AIM　To study the effects of verapamil on end-plate potentials(EPPs) in isolated non-uniform stretched muscle preparation(INSMP) of rat diaphragms pretreated with neostigmine or 3,4-diaminopyridine(3,4-DAP). METHODS　Using conventional intracellular microelectrode recording technique. RESULTS A sustained depolarization could be induced at the end-plate area pre-incubated with 0.2－5.0 μmol·L-1 neostigmine or 1.0－4.0 mmol·L-1 3,4-DAP. In normal Tyrode solution, verapamil at a concentration of 1, 5, 10 or 20 μmol·L-1 had no significant effect on evoked endplate potentials and miniature endplate potentials. However, the sustained depolarization due to neostigmine or 3,4-DAP could be antagonized by verapamil at 5－20 μmol·L-1 and the duration of the depolarization was shortened in a concentration-dependent manner. CONCLUSIONL-type calcium ion channels can be activated by accumulated acetylcholine in the synaptic cleft and may be involved in producing sustained depolarization, while they play no role in transmitter release under normal physiological conditions.

Objective: In order to reveal the mechanisms of rh-endostatin and its suppression effect on HUVECs at different activating levels. Methods: Three types of HUVEC were prepared. We detected the ex-pression of CD105 and CD62E on the surface of adhering HUVEC, HUVEC of exponential phase of growth, and HUVEC activated with TNF-alpha. The effect of endostatin on these three types of HUVEC was indicated by the variation in the expression of CD105 and CD62E on the cells. The relationship of the changes in cell markers with the time and the concentration of endostatin was analyzed by SPSS 11.5. Results: The expres-sion of CD105 was correlated with time and dose of endostar in all groups. The expression of CD62E was cor-related with the dose of endostar in HUVEC treated with TNF-α for 24h. Conclusion: Endostatin of a certain dose can inhibit the activation of endothelial cells but it cannot induce cell apoptosis.

Objective To study the long-term effect of neoadjuvant chemotherapy on advanced breast cancer. Methods The CAF neoadjuvant chemotherapy 〔CTX 500 mg/m2(1st day, 8th day), 5-FU 500 mg/m2(1st day, 8th day), and ADM 30 mg/m2 (1st day) every 3 weeks〕 was carried out in 31 breast cancer patients (stageⅢ,Ⅳ) for 2 cycles before operation, compared with 30 patients (stage Ⅲa) whose therapies were never done and operations could be feasible. Results The overall response rate was 87.1%(27/31). The stages of 19 patients among 31 (61.3%) declined (6 patients to stage Ⅲa, 8 to stageⅡb, 4 to stageⅡa, 1 to stage 0, 1 to complete response and none to pathological complete response). The disease-free survival time of the patients was 56.3 months which was obviously longer than that of the patients without neoadjuvant chemotherapy (43.5 months, P

Objective To investigate the hemostatic function of biological glue in renal trauma.Methods Establishment of rab-bit kidney scratch,partial nephrectomy and renal injury penetrating wound models were available with a biological glue and hemo-static powder processing,observed and recorded the amount of bleeding and bleeding time.Tissue sample were transected from the wound of kidneys in each group after a month,and the renal wound healing condition was observed by pathological examination.Re-sults The hemostatic function of biological glue was better than styptic powder,the amount of bleeding in biological glue group and hemostatic powder group of kidney scratched model were(1.39±0.09)mL,(1.77±0.44)mL,the difference was not statistically significant(P =0.115);the bleeding time were(5.02 ±0.23)s,(66.40± 7.35)s,the difference was statistically significant(P <0.01);the amount of bleeding in two models of partial nephrectomy and renal penetrating wound were(2.07±0.25)mL,(11.42± 1.33)mL;(2.01 ± 0.36)mL,(3.95 ± 0.39)mL and bleeding time were(6.16 ± 0.69)s,(139.38 ± 8.97)s;(7.68 ± 0.80)s, (144.26±9.27)s,the differences were statistically significant(P <0.01).Pathology results showed that the wounds healed well. Conclusion The hemostatic function of biological glue in renal trauma were remarkable and stable,and was worth to be further promoted.

