Objective To explore the significance and the ultrastructural changes of platelets in patients with acute cerebral infarction.Methods Changes of platelets in 20 patients with acute cerebral infarction were observed by transmission electron microscope.Results The ultrastructural changes of platelets within 24 hours after the onset were significant,including more pseudopodium,aggregation and fusion;there were remarkable fewer alpha granules and mitochondria,the remain of mitochondria swelled and more disruption of platelet membrance were found.The degree of platelet changes consisted with the severity and sizes of cerebral infarction.The ultrastructural change of platelets was obviously restored after 2 weeks,but no restoration was found in 3 patients with large area infarction.Conclusion Ultrastructural changes of platelets in acute period of cerebral infarction were remarkable,especially a lack of alpha granules,this might be regarded as an objective index in the judgment of severity and prognosis of cerebral infarction.

Objective To observe the outcome of Nimodipine and Salvia Miltiorrhiza Composite in treating newborn hypoxic ischemic encephalopathy(HIE ) . Methods 128 HIE patients were randomly divided into four groups;-Salviae Miltiorrhiza Compsite treated group (n=32) , Nimodipine treated group (n 30) , Nimodipine plus Salviae Miltiorrhiza Composite treated group ( n =35) , and control group ( n =31) , in which the symptoms and signs , the reactions following treatment were observed .Results The total effective rates of Salviae Miltiorrhize Composite treated group , Nimodipine treated group , Nimodipine plus Salviae Miltiorrhiza Composite treated group were 81.3% (26/32) , 80% (24/30) and 97.1% (34/35) respectively , and the markedly effective rates were 53.1% (17/32) , 53.3% (16/30) and 88.6% (31/35) respectively . The total effective rates and the markedly effective rates of control group were 51.6% (16/31) and 6.5% (2/31) respectively ,the treated groups were higher than that of control group ( P

Objective To investigate the effects of different surgical modalities on primary anorectal malignant melanoma. Methods Clinical data of 60 primary anorectal malignant melanoma cases who were admitted between 1965 and 2007 were collected, summarized and analyzed. Multivariate analysis was performed using the COX proportional hazards regression method. Results Tumors located in the rectum in 50 cases, in the anal canal in 10 cases. The overall survival rates were not significantly different between the 23 cases who received tumor resection only and those 30 cases receiving postoperative adjuvant therapy (X2=0. 078, P>0.05). Among these 53 surgical cases of anorectal malignant melanoma, 37underwent abdominoperineal resection, 16 underwent wide local excisions, There was no significant difference of the survival rates between the two groups (X2=1.464,P>0.05). Risk factors analysis revealed that the depth of tumor invasion is a risk factor (P<0.05), the modality of treatment is a protective factor (P<0.05). Conclusions Surgical operation is the principal effective management for anorectal malignant melanoma, Wide local excision is the principal therapeutic choice for localized well-circumferential anorectal malignant melanomas.

Objective To explore the changes and significances of platelet granule membrane protein-140 (GMP-140),GMP-140 in plasma,PAdT and PAgT in patients with acute cerebral infarction.Methods The platelet GMP-140 was measured with enzyme-linked immunosorbent assay (ELISA) competitive method and GMP-140 in plasma by ELISA double antibody method in blood collecting in 3 d and 2 weeks after onset in large(n=22),small(n=25) size and lacuna (n=20) cerebral infarction groups.Results The platelet GMP-140,GMP-140 in plasma,PAdT and PAgT in large cerebral infarction group in 3 d after onset were much higher than control group (P<0.001),and the small size and lacuna groups were higher (P<0.05～0.001) than control but lower than large group (P<0.05).There was no differences between the small and lacuna groups (P>0.05).The PAdT and PAgT in 3 groups were higher (P<0.01).The platelet GMP-140 and GMP-140 in plasma in all 3 groups in 2 weeks after onset had been clearly lower but still higher than control group (P<0.05),the PAdT and PAgT were normal or even more lower.Conclusion Platelet activation was significant in different types acute cerebral infarction,the concentration of GMP-140 in plasma can reflect the degree of platelets activities more well and truly than PAdT and PAgT.

Crocetin, a naturally occurring carotenoid, possesses antioxidant and antiatherosclerotic properties, of which the underlying mechanism remains unclear. In the present study, we examined the effects of crocetin (0.1, 1, 10 μmol·L(-1)) on angiotensin II (Ang II, 0.1 μmol·L(-1)) induced expression of vascular cell adhesion molecule-1 (VCAM-1) in human umbilical vein endothelial cells (HUVECs) and monocyte-endothelial cell adhesion. The effects of crocetin on the activation of nuclear factor kappa B (NF-κB) and intracellular reactive oxygen species (ROS) were also observed. The results demonstrated that crocetin notably suppressed Ang II induced NF-κB activation (P<0.01) and VCAM-1 expression (P<0.05, P<0.01) in HUVECs, accompanied by a markedly reduced monocyte-endothelial cell adhesion (P<0.05, P<0.01). In addition, preincubation with crocetin resulted in a significant enhancement of cellular antioxidant capacity (P<0.05, P<0.01), while Ang II induced intracellular ROS decreased markedly (P<0.05, P<0.01). These results indicated that crocetin was capable of suppressing Ang II induced VCAM-1 expression and monocyte-endothelial cell adhesion by suppression of NF-κB activation, which might be derived from the enhancement of antioxidant capacity and subsequent reduction of intracellular ROS.

