Doxycycline-moxifloxacin sequential therapy for Mycoplasma genitalium urethritis/cervicitis: a clinical observation / 中华皮肤科杂志

Objective:To investigate outcomes and safety of doxycycline-moxifloxacin sequential regimen in the treatment of Mycoplasma genitalium urethritis/cervicitis. Methods:From June 2019 to December 2020, patients with Mycoplasma genitalium urethritis/cervicitis confirmed by nucleic acid amplification testing were successively recruited at Department of Sexually Transmitted Diseases, Hospital of Dermatology, Chinese Academy of Medical Sciences, and received sequential therapy with oral doxycycline for 7 days followed by oral moxifloxacin for 7 days. Clinical and/or etiological assessment was conducted 2 to 3 weeks after the end of treatment. Fisher′s exact test was used to analyze factors influencing the treatment outcome. Results:Totally, 36 eligible subjects were enrolled, including 30 males and 6 females. Among them, 18 (50%) patients completed post-treatment etiological assessment, which showed that 12 achieved microbiological cure, and treatment failures occurred in 6; another 18 patients achieved clinical cure. The overall response rate to doxycycline-moxifloacin sequential therapy was 83.3% (30/36, 95% confidence interval[ CI]: 70.5%, 96.1%) . The treatment outcome showed no significant association with the patients′ age, gender, marital status, number of sexual partners in the past 1 month, history of sexually transmitted diseases, history of antibiotic use in the past 1 month, or co-infections (all P > 0.05) . Conclusion:The efficacy of doxycycline-moxifloacin sequential regimen is limited in the treatment of Mycoplasma genitalium infections in Nanjing area, and clinicians should be alerted to the possibility of treatment failure in clinical practice.

SCOAT-Net: A Novel Network for Segmenting COVID-19 Lung Opacification from CT Images

The new coronavirus disease 2019 (COVID19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide at a rapid rate. There is no clinically automated tool to quantify the infection of COVID-19 patients. Automatic segmentation of lung opacification from computed tomography (CT) images provides excellent potential, which is of great significance for judging the disease development and treatment response of the patients. However, the segmentation of lung opacification from CT slices still faces some challenges, including the complexity and variability features of the opacity regions, the small difference between the infected and healthy tissues, and the noise of CT images. Besides, due to the limited medical resources, it is impractical to obtain a large amount of data in a short time, which further hinders the training of deep learning models. To answer these challenges, we proposed a novel spatial and channel-wise coarse-to-fine attention network (SCOAT-Net) inspired by the biological vision mechanism, which is for the segmentation of COVID-19 lung opacification from CT Images. SCOAT-Net has the spatial-wise attention module and the channel-wise attention module to attract the self-attention learning of the network, which serves to extract the practical features at the pixel and channel level successfully. Experiments show that our proposed SCOAT-Net achieves better results compared to state-of-the-art image segmentation networks.

New mutation site of SEC23B gene in type Ⅱ congenital erythrocythememia anemia: one case report and literatures review / 中华血液学杂志

Objective@#To enrich the gene mutation sites and accumulate treatment experience of congenital dyserythropoietic anemia (CDA) type Ⅱ by reporting one case of CDA patient with new mutation site of SEC23B and was successfully treated by homozygous allogeneic hematopoietic stem cell transplantation (allo-HSCT) .@*Methods@#The mutation within SEC23B gene in a child case with the reduced hemoglobin for more than 3 months, and his family were analyzed in combination with literatures review.@*Results@#A 3-day 5-month female child was admitted due to "decreasing hemoglobin for more than 3 months" , blood routine test showed HGB 44 g/L, positive for acid hemolysis test (Ham test) . Bone marrow showed that the proportion of erythroid line was 69%, mainly middle and late juvenile erythrocytes, binuclear and odd nucleated erythrocytes could be observed, and nuclear fragmentation and nuclear budding could be seen occasionally in nucleated erythrocytes, transmission electron microscopy disclosed that bone marrow harbored the typical double-layer membrane structure of nuclear erythrocytes. There were two unreported new mutation sites in the SEC23B gene, including 1504 G>C/wt and c. 2254-2255 insert A/wt. The two mutations were derived from the father and mother of the child respectively. At the late stage, the child was successfully treated with allo-HSCT, the original mutation turned negative.@*Conclusion@#This study reported the mutation type of SEC23B gene insertion for the first time in China. Allo-HSCT could be utilized as a treatment for CDA.

