas aeruginosa had a significantly higher than the non-mucoid Pseudonmonas aerugi-nosa,which was statistically significant (t=2.09,P0.05).The data also showed that the cystic fibrosis transmembrane conductance regulator in-hibitory factor (Cif)gene expression level had little correlation with the number of WBC (a=0.095,R2=0.029).Conclusion The expression of Cif gene may works for the biofilm formation of mucoid Pseudonmonas aeruginosa,which maybe a new virulence factor to Pseudonmonas aeruginosa.

Clinical distribution and drug resistance of 179 isolates of Streptococcus agalactia / 国际检验医学杂志

Objective To investigated the clinical distributions and antimicrobial susceptibility of Streptococcus agalactia strains isolated from the patients .Methods The identification and susceptibility of the strains were mainly measured by automatic VITEK‐Ⅱ system ,the K‐B disc diffusion tests were used for the resistance test of erythromycin ,meropenem ,and D‐test .Results The iso‐lates were mainly from urine (63 .1% ) ,genital tract(7 .8% ) and wound secretion(6 .7% ) .They were obtained from patients in dif‐ferent situations ,including 110 patients who were older than 50 years old (61 .5% ) ,113 female patients (63 .1% ) ,12 gravidas (6 .7% ) ,3 vertical transmitted newborns(1 .7% ) ,and 82 patients with cancer ,undergoing chemo radiotherapy ,with diabetes ,tuber‐culosis or after operations(45 .8% ) .The resistant rates of the isolated Streptococcus agalactia to erythromycin and clindamycin were 42 .9% -93 .3% and 41 .9% -80 .0% respectively .The positive rate of D‐test was 4 .1% .The strains were highly resistant to tet‐racycline(>80% ) ,while the resistance to penicillin was below 10% except in 2008 .All isolates were susceptible to vancomycin and meropenem .Only one strain was resistant to Quinupristin‐dalfopristin .Conclusion Streptococcus agalactia infection in adults most‐ly cause genitourinary tract ,skin and soft tissue infections .There were more females than males with Streptococcus agalactia infec‐tion .Penicillin andβ‐lactams are still the first choice for the treatment .Erythromycin ,clindamycin and tetracycline should be used with caution under the guidance of laboratory susceptibility test results .

Establishment and pathologic analysis of imatinib-resistant gastrointestinal stromal tumor xenografts / 中华病理学杂志

<p><b>OBJECTIVE</b>To establish and characterize imatinib-resistant gastrointestinal stromal tumor (GIST) xenografts. Further provided an ideal experimental platform through the imatinib-resistant GIST xenografts to investigate the mechanism of resistance to imatinib.</p><p><b>METHODS</b>Imatinib-resistant GIST cells were injected under the skin of athymic nude mice to establish animal models of human imatinib-resistant GIST. The molecular and histopathologic features of GIST xenografts were also analysed and compared with their counterpart of cell lines.</p><p><b>RESULTS</b>The xenograft tumor models had been established by subcutaneously injection of GIST cells into nude mice. Immunohistochemistry results showed CD117 expression was positive in GIST-PR2 xenograft tumor, but negative in GIST-R. In GIST-PR1, tumor areas showing rhabdomyoblastic differentiation were presented next to areas with classic GIST morphology. The rhabdomyoblastic component demonstrated consistently positivity for desmin and myogenin, whereas CD117 was completely negative. The mutation profiles of these xenograft tumors were the same as their counterpart of cell lines.</p><p><b>CONCLUSIONS</b>Human GIST xenografts with mutation in c-kit have been established from imatinib-resistant GIST lines. Those models will enable further studies on mechanisms of resistance, combination therapies and allow testing of novel targeted therapies.</p>

