Background and purpose:PLAGL1 gene is a newly discovered gene, which could induce tumor cells’ apoptosis and cell cycle arrest. This study aimed to investigate the expression and the promoter methylation level ofPLAGL1 gene and its correlation withSDHB gene mutations in pheochromocytoma.Methods:The expressions of PLAGL1 mRNA was detected by real-time quantitative reverse transcription polymerase chain reaction (qRT-PCR) method in 13 cases of normal adrenal medulla, 32 cases of benign pheochromocytoma group and 54 cases of malignant pheochromocytoma. We examined the promoter methylation status by methylation-speciifc polymerase chain reaction (MSP) andSDHB gene mutation by qRT-PCR ampliifcation and direct sequencing.Results:The relative expression volume ofPLAGL1 gene in malignant tumor tissue was (0.527±0.201), which was signiifcant lower than those in benigntumor tissue and normal adrenal medulla[(1.517±0.662) and (1.734±0.756)]. There was no remarkable difference between benign tumor tissue and normal tissue forPLAGL1 gene expression and promoter methylation.PLAGL1 gene methylation rate in malignant tumor tissue, benign tumor tissue and normal adrenal medulla were 68.5%, 18.8% and 15.4% respectively.SDHB gene mutation was detected in 7 malignant tumor tissues, while no mutation was found in benign and normal group.Conclusion:Lower expression status ofPLAGL1 gene showed signiifcant correlation with promoter methylation which may be associated withSDHB gene mutation.

Background and purpose:The symptoms of pancreatic neuroendocrine neoplasms (PNENs) are complicated, that might lead to misdiagnosis. This study aimed to detect the expression level of DJ-1 in PNENs and explore the clinical significance of DJ-1 in PNENs.Methods:DJ-1 protien levels in the serum of 16 cases of PNENs patients and 25 cases of healthy persons were detected by ELISA analysis; The expressions of DJ-1 in 78 cases of PNENs tissues were detected by immunohistochemical staining.Results:The DJ-1 level in the serum of PNENs patients was signiifcantly higher than healthy persons (36.19±6.71vs 24.68±5.94 ng/mL;P<0.001);53.8% (42/78) cases of PNENs tissues showed DJ-1 positive staining; DJ-1 expression level in PNENs tissues had signiifcantly positive correlation with lymph node metastasis (P=0.033), distant metastasis (P=0.017), TNM stage (P=0.012), and pathology grade (P=0.049); As a dependent risk factor, DJ-1 expression was signiifcantly associated with shorter OS (P=0.003) and DFS (P=0.018) of PNENs patients.Conclusion:High expression of DJ-1 protein correlated with invasion and metastasis, disease progression, and poor prognosis in PNEN.

Objective To investigate the significance of PI3K/AKT signal transduetion pathway in gastrointestinal stromal tumors(GIST).Methods The expression of PI3K、Akt、PTEN were detected with RT-PCR and Westem-blot of tumor specimens from 124 GIST cases and the corresponding normal gastric mucosa.Results In gastrointestinal stromal tumors,the tumor suppressor gene-PTEN was on low expression as with the inereased expression of PI3K and Akt.The positive expression rate of PTEN,PI3K and Akt was not statistically correlated with patients'demographics and tumor histological type,but they are significantly correlated with lymphatic metastasis and mucosal invasion.The expression of PI3 K and Akt are of significantly positive correlation(r=0.292,P=0.031).The expression of PI3K and PTEN are of significantly negetive correlation(r=-0.412,P=0.036).The expression of PTEN and Akt are of significantly negetive correlation(r=-0.386,P=0.024).Conclusion PI3 K/Akt and P,PTEN may have bean on reciprocally suppressive effect during the development of GIST.

