Tumor vaccine is current hotspot of medicine. The article explicates the status quo, merit, side effects of tumor vaccine and brings up the ethic principle we should follow in clinic application.

Objective To study the internalization mediated by heat shock protein 70 (HSP70) receptors expressed on the surface of dendritic cells (DCs). Methods DCs from C57BL/6 mouse bone marrow were divided into HSP70 receptor-blocking group, non-receptor-blocking group and control group. The HSP70-FITC positive cells were detected by flow cytometry (FCM). Results FCM indicated that in HSP70 receptor-blocking group, the HSP70 receptors could be almost totally blocked by 50?g HSP70. With the increase of HSP70-FITC dosage, the number of HSP70-FITC positive cells increased. In non-receptor-blocking group, the rates of the HSP70-FITC positive cells were up to 90% either when 50?g HSP70-FITC or 100?g HSP70-FITC was used with no remarkable difference between them. Conclusions The internalization mediated by HSP70 receptors plays a major role in the stage of ingestion of HSP70 with the characteristics of saturation and priority. Once the receptors are blocked, non-receptor pathway participates in internalization in a dose-dependent manner.

Two highly specific monoclonal antibodies with potentul affinity against hepatocellular carcinoma HAb18, HAb25 as carriers, 131I and adriamycin (ADM) as warhead "double bomb"-mixed monoclonal antibodies immunoconjugates(131I-HAb18-ADM)/(131I-HAb25-ADM) was prepared by indirectly conjugated with dextran T-40 and chloramine-T methods. The immunoconjugating rate to target cells was 42.5%, labelling rate 49.8%, and specific radioactivity 6.88?104Bq/?g. In vitro, (131I-HAb18-ADM)/(131I-HAb25-ADM) showed stronger selective cytotoxicity against target tumor cells than either HAb18-ADM, or 131I-HAb18, or HAb25-ADM, or 131I-HAb25 conjugate alone(P

Assay"'of Epstein-Barr virus (EBV) DNA was conducted in the tissues of 60 patients with nasopharyngeal carcinoma (NPC), 30 patients with chronic inflamation of nasopharyngeal mucous membrane and 40 patients with other malignant epithelial tumor respectively using DNA in situ hybridization method. The positive rate of EBV-DNA in patients of NPC was 71.6%, while it was negative in pat ents with other malignant tumors a small number of EB-VDNA positive cells were also discovered in the epithelial cells of paratumours and chronic inflamation of nasopharyngeal mucous membrane. Significant correlation was found in the study of serum EBV-antiby in patients of NPC and EBV-DNA in cancer cells. The results suggest that EBV may be of etiologic significance in the pathogenesis of NPC.

Objective:Study the relationship of HLA I and B7 1 to elucidate the role of costimulatory molecule on antigen presentation in immunological rejection.Methods:FCM was applied to detect the expression of B7 1 Then the cytotoxicity of PBML was observed before and after blocking the HLA I Results:The level of HLA I expression increased greatly(P

Objective: To prepare the conjugate of supcrantigen (SAg) staphylococcal enterotoxin A (SEA) and monoclonal antibody (McAb) against human hepatocellular carcinoma HAbl8 F(ab' )_(2) fragment and to investigate the anti-human hepatoma effect of peripheral blood mononuclear cells (PBMC) targeted by HAbl8 F(ab' )i-SEA. Methods: McAb HAbl8 was extracted and its F(ab' )_(2) fragment was prepared with papain; the conjugate HAblS F(ab' )_(2)-SEA was prepared with N-succinimidyl-3-(2-pyridyldithio) propionate (SPDP); eveny collected peak after purification was identified with gel chromatography; the activity of antibody in the conjugate was identified with immunohistocheinical ABC method; the anti-hepatoma effect of PBMC targeted by HAbl8 F(ab' )_(2)-SEA was observed with MTT method. Results: The conjugate HAbl8 F(ab' )_(2)-SEA was prepared successfully and it had obvious effect of targeting PBMC to kill hepatoma cells, and this effect is correlated positively with the dose of HAbl8 F(ab')_(2)-SEA. Control groups had no such effect. Conclusion: Targeting therapy of hepatoma with McAb-SAg conjugate might be a kind of hopeful model of hepatoma im-munotherapy.