BACKGROUND:For the sacroiliac joint has complex structure and locates deep,its biomechanical properties have not been fully understood,even less about the study of reconstruction.OBJECTIVE:To construct a finite element model of pelvis after subtotal sacrectomy,and validate its effectiveness,which is supposed to be useful for evaluating reconstructions of sacroiliac joint.TIME AND SETTING:The establishment and validation of three-dimensional finite element model was performed in the Orthopaedic Laboratory of Changhai Hospital,Second Military Medical University between January and March 2008.MATERIALS:The CT scan images of adult males who had no pathological changes in lumber and pelvis were downloaded from CT work station in Changhai hospital.The CT scan included low lumber and whole pelvis,and got 132 DICOM images in all.METHODS:Two three-dimensional finite element pelvis models were established:① an intact pelvis model,② a defective pelvis model on which subtotal sacrectomy was performed cephalic to the S1 neural foramina.According to the biomechanical experiment of Hugate RR Jr,axial loads of 3 000 N and 1 000 N were applied on intact and defective pelvis models,respectively.The max axial displacements and stiffness on the L5 of two models were calculated and following comparison with the result in the literature.MAIN OUTCOME MEASURES:The max axial displacements and stiffness on the L5 were observed and considered as the index reflecting sacroiliac joint stability.RESULTS:The max axial displacements of the L5 on intact and defective pelvis models were 7.99 mm and 7.68 mm,respectively.The stiffness of the L5 on intact and defective pelvis models were 375 N/mm and 130 N/mm,respectively.The max axial displacements of the L5 on intact and defective pelvis models in the literature were(10.73?5.10) mm and(11.71?5.74) mm,and the stiffness were(353?231) N/mm and(101?49) N/mm,respectivly .CONCLUSION:In this experiment,we were successful to establish the finite element model of pelvis after subtotal sacrectomy.The calculated result was similar with the reference.The model could be used to evaluate different ways to reconstruct the sacroiliac joint.

Objective To investigate the impact of polyclonal neural cell adhesion molecule antibody (P-NCAM-Ab) on the potency of botulinum toxin A (BTX-A).Methods Ninety male Sprague-Dawley rats were randomly divided into 3 equal groups:a normal control group,a BTX-A group and a P-NCAM-Ab group.The rats in the normal control group were injected with 100 μl of saline solution in their right gastrocnemius,while those in the BTX-A and P-NCAM-Ab groups were injected with 100 μl of BTX-A (0.5 U).In addition,the rats in the P-NCAM-Ab group were also injected with 100 μl of P-NCAM-Ab (the dosage was 20 U) at the same site on the 3rd day after the BTX-A injection.The rats' gastrocnemius muscle strength was evaluated with a self-made system for evaluating neuromuscular function before and after the toxin injection,on the 3rd day,as well as 1,2,4,6,8,10 and 12 weeks after the BTX-A injection.Any wet weight changes in the muscles were observed,and immunochemistry methods were employed to observe any structural changes in the motor endplates and nerve fibers at the different time points.Results After the saline injection,the average gastrocnemius muscle strength of the control group increased with time,while strength in the BTX-A and P-NCAM-Ab groups demonstrated a decrease in strength followed by a gradual increase.The average gastrocnemius muscle strength of the rats in the BTX-A and P-NCAM-Ab groups was significantly lower than that of the control group at all time points.Compared with the BTX-A group,the muscle strength of the P-NCAM-Ab group rats decreased further.Strength recovery in the BTX-A and P-NCAM-Ab groups was significantly slower than in the control group.The wet weight percentage in the BTX-A and P-NCAM-Ab groups at first decreased and then recovered with time.After the BTX-A injection,the average wet weight percentage of the P-NCAM-Ab group rats was significantly lower than that of the BTX-A group after 3 days,and 1,2 and 4 weeks.Karnovsky-Roots AchE staining showed that the motor endplates' color in the BTX-A and P-NCAM-Ab groups deepened gradually,though the color of the P-NCAM-Ab group was lighter than that of the BTX-A group at each time point.The mean optical density of the motor endplates' positive reaction area increased with time in both groups,but the P-NCAM-Ab group was lower than that of the BTX-A group at 1,2,4,8 and 12 weeks.Counting the nerve fibers dyed by gold chloride showed similar trends with both experimental groups significantly different from the control group.Conclusion P-NCAM-Ab can increase the potency of BTX-A and prolong its action.

