Epidemiological and genetic characteristics of sapovirus clusters in Changzhou schools from 2019 to 2022 / 中国学校卫生

Objective@#To analyze the epidemiological characteristics and genetic characteristics of sapovirus (SaV) in a cluster of schools in Changzhou, so as to provide a reference for the treatment of clustered vomiting and diarrhea events in schools.@*Methods@#The epidemiological data and laboratory test data of sapovirus clusters in Changzhou from 2019 to 2022 were collected and analyzed. Partial VP1 genes of SaV positive samples were amplified and sequenced for phylogenetic analysis.@*Results@#A total of 8 cases of clusters of SaV epidemics were reported in Changzhou City from 2019 to 2022, with 118 reported cases. The total attack rate was 1.47%, and the median of the attack number was 15. There were 6 outbreaks in kindergartens and 2 outbreaks in primary schools, which were reported in the epidemic period from September to December. The main clinical manifestations were vomiting (113 cases, 95.76 %), abdominal pain (39 cases, 33.05%), and diarrhea (16 cases, 13.56%). Among the 8 outbreaks, 17 sample strains were successfully sequenced. 5 outbreaks were GII.3 , and the other 3 outbreaks were GI.1, GI .3 and GII.2. GI and GII were the main genotypes in this area, and GII .3 was the predominant strain.@*Conclusion@#SaV is an important pathogen in the clusters of vomiting and diarrhea in schools after the transmission of norovirus. Continuous surveillance of SaV should be carried out to further understand its epidemiological characteristics and genotype distribution, so as to provide scientific basis for the prevention and control of the epidemic in schools.

Mechanism of Cyclophilin A in tumor / 国际肿瘤学杂志

Cyclophilin A (CypA) is found to be highly expressed in different kinds of tumor cells,which could regulate the occurrence and development of many kinds of tumor through multiple signal transduction pathways such as inducing the formation of inflammatory carcinoma,accelerating the transcription cycle of tumor cells,promoting the invasion and metastasis of tumor cells,inhibiting the apoptosis of tumor cells and reducing the sensitivity of tumor cells to chemotherapy drugs.It suggests that CypA might be considered as a kind of oncogene,which is expected to be a novel target for tumor treatment.

Diallyl disulfide inhibits invasion and metastasis of MCF-7 breast cancer cells in vitro by down-regulating p38 activity / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the effect of diallyl disulfide (DADS) on invasion and metastasis of human breast cancer MCF-7 cells and explore the possible mechanism.</p><p><b>METHODS</b>MCF-7 cells treated with 100, 200, and 400 µmol/L of DADS for 24 h were examined for cell invasion and migration capacities using Transwell assay and wound healing assay, respectively. The protein expression of E-cadherin, vimentin, MMP-9 and p-p38 in the cells were detected with Western blotting. The effect of transforming growth factor-β1 (TGF-β1) as the agonist of p38 activity was tested in antagonizing the effects of DADS.</p><p><b>RESULTS</b>DADS inhibited the invasion and migration of MCF-7 cells in a dose-dependent manner, down-regulated the protein expression of Vimentin and MMP-9 and up-regulated E-cadherin expression in the cells. Treatment with TGF-β1 to up-regulate p38 activity obviously antagonized the inhibitory effect of DADS on the invasion and metastasis of MCF-7 cells.</p><p><b>CONCLUSION</b>DADS can inhibit the invasion and metastasis of MCF-7 cells in vitro by down-regulating p38 activity.</p>

Expression of MCT4 and its clinicopathologic significance in cervical squamous cell carcino-ma / 临床与实验病理学杂志

