Risk factors of linezolid-related thrombocytopenia in patients in the department of hepatobiliary surgery / 药学实践杂志

Objective To provide the evidence for clinical medication safety by the investigation of the risk factors of linezolid-related thrombocytopenia in cancer patients in the department of hepatobiliary surgery. Methods Patients who received linezolid for anti-infective treatment from January 2017 to December 2021 were selected. The patients were divided into thrombocytopenia group and non-thrombocytopenia group according to whether thrombocytopenia occurred or not after administration of linezolid. The general data and laboratory indicators of the two groups were compared, and the risk factors of linezolid-related thrombocytopenia were screened by multivariate logistic regression analysis. Results A total of 104 patients were included in the study, including 84 patients who underwent surgery and 20 patients who did not. The incidence of linezolid-related thrombocytopenia was 24.0%. There were significant differences in gender, age, duration of linezolid use, platelet count, white blood cell count, alanine aminotransferase(ALT), aspartate aminotransferase(AST), total bilirubin, creatinine, estimated glomerular filtration rate between the two groups (P<0.05); logistic regression analysis suggested that age ≥60 years (OR=7.093; P=0.017), duration of linezolid use ≥12 days (OR=4.399; P=0.035), baseline platelet count ≤200×109/L (OR=8.470; P=0.004), baseline AST≥50 U/L (OR=15.465; P<0.001), and baseline white blood cell count ≥11×109/L (OR=11.436; P=0.001) were the risk factors for linezolid-related thrombocytopenia in cancer patients. Conclusion During the treatment of linezolid in cancer patients, attention should be paid to the adverse reactions of thrombocytopenia in the patients, especially those with old age, long-term treatment, low baseline platelets, poor baseline liver function, and high baseline white blood cell counts.

Identification and Validation of Circulating MicroRNA Signatures for Breast Cancer Early Detection Based on Large Scale Tissue-Derived Data / 한국유방암학회지

PURPOSE: Breast cancer is the most commonly occurring cancer among women worldwide, and therefore, improved approaches for its early detection are urgently needed. As microRNAs (miRNAs) are increasingly recognized as critical regulators in tumorigenesis and possess excellent stability in plasma, this study focused on using miRNAs to develop a method for identifying noninvasive biomarkers. METHODS: To discover critical candidates, differential expression analysis was performed on tissue-originated miRNA profiles of 409 early breast cancer patients and 87 healthy controls from The Cancer Genome Atlas database. We selected candidates from the differentially expressed miRNAs and then evaluated every possible molecular signature formed by the candidates. The best signature was validated in independent serum samples from 113 early breast cancer patients and 47 healthy controls using reverse transcription quantitative real-time polymerase chain reaction. RESULTS: The miRNA candidates in our method were revealed to be associated with breast cancer according to previous studies and showed potential as useful biomarkers. When validated in independent serum samples, the area under curve of the final miRNA signature (miR-21-3p, miR-21-5p, and miR-99a-5p) was 0.895. Diagnostic sensitivity and specificity were 97.9% and 73.5%, respectively. CONCLUSION: The present study established a novel and effective method to identify biomarkers for early breast cancer. And the method, is also suitable for other cancer types. Furthermore, a combination of three miRNAs was identified as a prospective biomarker for breast cancer early detection.

Monitoring of antimicrobial resistance of Acinetobacter baumannii in the intensive care unit of a hospital from 2010 to 2013 / 中国感染控制杂志

Objective To analyze the isolation rates and antimicrobial resistance of Acinetobacter baumannii (AB) from intensive care unit (ICU)between 2010 and 2013,and provide evidence for clinical anti-infective therapy. Methods The isolation and antimicrobial resistance of AB from ICU between 2010 and 2013 were analyzed retro-spectively.Results A total of 1 413 pathogenic strains were isolated,556(39.35%)of which were AB,isolation rates in each year were 39.45%,41 .35%,29.44%,and 40.53% respectively.AB were mainly isolated from lower respiratory tract (75.72%).Antimicrobial susceptibility testing results showed that AB had low resistance rates to cefoperazone/sulbactam(5.85%)and amikacin (17.45%);detection rates of multidrug-resistant and extensively drug-resistant AB increased from 9.63% and 3.70% to 42.50% and 31 .88%,respectively (both P < 0.001 ). Conclusion AB is the common pathogen in ICU,antimicrobial resistance is serious,isolation of multidrug-resistant and extensively drug-resistant AB increased year by year;intensifying the monitoring of drug resistance is helpful for the treat-ment and prevention of AB infection.

