Clinical observation of desmopressin in the treatment of 15 patients with DDAVP / 中华血液学杂志

Objective@#To assess the significance of DDAVP use in the diagnosis and treatment of VWD.@*Methods@#An analysis of 15 VWD cases who referred to Hematology Division of First affiliated Hospital of Soochow University and treated with DDAVP from March 2016 to August 2018 was conducted. Efficacy and treatment response of DDAVP were monitored by observations of changes in factor Ⅷ procoagulant (FⅧ∶C) and von Willebrand Factor (VWF) related indicators before and 2 h after DDAVP injection.@*Results@#Of 15 cases with VWD, 7 males and 8 females with a median age of 23 (6-46) years, 7 of 9 type I VWD patients achieved complete response (CR) , 1 type 2A VWD case CR, 5 type 3 VWD ones no response (NR) . The VWF multimer analysis in 5 patients combined with other plasma VWF values were in accordance with the known diagnosis.@*Conclusions@#DDAVP was effective in most type 1 patients, and ineffective in some type 2 and almost all type 3 cases. It was helpful for diagnosis and subsequent treatment planning.

Clinical studies of 162 patients with von Willebrand disease / 中华血液学杂志

<p><b>OBJECTIVE</b>To analyse the epidemiological feature, clinical characters and therapeutic regimens for von Willebrand disease(VWD).</p><p><b>METHODS</b>The clinical data and laboratory tests results of 162 VWD patients in our center were analyzed.</p><p><b>RESULTS</b>There were 76 males and 86 female among these patients with the mean age of 7.2(2.0-41.0) and 20.7(5.0-48.0) years, respectively. 86 patients (53.1%) were identified to be type 1 VWD, 34 patients (21.0%) type 3 VWD and 42 patients (25.9%) type 2 VWD. Among type 2 VWD patients, 33 patients were type 2A, 4 patients type 2M, 5 patients type 2B. Eighty-seven patients (53.7%) had a definite family history of bleeding tendency. The most common and specific bleeding symptoms were easy bruising (61.7%), epistaxis (53.7%), prolonged bleeding after surgery or minor injury (53.1%). Menorrhagia (66.3%) was common in female patients. The analysis of Vicenza bleeding scores in all patients showed that only 56(34.6%) patients had abnormal bleeding scores. FVIII/VWF concentrates and cryoprecipitate were applied to 45 patients (27.8% ), Desmopressin (DDAVP) to 8 patients. Eight female patients need oral contraceptives jointly to control menorrhagia. Hysterectomy had to be performed in 2 female patients with VWD.</p><p><b>CONCLUSION</b>VWD was a common congenital bleeding disorder with heterogeneous characters, it was necessary to screen, identify, classify accurately this disease in order to supply to effectively individualized treatment.</p>

The value of anti-von Willebrand factor antibody in the mechanism of idiopathic thrombotic thrombocytopenic purpura / 中华检验医学杂志

Objective This study is aimed at determining whether anti-von Willebrand factor (VWF) autoantibodies are present in the plasma of idiopathic thrombotic thrombocytopenic purpura (TTP) patients with normal ADAMTS13 activity and undetectable anti-ADAMTS13 antibodies,and at examining whether murine monoclonal antibodies (mAbs) against human VWF decrease the susceptibility of VWF to ADAMTS13 in vitro.Methods Anti-VWF autoantibodies and ultralarge VWF (UL-VWF) multimers were measured in plasma samples of 53 adult patients with idiopathic TTP by enzyme-linked immunosorbent assay and sodium dodecylsulphate-agarose gel electrophoresis,respectively.Moreover,the effects of eight murine mAbs to different human VWF domains on VWF cleavage by ADAMTS13 were evaluated under fluid shear stress and static/denaturing conditions,respectively.Results Anti-VWF antibodies and UL-VWF multimers were detected in two TTP patients with normal ADAMTS13 activity and undetectable anti-ADAMTS13antibodies.The SZ34,an anti-VWF mAb,inhibited VWF proteolysis mediated by ADAMTS13 under flow,but not static conditions.Conclusion Anti-VWF antibody may be one of the causes of idiopathic TTP with normal ADAMTS13 activity and undetectable anti-ADAMTS13 antibodies.

Selection of the most effective small interfering RNA which inhibits the expression of TLR4 in microglial cells and detection of the cytotoxicity of transfection complex / 中国药理学通报

Aim To pick out the siRNA which could most effectively inhibit the expression of TLR4 in microglial cells and to detect the cytotoxicity of the transfection complex.Methods Five siRNAs were chemicaly synthesized:four of them were used to inhibit TLR4 expression in microglial cells,the rest was fluorescence-labeled mismatch siRNA as a nagative control.They were all transfected into microglial cells,respectively.TLR4 mRNA was detected 24 h after transfection by RT-PCR and its protein expression wasobserved by Western blot 48 h later.The cytotoxicity of complex was detected using MTT.Results ① The transfection rate was high enough in microglial cells with siRNA(40 pmol)and LipofectamineTM 2000(1 μl).② The TLR4 siRNA pool reduced TLR4 mRNA by 85%(siRNA_(439)),73%(siRNA_(312)),67%(siRNA_(1495))and 33%(siRNA_(2062))respectively compared with mismatch siRNA-treated group 24 h after transfection in a microglial cell line.③ The TLR4 siRNA439 was the most effective siRNA(P<0.01).④ The cell survival rates were above 85% in the groups of Lipofectamine~(TM) 2000 1 μl compound less than 40 nmol·L~(-1) siRNA.Conclusions ① The TLR4 siRNA_(439) can inhibit TLR4 expression most effectively in microglial.② 40 nmol·L~(-1) siRNA and 1 μl Lipofectamine~(TM) 2000 have low cytotoxicity,which are suitable for transfection.

