Objective To study the combined effects of p,p'-DDE and ?-BHC on lipid peroxidation in the rat Sertoli cells in vitro. Methods After separated Sertoli cells from testicular tissue of rats and treated with the toxicants at different doses, p,p'-DDE(10, 30, 50 ?mol/L), ?-BHC(10, 30, 50 ?mol/L) and p,p'-DDE+?-BHC(10+10, 30+30, 50+50 ?mol/L) which were decided by MTT method, the leakage of LDH, the activity of SOD and the contents of MDA in Sertoli cells were determined. Results The absorbance values of 50 ?mol/L p,p'-DDE and ?-BHC were significantly decreased (P

Objective To explore the fibrotic stroma characteristics of orthotopic liver cancer in rat and the relationship with MR delayed contrast enhancement.Methods 4 Wistar rats with orthotopic liver cancer underwent conventional triphasal and longer-de-layed contrast-enhancement MR scanning.12 HCC specimens obtained from the four Wistar rats were sliced and stained with HE, picric-sirius red,Verhoeff Van-Gieson elastic fiber,Gordon-Sweets reticular fiber and anti-α-SMA immunohistochemical staining.The relationshp between intratumoral fibrotic stroma and MR delayed phases of the 1 2 tumors were analyzed.Results Collagen fiber was expressed mainly in tumor fibrous septum.Elastic fiber distributed in tumor fibrous septum and the artery wall.Reticular fiber dis-tributed in fibrous septum of the regenerative nodules,portal area and tumor psuedocapsule.Integrated optical density (IOD)value of collagen fiber,elastic fiber and reticular fiber analyzed by Image-pro Plus6.0 were 0.102±0.020,0.063±0.018 and 0.109±0.032, respectively.As a result,the amount of collagen and elastic fibers were statistically different (P<0.01),and so were reticular fibers and elastic fibers (P<0.01).And there was a positive correlation between collagen fiber and MR delayed contrast enhancement (P<0.05).Conclusion MR delayed contrast enhancement of hepatic cancer in rat is closely associated with the collagen fiber,thus this fiber in liver cancer can be evaluated noninvasively by MRI.

Objective To investigate the significance of modified gold nanocages ( GNCs ) in photothermal therapy and radiosensitivity enhancement for murine mammary carcinoma 4T1 cells.Methods A molecule probe, CD44-PEG-GNCs, was constructed on the basis of GNCs.Inductively coupled plasma mass spectrometry ( ICP-MS) and transmission electron microscopy ( TEM) were used to analyze Au uptake by 4T1 cells.The cell counting kit-8( CCK-8) assay was used to determine the impact of the probe on the viability of 4T1 cells.The CCK-8 assay and the Hoechst/PI double staining were used to evaluate the photothermal killing effects of near infrared laser (NIR).The colony forming assay and the Hoechst/PI double staining were used to measure the viability of 4T1 cells after irradiation with 6 MV of X-ray.Results ICP-MS and TEM showed that 4T1 cells had an uptake of a large number of GNCs, in which the number of CD44-PEG-GNCs taken up by 4T1 was 3-4 times larger than that of PEG-GNCs.The cell toxicity assay revealed that in a certain range of concentration, GNCs showed little effect on the viability of 4T1 cells, which was reduced to 81.2%in 48 hours.The CCK-8 assay, the Hoechst/PI double staining, and the colony forming assay showed that after NIR irradiation and radiotherapy, large-scale apoptosis was induced in CD44-PEG-GNCs-contained tumor cells by photothermal therapy combined with radiotherapy, which had substantially better outcomes than other groups.Conclusions The GNC-based molecular probe actively targets 4T1 cells with little cytotoxicity, indicating that it enhances the sensitivity of tumor towards photothermal therapy and radiotherapy.

Objective:To investigate the expression of MMP-1 and MMP-8 in periodontal tissues in rats with periodontitis at different stages of inflammation with varied severity. Methods:Periodontitis was induced by silk ligature. P.gingivalis(Pg) or Pg with F.nu were used to induce the varied severity of periodontitis in 40 rats. 14 and 28 days after periodontitis induction the animals were sacrificed, periodontal tissues were immunohistochemically stained by antibody of MMP-1 and MMP-8 respectively. Results:MMP-1 and MMP-8 were both strongly positive in gingival epithelia cells and fibroblasts in periodontal ligament in rats with periodontitis.Higher expression of MMP-1 and MMP-8 was observed at 14 d than at 28 d(P0.05). Conclusion:The expression of MMP-1 and MMP-8 varies in different stage of periodontitis. MMP-1 and MMP-8 may play an important role in development of periodontitis.

