Objective To inquire into T-type calcium channel effects on atrial electrical remodelling and its mechanisms during atrial fibrillation.Methods Animal experiment was performed in Peking University Pepole's Hospital from Feb.2002 to Oct.2006.Fifteen adult cross-bred dogs were used in the experiment.Ten dogs underwent continuous rapid atrial pacing(500 beats/min)for twenty-four weeks to create persistent atrial fibrillation.In five rapidly-paced dogs,50mg pure powder/day of mibefradil dihydrochloride was given from the second day after pacemaker implantation and continued until the twenty-fourth week.A group of size-matched dogs(n=5)without being given mibefradil was used as a pure atrial fibrillation group.Another group of size-matched dogs(n=5)without pacemaker implantation was used as a control group.Atrial fibrillation duration was determined by electrophysiological study.Canine atrial myocytes were isolated by enzymatic dissociation and intracellular Ca2+ cytosolic transient was studied with confocal imaging.Results (1)The preoperation atrial effective refractory period was 280/90~110 ms.In the twenty-fourth week after rapid atrial pacing,atrial effective refractory period was obviously extended(2000/1400~1700 ms)in the T-type Ca2+ channel blocker group compared with the preoperation one.In the twenty-fourth week,the induced rate of persistent atrial fibrillation was 75% in atrial fibrillation group,whereas the persistent atrial fibrillation occurred in only one case(20%)in the T-type Ca2+ channel blocker group.(2)Intracellular Ca2+ concentration of atrial myocytes was unremarkably changed in control group after blocking L-type Ca2+ channel(1.17?0.09 OD ratio),whereas the intracellular Ca2+ concentration was obviously enhanced(2.35?1.05 OD ratio)(P

Objective To evaluate the short-term effects of three-dimensional conformal radiotherapy (3D-CRT) associated with transcatheter arterial chemoembolization (TACE) in the treatment of primary hepatic carcinoma and 3D-CRT associated with chemotherapy in the treatment of metastatic hepatic carcinoma. Methods In 52 patients with primary hepatic carcinoma, first of all a single TACE was conducted. Then after an interval of 2 weeks, the conformal radiotherapy was given, with a radiation dose of 2~3 Gy every fraction, once daily or once every other day and 3~5 fractions every week. The total radiation dose to the target was 42.2~60.0 Gy (mean, 52.2 Gy). Afterwards, 2 additional TACEs were given after the radiotherapy. In 35 patients with metastatic hepatic carcinoma, chemotherapy was carried out for 1 treatment course firstly. Then 3D-CRT was employed. After the radiotherapy, another 2 courses of consolidating chemotherapy were administrated. The patient continued with the chemotherapy for additional 3 treatment courses (a total of 6 courses) if efficacy evaluation showed the patient had responded to the chemotherapy. Results The response outcomes were: complete remission (CR) 23 0% (20/87), partial remission (PR) 39 1% (34/87), stable disease (SD) 34 5% (30/87) and progressive disease (PD) 3 4% (3/87), the response rate (RR) being 62 1% (54/87). Conclusions 3D-CRT with TACE for primary hepatic carcinoma and 3D-CRT with chemotherapy for metastatic hepatic carcinoma offers high local control rates and good short-term effects.

AIM: To study the effect of proliferating cell nucler antigen antisense oligonucleotide on ex vivo expansion of cord blood CD34~+ hematopoietic stem/progenitor cells.METHODS: CD34~+ cells were purified from fresh cord blood by immunomagnetic beads.CD34~+ cells were incubated in liquid culture system with different concentrations of(PCNA-ASODN).Using flow cytometry,the number of different kinds of stem/progenitor cells and PCNA expression were measured after CD34~+ cell incubation.RESULTS: PCNA was lowly expressed in low experiential group,with a positive rate of(27.2?3.6)% and(19.0?1.5)%,the positive rate of control group was(53.8?8.3)%(P