Objective The purification methods of the exosomes derived form T cells were established in order to get high quan-tity exosomes .Methods Exosomes from T cells culture supernatants were purified by ExoQuick Precipitation ,ultrafiltration and sucrose gradient centrifugation ,differential ultracentrifugation ,and confirmed via using transmission electron microscopy .The pro-tein expression of the exosomes were analyzed by SDS-PAGE electrophoresis .Western blotting was used to test the expression of IL-2 .Results The protein concentration of the exosomes purified through ExoQuick Precipitation ,ultrafiltration and sucrose gradi-ent centrifugation were higher than through differential ultracentrifugation (P<0 .05) .SDS-PAGE displayed the difference among the exosome purified by three methods .Three kinds of exosomes all expressed IL-2 .Conclusion ExoQuick Precipitation ,ultrafiltra-tion and sucrose gradient centrifugation technique can obtain high purity and complete exosome sample .

Objective To explore the feasibility of making cystoscope training model with rapid prototyping technology and its training method in cystoscope operation. Methods Constructed a cystoscope training model, and designed a set of corresponding training methods ac-cording to the process and behavioral essentials of cystoscope operation. Selected 20 students who have never learned cystoscope operation and trained them with the new designed cystoscope training mode and training methods, and the training results were verified. Results Compared before and after the training, the operation time of all the trainees were significantly shortened, and their operation steps and skills were more proficient. Conclusion Cystoscope training model can help beginners to grasp the theoretical basis of cystoscopy, operation steps, and behavioral essentials, so as to shorten the learning curve of the cystoscope operation.

Objective To evaluate the curative effect of transcatheter arterial chemoembolization (TACE)combined with Antike in the treatment of primary liver cancer. Methods The data of 72 patients with primary liver cancer(90 lesions in total)admitted to the First Affiliated Hospital of Hebei North University from August 2016 to December 2017 were retrospectively analyzed. All patients were divided into the observa-tion group(n = 36)and the control group(n = 36)according to the therapeutic schedule. The patients in the control group(40 foci)were treated with TACE only,and the patients in the observation group(50 foci)re-ceived TCAE treatment,oral Antike capsules were taken at the same time with the frequency of three times a day,two capsules each time,and six weeks were planned for one treatment cycle. A total of four cycles were completed. All patients underwent CT enhancement scans one week before TACE treatment and six months after treatment. According to Response Evaluation Criteria in Solid Tumors,complete remission and partial remission were deemed as effectivity. The imaging data of the change of tumor size,postoperative tumor residual,tumor capsule growth and new intrahepatic metastases were analyzed and used to evaluate the curative effect of patients in the two groups. Results After 6 months of treatment,there were 39 effective lesions in the observation group and 23 in the control group. The total effective rate of the observation group was higher than that of the control group(78. 0％ vs. 57. 5％ ),and the difference was statistically significant(χ2 = 4. 357,P = 0. 037). Twenty-three neoplastic capsule lesions were detected in the observation group and 9 in the control group. The detection rate of neoplastic capsule was higher in the observation group than that in the control group(46. 0％vs. 22. 5％ ),and the difference was statistically significant(χ2 = 5. 356,P = 0. 021). There were 27 residual tumors and 5 new intrahepatic metastases in the observation group,30 residual tumors and 13 new intrahepatic metastases in the control group. The residual tumor rate and neohepatic metastasis rate in the observation group were lower than those in the control group(54. 0％ vs. 75. 0％ ;13. 9％ vs. 36. 1％ ),and the differences were statistically significant(χ2 = 4. 220,P = 0. 040;χ2 = 4. 741,P = 0. 029). Conclusion TACE combined with Antike is safe and effective in the treatment of primary liver cancer. It can improve the total clinical effi-ciency,promote the growth of tumor capsule,and reduce the recurrence rate and metastasis rate of tumor. It is worthy of clinical application.