Objective To express and purify the glycoprotein extracellular domain (Ex-GP) of Rabies virus strain CTN in soluble form with high efficiency.Methods A recombinant expression plasmid containing the gene encoding the Ex-GP was constructed.Various expression conditions were screened to obtain an optimum prokaryotic expression system for Ex-GP in soluble form.The expressed target protein was purified using affinity chromatography and gel filtration chromatography.Results The target protein Ex-GP with high antigenicity was efficiently expressed in soluble form by using the recombinant PBCX expression system and effectively purified by using affinity and gel filtration chromatography.Conclusion The soluble form of Ex-GP is successfully expressed and purified in a simple and convenient way.This study paves the way for further researches on the biological functions of rabies virus glycoprotein,the pathogenic mechanism of rabies and the development of diagnostic reagent and vaccines for rabies virus.

Objective: To study the effect of oxymatrine on oxidative stress and inflammatory reaction after cerebral ischemia reperfusion in rat. Methods: A total of 140 SD rats were randomly divided into the sham group, model group and oxymatrine low, medium, high-dose groups (28 in each group). Beyond the sham group, the other groups were established the rat model of focal cerebral ischemic reperfusion with Zea-Longa occluded suture. The the low-, medium- and high-dose matrine groups were given 25, 50, and 100 mg/kg oxymatrine solutions injected intraperitoneally from the second day after operation for 7d. , The model group and the sham group were injected with an equal volume of saline. The neurological deficits, ratio of infarct volume, water content of the brain were evaluated; the morphological changes of brain tissue were observed by HE Staining, and the cell apoptosis were observed after TUNEL staining; the activity of antioxidant enzymes and malondialdehyde (MDA) in brain tissue were measured by biochemical analysis; the content of NO and the activity of iNOS were measured; the expression of NF-ĸB were determined by Western blotting. The inflammatory cytokines in brain tissue were determinated. Results: Compared with the model group, the neurological function score, brain tissue water content, infarct volume and apoptotic index decreased in the rats of oxymatrine medium-, high-dose groups (P<0.05 or P<0.01). The activity of SOD (148.68 ± 9.12 U/mg, 161.34 ± 10.09 U/mg vs. 140.63 ± 8.47 U/mg), CAT (3.90 ± 1.32 U/mg, 4.15 ± 1.47 U/mg vs. 2.73 ± 0.89 U/mg), GSH-Px (11.46 ± 2.65 U/mg, 13.59 ± 3.27 U/mg vs. 9.35 ± 2.03 U/mg) were significantly increased (P<0.05 or P<0.01). The content of MDA (20.18 ± 3.59 μmol/g, 17.46 ± 3.21 μmol/g vs. 29.86 ± 5.40 μmol/g), iNOS (12.64 ± 1.83 U/mg, 11.75 ± 1.62 U/mg vs. 14.17 ± 2.06 U/mg), NO (23.64 ± 2.18 μmol/g, 21.27 ± 2.03 μmol/g vs. 27.82 ± 2.42 μmol/g), TNF-α (43.9 ± 6.3 nmol/L, 37.2 ± 5.8 nmol/L vs. 56.3 ± 6.9 nmol/L), IL-1β (715.0 ± 68.5 nmol/L, 683.9 ± 70.8 nmol/L vs. 930.8 ± 91.4 nmol/L), IL-6 (168.4 ± 22.5 nmol/L, 133.7 ± 18.1 nmol/L vs. 212.5 ± 24.7 nmol/L) were significantly decreased (P<0.05 or P<0.01). The expression of NF-ĸB in brain (0.35 ± 0.13, 0.24 ± 0.08 vs. 0.62 ± 0.15) were significantly down-regulated (P<0.05 or P<0.01). Conclusions The Oxymatrine inhibits oxidative stress injury and inflammatory response after cerebral ischemia-reperfusion in rats.