Objective To compare the effects of paired associative stimulation (PAS) and repetitive transcranial magnetic stimulation (rTMS) on motor cortex excitability.Methods The baseline corticospinal excitability of the left hemispheres of 10 healthy subjects was measured in terms of resting motor threshold (RMT) and other indicators of motor evoked potentials (MEP).On the following day they received PAS composed of trascranial magnetic stimulation (TMS) to the motor cortex of the left hemisphere and electric stimulation (ES) of the median nerve contralateral to the motor cortex,with an interval of 10ms between the TMS and ES (termed PAS10).The PAS10 was delivered at a frequency of 0.05 Hz and an intensity of 120％ of the RMT,for a total of 90 pulses.The MEP amplitude,MEP latency and RMT were evaluated one minute after the stimulation.After the PAS intervention,an interval of one week was allowed to eliminate any effect of PAS on motor cortex excitability.Then rTMS was delivered to the subjects' left motor cortex at the same time of day at a frequency of 1 Hz and an intensity of 120％ of the RMT,for a total of 1000 pulses.MEP amplitude,MEP latency and RMT were evaluated one minute after the stimulation.The two interventions were compared in terms of MEP amplitude,MEP latency and RMT.Results The average MEP amplitude,MEP latency and RMT at baseline were (2.93 ± 0.99) mV,(20.97 ± 1.67) ms,and (46.06 ±5.32) ％,respectively.One minute after PAS10,the MEP amplitude,MEP latency and RMT were (1.14 ± 0.76) mV,(21.87 ± 1.09) ms and (52.06 ±4.20) ％,respectively.One minute after rTMS,the MEP amplitude and latency and the RMT were (2.24 ± 0.79) mV,(20.88 ± 1.94) ms,and (49.00 ± 4.54) ％,respectively.The differences in MEP amplitude,MEP latency and RMT pre-and post-intervention were (0.69 ± 0.10) mV,(0.09 ±0.05) ms and (3.94 ± 0.93) ％,respectively for rTMS.For PAS10 they were (1.83 ± 0.14) mV,(0.90 ± 0.26)ms and (6.00 ± 1.13)％,respectively.The differences in MEP amplitude decrease and MEP latency lengthening between the two stimulation protocols were significant,but the difference in RMT elevation was not.Conclusion Both PAS10 and low frequency rTMS suppressed motor cortex excitability,but the suppressive effect of PAS10 is more significant.

Objective To investigate the effects of paired associative stimulation (PAS) on the recovery of upper limb motor function in stroke patients,and to analyze the relationship between the change of motor cortex excitability in the contralesional hemisphere and the recovery of motor function in the affected upper limb.Methods Thirty hemiplegic stroke patients were divided randomly into a treatment group and a control group.Both groups were given routine rehabilitation therapy,but the treatment group also received PAS consisting of transcranial magnetic stimulation (TMS) of the intact motor cortex and electrical stimulation (ES) of the median nerve at the wrist of the intact arm with an interval of 10 ms between the TMS and ES (PAS10).The PAS10 was delivered at a frequency of 0.05 Hz and an intensity of 120％ the resting motor threshold (RMT),once daily for 30 minutes,five times a week for 4 weeks.Corticospinal excitability was measured using motor evoked potentials (MEP) and the RMT.The FuglMeyer upper limb assessment (FMA),Brunnstrom staging and the modified Barthel index (MBI) were also applied before and at the end of the 4 weeks of treatment.Correlation was sought between any changes in MEP amplitude,the RMT of the contralesional hemisphere and changes in the FMA results.Results Before the intervention there were no significant differences between the two groups in terms of any of the assessments.After 4 weeks of treatment,all the assessments had changed significantly compared to those before the treatment,but there were still no significant differences between the two groups in terms of any the assessments.After 4 weeks of treatment,the differences in MEP amplitude from the contra-lesional hemisphere and the differences in FMA scores were positively and significantly correlated with a correlation coefficient of r =0.431.The lesioned hemisphere was also positively correlated with the differences in FMA scores with a significant correlation coefficient of r =0.608.Conclusion PAS10 can facilitate the recovery of upper limb motor function.The change in motor cortex excitability of the contra-lesional hemisphere significantly correlates with functional recovery in the upper limb.

Aim To obtain the HCC cell lines which could coexpressed the B7.1 and SEA. Methods The positive clones expressing the B7.1 and SEA were screened by immunohistochemical staining. The amount of SEA in culture supernatant was detected by ELISA. Results HCC cell clones coexpressing B7.1 and SEA were obtained, and expression amount of SEA in culture supernatant reached 10～ 14× 10-8g/L. Conclusion The co-rec-ogenition immune effective system of SEA and B7.1 on HCC cells is established.

AIM To study if the activated T lymphocytes induced by hepatocellular carcinoma (HCC) rejection antigenic peptide SLIVHLNEV (mutant peptide of C met) pulsed dendritic cells (DCs) can provide protection against tumor challenge in nude mice HCC model and in vitro . METHODS SLIVHLNEV was eluted from HCC cell line HHCC by mild acid buffer and was identified by the mass spectrometry technique. SLIVHLNEV pulsed DCs isolated from HLA A2+ ruptured spleen were co cutured with isogeneic T lymphocytes. Cytotoxicity was tested using lactate dehydrogenase (LDH) release assay. The induced cytotoxic T lymphocytes (CTLs) were implanted into nude mice in order to protect them against transplanted HHCC tumor cells. The inhibition effect of CTLs on the growth of implanted tumor in nude mice was also observed. RESULTS The CTLs induced by SLIVHLNEV pulsed DCs had unique ability to kill HHCC tumor cells in vitro. They also protected the nude mice against the further challenge of HHCC tumor cells and inhibited the growth of implanted tumor. CONCLUSION DC based HCC rejection antigenic peptide SLIVHLNEV vaccine can induce powerful immune reaction both in nude mice HCC model and in vitro.