Research on electroencephalogram specifics in patients with schizophrenia under cognitive load / 生物医学工程学杂志

Cognitive impairment is one of the three primary symptoms of schizophrenic patients and shows important value in early detection and warning for high-risk individuals. To study the specifics of electroencephalogram (EEG) in patients with schizophrenia under the cognitive load, we collected EEG signals from 17 schizophrenic patients and 19 healthy controls, extracted signals of each band based on wavelet transform, calculated the characteristics of nonlinear dynamic and functional brain networks, and automatically classified the two groups of people by using a machine learning algorithm. Experimental results indicated that the correlation dimension and sample entropy showed significant differences in α, β, θ, and γ rhythm of the Fp1 and Fp2 electrodes between groups under the cognitive load. These results implied that the functional disruptions in the frontal lobe might be the important factors of cognitive impairments in schizophrenic patients. Further results of the automatic classification analysis indicated that the combination of nonlinear dynamics and functional brain network properties as the input characteristics of the classifier showed the best performance, with the accuracy of 76.77%, sensitivity of 72.09%, and specificity of 80.36%. The results of this study demonstrated that the combination of nonlinear dynamics and function brain network properties may be potential biomarkers for early screening and auxiliary diagnosis of schizophrenia.

Human umbilical cord-drived mesenchymal stem cells as vehicles of CD20 specific-TRAIL fusion protein against non-Hodgkin’ s lymphoma / 中国免疫学杂志

Objective:To study the therapeutic effect of a novel double-target system,in which human umbilical cord-derived MSCs were used as vehicles to deliver fusion protein scFvCD20:sTRAIL to non-Hodgkin ’ s lymphoma. Methods: The traditional methods in molecular biology were used to construct lentivirus expression vectors pLenR. scFvCD20: sTRAIL and contrast vectors. Human umbilical cord-derived MSCs ( HUMSCs ) were labeled with the copGFP by transducing with pseudo viral particles which had been packaged in 293T cells with four plasmid-lentivirus packaging system. Fusion protein scFvCD20:sTRAIL were secreted from MSC. scFvCD20:sTRAIL after that HUMSCs were infected by pseudo viral particles. CCK8 assay was applied to detect the antigen-restricted cell death induced by scFvCD20:sTRAIL in CD20-positive BJAB and Raji cells as well as CD20-negtive Jurkat cells and human normal peripheral blood mononuclear cells (PBMCs). To evaluate the therapeutic effect of MSC. scFvCD20:sTRAIL in vivo,ge-netically modified HUMSCs were intravenously injected into tumor-bearing mice with BJAB cells. The volume of tumor was measured every three days, and the inhibition ratio of tumor was calculated according to tumor volume. Results: Lentivirus expression vectors pLenR. scFvCD20:sTRAIL, pLenR. ISZ:sTRAIL, pLenR. scFvCD20 and pLenR. CopGFP were successfully constructed and these constructs could be expressed stably in HUMSCs by lentivirus transduction. scFvCD20:sTRAIL fusion protein produced a potent inhibition of cell proliferation in CD20-positive BJAB cells,moderate inhibition of the growth of Raji cells,and weak inhibition in CD20-negtive Jurkat cells when compared with ISZ-sTRAIL treatment,and it had no effect on normal human peripheral blood mononuclear cells (PBMCs). The MSC. scFvCD20:sTRAIL treatment significantly inhibited the tumor growth when compared with those treated with MSC. ISZ-sTRAIL. Conclusion: A double-target therapeutic system is well established, in which HUMSCs migrated to tumor site, secreted a novel fusion protein scFvCD20:sTRAIL,and thus locally concentrated scFvCD20:sTRAIL extended antigen-restricted anti-tumor activity. The engineered HUMSCs secreting scFvCD20:sTRAIL showed potent effect on inhibiting tumor growth in BJAB lymphoma malignancy,which may play an essential role in the clinical research .

