Clinical study of human cytomegalovirus infection in colony forming unit-megakaryocyte in patients with idiopathic thrombocytopenic purpura / 中华儿科杂志

<p><b>OBJECTIVE</b>Idiopathic thrombocytopenic purpura (ITP) is a hemorrhagic disease in children with blood platelets redundant destruction caused by chaotic immunological mechanism. However, some patients with ITP with negative platelet-associated antibody and ineffective adrenal cortical hormone therapy probably have special pathogenesis. It is indicated that the human cytomegalovirus (HCMV) can incubate in haemopoietic stem cell/ancestral cell to inhibit its generation and differentiation. Therefore, the study was designed to investigate HCMV-late mRNA expression in megakaryoblast for the purpose of examining the pathogenesis of ITP and to examine the effectiveness of ganciclovir on ITP.</p><p><b>METHODS</b>Colony forming unit-megakaryocyte (CFU-MK) of 46 ITP patients with HCMV infection were incubated. Reverse transcription-polymerase chain reaction (RT-PCR) was subsequently used for HCMV-late mRNA detection. Ganciclovir therapy was given to both positive group and negative group for comparison of therapeutic effectiveness.</p><p><b>RESULTS</b>Nineteen out of 46 CFU-MK culture cell specimens with positive HCMV-DNA by PCR or positive CMV-IgM by enzyme linked immunosorbent assay (ELISA) from serum of peripheral blood showed positive for HCMV-late mRNA. While, the remaining 27 were negative. Sixteen positive responders to ganciclovir therapy were observed amongst those with positive HCMV-DNA. Whereas, only 4 positive responders to ganciclovir therapy were noticed amongst those with negative HCMV-DNA. The curative effectiveness in positive group was significantly higher than that in negative group (P < 0.01).</p><p><b>CONCLUSION</b>HCMV can directly infect CFU-MK, which might be one of the mechanisms responsible for ITP. Ganciclovir is an effective therapy resulting in an increase in thrombocyte in ITP patients whose HCMV-late mRNA was positive in their CFU-MK.</p>

Changes of Plasma Brain Natriuretic Peptide Concentration Induced Therapy by Daunorubicin and Its Clinical Significance in Children with Acute Leukemia / 实用儿科临床杂志

Objective To explore the clinical significance of the brain natriuretic peptide(BNP) in evaluating the cardiotoxicity caused by daunorubicin(DNR) through studying the changes of the plasma BNP levels in children with acute leukemia who accepted the chemotherapy with DNR.Methods Thirty-one children with acute lymphoblastic leukemia(ALL) admitted in the year of 2002-2004 underwent the chemotherapy in DVLP project.The plasma level of BNP was measured by enzyme linked immunosorbent assay(ELISA) and the left ventricular end diastolic diameter(LVEDD) by color Doppler respectively before and after the administration of DNR.Simultaneously,electrocardiography(ECG) and cardiac muscle enzymes(LDH1,CK-MB) were measured as routine.Results The plasma level of BNP increased from(3.97?2.41) ng/L to(18.25?7.63) ng/L(P

MAPK signal pathway plays a role in proliferation of Jurkat cells induced by ouabain / 中国实验血液学杂志

The object was to study the effect of ouabain on Jurkat cells and its possible mechanism. The effect of ouabain of low concentration on Jurkat cells was confirmed by MTT, while c-myc gene transcription was measured by RT-PCR, and the phosphorylation of MAPK (ERK1/2) as well as the expression of c-myc gene was tested by Western blot respectively. The results showed that ouabain at low concentration could induce the proliferation of Jurkat in a time-and dose-dependent manner. At the same time, the phosphorylation of MAPK (ERK1/2) and the expression of c-myc gene was enhanced. In conclusion, ouabain stimulates the intracellular MAPK signal pathway by acting on the Na, K-ATPase, and thus induce the proliferation of Jurkat cells, in which the regulation of c-myc gene expression may be involved.