Objective After the islet transplantation,observed blood glucose and survival time in the islet transplantation mice model to explore the effect of intestinal epithelial γδT cell in islet transplantation rejection.Methods Established the mice model of islet transplantation,divided into wild type mice group,γδ gene knockout mice group and γδ gene knockout γδT cell reinfusion mice group,observed blood glucose in 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29 days after surgery and pathological conditions aft er two weeks of transplantation.Results After transplantation,the rising blood glucose of wild type mice group and γδ gene knockout γδT cell reinfusion mice group were significantly slower than that of γδ gene knockout mice group (P＜0.05),but there was no significant difference in between two groups (P＞0.05).The survival time of wild-type mice group was (27±2) days,and γδ gene knockout γδT cell reinfusion mice group was (24±1) days,they were significantly longer than (17±3) days of γδ gene knockout mice group (P＜ 0.05).Conclusion As a special kind of T cells,γδT intestinal epithelial cell plays an important role in the islet transplantation rejection.

A 62-year-old female patient was admitted to the hospital with a mass in the left kidney finding during medical check-up by color doppler imaging 1 day before admission. Unenhanced and contrast enhanced CT of urinary tract showed a mass on the inferior pole of left kidney. The left kidney cancer was diagnosed preoperatively and a left radical nephrectomy was performed laparoscopically. Postoperative diagnosis was thyroid-like follicular carcinoma of the left kidney and suspected derived from thyroid tumors by metastasis. Color doppler and CT examination of thyroid confirmed a mass in the right thyroid. Thyroid fine needle aspiration confirmed follicular carcinoma of the right thyroid, and follicular carcinoma of the right thyroid was diagnosed subsequently. The patient underwent radical resection of thyroid cancer according to the intraoperative frozen-section pathological results, and postoperative pathological diagnosis confirmed follicular carcinoma of the right thyroid and papillary carcinoma of the left thyroid. I 131 radio-iodine therapy and L-thyroxine tablets were administered based on the postoperative diagnosis of thyroid collision tumor. Seven months after surgery, the follow-up CT scan revealed no recurrence or metastases for renal area. Nine months later, no thyroid carcinoma recurrence was observed and no significant abnormality was detected in I 131 image. The composition of collision tumor is complicated and origin is unknown. Thyroid collision tumor with kidney metastasis is extremely rare, and the prognosis is better than primary renal carcinoma. The diagnosis depends on pathological examination.

【Objective】 To analyze the clinical data of prostate cancer patients with normal PSA level confirmed with transperineal prostate biopsy or transurethral prostate surgery, in order to improve the diagnostic level of this disease. 【Methods】 The clinical data of 6 patients were retrospectively analyzed. The age,clinical manifestations, body mass index (BMI),prostate specific antigen density (PSAD),blood triglycerides,blood cholesterol,color ultrasound imaging,magnetic resonance imaging (MRI),pathological types and Gleason scores were analyzed. The clinical characteristics and high-risk factors were summarized. 【Results】 Two cases were confirmed with prostate biopsy and four after prostate resection. Three patients had high blood triglycerides, three were negative for bone imaging, and the other three were not examined. PSAD was 0.017 to 1.215. Color ultrasound indicated that two cases had irregular morphology, two uneven echo, and one both irregular morphology and uneven echo; all six cases had calcification. In the three cases who received MRI, two had PIRADS4 nodules, one had PIRADS5 nodules, invasion of seminal vesicle, rectum, posterior wall of urinary bladder,bilateral thickening of NVB, and lymph nodes enlargement. Pathology suggested prostatic acinar adenocarcinoma in five cases, four of which had a Gleason score of 3+3=6 and one had 5+5=10; one case suggested a high-grade neuroendocrine carcinoma. 【Conclusion】 The clinical detection rate is low for prostate cancer with normal PSA. The biopsy indications should be determined by combining the characteristics and high-risk factors to improve the detection rate.