Influence of sperm nucleoprotein transition on in vitro embryo development / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To correlate sperm nucleoprotein transition (SNT) with sperm morphology, DNA damage and embryo development, and assess its value for assisted reproductive technology (ART).</p><p><b>METHODS</b>The SNT of 437 infertile men underwent ART were assayed, and its correlation with sperm morphology, DNA damage, fertilization rate, normal fertilization rate, cleavage rate, available embryo rate, D3 high quality embryo rate, blastocyst formation rate and high quality blastocyst rate were analyzed.</p><p><b>RESULTS</b>The normal morphology rate of sperms, DNA damage, fertilization rate, normal fertilization rate, cleavage rate, embryo transfer rate (ETR), D3 high quality embryo rate, blastocyst formation rate (BFR) and high quality blastocyst in normal males (Group A, abnormal rate≤30%, 135 subjects) did not significantly differ from those with an abnormal rate between 30% and 60% (Group B, 170 subjects) (P>0.05). For those with an abnormal rate of above 60% (Group C, 132 subjects), the sperm normal morphology rate, DNA damage, normal fertilization rate, ETR, D3 high quality embryo rate, high quality blastocyst rate were significantly lower compared with Group A (P<0.01), while no significant difference was found in fertilization rate, cleavage rate and BFR between groups A and C (P>0.05).</p><p><b>CONCLUSION</b>SNT is related with sperm morphology rate, DNA damage and embryo development, and should be assessed before ART.</p>

Study of mechanism of indirubin derivative PHⅡ-7 in augmenting TRAIL-induced cytotoxicity in breast cancer cell line as well as its chemo-resistant counterpart / 中国药理学通报

Aim To investigate the effect of indirubin derivative PHⅡ-7 and TRAIL on proliferation in breast cancer cell MCF-7 and its MDR counterpart MCF-7/ADR and the mechanism.Methods Growth inhibition rate was examined respectively by MTT assay under treatment with TRAIL or PHⅡ-7 or in combination. Cell apoptosis and ROS production were examined by flow cytometry.The change of TRAIL receptors(DR4/DR5 )in mRNA was analysed by realtime PCR.Re-sults IC50 of PHⅡ-7 on MCF-7 and MCF-7/ADR was (4.49 ±1.55 ),(3.44 ±0.90 )μmol · L-1 respec-tively;MDA-MB-231 was TRAIL sensitive cell line, and apparently TRAIL induced apoptosis in MDA-MB-23 1 .Low concentration of PHⅡ-7 in combination with TRAIL could augment TRAIL-induced cytotoxic effect including apoptosis while TRAIL or PHⅡ-7 treatment alone had limited cytotoxity to those cells.Besides, PHⅡ-7 at this concentration had little toxicity to hu-man peripheral blood mononuclear cells even if in com-bination with TRAIL.PHⅡ-7 generated ROS produc-tion inside MCF-7 and MCF-7/ADR cells and up-regu-lated DR4/DR5 expression concentration dependently. Once upon ROS scavenger NAC involved,the effect of TRAIL receptors up-regualtion by expression was abro-gated.Conclusions PHⅡ-7 at low concentration could improve the sensitivities of breast cancer cell MCF-7 and MCF-7/ADR to TRAIL,the mechanism of which may be the ability of ROS production by PHⅡ-7 help up-regulated TRAIL receptor DR4,DR5 .Our re-search set a solid foundation for PHⅡ-7 in combination with TRAIL in future clinical application.

Targeting distribution of anti-CD19(Fab)-LDM:a new anti-lymphoma drug / 中国药理学通报

Aim To study targeting capability of anti-CD19 (Fab)-LDMto CD19 +B lymphoma cells in vi-vo and in vitro.Methods Flow cytometry was em-ployed to determine the affinity of Cy5 labeled anti-CD19 (Fab)-LDP to human lymphoma Raji cells.And the optical imaging system was used to analyze the dis-tribution of Cy5-anti-CD19 (Fab )-LDP in lymphoma-transplanted xenograft nude mice in vivo.Results The results of flow cytometry demonstrated that Cy5-an-ti-CD19(Fab)-LDP had remarkable affinity with lym-phoma Raji cells;Raji lymphoma xenograft model was established successfully in nude mice and in vivo fluo-rescence imaging analysis indicated that the antibody-drug conjugates could specially be localized in the tar-get tumor.Conclusion The experiments in vivo and vitro confirm that anti-CD19 (Fab)-LDP has remarka-ble affinity to targeting CD19 +lymphoma cells,and the antibody drugs anti-CD19 (Fab )-LDP have the probability to be new drugs for the treatment of malig-nant lymphoma.

