BACKGROUND:Although drug treatment.physics-behavior therapy,and postoperative therapy have been commonly used to treat stress urinary incontinence(SUI),there is still no satisfactory treatment at present.OBJECTlVE:To build a stable animal model simulating stress urinary incontinence(SUI)by bilateral transaction of pudendal nerve and nerves innervating pelvic floor muscles,including iliococcygeous muscle and pubococcygeous muscle.METHODS:A total of 18 6-week-old female SD rats weighing(1 99.44±8.41)g were randomly divided into 3 groups:normal,model,and sham-surgery groups,with 6 rats in each group.Rats in the model group underwent bilateral transaction of pudendal nerves and nerves innervating iliococcygeous/pubococcygeous muscles,while rats in the sham-surgery group had same procedures except nerve transaction.The normal group did not undergo any operation.Each rat was subjected to measure leak point pressure(LPP)at 2 weeks after the operation.After the measurement of LPP,cross sections of connection area of bladder and urethra were sent to histology.RESULTS AND CONCLUSION:One rat in the sham-surgery group died at 1 week after the operation.The LPP of model group decreased significantly by approximately 33%compared with the normal group(P＜0 05):however,there was no significant difference in LPP between sham-surgery and normal groups(P＞0.05).The results of histology showed loosely arrangement and atrophy of urethral sttriated muscle fibers in rats of the model group.Bilateral transaction of pudendal nerves and nerves innervating to iliococcygeous/pubococcygeous muscles resulted in SUI in rats stably.

Objective To investigate the difference of standard tangential field and multiple fileld radiotherapy in axillary lymph node after conserving surgery,to provide a reference for clinical treatment.Methods 20 cases of left breast cancer patients were selected,all patients underwent breast -conserving surgery,postoperative radiothera-py.All patients used standard radiotherapy wild tangent based and reverse -intensity modulated radiation therapy optimization.Armpit I,Ⅱ lymph nodes were used to calculate the extent of coverage of the original plan,target dose uniformity HI,dose conformal CI,dosimetric parameters were calculated.Results Under standard tangential field irradiation,I stand mean dose was (33.95 ±8.24)Gy,which was significantly higher than Ⅱ station (22.13 ± 6.67)Gy,and V50,V45,V40 were (22.45 ±6.32)%,(39.83 ±7.54)%,(49.65 ±8.31)%,which were higher than Ⅱ stand,I stand irradiation was significantly more,the differences were statistically significant (t =5.632,P =0.009;t =7.214,P =0.000;t =8.954,P =0.000;t =6.121,P =0.002).The whole breast irradiation armpit IMRT plan,19 patients (95.00%)reached 95% by volume APTV≥50Gy,coverage was better;but HI,CI were (1.11 ± 0.03),(1.36 ±0.07)respectively,which were significantly worse than the standard wild tangent,the differences were statistically significant (t =6.584,P =0.001;t =9.144,P =0.000).Under Hatano IMRT irradiation ipsilateral lung,heart suffered an average dose of (1 694.58 ±102.31)cGy,(645.54 ±74.44)cGy,which were significantly more than the standard tangential field irradiation,the differences were statistically significant (t =7.654,P =0.000;t =6.654,P =0.001).Conclusion Standard tangential field irradiation has poor coverage in Ⅱ axillary lymph node station,irradiation intensity modulated radiation has better coverage,but significantly increased the dose to normal tissues.

BACKGROUND:Titanium and titanium aloy are used mostly in artificial joints, fracture fixation, and oral transplantation, while there are complex cases of insufficient bone mass in these areas. The deepened research of stem cels offers a solution for bone injury to promote new bone formation. The biocompatibility of titanium and stem cels and optimization of titanium surface modification have aroused people's attention. OBJECTIVE:To investigate whether the biocompatibility of titanium and human adipose-derived mesenchymal stem cels can be improved by type I colagen modification of titanium sheets. METHODS:The experiment was divided into two groups. Modification group: titanium sheet was modified with type I colagen; control group: titanium sheet was not modified with type I colagen. Human adipose-derived mesenchymal stem cels at passage 6 were implanted into titanium sheet in two groups. Then we calculated the number of adherent cels in two groups at 1, 2 and 4 hours after implantation, and compared the celladhesion rate. MTT assay was used to observe the proliferation of cels on titanium sheet at 2, 4, 6 and 8 days after implantation. DNA and protein content of cels were detected at 3, 6, 9 days after implantation. The growth of human adipose-derived mesenchymal stem cels seeded upon the titanium sheets was observed under scanning electron microscope at 6 days. RESULTS AND CONCLUSION:When the cels were cultured for 1 hour and 2 hours, the number of adherent cels in the modification group was higher than in the control group (P < 0.05). The absorbance of cels in two groups was increased as the culture time, as detected by MTT assay. The modification group had a significantly higher absorbance value than the control group at 4, 6, 8 days (P < 0.05). DNA and protein contents of the cels in the modification group were higher than that in control group at 6 and 9 days (P < 0.05). At 6 days, the number of adherent cels and secretion of adherent stromal cellmatrix in the modification group were significantly better than that in control group, observed by scanning electron microscopy. Type I colagen modified titanium sheets have good surface activity and biocompatibility, and can promote the proliferation of human adipose-derived mesenchymal stem cels.

ObjectiveTo explore the effects of myoblast formation around the urethra of stress urinary incontinence (SUI) rats after treated with bone marrow mesenchymal stem cells(BMSCs) or musclelike cells/calcium alginate composite gel injection therapy.MethodsIsolation,cultivation and identification of Sprague-Dawley rat bone marrow mesenchymal stem cell were performed.5-azacytidine was introduced to induce muscle-like cells.Calcium alginate gel was initially prepared by 2％ sodium alginate and 1％ calcium chloride solution at a volume ratio of 5∶1.Compounds of stem cells or muscle-like cells were mixed with gel,respectively,and were prepared for microinjection.SUI was produced in 72 6-week-old female Sprague-Dawley rats.The rats were then divided into 4 groups:Gel group,stem cell-gel group,muscle-like cell-gel group and mock control group.Each group was further divided into 3 groups.Submucosal injection of gel was performed at urethra and bladder neck.After preparation of cross sections of rat urinary tract at 4 weeks and 8 weeks after injection,HE staining,fluorescent tracing,staining of Desmin and α-skeletal muscle actin (α-SMA) were performed.OD values of positive rates were compared.ResultsAt 4 weeks and 8 weeks after injection in stem cell-gel group and muscle-like cell-gel group,growth of blood vessels gradually increased at gel edge,BMSCs and muscle-like cells gathered around the new blood vessels observed by fl(u)orescence tracer,muscle-like cells grew into elongated spindle-like cells.Desmin and α-SMA staining were positive in these groups,and the OD values in the stem cell-gel group and muscle-like cell-gel group was significantly higher than that from the gel only group and control group,but no difference was found between stem cell-gel group and muscle-like cell-gel group.ConclusionsCompound of BMSCs,muscle-like cells and calcium alginate composite gel has the potential to differentiate into muscle cells in the microenvironment of SUI rat model.In short term,the myoblast formation potential is the same whether the BMSCs was introduced into the micro-environment in vivo directly,or the BMSCs was implanted into microenvironment after the formation of the muscles cells induced by 5-azacytidine in vitro.