Prevalence estimates for primary brain tumors in China: a multi-center cross-sectional study / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Although the first leading cause of death in China was malignant neoplasms (mortality, 374.1 per 100,000 person-years), the full impact of primary brain tumors (PBT) on the healthcare system is not completely described because there are a few well documented reports about the epidemiologic features of brain tumors. This study aimed to report a comprehensive assessment on the prevalence of PBT.</p><p><b>METHODS</b>A multicenter cross-sectional study on brain tumor (MCSBT) in China was initiated in five regional centers: Daqing (northeast), Puyang (north of China), Shiyan (center of China), Ma'anshan (center of China) and Shanghai (southeast). Prevalence rate was calculated by counting the number of people living with a PBT between October 1, 2005 and September 30, 2006 and dividing by the total population of the five communities at January 1, 2006. Estimates of prevalence were expressed as percentages and grouped according to gender and to age in fifteen-year categories. Within these strata, the rates were estimated with 95% confidence intervals (CI) using the accurate calculation of CI for Poisson distribution. A chi-square test was used to compare the various frequencies with α < 0.05. Age-standardized prevalence with the direct method was calculated with the ten-year age-specific prevalence and the age distribution of the Chinese population in 2010, obtained from World population prospects: the 2008 revision.</p><p><b>RESULTS</b>We estimated that the overall prevalence of PBT was 24.56 per 100,000 (95%CI, 14.85 to 34.27), and the overall prevalence of PBT in female population (30.57 per 100,000 and its 95%CI ranged from 19.73 to 41.41) was higher than that in male population (18.84 per 100,000 and its 95%CI ranged from 10.33 to 27.35). However, the discrepancy between genders was not statistically significant because the 95%CI overlapped. Of 272 cases of newly diagnosed PBT, the proportion of histological subtypes by age groups, gender was statistically different (χ(2) = 52.6510, P < 0.0001). More than half of all reported tumors (52.57%) were either gliomas or meningiomas. For the youngest (aged from 0 - 19) strata of the population, glioma appeared to occur more than other subtypes, accounting for 55.56% of all of cases. The majority of brain tumors presented in those aged from 20 to 59 years was pituitary adenomas (45.12%) and gliomas (31.10%). Opposed to brain tumors in adults and teenage, gliomas only accounted for 22.22%. Meanwhile, the median ages at diagnosis of the patients with PBT were similar between males and females except for pituitary adenomas (male: 59 years old; female: 45 years old).</p><p><b>CONCLUSIONS</b>Age standardized prevalence of PBT is 22.52 per 100,000 (95%CI, 13.22 to 31.82) for all populations, 17.64 per 100,000 (95%CI, 9.41 to 25.87) for men, and 27.94 per 100,000 (95%CI, 17.58 to 38.30) for women. Age standardization to China's 2010 population yielded an estimated population of 304 954 cases with PBT. Our prevalence estimates provide a conservative basis on which to plan health care services and to develop programmatic strategies for surviving. In the future, it would be helpful to have long-term observed survival rates that would make the assumptions and the resulting imprecision in the current estimates unnecessary.</p>

Prevalence of hypertension and associated risk factors in Songnan community / 上海第二医科大学学报

Objective To investigate the prevalence and associated risk factors of hypertension in Songnan community so as to provide evidence for the early prevention of hypertension.Methods Cluster sampling was employed,and questionnaire survey was performed in 10 185 residents aged above 40 years in Songnan community of Baoshan District.The questionnaires involved with hypertension and associated risk factors.Results The prevalence of hypertension was 49.9% in Songnan community of Baoshan District,and that of men was significantly higher than that of women(53.7% vs 47.3%)(P

Therapeutic Effect of Shukou Powder for Experimental Periodontitis in Rats / 广州中医药大学学报

[Objective] To observe the therapeutic effect of Shukou Powder (SP) for experimental periodontitis in rats. [Methods] Seventy-five SD rats were randomized into five groups: normal, model, iodine glycerin (20 g/L), high-dose SP (200 g/L) and low-dose SP (100 g/L). The experimental periodontitis rat models were established by ligating molars with steel wire combined with intramuscularly injection of prednisolone (1.25mg, 8 times). Except that the model and normal groups were treated by applying saline, the other groups were treated by applying the corresponding drugs 0.5 mL to the peridentium, tid for 10 days. After treatment, debris index, probe depth and bleeding rate during probing were investigated and the pathological changes of periodontal tissues were also observed. [ Results ] Bleeding rate during probing decreased in high- and low-dose SP groups, debris index decreased in high-dose SP group, the difference being significant (P

Anxiety and its Relation to Coping Styles and Personality in Patients with Major Depression / 中国心理卫生杂志

Objective:To explore the relation among depression, anxiety, coping styles and personality in patients with major depression.Method:88 patients with major depression were assessed on admission. The assessments included Self-Rating Depression Scale (SDS), Self-Rating Anxiety Scale(SAS),Eysenck Personality Questionnaire and Coping Styles Questionnaire. Nighty normal controls were assessed with the same instruments too.Results:The patients were found having higher scores in Neuroticism and Psychoticism, and lower scores in Extroversion and positive coping styles than normal controls.Higher scores in SDS, SAS, Neuroticism, and Psychoticism, and lower scores in positive coping styles, were found in the patients with anxiety. Significant relationship was found among depression, SAS, Extroversion, and positive coping styles.The last three accounted for 52.0% of the variance of depression.Conclusion:The patients with major depression have high scores in Neuroticism and Psychoticism, and low in Extroversion and positive coping styles.Those with anxiety scored even higher in SDS, SAS, Neuroticism, and Psychoticism, and lower in positive coping styles.The application of little positwe coping styles moy be a part of Extrovision in major depresion.

