Objective To explore the effect of melatonin on mitochondria in streptozotocin (STZ)-induced diabetic rats and its potential mechanism. Methods The diabetic rat models were induced by intraperitoneal injection of STZ, and the diabetic rats were randomly divided into two groups: diabetes mellitus group (DM group) and melatonin-treated group (DM± MT group). The normal non-diabetic rats were served as control group. Mitochondrial membrane potential and mitochondrial swelling were measured, the expression of voltage-dependent anion channel (VDAC)was assayed by immunohistochemistry in the heart, liver and kidney among the different groups after 8 weeks. Results (1)Compared with DM group, mitochondrial membrane potential in the heart,liver and kidney were significantly elevated in DM± MT group (553.6± 193.5 vs. 311.4 ± 133.7;745.7±115.8 vs. 358.9±158.7; 951.6±246.1 vs. 425.8±177.9, all P＜0.05). (2)Compared with DM group, mitochondrial swelling in the heart, liver and kidney was reinforced in DM ± MT group. (3)Compared with DM group, the expressions of VDAC in the heart, liver and kidney were significantly up-regulated in DM± MT group (76.93 ± 8.263 vs. 58.59 ± 7.62, 50.69 ± 6.33 vs.40.11±6.30, 77.86±8.59 vs. 61.44± 12.86, all P＜0.05). Conclusions Melatonin has protective effect on the activity of mitochondria in the heart, liver and kidney in diabetic rats possibly by up-regulating the expression of VDAC.

Objective To study effects of polo-like kinase-1(PLK1)small interfering RNA(siRNA)on proliferation and apoptosis of undifferentiated human thyroid cancer cells.Methods 5 PLK1 siRNA(S1,S2,S3,S4 and S5)were constructed and used to transfect human thyroid cancer cell line ARO.RT-PCR was employed to pick out the most effective siRNA,which was then used to transfect ARO cell.RT-PCR and western blot were used to detect PLK1 expression in thyroid cancer cells,which were divided into different groups.MTT assay was performed to examine the effects of PLK1 siRNA on thyroid cancer cells in all groups.Apoptosis of thyroid cancer cells was observed by caspase-3 activity and TUNEL.Results All the 5 siRNA down-regulated PLK1 mRNA expression.among which S4 showed the best effect.S4 transfection could obviously inhibit proliferation of thyroid cancer cells in dose and time dependent manner.Compared with control groups,caspase-3 activity of cancer cells in s4 transfeeted group increased significantly.The effect of S4 transfection was dose and time dependent.TUNEL results showed apoptosis of cancer cells transfected by S4 siRNA was obvious and apoptosis of cells was dose-dependent.Conclusions PLK1 may play an important role in proliferation of undifferentiated thyroid carcinoma.PLK1 siRNA transfection can inhibit proliferation of throid cancer cell through apoptosis induction.

Objective To investigate the antimicrobial susceptibility of Pseudomonas aeruginosa (P. aeruginosa) isolated from Zhenjiang area to 13 routinely used antibiotics and identify the structure and dissemination of class Ⅰ integron. Methods K-B test was used to determine the resistant rate of 71 strains of P. aeruginosa. DNA template was extracted by boiling method, PCR method was utilized to detect class Ⅰintegron, and subsequently gene cassettes were analyzed by sequencing. Results The resistant rates to 13 routinely used antibiotics were quite different from 18. 3 to 77.5% among 71 strains of P. aeruginosa. The prevalence of class Ⅰ integron was 38%. These integrons include 5 gene cassettes ( aadB, aac (6) - Ⅱ , PSE-Ⅰ , dfrA17 and aadAS), in which dfrA17 and aadA5 gene cassette were frequently found. Comparing with the negative strains of integron, the positive strains of integron has obviously higher resistance to ten the antibiotics including piporacillin, piperacillin-tazobactam, ceftriaxone, cefepime, ceftazidime, gentamicin,amikacin, tobmmycin, levofloxacin, and ciprofloxacin. Conclusions The resistant rates of P. aeruginosa to 13 drugs were different, and the resistant rates of integron positive strains were obviously higher than integron negative strains, which indicates that integron may play an important role in multidrug reisistance of P. aeruginoosa.