The anti-apoptotic effect of c-fos in drug-resistant breast cancer cells / 中国癌症杂志

Background and purpose:Breast cancer is one of the most common carcinoma among female patients with high mortalities. Drug-resistance is the major reason that leads to chemotherapy failure in clinical practice. MCF-7/ADR is a multi-drug resistant cell line that was established on the basis of breast cancer cell line MCF-7. This research aimed to investigate the anti-apoptotic effect of c-fos in resistant breast cancer cell MCF-7/ADR, and to compare with its sensitive counterpart MCF-7.Methods:Doxorubicin with various concentrations was used to treat MCF-7 as well as its MDR- counterpart MCF-7/ADR. The growth inhibitory rate of MCF-7 and MCF-7/ADR wasdetermined by MTT assay. Additionally, RT-PCR was used to test the expression of P-gp and c-fos mRNA in MCF-7 and MCF-7/ADR; The expression of c-fos mRNA was detected by RT-PCR after 3 μmol doxorubicin treatment;We further established cell lines that stably interfered with c-fos, named MCF-7/ADR/si-fos-8B, MCF-7/ADR/si-fos-3D. Flow cytometry and MTT assay were used to investigate the apoptosis rate and inhibitory rate in these above cells under the treatment of 5-FU, CDDP or γ-radiation. At last, RT-PCR and Western blot analysis were used to detect the expression of bax, bcl-2, puma, p53.Results:The expression of c-fos and P-gp (MDR-1) was up-regulated in MCF-7/ADR, compared with its sensitive counterpart MCF-7. Additionally, the resistant fold of MCF-7/ADR to doxorubicin was nearly 40; The expression of c-fos was gradually up-regulated after 3 μmol doxorubicin treatment; The sensitivity to drugs (5-FU and CDDP) was increased after c-fos interference while the apoptosis rate was also increased after 5-FU, CDDP and γ-radiation treatment. RT-PCR and Western blot analysis indicated that up-regulation ofbax,puma,p53 after c-fos interference while the expression of bcl-2 was down-regulated.Conclusion:c-fos may act as an anti-apoptotic protein in resistant breast cancer cell line MCF-7/ADR by regulating the expression of apoptosis related proteins, and may play a vital role in the formation of multi-drug resistance phenotype.

Effect of energized fusion protein anti-CD2o (Fab)-LDM on proliferation and DNA damage of human lymphoma cell line BJAB / 白血病·淋巴瘤

Objective To investigate the growth inhibition and DNA damage of energized fusion protein anti-CD20(Fab)-LDM on B JAB cells in vitro.Methods The binding activity of fusion protein anti-CD20 (Fab)-LDP to B JAB cells was studied by flow cytometry and confocal laser scanning microscopy.MTT assay was used to study the energized fusion protein anti-CD20(Fab)-LDM on cell growth of B JAB cells.Comet assay was employed to detect DNA damage in B JAB cells.The cell growth cycle of BJAB was analyzed by FACS.Results The recombinant fusion protein anti-CD20 (Fab)-LDP possessed an significant target affinity towarded BJAB cells.The energized fusion protein anti-CD20(Fab)-LDM showed obvious inhibition on proliferation,as well as induced potent DNA damage in B JAB cells in vitro compared with lidamycin.B JAB cells treated with energized fusion protein anti-CD20 (Fab)-LDM showed S phase cell cycle.Conclusion The energized fusion protein anti-CD20 (Fab)-LDM could target binding to BJAB cells and significantly inhibit the proliferation of B JAB cells by inducing DNA damage and S phase arrest.

PSF/SFPQ relocated on cell membrane in hematologic neoplasia, a potential MDR target of hematologic tumors / 白血病·淋巴瘤

Objective To identify multidrug resistance (MDR) associated cell surface antigen in hematologic neoplasia and to investigate the universality of membrane-relocated expression of this antigen in hematologic neoplasia.Methods The membrane antigen was isolated and precipitated by SDS-PAGE and co-immunoprecipitation (co-IP),then was identified by mass spectrum (MS).Specific siRNA was used to interfere with gene expression,laser confocal microsopy was used to validate the results involved in antigen information.FACS was performed to analyse relocated expression of the antigen in hematologic neoplasia.Results Co-IP and MS show that a nuclear factor PSF was the antigen of 5D12,a leukemia-MDR associated McAb,and this antigen could relocate on HL-60 cell membrane.A series of experiences further confirmed that PSF overexpressed on HL-60 cell membrane compared with HL-60/ADR.The binding percentages of 5D12 to many hematologic tumor cells were observed,HL-60 (78.56±0.76) ％,K562 (26.54±4.42) ％,Nomalwa (38.10±5.11) ％,U937 (64.03±7.96) ％,Jurkat (29.12±5.58) ％,Raji (74.92±3.41) ％,CEM (12.18±3.21) ％.Conclusion Nuclear protein,PSF relocalizes on cell surfaces in hematologic tumor cells and contributes to cell sensitivity.PSF is a potential target of MDR prediction in hematologic neoplasia.

