Objective To investigate the effects of HBcAg-specific CD8+T cells on inhibiting HBV replication in vitro,and to search the cytokine of noncytolytic mechanisms in viral clearance. Methods By the method of coculture of HepG2.2.15 cell (target cells) with HLA-A2 matched HBcAg-specific CD8+T cell clone (effector cells) at E:T ratios of 1:50,and monitoring HBV production (HBsAg,HBeAg,and HBV-DNA)in coculture supernatants at 24h,48h and 72h,the percentage of decrease in HBV replication level was observed. Furthermore,blocking experiment with neutralizing mAbs to IFN-? was performed to evaluate the effect of this cytokine. Results CD8+T clone produced high levels of IFN-?following coculture with 2.2.15 cells. HBsAg,HBeAg and HBV-DNA in coculture supernatants were significantly reduced,and the greatest effect was observed at 72h by 54.55%,50.36% and 74.55%,respectively. The reduction of HBV DNA was decreased followed by using neutralizing mAbs to IFN-?. The maximum activity of cytotoxicity of target cells was at 24h by 15.66%. Conclusion ①HBV-specific CD8+T cells inhibit HBV replication by cytolytic and noncytolytic mechanisms.②The effect of noncytolytic mechanisms is mainly mediated by IFN-?.

AimTo investigate the immune effects of the genetic engineering vaccine against swine cysticercosis with the animal mode of kunming mouse. Method78 kunming mice were randomly divided into three groups: 1 )injection one times with the vaccine, 2)injection twice with the vaccine at intervals of ten days, 3)non-vaccination group. All the mice were infected with the vial hatched oncopheres by the tag vein at 20 days after the first vaccination,and were killed and dissected to look for swine cysticerci 63 days later. In order to know the immune response of the vaccine and the stateof parasites in the rats,the antigens and antibodies of swine cysticerci were detected by immune methods. ResultsThe vaccine was safety to all the vaccinated rats. The antibodies against swine cysticerci began to appear positive in some of the immunized mice at 7 days postvaccination,and they were all positive at 21 days. 65 cysticerci were found in the mice of the nonvaccination group,which lodged mainly in the chests. 2 and lcysticerci were respectively found in two rats of the first group and in one rat of the second group, their protective rates of cysticerci were 96.9％ and 98. 4％,respectively. ConclusionKunming mouse as the animal model of swine cysticercosis was stable and reliable,and the genetic engineering vaccine against swine cysticercosis was safety and efficiency.

Objective To analyze the MR manifestations of the focal nodular hyperplasia (FNH)in liver and observe the MRI changes after 30-36 months.Methods 12 (14 lesions)of the 13 patients (1 5 lesions)were firstly diagnosed as FNH by MRI with plain scan and dynamic Gd-DTPA enhancement,and then were confirmed by the follow-up survey with similar MRI after 30 - 36 months.The last one patient was also scanned with Gd-EOB-DTPA enhancement but with similar plain scans.The size,signal,en-hancement patterns of the lesions were analyzed and compared with those in the follow-up survey.Results Typical MR manifesta-tions were found in 93.33%(14/1 5)of the lesions with hypo-or iso-intensity on T1 WI,hyper-or iso-intensity on T2 WI,marked en-hancement in arterial phase and attenuation but still equal to or higher than normal liver parenchyma in portal and delayed phases af-ter Gd-DTPA administration.In addition,the central scar showed hypointensity on T1 WI,hyperintensity on T2 WI,and enhance-ment in delayed phase.The enhanced small vessels inside lesions and the pesudocapsule enhancement could be seen in delayed phase. The only one lesion with Gd-EOB-DTPA enhancement showed marked enhancement in arterial and portal phases,and slight hyperin-tensity in hepatocellular phase with hypo-intense central scar in any phases.As for the only one lesion with atypical manifestation,it showed isointensity on T1 WI,slightly hyperintensity on T2 WI,nonenhancement in arterial phase,slightly enhancement in portal phase,and small vascular enhancement inside the lesion in delayed phase.After the follow-up survey of 30-36 months 92.86%(13/14)lesions did not change,however one lesion (10mm)disappeared.Conclusion Typical FNH shows similar MRI characteristics, iso-intense or slightly hypo-intense signal on T1 WI,iso-intense or slightly hyper-intense signal on T2 WI,marked enhancement in ar-terial phase,the central scar enhancement and the inside small vascular enhancement of lesions in delayed phase.It is valuable in dif-ferential diagnosis.