Purpose To explore the expression of monocarboxylate transporters 4 (MCT4) and its clinicopathologic significance in cer-vical squamous cell carcinoma. Methods The expression level of MCT4 in 72 cervical squamous cell carcinoma tissues and 48 cervi-cal normal tissues were detected by immunohistochemistry assay, and its relationship with clinical pathological features was analyzed. Results The positive rate of MCT4 was 81. 9% (59/72) in cervical squamous cell carcinoma tissues and 35. 4% (17/48) in normal cervical tissues. The positive rate of MCT4 in cervical squamous cell carcinoma was significantly higher than that in cervical normal tis-sues (χ2 =26. 848, P<0. 001). In addition, the expression of MCT4 protein was correlated with clinical stage (χ2 =5. 389, P=0. 020) and lymph node metastasis (χ2 =4. 706, P=0. 030). However, it did not correlated with age (χ2 =1. 238, P=0. 266), tumor differentiation (χ2 =0. 530, P=0. 467) or infiltration degree (χ2 =1. 300, P=0. 254) in patients with cervical squamous cell carcinoma. Conclusion The expression of MCT4 is up-regulated in cervical squamous cell carcinoma and correlate with clinical stage and lymph node metastasis of cervical squamous cell carcinoma. MCT4 may be a biomarker for evaluating the biological behavior of cer-vical squamous cell carcinoma.

Coronavirus membrane-associated papain-like proteases induce autophagy through interacting with Beclin1 to negatively regulate antiviral innate immunity

Autophagy plays important roles in modulating viral replication and antiviral immune response. Coronavirus infection is associated with the autophagic process, however, little is known about the mechanisms of autophagy induction and its contribution to coronavirus regulation of host innate responses. Here, we show that the membrane-associated papain-like protease PLP2 (PLP2-TM) of coronaviruses acts as a novel autophagy-inducing protein. Intriguingly, PLP2-TM induces incomplete autophagy process by increasing the accumulation of autophagosomes but blocking the fusion of autophagosomes with lysosomes. Furthermore, PLP2-TM interacts with the key autophagy regulators, LC3 and Beclin1, and promotes Beclin1 interaction with STING, the key regulator for antiviral IFN signaling. Finally, knockdown of Beclin1 partially reverses PLP2-TM's inhibitory effect on innate immunity which resulting in decreased coronavirus replication. These results suggested that coronavirus papain-like protease induces incomplete autophagy by interacting with Beclin1, which in turn modulates coronavirus replication and antiviral innate immunity.

Using the theory of coevolution to predict protein-protein interactions in non-small cell lung cancer / 癌症

Systems biology has become an effective approach for understanding the molecular mechanisms underlying the development of lung cancer. In this study, sequences of 100 non-small cell lung cancer (NSCLC)-related proteins were downloaded from the National Center for Biotechnology Information (NCBI) databases. The Theory of Coevolution was then used to build a protein-protein interaction (PPI) network of NSCLC. Adopting the reverse thinking approach, we analyzed the NSCLC proteins one at a time. Fifteen key proteins were identified and categorized into a special protein family F(K), which included Cyclin D1 (CCND1), E-cadherin (CDH1), Cyclin-dependent kinase inhibitor 2A (CDKN2A), chemokine (C-X-C motif) ligand 12 (CXCL12), epidermal growth factor (EGF), epidermal growth factor receptor (EGFR), TNF receptor superfamily, member 6(FAS), FK506 binding protein 12-rapamycin associated protein 1 (FRAP1), O-6-methylguanine-DNA methyltransferase (MGMT), parkinson protein 2, E3 ubiquitin protein ligase (PARK2), phosphatase and tensin homolog (PTEN), calcium channel voltage-dependent alpha 2/delta subunit 2 (CACNA2D2), tubulin beta class I (TUBB), SWI/SNF-related, matrix-associated, actin-dependent regulator of chromatin, subfamily a, member 2 (SMARCA2), and wingless-type MMTV integration site family, member 7A (WNT7A). Seven key nodes of the sub-network were identified, which included PARK2, WNT7A, SMARCA2, FRAP1, CDKN2A, CCND1, and EGFR. The PPI predictions of EGFR-EGF, PARK2-FAS, PTEN-FAS, and CACNA2D2-CDH1 were confirmed experimentally by retrieving the Biological General Repository for Interaction Datasets (BioGRID) and PubMed databases. We proposed that the 7 proteins could serve as potential diagnostic molecular markers for NSCLC. In accordance with the developmental mode of lung cancer established by Sekine et al., we assumed that the occurrence and development of lung cancer were linked not only to gene loss in the 3p region (WNT7A, 3p25) and genetic mutations in the 9p region but also to similar events in the regions of 1p36.2 (FRAP1), 6q25.2-q27 (PARK2), and 11q13 (CCND1). Lastly, the invasion or metastasis of lung cancer happened.