Background Diabetic retinopathy (DR) is a common ocular complication of diabetes,and its pathogenesis is associated with a variety of factors.c-Jun N terminal kinase (JNK),one of the genes involving in apoptosis,plays an important role in the pathology of diabetes,and relative research is catching increasing interests in recent years.Objective This study was to quantify the expression of JNK3 in retinas of DR murine.Methods Forty-eight SPF male C57BL/6 mice were randomly divided into the diabetes group and the normal control group.Diabetic mouse models were establishend by intraperitoneal injection of 1％ streptozocin (STZ) dissolved by sodium citrate buffer,and equvilant volume of sodium citrate buffer was used in the same way in the mice of the control mice.The left eyeballs were obtained 2,4,8 weeks after modeling and the retinas were collected.Real-time quantitaive PCR was perfored to detect the expression of JNK3 mRNA in retinas.The use and care of the experimental mice complied with the Administration of Experimental Animals in Kunming Medical College.Results Blood glucose levels were significantly higher in 2,4,8 weeks after modeling in the diabetic group compared with the normal control group (t=-5.675,-5.498,-5.347,all at P＜0.01).The relative expression levels of JNK3 mRNA (A value) in the retinas were significantly different between the groups at various time points (Fgroup =102.345,P＜0.05 ; Ftime =131.679,P＜ 0.05).The relative expression levels of JNK3 mRNA in the retinas were 3.21 ±0.14 and 5.43 ±O.37 in 4 and 8 weeks after modeling in the diabetic group,which were significantly elevated in comparison with the normal control group (2.54±0.42 versus 2.26±0.67) (t =4.073,23.399,both at P＜0.05).Compared with the second week and fourth week,the relative expression levels of JNK3 mRNA in the retinas in the eighth week were significantly raised in the diabetic group (t =10.756,16.857,both at P ＜ 0.05).Conclusions JNK3 expression in the retina upregulates in diabtic mice in a time-dependent manner.JNK3 is paopably involved in the pathogenesis and development of DR.

Objective To develop an apparatus to measure pulse magnetic field. Methods Single chip computer and Hall-effect integrated circuit was utilized to measure the magnetic induction. The correlative hardware and software flow were given. The measuring range of apparatus was 0-50mT. Results The circuit was simple and the performance was safe and credible. The measuring precision was high. Conclusion It can be used for some kinds of magnetic induction measurement.

Horseradish peroxidase (HRP) was injected unilaterally or bilaterally into the cerebellum of 11 rabbits in order to trace the distribution of labeled neurons in the whole length of the spinal cord. To investigate the ascending side of the axons, hemisections were made unilaterally in the lower thoracic cord of 4 rabbits before injection. The distribution of labeled spinocerebellar tract neurons was rather wide. Neurons in the cervical segments were located in (1) the central cervical nucleus (CCN) in Q_(1-4), (2) the medial part of lamina VI in C_2-T_1, (3) the central part of lamina VII in C_(4-8) and (4) lamina IV-V in C_(5-8). The labeled neurons located in segments caudal to thoracic cord could be divided into two groups. Neurons of the uncrossed tract were located in (1) Clarke's column in T_2-L_4, (2) laminae IV-VI in T_2-L_6. Neurons of the crossed tract were found in (1) the spinal border cells (SBC)in L_(3-6), (2) the medial part of the lamina VII in segments caudal to L_6, (3) lamina V in the sacrococcygeal cord and (4) laminae VII-VIII in the sacrococcygeal cord. The present study suggests that the location and fiber course of the spinocerebellar neurons in the rabbit are quite the same as those in the cat. These results should form a basis for further anatomical and physiological studies of spinocerebellar system in the rabbit.

To explore the nyopic shift after cataract extrac tion(ECCE ) with intraocular lens implantation (IOL． ) during childhood．2l children (24 eyes) with ECCE+0L are retrospectively analyzed,and were divided into two groups according to the age． The initial and last postoperative refractive errors were compared． The mean myopic shift was -0.89±0.40 (3～5 years group ) and -0.97± 0.l8 (6～ l0 years N) The difference between two groups was not significantly different(t=0.2l, P>0.05 ) ．The myopic shift was less than l.5re in 91.6W of the w． 83.32 of the eyes achieved a visual acuity of 0.5 or better in their pseudosphakic eyes． Undercorrecting most children 3 to 10 years of ag e by 1.00D from the IOL power predicted to achieve emmtropia．