Study on predicting model for acute hypotensive episodes in ICU based on support vector machine / 生物医学工程学杂志

The occurrence of acute hypotensive episodes (AHE) in intensive care units (ICU) seriously endangers the lives of patients, and the treatment is mainly depended on the expert experience of doctors. In this paper, a model for predicting the occurrence of AHE in ICU has been developed using the theory of medical Informatics. We analyzed the trend and characteristics of the mean arterial blood pressure (MAP) between the patients who were suffering AHE and those who were not, and extracted the median, mean and other statistical parameters for learning and training based on support vector machine (SVM), then developed a predicting model. On this basis, we also compared different models consisted of different kernel functions. Experiments demonstrated that this approach performed well on classification and prediction, which would contribute to forecast the occurrence of AHE.

Reform of Graduation Project,Cultivating Innovative Talents / 中国医学物理学杂志

Graduation project is key link in the cultivation of innovative talents for college teaching work,which is the need of the era.Thus,this paper introduced the current development of biomedical engineering at home and abroad,and the achievement of the graduation project of our university at present.Then,the necessity of the teaching reform and innovation of graduation project are analyzed.The methods for the teaching reform and innovation of graduation project are introduced including the choice of projects,the adjustment of the project schedule,reinforcing the practice of projects and improving the ability to apply knowledge,the assessment criteria of grades for the project,etc.

Production of discrepant monoclonal antibody against HL60 and HL60/ADR by SI technique / 中国免疫学杂志

Objective:To prepare and characterize specific and discrepant mouse hybridoma antibodies on membrane of HL60 and HL60/ADR cell lines.Methods:BALB/c mice were immunized by subtractive immunization induced Cp(Cyclophosphamide).McAbs were prepared by hybridoma technique,screened and detected by FACS and LSCM.Results:51 candidates and discrepant antibodies were found,and one of them (5F6) was purified and identified.Conclusion:Combination of SI with discrepant screening method should facilitate the preparing and identifying discrepant McAbs for identifying antibodies that can distinguish the differences in proteins expressed in HL60 and HL60/ADR,which is a significative and potential method in the research and target therapy associated drug-resistance.

Effect of VEGF-C Gene Transfection on the Expression of VEGF-C in Human Cervical Carcinoma HeLa Cells and the Molecular Meehnisms of Its Anti-apoptosis Effect / 中国肿瘤临床

Objective: TO explore the effect of VEGF-C gene transfection on the expression of VEGF-C in human cervical carcinoma HeLa cells and the mechanisms of its anti-apoptosis effect. Methods: The con-structed pcDNA3.1(+)NEGF-C vector was transformed into human cervical cancer HeLa cells and was select-ed by G418. The changes in the expression level of VEGF-C mRNA and protein were determined by semi-quantitive RT-PCR and ELISA. HeLa cells with overexpression of VEGF-C were named as HeLa/S1. The expression level of NF-KB and bcl-2 mRNA was determined by RT-PCR in transfected cells. Results: After transfection by liposome, the VEGF-C mRNA level and the expression of VEGF-C protein in transfected cells were higher than those in the control groups. HeLa/S1 cell line was successfully established. In HeLa/S1 cells, the expression of NF-κB (2.06±0.09 vs 1.35±0.02 vs 1.38±0.02 P<0.05) and bcl-2 gene mRNA (2.02± 0.67 vs 0.41±0.06 vs 0.37±0.06, P<0.05) level were higher than those in the control groups. Conclusion: VEGF-C gene transfection by liposome can increase the expression of VEGF-C in human cervical cancer HeLa cells. NF-κB is stimulated and induces the overexpression of bcl-2 gene in HeLa/S1 cells.

