Expressions of CD96 and CD123 and Their Relationship with Prognosis of Patients with Myelodysplastic Syndrome / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To explore the relationship between expression of CD96 and CD123 and prognosis of patients with myelodysplastic syndrome(MDS).</p><p><b>METHODS</b>Eight-nine MDS patients(MDS group) and 20 persons without hematologic disease as controls(Control group) were enrolled. The patients were grouped by the risk. All participants received bone marrow biopsy. Mononuclear cells were extracted, CD34CD38CD123and CD34CD38CD96cells were counted by using flow cytometry. Expressions of 2 type cells in control group, MDS group and its subgroups were analyzed.</p><p><b>RESULTS</b>The proportion of CD34cells and CD34CD38cells in mononuclear cells of patients in MDS group was higher than in control group (P<0.05). The proportions of CD34CD38CD123cells and CD34CD38CD96cells in CD34CD38cells were significantly higher than that in control group(P<0.05) and the proportion increased with the risk. In the low-and middle-risk group, the rates of complete remission(CR) and partial remission(PR) of patients with CD123and CD96were higher than those in patients with CD123and CD96; in the middle-2 and high risk patients, the PR of patients with CD123was higher than that in patients with CD123(P<0.05). The CR rate of patients with CD96was higher than that of patients with CD96(P<0.05).</p><p><b>CONCLUSION</b>The differentiation of CD34cells in bone marrow of MDS patients is abnormal, and the high expression of CD123 and CD96 cells existes. These findings may partially explain the cause of hematopoietic stem cell malignant clone in MDS patients.</p>

An Early Pregnant Chinese Woman with Cerebral Venous Sinus Thrombosis Succeeding in Induction of Labor in the Second Trimester / 中国医学科学杂志(英文版)

Cerebral venous sinus thrombosis (CVST) is a rare condition in early pregnancy. A 22-year-old Chinese woman at 10 weeks of pregnancy requested induced abortion and was diagnosed as CVST for a severe headache accompanying with nausea and vomiting. The patient was treated successfully with anticoagulation, followed by amniocentesis, and finally succeeded in induction of labor safely. The diagnosis, treatment and prognosis for this rare condition are discussed in this paper.

Expression, purification and enzymatic characterization of adenylate kinase of Thermus thermophilus HB27 in Escherichia coli / 南方医科大学学报

<p><b>OBJECTIVE</b>To clone the gene encoding adenylate kinase of Thermus thermophilus HB27, an extremely thermophilic bacterium, express the protein in Escherichia coil and study the enzymatic characterization.</p><p><b>METHODS</b>The DNA fragment encoding adenylate kinase was obtained by PCR from the total DNA of Thermus thermophilus HB27 and cloned into the vector pET-28a. The recombinant plasmid was identified by PCR, restriction endonuclease digestion and sequence analysis. Enzymatic characterization of the expressed protein was carried out using spectrophotometric assays.</p><p><b>RESULTS</b>The gene coding for adenylate kinase from Thermus thermophilus HB27 was cloned and the protein was overexpressed in Escherichia coli BL21(DE3). The optimum reactive pH and temperature for the enzyme were 8.5 and 90 degrees celsius;, respectively. The Km of the recombinant adenylate kinase for ADP was 68.6 micromol/L, with an V(max)ADP of 0.294 mmol/(L.min). Under the condition of environmental temperature at 70, 80, 90, or 100 degrees celsius; for 7 h, the recombinant adenylate kinase still retained the enzymatic activity with high thermostability. AP5A, a specific adenylate kinase inhibitor, inhibited the enzymatic activity of the protein by 70% at the concentration of 2.0 mmol/L, with a Ki value of 46.39 micromol/L for ADP.</p><p><b>CONCLUSION</b>The gene coding for adenylate kinase of Thermus thermophilus HB27 has been successfully cloned and expressed in Escherichia coil, which provides the basis for potential use of the highly thermostable recombinant HB27 adenylate kinase.</p>