Objective To investigate the role of a small RNA interference against VEGF in radiation sensitivity in melanoma .Methods A375 human melanoma cell lines were transplanted into nude mice ,which with malignant melanoma were randomly divided into control group , VEGF negative plasmid group and VEGF positive plasmid group, followed by 4Gy irradiation twice a week for 2 weeks.The volume of tumor was calculated twice a week, the area of tumor necrosis was assayed by HE,the expression of VEGF in tumor was determined by Western-blot and Immunohistochemical. ResuIts The expression of VEGF in VEGF positive plasmid group decreased significantly (P<0.05), VEGF positive group had more tissue necrosis, tumor growth was significantly inhibited (P<0.05).ConcIusion siRNA-VEGF in tumor injection liposome encapsulated in malignant melanoma has a role in the radiation sensitization, which provides an experimental basis for the clinical development of targeted therapy combined with radiotherapy for the treatment of VEGF gene.

Aim To synthesize 8-bromo-ethoxy Rhein and investigate its mechanisms and inhibition effect on hepatitis B surface antigen ( HBsAg ) and e antigen ( HBeAg) in HepG2.2.15 cells.Methods 8-bromo-ethoxy Rhein was synthesized based on the chemical structure of Rhein , and its structure was identified by IR,1 H-NMR and 13 C-NMR spectra.MTT assay was used to test the inhibitory effect of 8-bromo-ethoxy Rhein on HepG2.2.15 cells.After the cells treatment by 8-bromo-ethoxy Rhein , the HBsAg and HBeAg in cell supernatant were detected by ELISA .The expres-sion of hepatitis B virus X gene ( HBx) was detected by Western blot .The cell cycles were examined with flow cytometry.The intracellular free calcium concentration was detected by laser scanning confocal microscopy . Results The structure of 8-bromo-ethoxy Rhein was confirmed by IR,1 H-NMR and 13 C-NMR.MTT results showed that synthetic product and Rhein could inhibit the cell proliferation in HepG2.2.15 cells.After trea-ted with 8-bromo-ethoxy Rhein and Rhein for 72 h,the half inhibitory concentration 50%( IC50 ) was 14.29 mg? L-1 and 11.59 mg? L-1 , respectively .Using non-cytotoxic dose of 8-bromo-ethoxy Rhein , the inhibitory effect on HBsAg and HBeAg was gradually enhanced with increasing 8-bromo-ethoxy Rhein concentration . The inhibitory effect of synthetic product on hepatitis B virus was better than that of Rhein .8-bromo-ethoxy Rhein could down-regulate the expression of HBx , in-tracellular calcium ion concentration and block the hepatitis B virus ( HBV ) replication.Flow cytometry results showed 8-bromo-ethoxy Rhein didn′t affect the cell cycle .Conclusions Compare with Rhein , the synthesis of 8-bromo-ethoxy Rhein shows stronger inhi-bition on hepatitis B virus in HepG2.2.15, and its mechanisms may involve down-regulating the expres-sion of HBx and reducing calcium ion concentration .

Objective To make comparisons of the three models of acute and chronic rheumatic carditis to find out an optimal animal model.Methods AntigenⅠwas a emulsifier mixed by complete freund’ s adjuvant( CFA) and Group A streptococcus(GAS).AntigenⅡwas mixed by incomplete freund’s adjuvant(IFA) and GAS.Female Lewis rats were randomly divided into four groups: A, B, C treatmeat groups were immuned with antigenⅠat the foot pad firstly. Subsequently, rats in group A、B、C were injected antigenⅠ, antigenⅡand activated GAS respectively to make the models of RHD.Rats in control group D were immunized with the same protocol outlined as treatment groups but without GAS. Respectively 7, 12, 24 weeks the rats were sacrificed 24 ( each group was 6).The blood biochemical item and Hematoxylin-eosin( HE) staining of hearts were detected.Results In group C the mortality was 25%.In group A, the incidence of carditis was the highest.Histopathological manifestations of group A, C was not only revealed acute damage such as inflammatory cell infiltrate as well as group B, but also the Aschofflike cells in the myocardial cells interstitial.But in group A and C there had a great degree of the inflammatory cells infiltration than group B.At 24th week rats in group A detected the rate and degree of valve fibrosis in chronic damage were higher than group B and C.None of rats in group D presented carditis or valvulitis.Conclusion In group A, giving the GAS with continuous stimulation after using the mixed emulsification of CFA and GAS to immune Lewis rats for five times was a appropriate method which could provide an optimal animal model for experimental study of acute and chronic rheumatic heart disease.