The molecular mechanism of two-component system of MprAB and TrcRS in synergistically regulating gene rv1057 expression of Mycobacterium tuberculosis / 中华传染病杂志

Objective To study the mechanism of two-component system of MprAB and TrcRS in synergistically regulating gene rv1057 expression of Mycobacterium tuberculosis.Methods The in vivo specific binding capability of MprA and TrcR with the target gene promoter region was analyzed using electrophoretic mobility shift assay.The transcription level of target gene was analyzed by using fluorescence quantitative polymerase chain reaction,and all results were compared with the fold changes in H37Rv strain plus SDS group,which was set as one unit.The expression level of target gene was analyzed by using western blot;the transcription ability of different promoter region of rv1057 was detected through lacZ report gene.The t test was used for statistical analysis.Results MprA was able to bind to trcR promoter.The expressions of trcR in D981 and H37Rv strains without SDS were 1.7 and 2.5 folds of the expression of H37Rv strains with SDS groups,respectively.The difference between these two groups was statistically significant (t=18.54,P＜0.05).With SDS,the expressions of trcR in D981 and H37Rv strains were 1.0 and 2.1 folds of the expression of H37Rv strains plus SDS group,respectively.The expressions of trcR in D981 and H37Rv strains were significantly different (t=15.86,P＜0.05).After adding SDS during the culture of H37Rv strains,the expression of trcR in H37Rv decreased.The difference between these two groups was statistically significant (t=16.99,P＜0.05).Both MprA and TrcR were able to bind to rv1057 promoter and regulate its expression.MprA activated the expression of rv1057,while TrcR repressed the expression of rv1057.Conclusions MprAB and TrcRS synergistically regulate the expression of rv1057.MprA is activated in the presence of SDS,which represses the transcription of trcR and activates the transcription of rv1057.However,TrcR represses the transcription of rv1057 in the absence of SDS.

Comparison of the effects of quadruple and triple chemotherapy in the treatment of Helicobacter pylori posi-tive peptic ulcer / 中国基层医药

Objective To compare the curative effect of quadruple therapy and triple therapy for Helicobact-er pylori positive peptic ulcer.Methods 62 patients with Helicobacter pylori positive peptic ulcer were randomly devided into observation group(32 cases)and control group(30 cases).Patients in the control group were treated with triple therapy (lansoprazole,amoxicillin,clarithromycin),while the observation group was given quadruple therapy (lansoprazole,amoxicillin,clarithromycin,colloidal bismmth pectin).The clinical efficacy,ulcer healing rate,H.pylori eradication rate and adverse reaction rate of the two groups were observed and compared.Results The clinical effect of the observation group was better than the control group(remission rate 96.88% vs.83.33%),the difference was significant (χ2 =21.44,P 0.05).The incidence of adverse reactions between the two groups had no statistically significant difference (P >0.05).Conclusion Quadruple therapy in the treatment of H.pylori positive peptic ulcer has good curative effect,did not increase the incidence of adverse reactions.It is worthy of popularization and application.

DNA methylation-mediated epigenetic silencing of miR-720 contributes to leukemogenesis in acute myeloid leukemia / 中华血液学杂志

<p><b>OBJECTIVE</b>To investigate the expression level and regulation mechanism of miR-720 as well as the association of miR-720 expression with leukemia biological characteristics.</p><p><b>METHODS</b>Expression and promoter methylation of miR-720 were determined by quantitive PCR and pyrosequencing in 38 patients with AML and 20 normal controls. Lentivirous-mediated miR-702 overexpression was constructed in AML cell line kasumi-1. The cell proliferation, apoptosis, cycle, colony formation, migration and P53-mediated apoptosis pathway were determined.</p><p><b>RESULTS</b>AML patients showed significantly lower miR-720 expression compared with normal controls (0.69±0.09 vs 3.00±0.46, P<0.01); The methylation level of miR-720 promoter region in AML patients were significantly higher than normal controls [(75.56±2.35)% vs (47.65±2.78)%, P<0.01]. miR-720 overexpression in kasumi-1 cells induced significantly increased cell apoptosis (P=0.017), elevated apoptosis sensitivity to etoposide (P=0.004), and reduced cell proliferation (P<0.01). miR-720 overexpression also induced reduced colony formation (P=0.005), cell cycle arrest in G(1)/G(0) phase and decreased migration ability in kasumi-1 cells. In addition, overexpression of miR-720 significantly induced increased cell apoptosis-related proteins including P53 and Bax, and activation of NF-κB signal transduction pathway. After kasumi-1 cells were treated with 1uM decitabine for 48 hours, miR-720 promoter methylation reduced significantly, and miR-720 expression significantly increased.</p><p><b>CONCLUSION</b>The expression of miR-720 in AML patients reduced significantly, and DNA methylation-mediated epigenetic silencing of miR-720 contributed to maintain the malignant characteristics of AML.</p>

Study of the relationship between chemokine and the curative effect and prognosis of multiple myeloma / 中国医师进修杂志

ct curative effect and prognosis of multiple myeloma.

Outcome of childhood acute promyelocytic leukemia treated with all-trans-retinoic acid and chemotherapy / 白血病·淋巴瘤

Objective To determine the results of treatment combining all-trans-retinoic acid(ATRA)in childhood acute promyelocytic leukemia(APL).Methods 22 children with newly diagnosed APL received induction therapy with ATRA followed by 3 courses of consolidation chemotherapy:daunorubicin,idarubicin,homoharringtonine or aclacinomycin plus cytosine arabinoside.A maintenance therapy was then administered with ATRA and these reigems for 36 months.Results Early deaths from diffuse intravazcular clotting and intracranial hemorrhage occurred in two patients.The other children achieved a complete remission(CR).By June 2007,the estimated disease-free survival rates at 1,3 and 5 years were 100%,93.3% and 84.7%;respectively.The side effects of ATRA were xerosis eutis and xerocheilia,headaches,nausea and vomiting,hepatic function lesion and ATRA syndrome.Conclusion Remission induction therapy with ATRA is effective and safe for newly diagnosed childhood APL.The maintenance therapy combined chemotherapy with ATRA can improve the long-term effects of APL patients.The main causes of death in APL children is diffuse intravascular clotting and intracranial hemorrhage.The side effects of ATRA can be tolerated.

Extraction of 5 Volatile Oils from Rutongxiaojie Granule and Preparation of ?-cyclodextrin Inclusion Compound / 中国药房

OBJECTIVE: To optimize the extraction condition of volatile oil from five medicinal materials in Rutongxiaojie granules and to optimize the inclusion process of the extracted volatile oil. METHODS: The extraction condition was evaluated by orthogonal test with the recovery of volatile oil as indicator; and the inclusion condition was evaluated with the comprehensive scores of recovery ratio of inclusion compound, the content of volatile oil in inclusion compound and the utilization ratio of the volatile oil as criteria. RESULTS: The optimum extraction condition was established as follows: the medicinal materials were soaked in 10 times volume of water for 1hour and distilled for 9h by steam distillation. The optimum inclusion condition was as follows: the proportion of volatile oil to ?-CD was 1∶8; the inclusion temperature was 30℃ and including time was 20min. CONCLUSION: Both the extraction condition and the inclusion condition were reasonable and feasible.