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Objective To investigate the effects and signal transduction pathway of vasonatrin peptide(VNP),a novel man-made natriuretic peptide,on hepatic fibrosis.Methods Mice were injec ted with carbon tetrachloride(CCl4)for 12 weeks,with or without VNP treatment in the last 6 weeks.HE staining and Sirius red staining were performed to evaluate the status of hepatic fibrosis.In vitro after treatment of VNP,and DNA and collagen synthesis of cultured HSC-T6 hepatic stellate cells were assessed by[3H]-thymidine and[3H]proline incorporation,respectively.The signaling pathway involved was identified by radioimmunoassay to detect the levels of intracellular cGMP,and by mimicking experiments using 8-br-cGMP(a membrane-permeable cGMP analog).Blocking experi ments were performed using HS-142-1,an antagonist of guanylyl cyclase-coupled natriuretic peptide receptor(NPR),or KT-5823,the cGMP-dependent protein kinase(PKG)inhibitor.Results VNP markedly alleviated CCl4-induced liver fibrosis in mice.In vitro,HSC-T6 cells demonstrated a dosedependent reduction of DNA and collagen synthesis in the presence of VNP.In addition,VNP significantly increased intracellular levels of cGMP.The effects of VNP were mimicked by 8-br-cGMP,but they were inhibited by HS-142-1,or KT-5823.Conclusion VNP ameliorated liver fibrosis by inhibiting collagen production from hepatic stellate cells via guanylyl cyclase-coupled NPR/cGMP/PKG signal pathway,indicating that VNP might be a new effective agent in the treatment of liver fibrosis.
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Objective To study the method, advantage and shortcoming of mini-laparoscopic treatment for indirect inguinal hemia in children. Methods 136 cases with indirect inguinal hernia(right:75cases,left:44 cases,bilateral:17 cases) had been treated by high ligation with mini-laparoscopy. Results The mean operation time was 10 mmin for unilateral hernia and 23 mmin for bilateral hernia. Among 119 cases with unilateral hernia,38 cases had been found with contralateral latent hernia. The mean of postoperative inhospital stay were about 1 ～ 2 day(s). All patients had been followed-up for 3 ～ 12 months,there were only 2 cases recurrence found but no complications was detected.Conclusion Mini-laparoscopic high ligation for indirect inguinal hernia in children is a single, safe, satisfactory, effective,and minimally invasive surgical method.
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Objective To report our experience on closure of patent arterial duct using Hem-o-lok polymer ligating clip under a direct vision.Methods From May 2001 to May 2007,84 patients with cast patent arterial duct were treated with Hem-o-lok polymer ligating clips.Under a direct vision,the clips were placed to close the patent arterial duct through a small left subaxillary incision.Results The mean operation time was 42 minutes(ranged from 30 to 60).No intraoperative bleeding occurred in this series.After the operation,heart murmur disappeared in all the patients and none of them died.They were followed up for 2 to 50 months(mean 28 months),during which no residual shunting or recanalization occurred.Conclusion It is microinvasive and safe to close patent arterial duct by using Hem-o-lok polymer ligating clip.
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Objective In order to solve the scaffold material and the cell source of the tissue engineering bile duct.This experiment was divided into two parts: ⑴To cultivate the vascular smooth muscle cell(VSMCs)in vitro and observe the cultivate status of the VSMCs in 3D environment of polylatic acid-polynlycolic acid(PLGA).⑵To explore the feasibility of differentiation of rat bone marrow stromal cells towards liver stem cells in vitro.Method ⑴To cultivate the VSMCs with PLGA(the film material with 3D material) after they were successfully cultivated,and to observe the cell growth status by inverted microscope,scanning electron microscope and MTT.⑵To culture rBMSCs in vitro by culturing the full bone marrow stem cells in a system containing hepatocte growth factor(HGF).The morphology of the cells was observed by inverted microscope,and the expressions of albumin,AFP were detected with ELISA and immunohistochemistry technique.Result ⑴The VSMCs growth is prosperous in vitro with good compatibility with PLGA.⑵After being cultured with HGF,the rBMSCs showed multilateral and ovary tansformation.The differentiated cells expressed albumin and AFP.Conclusion ⑴The VSMCs were successfully cultivated and purified in vitro and have good compatibility with PLGA.⑵ The rBMSCs have the ability to-differentiate into liver stem cells in vitro.The current studies provide the experimental basis for rBMSCs to differentiate into endothelial cells of the bile duct.