Objective To evaluate the difference of tracheobronchial stenosis and airway malformation between double aortic arches and pulmonary artery sling in children. Methods Clinical feature and imaging data of spiral CT were retrospectively analyzed in children with double aortic arches or pulmonary artery sling who was hospitalized from July 2010 to July 2015 . Results There were 16 children ( 11 males and 5 females) with double aortic arches whose median age at onset was 3 . 5 months old. There were 47 children ( 28 males and 19 females) with pulmonary artery sling whose median age at onset was 4-month-old. In these 16 cases of double aortic arches, 14 cases were coupled with tracheobronchial stenosis. Two cases had more than one segment involved and they were segments II or III. Twelve cases had only one segment involved. Different degrees of tracheobronchial stenosis occurred in 47 cases of pulmonary artery sling, among whom 27 cases had more than one segment involved and the common segment was II and III ( 19 cases). Two cases had four segments involved and 20 cases had only one segment involved. There was statistical signiifcance in the number of involved segments between children with double aortic arches and pulmonary artery sling (χ2=13 . 588 , P=0 . 001 ). In 16 cases of double aortic arches, one case was combined with tracheal bronchus, and 1 case was combined with pulmonary hypoplasia. In 47 cases of pulmonary artery sling, 8 cases were combined with bridging bronchus, 3 cases combined with tracheal bronchus, 3 cases combined with pulmonary hypoplasia, 5 cases combined with bronchial deifciency or tracheal diverticula, and 2 cases combined with bronchopulmonary foregut malformation. There was statistical signiifcance in the number of cases combined with airway malformation between children with double aortic arches or pulmonary artery sling (χ2=5 . 333 , P=0 . 021 ). Conclusions The tracheobronchial stenosis and pulmonary airway abnormalities are more prominent in children with pulmonary artery sling than those in children with double aortic arch.

Objective To observe the effects of Compound Uncaria Hypotensive Tablets on expressions of MCP-1 and MMP-9 of vascular remodeling in spontaneously hypertensive rats (SHR); To discuss it possible mechanism of action. Methods Totally 24 12-week old male SHR were randomly divided into SHR model group, Compound Uncaria Hypotensive Tablets group, and positive medicine group, with 8 rats in each group. Another 8 WKY rats were set as normal control group. Medication groups were given relevant medicine for gavage for successive 6 weeks. Noninvasive tail cuff method was used to observe blood pressure; morphological changes in thoracic aorta and renal artery were observed by HE staining; immunohistochemistry was used to detect the protein expressions of MCP-1 and MMP-9 in thoracic aortic wall. Results Protein expressions of MCP-1 and MMP-9 in thoracic aortic wall of SHR model group were significantly higher than those of normal control group (P<0.01); Compared with the SHR model group, protein expressions of MCP-1 and MMP-9 in thoracic aortic wall decreased significantly in the medication groups (P<0.05, P<0.01); Compared the Compound Uncaria Hypotensive Tablets group and positive medicine group, there was no obvious difference in protein expressions of MCP-1 and MMP-9 in thoracic aortic wall. Conclusion Compound Uncaria Hypotensive Tablets can reduce the blood pressure of SHR, reduce inflammation reaction, and regulate vascular remodeling, which mechanism may be related to down-regulation of expressions of MCP-1 and MMP-9 in SHR aortic endothelial cells.

Objective To explore the adjustment of interleukin II combining lifein for CD+4 T lymphocyte, Th1 and Th2 of patients with malignant tumor. Methods CD+4 T lymphocyte were measured by flow cytometer. Th1 lymphocyte and Th2 lymphocyte were measured by ELISA. Thirty- eight patients with malignant tumor were enrolled in the study. Interleukin II were administered at the dose of 500 000 U, i.h Qd, from day 1 to day 5. Lifein were administered at the dose of 10mg/d, i.m Qd, from day 6 to day 21 or form day 6 to day 27. The count of CD+4 T lymphocyte, Th1 lymphocyte and Th2 lymphocyte were studied before treatment, 2 weeks and 1 month after treatment. Conduct ANOYA using SPSS software. Results The expression of CD+4 T lymphocyte in patients as with increase tendency. The counts of Th1 lymphocyte, Th2 lymphocyte and Th1/Th2 were not significantly different after treatment. Conclusions The dose of this treatment could enhance the count of CD+4 T, but it could not adjust the count of Th1 lymphocyte, Th2 lymphocyte. The target of treatment about interleukin II combining lifein for patients with malignant tumor is CD+4 T lymphocyte's other subsets.