Background and purpose:This study investigated the relationship between (S100 calcium-binding protein A4, S100A4) in chronic gastritis, intestinal metaplasia, dysplasia adenomatous, normal tissue tissue samples and expression in gastric cancer and clinical characteristics. Methods:HE staining of the use of gastric specimens taken for histopathological diagnosis;using immunohistochemistry to detect the expression of tissue S100A4 protein;qRT-PCR was used to detect mRNA expression of S100A4 gene;Western Blot detection of S100A4 gene encoding protein. Kaplan-Meier survival curves were used to distinguish and compare survival. Results:S100A4 protein and mRNA expression gradually increased in the following order:normal tissue

ObjectiveTo investigate the surgical management of left renal vein entrapment syndrome.MethodsEight cases with left renal vein entrapment syndrome (5 males and 3 female ; mean age 26 years) with history of gross hematuria for 3 to 46 months were reviewed.Doppler ultrasound reports suggested compression of the left renal vein at mesenteric angle in all cases.And the dilated segment of the left vein was three-fold than the stricture segment in diameter.CT scan showed the abnormal angle between aorta and superior mesentery artery in all cases.Bleeding from the left ureteral orifice was detected by cystoscopy in 6 cases.We treated 8 patients by extravascular stent immobilization with laparoscope.ResultsThe operation was successful in the 8 cases without surgical complications.The average operation time was 63 min.The average blood loss was 14 ml,and the average hospital stay after operation was 6 days.Follow-up of 3 -20 months,there was no hematuria relapse since been relieved in 7 cases,one case remained microscopic hematuria.Color Doppler ultrasound examination in all 8 cases showed the narrowest inner diameter of left renal vein was 7.4 mm (6.5 - 8.7 mm),the blood flow was smooth.The angle between abdominal aorta and superior mesenteric artery become normal.Conclusions Laparoscopic left renal vein extravascular stenting could be a new surgical method to treat left renal vein entrapment syndrome.The method of putting artificial blood vessel around renal vein is simple,safe and effective.

OBJECTIVE　To detect the trace glutaraldehyde in the fluid from venous circuit tube of hemodialysis,a HPLC assay was developed.METHODS　20 mL fluid taken from the venous circuit tube were derived with DNPH for 3 h,then filtered and injected. Chromatography was conducted on C18 column at 29℃.The mobile phase was consisted of 60% CH3N and 40% H3PO4 with the flow rate at 1 mL*min-1, and the detetion wavelength was at 365 nm.RESULTS　The concentrations of glutaraldehyde in the fluid ranged from 14.99 to 37.40 μg.mL-1.CONCLUSION　This HPLC method is simple and accurate to detect the trace glutaraldehyde remained in the fluid from venous circuit tube.

Objective:To investigate the effect and molecular mechanism of circ_0001955 on the radiosensitivity of prostate cancer DU145 cells.Methods:The si-con, si-circ_0001955, miR-con and miR-149 were transfected into DU145 cells and recorded as the si-con group, si-circ_0001955 group, miR-con group, miR-149 group. The miR-149 and pc-circ_0001955 were co-transfected into DU145 cells and recorded as the miR-149+ pc-circ_0001955 group. Untreated cells were used as the blank control (NC) group. Real-time quantitative PCR was employed to detect the expression levels of circ_0001955 and miR-149. MTT assay was performed to detect cell viability. Flow cytometry was carried out to detect cell apoptosis. Transwell chamber assay was conducted to observe cell migration and invasion. Western blot was performed to detect the expression levels of MMP-2, MMP-9, Cleaved caspase-3, Cleaved caspase-9 and γ-H 2AX proteins. Colony formation assay was employed to determine the cell radiosensitivity. Dual-luciferase reporter assay was conducted to verify the targeting relationship between circ_0001955 and miR-149. Results:The circ_0001955 was highly expressed, whereas the miR-149 was lowly expressed in prostate cancer DU145 cells. Silencing circ_0001955 or over-expressing miR-149 could decrease the cell viability, migration and invasion, down-regulate the expression levels of MMP-2 and MMP-9, up-regulate the expression levels of Cleaved caspase-3 and Cleaved caspase-9, and increase the apoptosis rate (all P<0.05). After 4 Gy dose irradiation, the expression level of γ-H 2AX was up-regulated, the cell survival fraction was decreased, and the sensitivity ratio was 1.38. circ_0001955 could targetedly regulate the expression level of miR-149. After simultaneous overexpression of circ_0001955 and miR-149, cell proliferation activity and the number of migrating and invading cells were increased, cell apoptosis rate was decreased, and cell survival fraction was increased, and the sensitivity ratio was calculated as 0.72. Conclusion:Silencing circ_0001955 can targetedly up-regulate the expression level of miR-149, which inhibits the proliferation, migration, and invasion, induces cell cycle arrest, induces cell apoptosis and increases the radiosensitivity of prostate cancer DU145 cells.

