In recent years,the United States analyzing the aging of the population brought by the increase in cardiovascular diseases such as medical equipment and its impact on the U.S. market-oriented role,combined with the present condition of population and medical device market of China,the trend of aging is pointed out and that there is a great potential market of medical device for cardiovascular disease in China,but some problems still exist,such as high price,low public acceptance,etc. According to relevant policies,corresponding suggestions were proposed for domestic medical device companies to enhance their R&D capability and adaptability to the medical system reform.

Objective:To investigate the role and mechanism of interleukin (IL)-6/signal transducer and activator of transcription 3 (STAT3) signaling pathway in proliferation, invasion and apoptosis of cervical cancer cells infected by high-risk human papillomavirus (HPV).Methods:HPV-18 positive HeLa cells cultured in vitro were divided into control group (normal cultured), IL-6 group (stimulated with 50 ng/ml IL-6 for 24 h) and IL-6 + AG490 group (stimulated with 50 ng/ml IL-6 and 100 μmol/L STAT3 signaling pathway inhibitor AG490 for 24 h). Methyl thiazolyl tetrazolium (MTT) assay was used to detect the cell survival rate. The ability of cell clone formation was detected by plate clone formation assay. The cell invasion was detected by transwell chamber assay. The cell apoptosis was detected by flow cytometry. Western blot was used to detect the protein expression levels of STAT3, phosphorylation of (p)-STAT3, B-cell lymphoma-2 gene (Bcl-2), CyclinD1 and matrix metalloproteinase-9 (MMP-9). Results:Compared with those in the control group, the cell survival rate, clone formation rate, number of invasive cells and the protein expression levels of p-STAT3, Bcl-2, CyclinD1 and MMP-9 in IL-6 group were significantly higher, while the apoptosis rate was significantly lower ( P<0.05); at the same time, compared with those in IL-6 group, the cell survival rate, clone formation rate, the number of invasive cells and the protein expression levels of p-STAT3, Bcl-2, CyclinD1 and MMP-9 in IL-6 + AG490 group were significantly lower, while the apoptosis rate was significantly higher ( P<0.05). Conclusions:IL-6/STAT3 signaling pathway plays an important role in the malignant progression of high-risk HPV infected cervical cancer cells, and its mechanism may be related to the up-regulation of CyclinD1, MMP-9, Bcl-2 protein expressions.

Objective To compare the effect of transplant islets between the subcutaneous inguinal white adipose tissues and renal capsule in the treatment of type 1 diabetes mellitus in mouse models. Methods The mice with type 1 diabetes mellitus undergoing islet transplantation were divided into the white adipose group (n=10) and renal capsule group (n=10). The islets were isolated, purified and transplanted to the subcutaneous white adipose tissues of inguinal region and renal capsule. The random blood glucose level and glucose tolerance function of the recipient mice in two groups were continuously monitored after operation. Islet grafts of the surviving recipient mice were harvested at postoperative 100 d for histopathological examination. Results In the white adipose group, the blood glucose levels of 6 recipient mice were restored to normal at 1 month after transplantation, whereas the blood glucose levels of the other 4 recipient mice were high, which died before the end of monitoring. In the renal capsule group, the blood glucose levels of 10 recipient mice returned to normal within 10 d after transplantation. Islet grafts of the recipient mice in two groups could lower the blood glucose levels, whereas the islet grafts in the white adipose group required a longer time to exert the effect. The glucose tolerance function of the mice in the renal capsule group was significantly better than that of those in white adipose group (P < 0.05). Histopathological examination demonstrated that the insulin of the islet grafts was normally expressed in two groups. Conclusions The islets transplanted into the subcutaneous white adipose tissues of inguinal region can play an effective role in regulating the changes of blood glucose level. Although the blood glucose-lowering function is slightly weaker than that of the islets graft in the renal capsule, it has multiple advantages resembling the ideal islet transplantation sites, which is a promising replacement site for islet transplantation.