Effect of Astragalosides on Gastrin Receptor in Gastric Parietal Cells of Rats with Spleen Deficiency / 广州中医药大学学报

[Objective] To observe the regulatory effect of astragalosides (AST) on the binding capacity of gastrin receptor in gastric parietal cells (GPC) of rats with spleen deficiency. [Methods] SD rats were given gastric gavage of Radix et Rhizoma Rhei (Dahuang) decoction 10 g/kg to induce spleen deficiency. Gastric parietal cells were isolated and purified by Lewin gastric sac method and Percoll density gradient separation method. 2 mL suspension of GPC from rat models was incubated in vitro with AST 20 ?L at the concentrations of 10, 20 and 30 g/L respectively. Suspension of GPC from rat models incubated with phosphate buffered saline (PBS) served as the model group and suspension of GPC from the normal rats incubated with PBS as the normal group. The binding capacity of gastrin receptor in GPC was detected by radioligand receptor assay. [Results] The binding sites were 262.29?60.80 in the model group, much lower than 443.93?133.58 in the normal group (P

Immunoregulation of Chloroform Component Extracted from Erteng Mixture on T Lymphocytes in Rheumatoid Arthritis / 广州中医药大学学报

[Objective] To investigate the effect of Erteng Mixture (EM) on activated T-cell CD69 expression and Jurkat cell cycle in rheumatoid arthritis (RA) and to explore its possible cellular immunoregulation mechanism. [Methods] Jurkat cells were cultured with different kinds of components extracted from EM. After 72 hours, proliferation rate of Jurkat cell were detected with thiazolyl blue colorimetry (MTT) to screen the active component. Whole blood from RA patients were incubated in RPMI-1640 culture with various concentrations of chlorofonn component extracted from EM or with Genistein. Thirty minutes later, phytahematoagglutinin (PHA) were added successively into the culture. After 24 hours, CD69 expression rate of T lymphocytes activated by PHA was analyzed by flow cytometry. Jurkat cells were cultured with various concentrations of chloroform component extracted from EM and with methotrexate ( MIX) for 48 hours. After then, Jurkat cell cycle was analyzed by flow cytometry. [ Results ] Chloroform component extracted from EM had the strongest inhibitive effect on proliferation of Jurkat cells. Chloroform component (10 mg/L and 20 mg/L) could markedly inhibit CD69 expression on PHA-activated T lymphocytes. Chloroform component 10 mg/L blocked Jurkat cell cycle at G1 phase, which differed from MTX blocking Jurkat cell cycle at S phase. [Conclusion] Chloroform component extracted from EM could significantly inhibit the early activation of CD4 T lymphocytes in RA and inhibit the energy and material synthesis in T-cell, thus hindering DNA synthesis and decreasing the cellular G2 phase transformation. This study will provide an experimental basis for clinical application of EM in treating RA.

Studies on Quality Standard for Kangtai Capsule / 中药新药与临床药理

Objective To establish a quality standard for Kangtai Capsule. Methods Kangtai Capsule was identified by TLC; the effective components in Kangtai Capsule were determined by HPLC. Results The relevant spots in Radix Paeoniae Alba, Radix Saposhnikoviae and Radix Aucklandlae were identified by TLC. the content of Paeoniflorin showed a good linearity in the range of 0.204～ 2.040 ? g, the average recovery rate was 97.9 % and RSD was 0.88 % . Conclusion This method is simple, feasible and repeatable, and can be used for quality control of Kangtai Capsule.

Correlation of Spleen-stomach Damp-heat Syndrome with Human Leucocyte Antigen Class Ⅱ Gene Polymorphism / 广州中医药大学学报

【Objective】To study the correlation of human leucocyte antigen(HLA) class Ⅱ allele with spleen-stomach damp-heat(SSDH) syndrome.【Methods】From those people with native place of Guangdong,16 healthy volunteers served as the normal control and 46 patients with chronic superficial gastritis or digestive ulceration were enrolled into the observation.Of 46 patients,26 were classified into SSDH and 20 into spleen deficiency(SD) syndrome.HLA-DRB1,HLA-DQA1,HLA-DQB1,and HLADPB1 alleles of HLA class Ⅱ from whole blood sample were analyzed by the method of polymerase chain reaction-sequence specific primers(PCR-SSP).【Results】The gene frequency of DQA1*0103 in SSDH group was remarkably higher than that in the normal control group(P

Content Determination of Brucine and Strychnine in Tongbiling Tablet by Reversed-phase HPLC / 广州中医药大学学报

[Objective] To establish a method for the determination of brucine and strychnine contents in Tongbiling Tablet. [Methods] Reversed-phase HPLC conditions were: Nucleodur C18 Gravity column (125 mm ? 4.6 mm, 5?m), mobile phrase being methanol-water (60:40) with 0.5 g potassium dihydrogen phosphate and 1.0 g dodecyl sodium sulfouate and 0.5 mL triethylamine in 1 000 mL mixture (adjusting pH to 4.5 with acetic acid) , detecting wavelength at 254 run and a flow rate of 1.0 mL/min at room temperature. [ Results ] The average recovery of brucine was 97.69 % ( RSD = 2.03%) and that of strychnine 97.93% ( RSD = 2.61%). [Conclusion] This method is efficient and can be used for the quality control of Tongbiling Tablet.