Changes in expression of NF-κB, IL-6 and TNF-α in spinal cord in a rat model of bone cancer pain / 中华麻醉学杂志

Objective To evaluate the changes in expression of NF-κB, IL-6 and TNF-α in spinal cord in a rat model of bone cancer. Methods Seventy-two female SD rats weighing 150-180 g were randomly divided into 3 groups (n = 24 each): control group (group C);sham operation group (group S) and bone cancer pain group (group BP). Bone cancer was induced by intra-tibial inoculation of 1 × 105 Walker 256 breast cancer cells. Paw withdrawal threshold to mechanical stimulation was measured with yon Frey filaments. The expression of NF-κB p65, IL-6 and TNF-α mRNA in the spinal cord was determined by RT-PCR and the expression of NF-κB p65 by immuno-histochemistry and NF-κB p65 positive cell count was determined. Results The paw withdrawal threshold was significantly lower and the expression of NF-κB p65, NF-κB p65 mRNA, IL-6 mRNA, TNF-α mRNA and NF-κB p65 positive cell count in the spinal cord were significantly higher in group BP than in group C and S ( P ＜0.05 or 0.01 ). Conclusion Intra-tibial inoculation of Walker 256 breast cancer cells activates NF-κB in the spinal cord, leading to the increased release of IL-6 and TNF-α and mechanical hyperalgesia.

Stable expression and characterization of the von Willebrand factor cleaving protease / 生物工程学报

This study was to acquire recombinant protein of von Willebrand factor cleaving protease (ADAMTS13, a disintegrin and metalloprotease with a thromboSpondin type 1 motifs 13), for further studies on its biological function in thrombosis and hemostasis. We transfected the Hela cells with the plasmid pSecTag-ADAMTS13 by lipofectamine. A positive cell cloning was selected by hygromycin-B. The recombinant protein was purified with Ni-NTA agarose column by gradient imidazole. The purity and immune activity of purified products were identified with SDS-PAGE and Western blotting respectively. We also measured the enzymatic activity of recombinant protein (rADAMTS13) by GST-His two-site ELISA assay. The results showed that we successfully constructed Hela cells ADAMTS2-4 which expressed high level of rADAMTS13. We received about 5.8 mg recombinant protein in culture supernantants per liter purified with Ni-NTA column. The protein formed a main lane at the position of 190 kDa with SDS-PAGE and reacted with polyclonal antibody against ADAMTS13 by Western blotting. The amount of rADAMTS13 activity was 6.4 U/mL, according to the normal plasma defined as 1 U/mL. In conclusion, rADAMTS13 protein had high purity, immune activity and good enzymatic activity, which could establish the experimental foundation for further research on biological function and mechanism of this unique metalloprotease.

Effects of oxidized high density lipoprotein on tissue factor expression in ECV304 cell line / 中国病理生理杂志

AIM: To investigate the expression of tissue factor(TF) induced by oxidized high density lipoprotein(oxHDL) in human umbilical vein cell line,ECV304,and the related mechanisms.METHODS: Four main groups were designed: the negative,the positive(ECV304 with histamine),the HDL group and the oxHDL group.Quantitative real-time polymerase chain reaction(RQ-PCR) and Western blotting were used to detect the expression level of TF.The specific inhibitors of MAPKs,SP600125(c-jun terminal NH2 kinase,JNK),SB203580(p38 MAP kinase,p38 MAPK),PD98059(extracellular signal-regulated kinase,ERK1/2) were used to investigate the underlying mechanisms.RESULTS: The TF expression in normal ECV304 cell line was not detected.Histamine administration resulted in a significant expression of TF in ECV304 cell line,with strongest effect after 1 h co-incubation at concentration of 1?10-5 mol/L histamine(about 4.8-fold higher expression of TF compared with that of 1?10-9 mol/L histamine).Expression level of TF was detected after stimulated with oxHDL in dose-and time-dependent manners.The highest expression of TF mRNA was found at 20 mg/L oxHDL and 6 h co-incubation,with 1.8-fold and 5.3-fold increase in TF expression,respectively,compared with that at 10 mg/L oxHDL and 2 h co-incubation.20 mg/L oxHDL also caused an apparent augmentation of TF protein expression,about 1.5-fold higher compared with that stimulated by 40 mg/L oxHDL.HDL co-incubation did not cause a detectable expression of TF protein.The mRNA levels of TF in ECV304 cell line induced by oxHDL were decreased by 95.0%,81.0%,87.0%,respectively(all P