Résumé
The aim of this study was to find platelet specific autoantibodies against glycoproteins in myelodysplastic syndrome (MDS) and to explore its role in pathogenesis of MDS. The plasma autoantibodies against GP IIb/IIIa and GP Ib/IX were measured by using a modified monoclonal antibody specific immobolization platelet antigens assay (MAIPA). Absorbance greater than mean value plus tripled standard deviation recorded from the normal controls were regarded as positive. The results indicated that the total positive rate in patients with MDS was 16.67% (5/30), the total positive rate in patients with ITP was 46.67% (14/30), the difference between MDS group and ITP group was significant (P < 0.05). It is concluded that partial patients with MDS have plasma specific autoantibodies against platelet GP II b/III a and GP Ib/IX, indicating correlation of thrombocytopenia of patients with immune factors and the autoantibody-mediated platelet destruction may be involved in the pathogenesis of MDS. It provides a new basis for immunosuppression therapy for MDS.
Sujets)
Adolescent , Adulte , Sujet âgé , Femelle , Humains , Mâle , Adulte d'âge moyen , Anticorps , Allergie et immunologie , Antigènes plaquettaires humains , Allergie et immunologie , Autoanticorps , Allergie et immunologie , Syndromes myélodysplasiques , Allergie et immunologie , Complexe glycoprotéique IIb-IIIa de la membrane plaquettaire , Allergie et immunologie , Complexe glycoprotéique GPIb-IX plaquettaire , Allergie et immunologie , Thrombopénie , Allergie et immunologieRésumé
<p><b>OBJECTIVE</b>To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism.</p><p><b>METHODS</b>HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred.</p><p><b>RESULTS</b>Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin.</p><p><b>CONCLUSIONS</b>Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.</p>
Sujets)
Humains , Antinéoplasiques d'origine végétale , Pharmacologie , Apoptose , Division cellulaire , Diterpènes , Pharmacologie , Diterpènes de type kaurane , Cellules HL-60 , Isodon , Chimie , Plantes médicinales , Chimie , Telomerase , MétabolismeRésumé
<p><b>OBJECTIVE</b>To observe the antileukemic effect of lymphocytes from cord blood treated by CpG-oligodeoxynucleotides (CpG-ODN).</p><p><b>METHODS</b>Lymphocytes from cord blood were exposed to different oligodeoxynucleotides containing a panel of CpG-ODN and were cultured with K562 cells. The cytotoxic effects were detected by MTT method. Immunological markers of cord blood treated by CpG-ODN(3) which showed highest activity were measured with flow cytometry.</p><p><b>RESULTS</b>Different CpG-motifs have different immunostimulatory activity and CpG-ODN(3) has the highest one. After treated by CpG-ODN(3), NK killing activity to K562 cells increased in a dose-dependent manner, and CD(3), CD(4), CD(19) and CD(56) increased to (60.6 +/- 7.9)%, (40.2 +/- 3.5)%, (22.4 +/- 1.9)% and (15.5 +/- 3.1)%, respectively.</p><p><b>CONCLUSION</b>CpG-ODN could reinforces the immunological competence of cord blood lymphocytes and their effects on K562 cells. This provides a new approach to reinforce the antitumor effects of cord blood.</p>
Sujets)
Humains , Adjuvants immunologiques , Pharmacologie , Antigènes CD , Sang , Cytotoxicité immunologique , Relation dose-effet des médicaments , Sang foetal , Biologie cellulaire , Cellules K562 , Leucémies , Thérapeutique , Lymphocytes , Allergie et immunologie , Oligodésoxyribonucléotides , Pharmacologie , RT-PCRRésumé
<p><b>OBJECTIVE</b>To study the related proteins of apoptosis initiation induced by homoharringtonine (HHT) in HL-60 cells.</p><p><b>METHODS</b>After establishment of an apoptosis initiation model induced by HHT in HL-60 cells, proteins of untreated and HHT treated HL-60 cells were extracted, and the two-dimensional polyacrylamide gel electrophoresis (2-DE) maps of the extracted proteins were established by using the immobilized pH gradient (IPG) two-dimensional electrophoresis respectively. The alteration protein spots were identified with assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and database searching.</p><p><b>RESULTS</b>Proteomics analysis showed that proteins including MHC class I antigen, calbindin D-28K, chloride channel protein 6, oncoprotein 18, zinc finger protein Helios and apoptosis inhibitor like protein 2 were involved in apoptosis initiation induced by HHT.</p><p><b>CONCLUSION</b>The present study might conduce to the researches of HL-60 cells carcinogenesis and pave the way to exploit drug precursor related to HHT and initiation of apoptosis in HL-60 cells.</p>