Hua xi yi ke da xue xue bao = Journal of West China University of Medical Sciences = Huaxi yike daxue xuebao最新文献

Objective: To investigate the effects of activities of Ca(2+)-ATPase and Na(+)-K(+)-ATPase in plasma membranes of hepatocytes on the formation of calcium bilirubinate gallstone.

Methods: The rabbit models for studying calcium bilirubinate gallstone were used. One hundred and three rabbits were randomly divided into the control (sham operation) group (Con, n = 28), the simple biliary obstruction group (BO, n = 36), and the biliary obstruction and infection group (BOI, n = 39). The activities of Ca(2+)-ATPase and Na(+)-K(+)-ATPase in plasma membranes of hepatocytes and the intracellular calcium content were measured on the 3rd, 7th, 14th and 20th days after operation.

Results: The activities of Ca(2+)-ATPase and Na(+)-K(+)-ATPase decreased remarkably in all phases of BOI and BO groups as compared with those of Con group (P < 0.01). The over-loaded intracellular calcium was found in both BOI and BO groups. The above-mentioned changes were more significant in BOI group than in BO group (P < 0.05).

Conclusion: The progressive decrease of the activities of Ca(2+)-ATPase and Na(+)-K(+)-ATPase is in close relationship with the continuous increase of intracellular calcium content during the formation of calcium bilirubinate gallstone in rabbit models. Infection can aggravate those changes and further the formation of stone.

Objective: This study was aimed to evaluate the potentiality for the use of apoptosis cells count as a chemosensitivity testing in vitro for ovarian cancer.

Methods: An end-labelling assay was used to determine the apoptosis cells of 4 specimens of fresh ovarian cancer cells and the results were compared with that of ATP assay.

Results: It was found that chemotherapy can induce apoptosis, and the same chemotherapeutic agent can induce different apoptosis cells for different cancers.

Conclusion: The observed agreement between apoptosis cells count and ATP assay was 0.75. The above data demonstrate that apoptosis cells count can be used as a chemosensitivity testing for ovarian cancer, and a combination of these two methods may improve the clinical effects of chemotherapeutic agents.

Objective: To evaluate the efficacy and safety of domestic sparfloxacin.

Methods: A multicentre randomized controlled clinical trial was conducted to compare sparfloxacin versus ofloxacin in the treatment of acute bacterial infections. 58 patients received 200 mg of sparfloxacin once daily intravenous drip and 61 patients received 200 mg of ofloxacin twice daily intravenous drip. Both drugs were given for 7-14 days.

Results: The clinical cure rates of sparfloxacin group and ofloxacin group were 44.83% and 42.62%, and the efficacy rates were 87.93% and 81.97%, respectively; no significant differences were noted between the two groups (P > 0.05). The bacterial eradication rates were 86.00% and 84.62% respectively (P > 0.05). The adverse reactions in the two groups were 13.79% and 22.58% (P > 0.05). Photosensitivity reaction was not observed in this study.

Conclusion: Domestic sparfloxacin is effective and safe in treating acute bacterial infections.

Objective: To explore the possible effect and related mechanism of salviae miltiorrhizae (SM) and ligustrazine in the treatment of urethral scar.

Methods: In vitro cultivation of fibroblasts derived from urethral scar has been developed. The effects of these two medicines on its morphology and proliferation have been detected based on the in vitro culture system.

Results: The spindle cells were found to become elliptical in shape. The two medicines inhibited the proliferation of fibroblasts derived from urethral scar, and this may be resulted from their inhibitive effects on cell division rather than cell necrosis or degradation.

Conclusion: Salviae multiorrhizae and ligustrazine as effective scar inhibitors may have application prospects in the treatment of urethral stricture.

Objective: To make a comparision of cell function between the mesangial cells from rats with diabetic mellitus (DMC) and the mesangial cells stimulated by high glucose (HMC) and to explore the feasibility and advantage of culturing mesangial cells (MC) from diabetic rats in studies on the pathogenesis of diabetic nephropathy.

Methods: DMC were obtained from rats with streptozotocin-induced diabetes and were cultivated in normal medium. The MC from normal rats were divided into HMC high glucose and NMC cultured in normal medium as control. The cellular proliferation was assessed using 3H-thymidine incorporation. Production of fibronectin (FN) was analysed by ELISA. And with the use of laser scanning confocal microscopy, the calcium concentration ([Ca2+]i) and the response of [Ca2+]i to Angiotensin II (Ang II) were measured.

Results: The 3H-TdR incorporation efficiency of DMC was significantly higher than that of CMC; the 3H-TdR incorporation efficiency of HMC was lower than that of CMC (P < 0.05). The secretion of FN in DMC and HMC was higher than that in CMC (P < 0.01 and P < 0.05 respectively). The response of [Ca2+]i to Ang II in DMC and HMC was decreased (P < 0.05), and the decrease was more significant in DMC than in HMC.

Conclusions: The function and biologic character of mesangial cells cultured from diabetic rats are more similar to those of mesangial cells from diabetic in vivo. The result suggest that establishing a diabetes model first and starting the culture of MC next is probably a good method for investigating the mesangial cells in diabetic nephropathy.

Objective: To study the expression of glucocorticoid receptor (GR) isoform in the peripheral blood mononuclear cell (PBMC) of patients with Graves' ophthalmopathy (GO).