Objective To explore the origin of ovarian high grade serous carcinoma(HGSC) through analysing the expression and significance of PAX8,PAX2,p53 and RAS in the ovary and fallopian tube of different types and grades of serous carcinoma. Methods A total of 44 cases tissue samples of ovarian tumor including 34 malignant ovarian tumor and 10 normal normal tissue (as control group) were collected from the admitted patients in Affiliated Tumor Hospital of Guangxi Medical University from January 2015 to January 2016. Fallopian tube tissues were segmented in accordance with the fimbria, ampulla, isthmus and the corresponding ovarian tissues were by the side. There were 34 cases of patients with ovarian cancer including 29 cases of epithelial ovarian cancer (27 serous carcinoma, 1 mucinous carcinoma,1 endometrioid adenocarcinoma)and 5 non-epithelial ovarian cancer(sex cord-interstitial tumor). Among 27 cases of patients with ovarian serous cancer,there were 23 HGSC and 4 low-grade ovarian serous cancer (LGSC). One hundred fifty-three cases of samples were diagnosed as ovarian serous cancer by Shandong University Affiliated Qilu Hospital from 2005 to 2013 and these samples were made tissue microarray.(1)To analyze the expression and differences of PAX8,PAX2,p53 and RAS in the above tissues and tissue microarray from ovarian and tubal of HGSC and control women by immunohistochemistry methods.(2)To compare the expression levels of PAX8,PAX2,p53 and RAS in ovarian and fallopian tubes of ovarian cancer patients with different pathological types. (3) To analyze the correlations of tubal and ovarian tissue in PAX8,PAX2,p53 and RAS expression of HGSC.(4)To analyze the factors of the prognosis of ovarian serous cancer in tissue microarray by single factor analysis method. Results (1)PAX8,PAX2, p53 and RAS expression was negative in normal ovarian epithelium of control group,but the expression of PAX8, PAX2, p53 and RAS were strongly positive brown in secrete cells of normal fallopian tube epithelium.(2)p53 and RAS expression of fallopian tube epithelium in the epithelial ovarian cancer group were significantly higher than those in the non-epithelial ovarian cancer groups(P<0.05),but the expression of PAX8 and PAX2 in fallopian tube and the expression of PAX8,PAX2,p53 and RAS in ovarian tissue was not statistically significant in the groups(P>0.05).PAX8,PAX2 and p53 expression of the ovarian in HGSC group were significantly higher than those in LGSC group(P<0.05),while the expression of RAS was lower in the ovarian of the high-grade group (P<0.05), while the expression of PAX8, PAX2, p53 and RAS in fallopian tube was not statistically significant in the groups(P>0.05).(3)There was a significantly positive correlation between fallopian tube and the corresponding ovary of HGSC in PAX8 and PAX2 expression(r=0.422, P=0.045; r=0.693, P=0.000), but not correlation in p53 and RAS expression (r=0.058, P=0.793; r=-0.190,P=0.384).(4)Univariate survival analysis showed that the progression free survival time in patients with ovarian serous cancer group was significantly correlated with the protein expression of PAX8, PAX2 and RAS(P<0.05),but there were not correlated with age,surgical staging,cell differentiation,lymph node metastasis and preoperative chemotherapy and p53 protein expression (P>0.05). The total survival time in patients with ovarian serous cancer group was significantly correlated with the protein expression of PAX8 (P<0.05),but there were not correlated with age,surgical staging,cell differentiation,lymph node metastasis and preoperative chemotherapy and the protein expression of PAX2, RAS and p53 (P>0.05). Conclusions PAX8, PAX2, p53, RAS are of great significance for the study of origin of HGSC. HGSC may be derived from fallopian tube, but further investigation would be necessary to confirm this. PAX8, PAX2, p53, RAS could be expected to be used as predictors of survival prognosis in patients with ovarian serous cancer.