Isolation, identification and analysis of the expression profile of miRNAs in Aedes albopictus / 南方医科大学学报

<p><b>OBJECTIVE</b>To verify the miRNA in Aedes albopictus and characterize the expression profile of several miRNAs across all the life stages of Aedes albopictus.</p><p><b>METHODS</b>Based on the published miRNA sequences of Anopheles gambiae and Aedes aegypti, 6 DIG-labeled antisense probes were synthesized. The total RNAs from Aedes albopictus in 6 developmental stages (embryo, early larvae, late larvae, pupa, male and female adults) were extracted with a mirVana miRNA isolation kit, loaded onto 15% denaturing polyacrylamide gel and hybridized with the appropriate DIG-labeled probes.</p><p><b>RESULTS</b>Northern blotting detected 5 miRNAs in Aedes albopictus, of which mir-9a was mainly expressed in embryo and larva stages, let-7 in pupa and adult stages, miR-184 in all life stages, mir-M1 only in the embryos and miR-1175 in all the life stages except for embryos. The expression profiles of these miRNAs in Aedes albopictus were similar to those in D. melanogaster and An.stepheni. miR-1174 was not detected in any of the developmental stages of Aedes albopictus.</p><p><b>CONCLUSION</b>These results present the first direct experimental evidence of miRNA in Aedes albopictus. The expression profiles of the analyzed miRNAs in Aedes albopictus showed stage specificity and conservation with other mosquitoes. Further studies on the functions of these miRNAs may offer new insights in mosquito biology and may lead to novel approaches to the development of insecticides.</p>

A reverse transcriptase-polymerase chain reaction method improving the specific amplification of caveolin-1 gene sequences / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To construct a reverse transcriptase-polymerase chain reaction (RT-PCR)approach that can improve the specificity of primers while dropping down the nonspecific amplification.</p><p><b>METHODS</b>In the recent study we reported a new RT-PCR assay which improved markedly the specificity. However its efficiency of regressing nonspecific amplification remains to be accurately checked and further documented. In primer design, we looked over again some sequences that showed differences at 5' or 3' ends between human CAV1 and mouse Cav1 genes. cDNAs and the diluted plasmids which harbored the sequence of human CAV1 or mouse Cav1 gene were chosen as the templates. The ordinary PCR compared with one, of which primers modified by phosphorothioate and combined with proofreading polymerase, for their efficiencies of nonspecific amplification inhibited.</p><p><b>RESULTS</b>Taq DNA polymerase without proofreading activity could efficiently catalyze the extension of primers with a single or multiple mismatched base pairs at the 3' terminus, but the kind of primer extension can be effectively blocked by phosphorothioate modified primers combined with proofreading polymerase. Compared with ordinary PCR reaction, this new PCR method can effectively regress the primer mismatched amplification of 50 ng DNA almost equaling to 2 x 10(4) unmatched template copies in a final volume of 50 microL.</p><p><b>CONCLUSION</b>Compared with the first generation of polymerases with or without proofreading activities mediating RT-PCR reaction, the introduction of nuclease-resistant 3' modified primers (3' phosphorothioate primer extension) can offer more simplicity, accuracy, and also decrease cost.</p>

Production and cytotoxicity of the reactive oxygen species induced by diallyl trisulfide in human myeloid leukemia HL-60 cells / 中国病理生理杂志

AIM:To explore the production and cytotoxicity of the reactive oxygen species(ROS)induced by diallyl trisulfide(DATS)in HL-60 cells.METHODS:HL-60 cells were either treated with various doses of DATS alone,or DATS combination with apocynin,a specific NADPH oxidase inhibitor,or with antioxidant N-acetyl-L-cysteine(NAC)for 0,1,3,6,12 and 24 h,respectively.The intracellular ROS level was measured by flow cytometry.The activity of NADPH oxidase was evaluated by NBT reduction experiment.The content of both malondialdehyde(MDA)and the protein carbonyl were analyzed by spectrophotometer.RESULTS:The results from flow cytometry indicated that DATS significantly increased the intracellular ROS level in HL-60 cells(P