Construction,expression and in vitro specific killing activity of a recombinant fusion protein:anti-CD20Fab-LDM / 中国药理学通报

Aim To construct and express anti-CD20Fab-LDP,generate anti-CD20Fab-LDM and identify its biological activity.Methods PCR and overlapping PCR were used to construct anti-CD20Fab-LDP.DNA sequence was analyzed by the Terminus of Dideoxy Nucleotide.The product was purified by affinity chromatography and analyzed by Western blot and its antigen-binding activity was examined by FACS.Specific killing activity in vitro of anti-CD20Fab-LDM was analyzed by MTT.Results The data of DNA sequence showed that anti-CD20Fab-LDP was correct.The fusion protein was recovered in high yield(up to 4 mg·L~(-1))after proteinG purification.The fusion protein could bind to Raji cells(CD20+),and similar affinity data were obtained with anti-CD20Fab.Anti-CD20Fab-LDP showed potent cytotoxicity to Raji cells with IC_(50) values of 0.9×10~(-10) mol·L~(-1).Conclusions Anti-CD20Fab-LDP with high level expression was successfully obtained and could bind to Raji cells cells.Anti-CD20Fab-LDM showed specific killing activity to Raji cells in vitro.

A Design of Multi-parameter Smartphone Monitoring Interface Based on J2ME / 中国医学物理学杂志

Purpose: This paper introduces a design of wearable multi-parameter emluator experiment smartphone monitoring interface based on J2ME. Methods: The system carries in simulated environment of Wireless Toolkit, and the remote monitoring of multiple physiological parameters is implemented with wearable detecting technology and GPRS. Results: The system can measure real-time data such as ECG, heart rate, blood pressure, body temperature and oxygen saturation, which can also analyse the data automatically and possess warning functions. At last, the system can send parameters to intelligent handheld devices, and can establish communication with medical service center. Conclusions: The experimental result of simulation shows that the system has the excellence of transplantable, simpleness and quick speed of response. It shows that the system is expected to realize the important application of medicine in 3G era and to provide a basis for further research in telemedicine.

Soluble-expression, purification and activity analysis of extracellular domain III of flt1 / 生物工程学报

To prepare a soluble human extracellular III domain of Flt1 and analyze its biological activity. The gene encoding extracellular domain III of Flt-1 was cloned into the expression vector pAZY by RT-PCR from human umbilical vein endothelial cell (HUVEC), and induced to express in Escherichia coli by low phosphoric medium, the product was purified by E-tag affinity chromatography. SDS-PAGE and Western blotting analysis showed that Flt-1 gene domain III gene was expressed in E. coli and the yield of the soluble fusion protein was about 1.10 mg/L. Enzyme-Linked ImmunoSorbent Assay (ELISA) revealed that the Flt-1 domain III was able to bind to VEGF165 dose-dependently. Monolayer denudation assay and Transwell assay showed that the fusion protein could inhibit HUVECs migration induced by conditional medium with 50 ng/mL VEGF165 and 100 ng/mL bFGF. In conclusion, Flt-1 gene domain III gene has been successfully cloned and expressed in E. coli, which will be useful in both the research on the function of Flt-1 gene domain III and preparation of anti-Flt-1 monoclonal antibody in the future.

Construction and expression of disulphide stabilized anti-CD3/anti-Pgp diabody / 生物工程学报

We constructed and expressed an anti-CD3/anti-Pgp (P-glycoprotein) diabody previously. However, the two chains of diabody are associated non-covalently, resulting in being capable of dissociating. The aim of this study is to enhance the stability of the diabody. We introduced cysteine residues into the CD3 or Pgp V-domain to covalently lock the two chains together. The disulphide crosslinked diabody were expressed by Escherichia coli (E. coli) 16C9 and purified by a cation exchange column and an anti-Etag affinity chromatography. The purified proteins were verified through SDS-PAGE. Flow cytometry (FCM) was used to analyse the binding properties, competitive binding capacity and stability in vitro. The dsPpg-diabody failed to form disulphide bond properly. The designed disulphide bridge between the different chains of dsCD3-diabody was formed correctly. FCM demonstrated the dsCD3-diabody has specific antigen binding activity, the same binding activity and competitive binding activity as its parent diabody. The dsCD3-diabody retained the full activity even after 72 h incubation at 37 degrees C in human serum, in contrast, the parent diabody began to lose activity after only 1 h and lose all its activity 24 hours later. The induced disulphide bond in the CD3 V-domain effectively enhanced the stability of anti-CD3/anti-Pgp diabody. The method of stabilizing a diabody by introducing a disulphide bond into is practical.