To establish a platform to monitor the immune rejection after abdominal aortic patch suture in a xenotransplantation model.Methods The carotid was excised from wild-type Bama pigs,cut into 2.5 cmx 1.0 cm pieces in shuttle shape and subsequently sutured to the abdominal aorta of cynomolgus monkeys.No immunosuppressive agent was administered.General conditions of the recipient monkeys were observed.The morphological changes of the graft artery were assessed by pathological examination at postoperative 1 year.Before and 7,14,28 and 49 d after surgery,the blood samples were collected from the recipient monkeys.The serum levels of IgM and IgG antibodies were quantitatively measured by the red blood cell and peripheral blood mononuclear cell (PBMC) from Bama pigs.The quantity of lymphocytes in the recipient monkeys was detected by routine blood test and flow cytometry.Results All 3 monkeys undergoing transplantation survived well.At postoperative 1 year,the lateral tissues of the vascular wall at the artery graft were seen in dark red color.Hematoxylin-eosin (HE) staining revealed a large quantity of red blood cell and platelet deposition,accompanied with lymphocyte infiltration.Using porcine red blood cell and PBMC as target cells,the serum levels of anti-pig IgM and IgG antibodies peaked at postoperative 28 d,and slightly declined at postoperative 49 d.The quantity of lymphocytes and T cell subset also peaked at postoperative 28 d and began to decrease at postoperative 49 d.Conclusions Artery patch suture is a simple and reliable xenotransplantation model.The recipients can maintain normal physiological state without the use of immunosuppressive agents.The grafts can effectively activate the immune system of the recipients,induce the production of anti-pig antibodies and provoke cellular immune rejection.Therefore,this model can be utilized to monitor the immune rejection throughout the xenotransplantation process.

Objective In this study, a strain of colistin and tigecycline-resistant bacteria isolated in 2009 was analyzed, and the structure of drug-resistant plasmid and genetic environment were discussed, so as to provide basis for the prevention and control of multidrug-resistant bacteria. Methods A strain (GZ12244) with positive mcr and tet(M) was obtained by screening colistin and tigecycline resistance genes. Vitek-2 was used for strain identification, and the drug sensitivity test was carried out by broth dilution method. The molecular typing, drug resistance genes, insertion sequences, plasmid structure and genetic background were analyzed by genome-wide sequencing and bioinformatics. Results Strain GZ12244 is Klebsiella pneumoniae, which is resistant to colistin B, tigecycline, cefuroxime and tetracycline, and carries a variety of drug-resistant related genes such as mcr-1 and tet(M), and some of the drug-resistant genes with antibiotic efflux and antibiotic target change have amino acid substitution mutations. Mcr-1 and tet(M) coexist in a plasmid, and mcr-1 flanked by two insertion sequences ISApl1. There are insertion sequences such as IS15, IS1D and ISEc63 in the upstream and downstream of tet(M) gene. Conclusion Klebsiella pneumoniae GZ12244 is a multidrug-resistant strain. The drug-resistant gene exists in plasmid, and the mobile elements in upstream and downstream may spread the drug-resistant gene.

Objective To explore the research progress, research hotspot and development trend of tigecycline resistance based on the quantitative analysis and visualization function of CiteSpace. Methods The data were collected from 4,263 Chinese and English articles on tigecycline resistance in CNKI, Wanfang, VIP and Web of Science (WOS) databases from 2012 to 2022. CiteSpace 5.8.R3 software was used to analyze the cooperative network of authors, the cooperative network of countries and institutions, the total citation times of journals, and keywords included in the literature, to reveal the hotspots and trends of tigecycline resistance research. Results The number of articles published in English literature was higher than that in Chinese literature. China had the largest number of published documents, showing a significant international academic influence in this research field. Countries all over the world were concerned about the resistance of tigecycline, but Chinese literatures focused more on the clinical infection and prevention of tigecycline resistance, while English literatures placed special emphasis on the research about the drug resistance mechanism of tigecycline. Conclusion The research direction at home and abroad is basically the same, but the research focus has gradually shifted from the clinical treatment and monitoring of tigecycline to the molecular level of drug resistance mechanism.