Analysis on the laboratory examination characteristics in 22 patients with acute megakaryoblastic leukemia / 中华血液学杂志

<p><b>OBJECTIVE</b>To analyze the ultra microstructures and the expression of platelet peroxidase (PPO) of megakaryocytes from bone marrow, their clinical manifestations and laboratory characteristics in patients with acute megakaryoblastic leukemia (AMKL).</p><p><b>METHODS</b>Karyocytes from bone marrow of 22 AMKL patients were divided into two parts by lymphocyte separation liquid, one part was used to prepare the ordinary transmission electron microscope specimens to observe the morphological structures of megakaryocytes, the other was used to prepare the histochemical specimens of platelet peroxidase to analyze the positive reaction of PPO in AMKL, which were coupled with the patients' data of with bone marrow morphology, cell chemistry, and chromosome karyotype examination.</p><p><b>RESULTS</b>Megakaryocytes from 17 of 22 patients were in the first stage, less than 20 µm in diameter, the nucleis were round, the cytoplasm contained microtubules, membranous vesicles and minute dense granules, no demarcation membrane system and surface-connected canalicular system, less dense granules and α-granules; Megakaryocytes in 5 cases were mainly in the first stage, while containing second and third stage megakaryocytes; the positive rate of PPO in megakaryocytes of 22 patients was 0-80%. The primitive and naive megakaryocytes were found in bone marrow smears of 22 cases, CD41 staining of the megakaryocytes was detected in the primitive and naive megakaryocytes, and more complex chromosome karyotype anomalies were observed.</p><p><b>CONCLUSION</b>The majority of megakaryocytes in AMKL patients were the first stage ones, the rest were second and third stage ones, and the positive PPO reaction was significantly different. CD41 staining of the megakaryocytes was specific with complex chromosome karyotypeswere.</p>

Analysis of blood cell autophagy distribution in hematologic diseases by transmission electron microscope / 中华血液学杂志

<p><b>OBJECTIVE</b>To investigate the distribution characteristics of blood cells autophagy in hematologic diseases, as well as their possible pathomechanism.</p><p><b>METHODS</b>Retrospective analysis of electron microscopy specimens of 3 277 patients with hematological diseases were performed. The blood cells autophagy was observed by transmission electron microscopy, and its distribution characteristics were analyzed. The pathomechanism of blood cell autophagy was explored in combination with clinical examination and diagnosis.</p><p><b>RESULTS</b>There were 15 samples were found to have mature granulocytes or nucleated erythrocytes autophagy. Of them, 6 cases were myelodysplastic syndrome (MDS), 2 acute leukemia, 1 in each of aplastic anemia, pure red cell aplastic anemia, thalassemia, iron deficiency anemia, lymphoma, multiple myeloma and polycythemia vera. Among 15 cases, 11 cases were found to have mature granulocytes autophagy, 4 cases nucleated erythrocytes autophagy. Besides autophagy, apoptosis occurred in 9 cases, cytolysis in 6 cases, megaloblastic change in 5 cases.</p><p><b>CONCLUSION</b>Mature granulocytes or nucleated erythrocytes autophagy occurred more frequently in MDS among hematologic diseases, dyshaematopoiesis including apoptosis, cytolysis and megaloblastic change could induce autophagy function enhancement.</p>

Inhibitory effects of calmodulin antagonist EBB on cultured fibroblast / 中国药理学通报

Inhibitory effects of the O - ( 1 - ethoxvl - butyl ) berbarmine (EBB) on cultured fibroblast was studied by observating calmodulin (CaM ) content of cultured fibroblast with ELISA and DNA content at each phase of cell cycle with flow - cvtometerv. The CaM con-tent in the test group . compared to control . decreased markedly and DNA content increased significantly in the G0+Gi phase but reduced in the S phase. These results suggested that inhibitory mechanism of EBB on fibroblast proliferation may be closely related to CaM decrease in cells.