Methods: Semi-quantitative RT-PCR was used to analyze RNA isolated from PBMC of the patients with GO and the normal volunteers. The level of plasma total cortisol (PTC) at 8 a.m. was measured.

Results: The hGR alpha/GR beta mRNA ratios of the two groups were 7.58 +/- 5.42 and 14.65 +/- 8.30, respectively. There was significant difference between the two groups (P < 0.05). The PTC levels of the two groups were 304.23 +/- 92.06 and 313.73 +/- 111.05, and no significant difference between them was noted (P > 0.05). No correlation was found between hGR alpha/GR beta mRNA and PTC levels.

Conclusion: hGR alpha/GR beta mRNA may play a role in the pathogeny of Graves' ophthalmopathy.

Objective: To investigate the effects of testosterone on VEGF and FLK-1 protein expression in the ventral prostate of Rat.

Method: SD rats were castrated, and 7 days later they were injected with different doses of testosterone. The histological changes were observed with the use of HE staining, and the protein expression of VEGF, FLK-1 were measured by immunohistochemical test.

Results: In the normal ventral prostate, different growth forms of epithelium were observed. In the castrated group, the proteins of VEGF, FLK-1 were positive in growth active epithelium and vascular endothelium; the weight of prostate decreased (P < 0.05); the histological appearance was epithelial atrophy, and there was significantly decreased protein expression of VEGF, FLK-1 in the prostatic epithelium (P < 0.05). It was found that testosterone injection stimulated prostatic hyperplasia gradually The histological changes were epithelial progressive proliferation. And a gradually increased protein expression of VEGF, FLK-1 in the prostatic epithelium was detected (P < 0.05).

Conclusion: Testosterone can stimulate prostatic growth probably by upregulating the protein expression of VEGF and FLK-1.

Objective: Dendritic cells (DCs) are the most potent antigen presenting cells (APCs) of the immune system. We intent to block the expression of CD86 in DCs using antisense peptide nucleic acids (PNA), a novel synthetic structural DNA mimic, and interrupt the second signal transmission so that a suppression of corresponding T cell function can be achieved.

Methods: Human DCs grown up from peripheral blood monocytes in GM-CSF and IL-4 were collected. We investigated antisense PNA internalization with laser scan confocal microscope (LSCM). Fluorescence immunocytochemistry, flow cytometry and RT-PCR were used to determine the expression of CD86 protein and mRNA in DCs.

Results: LSCM proved that cultured immature DCs could internalized PNA efficiently, according to the specific internalization property of the immature DCs. Antisense PNA DC exhibited striking reductions in cell surface staining for CD86, but not MHC class II, and were poor stimulators of T cell proliferation. RT-PCR found that PNA depressed the amounts of CD86 mRNA in DCs.

Conclusion: Antisense PNA against CD86 could inhibit the expression of CD86 mRNA and protein in DCs. The blockade of B7/CD28 pathway may increase the potential of costimulatory molecule-deficient antisense PNA DCs of donor origin to induce long-lasting allograft survival.

Objective: To explore the mechanism of ischemia reperfusion injury (IRI) and the protective effect of Yisheng injection on endothelial cells (ECs).

Methods: Human umbilical veins endothelial cell line ECV304 was cultured in RPMI medium 1640 without glucose under 100% N2 for one and a half hours, and then in RPMI medium 1640 with glucose under normal conditions for 5 hours to mimic ECs' IRI posttransplantaion. A pure nature medicine, Yisheng injection was added into the medium in experimental group. Intracellular calcium and mitochondrial were shown through flourescent staining. The activities of succinic dehydrogenase (SDH) and lactic dehydrogenase (LDH) were detected by cytochemical staining. The concentrations of superoxide dismutase (SOD), malonaldehyde (MDA) and nitrous oxide (NO) in culture medium were determined.

Results: After treatment with anoxia-reoxygenation, the ECs' morphologic changes were observed, and intracellular calcium concentration, LDH activity, MDA concentration became higher. Meanwhile, mitochondrial membrane potential, concentrations of SOD and NO were lower. Yisheng injection made these changes disappear or become less.

Conclusion: Anoxia-reoxygenation induces lipid peroxidation, calcium superrcharge in ECs, and damage to mitochondrial function. Yisheng injection can reverse these changes, thus protecting the endothelial cells.

Objective: To make a study on the preparation and tissue distribution of staphylococcal enterotoxin A (SEA) liposomes and to provide scientific basis for the therapy of liver cancer by using SEA liposomes.

Methods: SEA liposomes were prepared by reverse-phase evaporation; the diameter and entrapment efficiency (EC) of SEA liposomes were determined. 125I labeled SEA solution and 125I-SEA liposomes were administrated intravenously to mice, respectively. The radioactivity of the organs was determined by gamma-counter.

Results: The mean diameter and EC of SEA liposomes were 505 +/- 34 nm and 44.1% +/- 4.8%, respectively. SEA liposomes were found mainly distributed in the liver and spleen. SEA liposomes had a higher blood clearance, compared with SEA solution; SEA solution had high-radio-activity in plasma and kidney; there was statistical significance between the two groups (P < 0.05).

Conclusion: The preparation method of SEA liposomes is simple and repeatable. SEA liposomes possess liver-targeting properties and may provide a new application foreground for the treatment of liver cancer.