Objective To investigate the relationship between the single nucleotide polymorphisms (SNP) of programmed cell death-1 (PD-1) gene and early virologic response of interferon-α (IFN-α) in patients with chronic hepatitis B (CHB). Methods A total of 135 CHB patients were prospectively enrolled in this study. SNP of PD-1.1 and PD-1.2 genes were examined by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in these patients.Then its relationship with early virologic response to IFN-α treatment was analyzed. The data were analyzed by x2 test. Results Among the 135 patients, 33 (24.4%) achieved early virologic response to IFN-α. There were 35, 77, and 23 patients with AA, AG, GG genotgpe of PD-1.1. The early virologic response was achived in 5(14.3%), 25(32.5%) and 3(13.0%) among patients with AA,AG, GG genotypes of PD-1.1, respectively. There were statistically different (x2 = 6. 258, P =0. 044). The subjects with AG genotype showed higher response rate than those with AA or GG genotypes (x2 = 6. 246, P= 0. 012). However, the early virologic response rates were not significant different among subjects with AA, AG or GG genotype of PD-1. 2 ( x2= 3.957, P= 0. 138).Conclusion SNP of PD-1.1 gene may be used as a marker to predict the early virologic response to IFN-α treatment in Chinese CHB patients.

ObjectiveTo improve the understanding of chronic myelomonocytic leukemia associated with Sweet' s syndrome.MethodsRetrospective analysis of a case of chronic myelomonocytic leukemia associated with skin herpes was reported. Skin biopsy was performed. DA and CAG regiment were administrated.ResultsSweet's syndrome was diagnosed by skin biopsy.Corticosteroids therapy alone was not effective. Complete remission was achieved by CAG regiment and skin rash has been effectively controlled.Three months later Sweet' s syndrome relapsed and chronic myelomonocytic leukemia developed into acute myelomonocytic leukemia. ConclusionChronic myelomonocytic leukemia associated with Sweet's syndrome is rare but implies a quick progression to acute myelomonocytic leukemia.

AIM: Cystostomy is the traditionary method for detecting urodynamic indexes in mice, which de-stroys the continuity of the bladder, and there are significant differences between this method and the clinically used trans-urethral method.This study aims to develop an appropriate urethral catheter to investigate the advantages and application val-ue of transurethral method for urodynamic test.METHODS:A pediatric intravenous catheter was used for urethral catheter-ization on 8 female mice, and linked to connect the catheter to baroreceptor and micropump.The epidural catheter was also used as manometry tube.RESULTS:Using this method, the following urodynamic indicators has been successfully cap-tured:basal bladder pressure (BBP), bladder leak point pressure (BLPP), maximum voiding pressure (MVP), maxi-mum bladder capacity ( MBC ) , post-void residual urine volume ( PVR ) , voiding volume ( VV ) , efficiency of voiding ( EV) and bladder compliance ( BC) .CONCLUSION:This is the first successful simulation used in human body to a-chieve mouse urodynamic testing through the urethra catheter, which avoids the impact of cystostomy on urodynamics in mice, and the mice are able to keep long-term survival after tests for the follow-up molecular and genetic experiments.

Objective:To investigate the etiology, clinical characteristics, and treatment of myelodysplastic syndrome/acute my-eloid leukemia (t-MDS/AML) secondary to malignant tumors. Methods: We retrospectively analyzed 11 patients with t-MDS/AML and investigated the treatment of primary tumors, clinical manifestations, treatment, and survival of t-MDS/AML patients. Results:A total of 11 patients were exposed to cytotoxic chemotherapeutic agents or radiation therapy for their primary tumors. The median laten-cy was 36 months. Common symptoms were fatigue, dyspnea, bleeding, and infection, all of which were related to deficits in hemato-poiesis. Therapeutic regimen included support therapy, immunomodulatory therapy, and chemotherapy. The median overall survival and disease-free survival periods were 28 months and 19 months, respectively, and the overall survival rate for 3 years was 44.4%. Conclu-sion:t-MDS/AML is a serious complication of chemotherapy or radiotherapy for a malignant or nonmalignant condition. The curative effect is limited, and prognosis is poor. Therefore, we should take t-MDS/AML into consideration when making treatment plans for can-cer patients to evaluate treatment benefits and to avoid treatment-related complications.