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BACKGROUND: Organ for transplantation is insufficient, and primary transplant of nonfunction caused by perfusion cryopreservation occasionally occurs. It is clinically significant to reduce organ damage caused by perfusion preservation. OBJECTIVE: To explore the protective effect of hyperoxic perfusion fluid on liver transplantation in rats. METHODS: A total of 40 Wistar rats were randomly divided two groups (n = 20) and respectively poured with Ringer lactate solution or hyperoxic ringer lactate solution. Each group comprised equal number of donors and recipients to prepare liver, kidney, and pancreas transplantation models. Hyaluronic acid (HA), alanine aminotransferase (ALT) and CD8+CD28- T cells were compared between two groups at the end of perfusion, and 1st and 3rd days after liver transplantation. The acute rejection score of liver tissues were also compared after operation. RESULTS AND CONCLUSION: The HA, ALT and CD8+CD28-T cells were no significantly different between two groups before operation (P> 0.05). The HA and ALT of hyperoxic ringer lactate solution group was significantly Ringer lactate solution group after liver transplant (P < 0.05), but the CD8+CD28-T cells were greater (P < 0.05). The acute rejection scores for liver in hyperoxia liquid group were significantly less than the common liquid group (P< 0.05). Results show that hyperoxic solution can attenuate ischemia/reperfusion injury and protect rats undergoing liver transplantation.
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AIM: To investigate the effects of early application of thymosin peptide alpha 1 on lymphocyte subsets after operation in patients with hepatocellular carcinoma. METHODS: Forty-six patients with hepatocellular carcinoma were randomly divided into control and treatment groups for this study. Thymosin α1 at dose of 1.6 mg was injected subcutaneously on day 1, 3, and 5 after operation in treatment group. The percentages of CD3+, CD4+ and CD8+ cells, and CD4+/CD8+ ratio in both groups were counted before operation and on day 1, 4, and 7 after hepatectomy. RESULTS: CD4+ cell population and CD4+/CD8+ ratio decreased, but CD8+ increased after operation in control group (P<0 05). In thymosin peptide alpha 1 treatment group, there was no statistical difference in the percentages of CD3+, CD4+, CD8+, and CD4+/CD8+ before and after operation. In addition, thymosin α1 significantly increased CD4+ cell population and CD4+/CD8+ ratio (P<0 05). CONCLUSION: Operation suppresses the immune function in patients with hepatocellular carcinoma. Thymosin α1 increases CD4+ T lymphocyte subsets in patients after operation.
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BACKGROUND: Under the cellular physiological condition, 15.3% N-acetylated chitosan has poor solubility which limits cellular microencapsulation process.OBJECTIVE: This study was designed to prepare 50% N-acetylated chitosan with 15.3% N-acetylated chitosan and investigate its feasibility for preparing chitosan microcapsule used for hepatocyte embedding after in conjunction with methacrylic acid-hydroxyethyl methacrylate-methyl methacrylate (MAA-HEMA-MMA) copolymer under the cellular physiological condition.DESIGN, TIME AND SETTING: This study, a control observation experiment, was performed at the Central Laboratory, First Hospital Affiliated to Jinan University, Guagnzhou, Guangdong Province, China between January and October 2006.MATERIALS: 15.3% N-acetylated chitosan was provided by Sigma-Aldrich Company, Singapore. Hepatocytes were acquired from male Wistar rats, weighing 250-300g, by two-step collagenase digestion method.METHODS: Hepatocytes were microencapsulated using 50% N-acetylated chitosan and MAA-HEMA-MMA copolymer at 25℃ under aseptic condition.MAIN OUTCOME MEASURES: Microcapsule permeability was expressed with the diffusion degree of fluorescein isothiocyanate (FITC)-dextran in the empty microcapsule. The homeostasis of microencapsulated hepatocytes was measured by mechanical shearing-crush tests. The albumin-synthesizing capability of microencapsulated hepatocytes was determined by enzyme-labeled immunosorbent assay (ELISA). Urea-synthesizing capability was tested using kits (Sigma Diagnostics, USA) at the wavelength of 540 nm by colorimetric assay. Cytochrome P450 activity was determined using confocal laser microscopes and quantitated by the fluorescence intensity of products of 0-dealkylated 7-ethoxy resorufin, a substrate of cytochrome P450IA1. The plate-cultured hepatocytes were taken as controls.RESULTS: With increasing mass concentration of 50% N-acetylated chitosan, the diffusion degree of Mr 20000 and Mr 40000 FITC-dextran presented with a decreasing tendency, while the diffusion degree of Mr 70000 FITC-dextran was low and did not alter markedly. When the microencapsulated hepatocyte density was 2×109 L-1, the broken rate of microcapsule was only about 6% after 24 hours of shaking. Under the same condition of shaking, empty microcapsules were all broken after 4 hours of shaking. After 1 day of culture, approximately 30μmol/d urea could be synthesized among 1×106 bepatocytes that was markedly higher than the plate culture experimental result, 15μmol/d. After 7 days of culture, urea-synthesizing capability was close between in the microencapsulated hepatocytes and in the plate cultured hepatocytes. In the first 3 days of culture, 10μg/d albumin was acquired from 1×106 hepatocytes, and after 7 days of culture, only about 5μg/d albumin was obtained. The albumin level in the whole culture process was higher than plate culture results. After 1 day of culture, cytochrome P450 activity in the microencapsulated hepatocytes was higher approximately 8 times compared to plate culture results. After 1 week of culture, cytochrome P450 activity still retained at 50% of 1-day culture level.CONCLUSION: Microcapsule prepared by 50% N-acetylated chitosan under the physiological condition has good permeability and structural stability during the process of culture. Compared with in vivo surface culture test, degenerated chitosan microcapsule is better favorable to in vitro function of hepatocytes.
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AIM: To evaluate the effects of hyperthermic peritoneal chemiotherapy (HPC) on cardiovascular system. METHODS: Twenty-six patients whose age was 31 to 75 receiving gastric cancer radical resection followed by HPC were involved in this trial. All hemodynamic parameters were recorded during whole procedures. RESULTS: The blood temperature(T) increased significantly during HPC; cardiac index increased immediately when HPC began( P
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Objective To evaluate the effect and mechanism of non-steroidal anti-flammatory drags(NSAIDs) on the colon cancer cell growth by using S-nitrosoglutathione(GSNO) which can produce nitric oxide.(Methods) Apoptosis of 3 colon cell lines were evaluated by cell growth curve and flow cytometry,the PGE_2 levels in cell culture supernatants were determined by competitive enzyme immunoassay method,and the(protein) expression of COX-1 and COX-2 were analyzed by Western blot.Results The production level of PGE_2 was increased with CSNO treated concentration and time.Using 500?mol/L CSNO treatment for 48h,the expression level of COX-1 and COX-2 protein increased.NASIDs can block the production of PGE_2 but had no effect on the inhibition of cell growth induced by GSNO.Conclusions GSNO can increase PGE_2(production) and induce COX-1 and COX-2 protein expression in a dose-and time-dependent manner.Higher concentrations of GSNO also can inhibite cell growth and induced apoptosis in all 3 cell lines.NSAIDs can block production of PEG2 but NSAIDs are no effect on cell growth.