Study on the construction and expression of the human 4-1BBL extracellular domain/anti-CD20 Fab' fusion protein / 生物工程学报

Several studies have demonstrated the role of 4-1BBL in T cell activation. Furthermore, enhanced 4-1BB/4-1BBL interaction has been shown to amplify T-cell-mediated antitumor immunity in several mouse models. However, when applied in humans, it was difficult to generate sufficient T cells ex vivo and whole cell vaccines to transfer back into patients. To overcome this difficulty, we have focused on producing the human 4-1BBL extracellular domain/anti-CD20 Fab' fusion protein. In this report, PCR and overlap PCR were used to construct the human 4-1BBL extracellular domain/anti-CD20 Fab' expression vector. DNA sequence was analyzed by the Terminus of Dideoxy Nucleotide. The product was purified by affinity chromatography and analyzed by SDS-PAGE and HPLC; its antigen binding activity was examined by rosetting assay. The data of DNA sequence showed that the human 4-1BBL extracellular domain/anti-CD20 Fab' fusion protein was corrected. The fusion protein was recovered in high yield (up to 200 microg/mL) after E-taq purification. The fusion protein was capable of simultaneous binding to stimulated Jurkat cells and Raji cells as shown by cellular rosetting. In conclusion, the human 4-1BBL extracellular domain/anti-CD20 Fab' fusion protein was induced to express in E. coli 16C9. The results of some biological activity experiments indicated that the fusion protein could bind to stimulated Jurkat cells and Raji cells. Furthermore, 4-1BBL-negative tumors can be converted into 4-1BBL-positive tumors by the fusion protein without the need for 4-1BBL gene transfer to the malignant cells.

Design and discovery of novel small-molecule inhibitor of CDK9 / 中国药理学通报

Aim To look for novel small-molecule inhibitors of CDK9 through structure-based virtual screening and biological activity determination.Methods Homology modeling of CDK9 was based on the 3-D structure of other cyclin-dependent kinase family members,and then virtual screening by DOCK(molecular docking)of database of small molecule was carried on.MTT method was used in inhibition of tumor cell growth in vitro,while Western blot was used for further study of molecular mechanisms.Results From the top 1000 compounds with the best DOCK energy score,27 compounds were selected for biological assay based on the diversity of chemical structure and functional group.12 of 27 selected compounds showed significantly inhibition activity on tumor cell proliferation,and only one compound in 12 with half-maximum inhibition concentration(IC50)values less than 20 ?mol?L-1 named C-21 was selected for further molecular mechanism study.The western blotting data showed C-21 compound could effectively inhibit CDK9 from phosphorylating large subunit C-terminal of RNA polymerase Ⅱ in a dose-dependent manner.Conclusions Through homology modeling,virtual screening by computer,determination of biological activity and experimental studies of molecular mechanism,a new promising lead compound targeted for CDK9 was found and confirmed.

Discussion on teaching mode of basic medical knowledge for Biomedical Engineering students in science and technology college / 医疗卫生装备

In order to lay a solid medical foundation for Biomedical Engineering students,the basic medical knowledge teaching for Biomedical Engineering in science and technology college should highlight its specialties and closely follow its professional training direction.This thesis discusses the specialties,aims and its realizing methods for basic medical knowledge teaching of Biomedical Engineering in science and technology college.

Study on the construction and expression of anti-CD3/anti-CD20 Diabody / 中国免疫学杂志

Objective:To construct and express anti CD3/anti CD20 Diabody and identify its biological activity.Methods:PCR and overlap PCR were used to construct anti CD3/anti CD20 Diabody.DNA sequence was analyzed by the Terminus of Dideoxy Nucleotide.The product was purified by affinity chromatography and analyzed by both the detection of Western blot and size exclusion chromatography;its antigen binding activity was examined by FACS and rosetting assay.Results:The data of DNA sequence showed that the anti CD3/anti CD20 Diabody was corrected.The Diabody was recovered in high yield(up to 1 mg/ml) after E taq purification and predominantly(90%) as a dimer.The Diabody binded Jurkat cells(CD3 +) and Daudi cells (CD20 +),respectively.Furthermore,the Diabody was capable of simultaneous binding to Jurkat cells and Daudi cells as shown by cellular rosetting.Conclusion:The anti CD3/anti CD20 BsF(ab') 2 was first recast into the Diabody format and succeeded to obtain high level expression.The results of some biological activity experiments indicated that the Diabody could bind to Jurkat cells and Daudi cells.