Objective To evaluate the application of 1H-MRS in chronic liver diseases related with hepatitis B, and to investigate the method of eliminating breathing influence to proton MR spectroscopy (1H-MRS) on liver. Methods Liver spectroscopy of 46 subjects were obtained by single-voxel PRESS sequence with respiratory gating with GE 1.5T scanner. The subjects were divided into 4 groups: the normal male group (10 cases), the normal female group (10 cases), the male hepatitis B cirrhosis group (14 cases) and the male liver cancer after hepatitis B group (12 cases) according to clinical data, MR manifestations and pathologic findings. Glutamine and glutamate complex (Glx) peak height served as a reference standard to judge the choline (Cho) peak height. The differences of Cho peak height of each group were compared. Results The peaks of Cho were lower than those of Glx in normal male group. The peaks of Cho were higher than those of Glx in 8 women of normal female group. The peaks of Cho were higher than those of Glx in 11 patients of the male hepatitis B cirrhosis group. The peaks of Cho were higher than those of Glx in 10 patients of the male liver cancer after hepatitis B group. The differences of Cho peak were statistically significant between normal male group and normal female group, the male hepatitis B cirrhosis group and the normal male group, the male liver cancer after hepatitis B group and the normal male group. Conclusion The peaks of Cho in normal males are lower than those of Glx. The peaks of Cho in the majority of normal females are higher than those of Glx. The peaks of Cho increase in male hepatitis B cirrhosis and liver cancer after hepatitis B. Respiratory gating can effectively eliminate the impact of breathing movement on proton MR spectroscopy of liver.

Objective To summarize the experience of totally endoscopic thyroidectomy (TET) in treating differentiated thyroid carcinoma and to evaluate its feasibility, safety and the therapeutic result.Methods The clinical data of 25 cases of thyroid carcinoma treated with TET via the areola of breast or by axillary approach from November 2004 to July 2009 in our hospital were retrospectively analyzed.Result TET procedures were successfully performed in all 25 cases. Postoperative pathology confirmed that 23 cases were of papillary cancer and the other 2 were follicle cancer. Lobectomy and subtotal thyroidectomy were performed in 11and 14 cases respectively. In 7 cases additional lymph node dissection was performed.All the cases were followed-up, ranging from 5 to 58 months, with a median of 28 months. No recurrence was found during this period. There was no morbidity nor major complications and patients were all satisfied with the cosmetic effect. Conclusion Totally endoscopic thyroidectomy (TET) is curative, safe and cosmetic therapy for differentiated thyroid carcinoma.

Protective immune response of the available IBD vaccine is insufficient to fully protect against the prevailing strain of the infectious bursal disease virus (IBDV). Such a vaccination escape IBDV field isolate idenfied from Anhui province of China in December 2007, where IBD broke out at 2 weeks post vaccination. The IBDV vp2 gene was cloned into pFastBacHTA donor plasmid, followed by generation of the recombinant bacmid DNA pBac-VP2. The latter was used to transfect insect cell Sf9 with Lipofectamine to produce recombinant baculovirus vBac-VP2. The Sf9 cells infected with vBac-VP2 were stained positive against IBDV antibody using the indirect immunofluorescence assay (IFA), which was also confirmed by the detection of IBDV Vp2 protein in the infected Sf9 cells by IBDV sandwich ELISA. Western blotting revealed that the calculated protein of approximately 53 kDa was in the expressed in the insect cells. Moreover, virus-like particles (VLPs) and "inclusion body-like"structure in the infected Sf9 cells were observed under electron microscopy. We further developed an indirect ELISA for the detection of the IBDV antibodies, which was specific and sensitive. In addition, the lysates of vBac-VP2 infected cells was used to immunize 2-week-old SPF chickens, followed by challenging with the virulent IBDV, the survival rate was 30% at 14 days post primary immunization, however, the survival rate was 100% at 14 d after the booster vaccination. The ELISA antibody titers was up to 3.2 x 10(3) and neutralization antibody titer was 2536, significantly higher than those of one-shot vaccination, 8 x 10(2) and 1106, respectively. The immunized chickens did not show any clinical signs and histopathological changes of infection in 7-days trial time. The bursa/body-weight ratios were higher than those of the unimmunized control (P < 0.05). The virus-like-particle recombinant Vp2 protein expressed in insect cells promises to be a novel subunit vaccine and diagnostic reagent candidate for IBDV.
Animals ; Baculoviridae ; genetics ; Cell Line ; Chickens ; Infectious bursal disease virus ; immunology ; Insecta ; genetics ; metabolism ; Poultry Diseases ; prevention & control ; Recombinant Proteins ; biosynthesis ; genetics ; immunology ; Viral Structural Proteins ; biosynthesis ; genetics ; Viral Vaccines ; immunology