Research on the technological process and methods of the comprehensive pharma-ceutical experiment of rutin tablets / 药学实践杂志

Objective To imitate the development process of new drugs with rutin as the model and to do multidiscipli-nary experiments of preparation and pharmacodynamics of rutin tablets .Methods Thin-layer chromatography was used to i-dentify rutin in Pagodatree flower bud .High-performance liquid chromatography was used for quantitative determination of ru-tin in Pagodatree flower bud and rutin products .The vasodilatation effect of rutin was investigated .The preparation of rutin tablets was completed .Results and Conclusion We completed the identification of Pagodatree flower bud ,extraction and puri-fication of rutin from Pagodatree flower bud ,the assay of rutin ,the pharmaco-dynamics study and the formulation of rutin tab-lets .The experiments helped the postgraduates to be familiar with the research process of new drugs and to improve their ex-perimental operation skills .

Mechanism by which interferon reduces the resistance of MGMT positive glioma stem cells to temozolomide / 中国组织工程研究

OBJECTIVE:To investigate the role of interferon to increase the sensibilization of MGMT positive glioma stem cel s to temozolomide in vitro. METHODS:Glioma cel lines, U251 and SKMG-4, were induced by suspended cloning bal formation method to harvest MGMT positive glioma stem cel s, U251G and SKMG-4G. Cel counting kit-8 assay was used to detect the kil ing effect of interferonα/βcombined with temozolomide on MGMT positive glioma stem cel s. RT-PCR and western blot assay were employed to determine the expression of MGMT and nuclear factorκB in MGMT positive glioma stem cel s. RESULTS AND CONCLUSION:Western blot results showed positive expression of MGMT in U251G and SKMG-4G cel s at protein levels. After intervention with interferonα/β, the mRNA expression of MGMT and nuclear factorκB in SKMG-4G and U251G cel s was reduced significantly, and then further decreased after temozolomide treatment. These findings indicate that interferonα/βcan remarkably strengthen the kil ing effect of temozolomide on MGMT positive glioma stem cel s.

Screening of genetic markers based on human type 2 diabetes mellitus (T2DM) susceptibility loci in a Cynomolgus T2DM model / 中国比较医学杂志

Objective Type 2 diabetes mellitus ( T2DM) as a common disease around the world becomes a great threat to the health of human beings.The cynomolgus T2DM model, which preferably simulates human T2DM onset and progress, can be beneficial to the drug development and clinical treatment.In the present study, 37 of T2DM-susceptibility SNPs and the extended genome sequences were used to obtain corresponding SNPs in the T2DM cynomolgus monkeys. Methods Firstly, DNA pool screening was conducted.Then, using polymerase chain reaction to amplify and to sequence the cynomolgus homologous sequences.Using DNAStar software to analyze the differences between bases.Finally, we used analysis of variance and F test to calculate the frequency of alleles.We also used the GLM models of SAS software to analyze the association of genotype with fasting plasma glucose and glycosylated hemoglobin.Results SNP661A,SNP661B, SNP343A, SNP343B, SNP343C, SNP565A, SNP565B and SNP565C were found to have a significant difference of allele frequencies between spontaneous cases and controls.Conclusions The findings of this study suggest that SNP661A, SNP661B, SNP343A, SNP343B and SNP343C may play an important role in the establishment of cynomolgus T2DM models.

Mutational research on the role of lysine 21 in the Pichia stipitis xylose reductase / 生物工程学报

The xylose reductase of Pichia stipitis is one of the most important enzymes. It can be used to build up recombinant Saccharomyces cerevisiae strain for utilizing xylose and producing ethanol. Intercellular redox imbalance caused by NADPH preference over NADH for Pichia stipitis xylose reductase (PsXR) has been considered to be one of the main factors for poor ethanol productivity. Some key amino acids of PsXR, which affect the activity or coenzyme preference, were investigated in our previous study. In this study, Lys21 were rational designed for site-directed mutagenesis to alter coenzyme specificity of PsXR from NADPH and NADH into single NADH. The wild gene and mutagenesis genes were ligated into pET28b, and were transferred into E.coli BL21(DE3). After induced by IPTG, the xylose reductases were purified. Purified mutants K21A (Lys21-->Ala), K21R(Lys21-->Arg) were characterized by steady-state kinetic analysis. The results showed that the coenzyme dependence of K21A was completely reversed to NADH.