Objective:To explore the feasibility and preliminary effect of improving the comprehensive quality of medical students by introducing the teaching model of cleft lip and palate treatment platform in medical education.Methods:A total of 40 grade two undergraduates of Shantou University medical college were randomly divided into experimental group ( n=20) and control group ( n=20). The students in the experimental group were the volunteers of Cleft lip and palate treatment center, receiving the characteristic idea and methods in clinical teaching. The control group received conventional teaching. The evaluation indicators, including the intellectual quality (60 points), moral quality (15 points), humanistic quality (5 points), physical and mental quality (10 points), social practice (10 points), were quantified by fuzzy evaluation method and a professional evaluation team was set up to evaluate the effect of teaching. SPSS 19.0 was used to perform t test for comparison between the two groups. Results:The average scores of the above items in the experimental group were respectively (51.477±2.381), (10.613±0.169), (4.228±0.124), (8.677±0.296), and (8.565±0.421), and the average total score was (83.559±2.333); the average scores of above items in the control group were respectively (49.746±3.176), (10.268±0.266), (4.008±0.195), (8.207±0.354), and (7.575±0.321), and the average total score was (79.804±3.510). Statistical difference was found in all scores except the intellectual quality score between the two group ( P<0.05). Conclusion:Though no significant difference was found in the intellectual quality, the other qualities have played important roles in improving medical students' comprehensive quality. It is significant to improve the medical students' comprehensive quality by the method of cleft lip and palate treatment platform.

【Objective】 To introduce a modified microdot two-layer microsurgical vasovasostomy (MVV) and to analyze its effectiveness in patients with vas deferens obstruction caused by inguinal herniorrhaphy. 【Methods】 Clinical data of patients treated during Mar.2015 and Oct.2020 were retrospectively analyzed. According to different surgical methods, the patients were divided into the modified group and traditional group. The general data, intraoperative conditions, efficacies and complications of the two groups were compared. 【Results】 There were 59 cases in the modified group, 54(91.5%) of whom were successfully followed up, and 41 cases in the traditional group, 38(92.7%) of whom were successfully followed up. There were no significant differences in age, inguinal herniorrhaphy history, and unilateral/bilateral ratio between the two groups (P>0.05). The average operation time for unilateral lesions in the modified group was shorter than that in the traditional group [(89.44±24.86) vs. (112.04±43.40) min, P=0.032]. The postoperative patency rate (83.3% vs.73.7%, P>0.05) and natural pregnancy rate (33.3% vs.28.9%, P>0.05) of the modified group and traditional group were comparable. Incision fat liquefaction occurred in 2 cases (3.70%) in the modified group and in 1 case (2.63%) in the traditional group (P>0.05). 【Conclusion】 The modified microdot two-layer MVV is a safe surgical method with comparable effectiveness as the traditional approach. By adjusting the position of the marking points and the order of suturing, it helps the management of sutures, reduces the difficulty of vasovasostomy, shortens operation time, and can be applied to repair vas deferens obstruction caused by inguinal herniorrhaphy.