Objective To observe the degradation of the polyactic glycolate acid (PLGA) microparticles with releasing-slowly vascular endothelial growth factor(VEGF) synthesized by the method of emulsification-diffusion. Methods The method of emulsification-diffusion is to incorporate VEGF into microparticles composed of biodegradable PLGA. The controlled release of microparticles are acquired. The content of the VEGF released slowly from PLGA microparticles in vitro was detected with ELISA at different time. Results We synthesized 100 releasing-slowly VEGF PLGA microparticles with the size of 0.20-0.33 μm by 5 times. The contents were 62±11 ng/L, 89±14 ng/L, and 127±19 ng/L in the 1st, the 2nd and the 3rd months after degradation, respectively. Conclusion The PLGAmicroparticles with releasing-slowly VEGF can be synthesized by the method of emulsification-diffusion.
目的 應用聯合微創介入方法治療中晚期肝癌并探討其療效。方法 我院自1998年4月至2008年11月期間采用聯合介入治療的方法，即行經皮股動脈插管肝動脈化療栓塞術，同期行B超引導下經皮穿刺瘤內乙醇注射(PEI)治療中晚期肝癌175例。結果 左肝動脈行肝動脈化療栓塞7例，右肝動脈行125例，單行化療而未栓塞43例； 175例均行B超引導下PEI。隨訪6～28個月，平均19.3個月，死亡15例，其中8例死于肝功能衰竭，7例死于上消化道大出血伴肝癌廣泛轉移。29例存活6～12個月； 146例存活13～28個月，其中27例存活已超過26個月。結論 對于不能切除的中晚期肝癌采用聯合介入治療，因其具有操作簡單、療效可靠、經濟、安全等優點，值得臨床推廣應用。
【摘要】 目的 建立血液中乙醇的直接稀釋-填充柱氣相色譜測定法，將其與現行推薦方法GA/T105-1995進行對比，同時對不同采血管對乙醇含量的影響進行研究。 方法 使用GDX-102填充柱作為分析柱，柱溫160 ℃，汽化室190 ℃，檢測器（FID）190 ℃；用1 mg/mL正丙醇溶液稀釋血液50倍，經離心后，取上清液1 μL進樣測定。 結果 本法回收率91.2%~105.7%，與GA/T105-1995推薦方法測定結果最大相對誤差為7.1%，血液保存于非抗凝管的血醇濃度比抗凝管稍高。 結論 該法適用于血液中乙醇含量的測定，樣品處理更簡便。不同采血管對血醇含量有一定影響，綜合考慮各因素后建議使用枸櫞酸鈉抗凝管作為采血管。【Abstract】 Objective To establish a direct dilution-gas chromatographic method for the determination of ethanol in blood, compare the method with GA/T105-1995 recommendation method, and study the effects of blood tubes with different anticoagulants on the ethanol contents. Methods GDX-102 packed column was used as separation column with an oven temperature of 160 ℃, an injector temperature of 190 ℃ and a flame ionization detector temperature of 190 ℃. Normal propanol solution at 1 mg/mL was adopted to dilute the samples with a volume 50 times of the propanol solution. After being centrifuged, 1ul of the supernatant liquid was injected for analysis. Results The recovery rate of the method was between 91.2% and 105.7%. The deviation of the method with GA/T105-1995 recommendation method was less than 7.1%. The concentration of blood ethanol preserved in the non-anticoagulant tubes was a little higher than that preserved in the anticoagulant tubes. Conclusions The method can be used for the determination of ethanol content in blood. Compared with GA/T105-1995 recommendation method, the sample treatment of this method is much simpler. And the blood tubes with different anticoagulants have influences on the ethanol contents. It is recommended that blood tubes with sodium citrate as anticoagulant can be used for blood sampling and preservers.
Objective To study the efficiency of percutaneous acetic acid injection (PAI) or percutaneous ethanol injection (PEI) in the treatment of primary hepatic carcinoma (PHC). Methods Seventeen and 24 patients with PHC were treated, respectively by PAI or by PEI in our hospital. According to hepatic function test, soluble intereukin-2 receptor (sIL-2R), AFP, biopsy and size of tumor, the evaluation was made.Results Effective rate was 88.2% in PAI group and 87.5% in PEI group, respectively. There was no obvious influence to sIL-2R in serum in the two groups (Ｐ＞0.05). Obvious differences in impairment of hepatic functions between PAI and PEI groups were found (Ｐ＜0.01), it also showed that smaller amounts of acetic acid and less puncture frequency were required for the treatment than that of ethanol. Conclusion PAI is superior to PEI in the treatment of those patients who are complicated with cirrhosis or other vital disease.
Objective To investigate the effect of chaiqin chengqi decoction (CQCQD) on serum lipid metabolism in experimental acute pancreatitis. Methods A total of 27 C57BL/6 mice were randomly divided into three groups (n=9 for each group). The mice in the acute pancreatitis model group (AP group) and the acute pancreatitis model + CQCQD treatment group (APQ group) received seven intraperitoneal injections of cerulein (50 μg/kg) at hourly intervals, while the mice in the control group (CON group) received phosphate-buffered saline injections at the same regimen of cerulein. Oral gavage of CQCQD (5.5 g/kg) or same volume of distilled water was commenced 1 h after the first cerulein injection for three times at intervals of 4 h for the APQ group and AP group, respectively. Animals were sacrificed 12 h after the first cerulein / phosphate-buffered saline injection for collecting serum and tissue samples. The levels of serum lipase and amylase, pancreatic histopathology assessment, as well as pancreatic myeloperoxidase activity, were used to assess the severity of acute pancreatitis and the efficacy of CQCQD. Additionally, serum lipid metabolites were analyzed in all groups. Results In comparison to the CON group, the mice in the AP group exhibited significant edema, inflammatory cell infiltration, necrosis of pancreatic tissues, as well as elevated levels of serum amylase, lipase, and pancreatic myeloperoxidase activity (P<0.05); in comparison to the AP group, inflammatory cell infiltration and necrosis of pancreatic tissue, as well as elevated level of serum amylase significantly reduced in the APQ group (P<0.05). A total of 319 lipid molecules were identified in serum, and 13 lipid metabolites were significantly increased in the AP group and successfully decreased in the APQ group, of which 9 were lyso-phosphatidylethanolamine (LPE) molecules involved in the glycerol phospholipid metabolic pathway. Further statistical analysis revealed that six of these LPE molecules could serve as potential biomarkers. Conclusions CQCQD ameliorated pancreatic injury and serum lipid metabolism disorder of acute pancreatitis model induced by cerulein and significantly improved the abnormal increase of serum LPE level. However, the role of LPE in acute pancreatitis and the underlying mechanisms of CQCQD on LPE metabolic pathways still need further study.
Objective To evaluate the internal fixation effect, degradation, and biocompatibility of polylactic-co-glycolic acid/hydroxyapatite (PLGA/HA) absorbable cannulated screws in treatment of lateral femoral condyle fracture of canine so as to provide the theory basis for their further improvement and clinical application. Methods Sixteen adult male Beagles (weighing, 9-12 kg) were selected to prepare the models of bilateral lateral femoral condyle fracture; left fracture was fixed with PLGA/HA absorbable cannulated screws as experimental group and right fracture with metal screws as control group. At 2, 4, 8, and 12 weeks after operation, general observation was done and X-ray films were taken for observing fracture healing; bone mineral density was measured; the histological examination was performed; and the degradation property of absorbable cannulated screws was detected. Results All animals survived to the end of the experiment. General observations showed that no fracture displacement occurred and fracture healed at 12 weeks in 2 groups; no breakage, displacement, or loosening of screws was observed in experimental group. X-ray films results showed that the absorbable cannulated screws could not be found out by X-ray in experimental group, but metal screws could be found out in control group; fracture healed with time in 2 groups. The bone mineral density reached the peak at 8 weeks in 2 groups, and no significant difference was found between 2 groups and among different time points in the same group (P gt; 0.05). Histological examination showed that 2 groups had similar fracture healing process at different time points; no obvious inflammatory reaction was found around absorbable cannulated screws in experimental group. The degradation results of absorbable cannulated screws showed that the intrinsic viscosity and molecular weight distribution obviously decreased at 2 weeks; the number average molecular weight and the weight average molecular weight markedly decreased at 4 weeks; and the maximum shear force did not decrease obviously at 8 weeks, and then decreased significantly. Significant differences were found in all indexes among different time points in the same group (P lt; 0.05). Conclusion PLGA/HA absorbable cannulated screws and metal screws show similar fracture healing process for fixing lateral femoral condyle fracture of canine, and the absorbable canulated screws have good biocompatibility. The maximum shear force of PLGA/HA absorbable cannulated screw has no obvious decrease during 8 weeks after operation, so it can ensure full healing of fracture.
The aim of this paper is to explore the prevention of rabbit postoperative abdominal cavity adhesion with poly (lactic-co-glycotic acid) (PLGA) membrane and the mechanism of this prevention function. Sixty-six Japanese white rabbits were randomly divided into normal control group, model control group and PLGA membrane group. The rabbits were treated with multifactor methods to establish the postoperative abdominal cavity adhesion models except for those in the normal control group. PLGA membrane was used to cover the wounds of rabbits in the PLGA membrane group and nothing covered the wounds of rabbits in the model control group. The hematologic parameters, liver and kidney functions and fibrinogen contents were detected at different time. The rabbit were sacrificed 1, 2, 4, 6, 12 weeks after the operations, respectively. The adhesions were graded blindly, and Masson staining and immunohistochemistry methods were used to observe the proliferation of collagen fiber and the expression of transforming growth factorβ1 (TGF-β1) on the cecal tissues, respectively. The grade of abdominal cavity adhesion showed that the PLGA membrane-treated group was significant lower than that in the model control group, and it has no influence on liver and kidney function and hematologic parameters. But the fibrinogen content and the number of white blood cell in the PLGA membrane group were significant lower than those of model control group1 week and 2 weeks after operation, respectively. The density of collagen fiber and optical density of TGF-β1 in the PLGA membrane group were significant lower than those of model control group. The results demonstrated that PLGA membrane could be effective in preventing the abdominal adhesions in rabbits, and it was mostly involved in the reducing of fibrinogen exudation, and inhibited the proliferation of collagen fiber and over-expression of TGF-β1.