Data Availability StatementThe datasets used and/or analysed during the current study
June 2, 2019
Data Availability StatementThe datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. Furthermore, animal experiments have shown that infection directly induces and accelerates atherosclerotic lesion development in pigs and mice [5, 6]. In vivo studies have suggested that enters the systemic circulation through inflammation-injured epithelial structures; then, this bacterium adheres to and invades vascular endothelial cells, proliferates in host cells, promotes the release of a variety of proinflammatory cytokines and induces atherosclerosis formation [7C11]. Macrophage migration inhibitory factor (MIF) has been recognized as a key factor in the vascular processes leading to atherosclerosis [12C14]. MIF expression in endothelial cells is dysregulated in response to proatherogenic stimuli during the development of atherosclerotic lesions in human beings, rabbits, and mice [15, 16]. Latest research demonstrated that MIF improved monocyte recruitment through the procedure for atherosclerosis advancement . Among the mechanisms of the effect may be the MIF-mediated up-regulation of adhesion molecule manifestation in vascular endothelial cells, which in turn causes the monocytes moving in blood flow to decelerate quickly, roll for the vessel wall structure, aggregate also to the vessel wall structure  adhere. Studies show that improved intercellular adhesion molecule ??1 (ICAM-1) expression is among the molecular mechanisms from the pathological adjustments through the early stage of atherosclerosis. By mediating leukocyte adhesion, ICAM-1 improved plaque instability and accelerated plaque thrombosis and rupture, leading to cardiovascular disease (CVD) events . Our previous studies have found that infection increases ICAM-1 expression in endothelial cells and monocyte-endothelial cell adhesion . These Camptothecin distributor findings suggested that induces the Camptothecin distributor inflammatory process of atherosclerosis. However, the exact role that plays in the development of atherosclerosis is still unclear. We hypothesized that infection promotes the formation of atherosclerosis through MIF. In the present study, we examined the MIF production induced by ATCC 33277 in endothelial cells. We also investigated the impact of MIF on the adhesive properties of endothelial cells pretreated with the antagonist ISO-1 or human recombinant MIF (rMIF) plus ISO-1. Our novel findings have identified a more detailed pathological role of in atherosclerosis. Methods Bacterial strains and culture methods The strain ATCC 33277 was anaerobically (80% N2, 10% O2, 10% H2) cultured in brain heart infusion broth that contained defibrinated sheeps blood (5%), hemin (0.5%) and vitamin K (0.1%) at 37?C. Bacterial cells were cultured overnight until the optical density reached 1.0 at 600?nm; then, the cells were resuspended in Dulbeccos modified Eagle medium (DMEM, Gibco BRL, Carlsbad, CA, USA) at a final concentration of 1 1??1012 cells/L. Cell lines The human umbilical vein endothelial cell line EA.hy926 and the THP-1 monocyte model (a monocytic leukaemia cell line) were purchased from Keygen Biotech company (Nanjing, China). EA.hy926 cells were cultured in DMEM containing 15% fetal bovine serum, and the THP-1 cells were cultured in DMEM containing 10% fetal bovine serum at 37?C in 5% CO2. EA.hy926 cells (105 cells mL??1) were seeded in the tissue plate wells and were cultured until a confluent monolayer formed for subsequent study. Cell viability, which was ?90% for all the infection assays, was determined by trypan blue exclusion assay. THP-1 cells were labeled with the fluorescent dye calcein AM (0.1?mg/mL; BioVision, CA, USA) for 30?min before being co-cultured with EA.hy926 cells. Enzyme linked immunosorbent assay (ELISA) Bacterial suspensions were added to the EA.hy926 cells at a multiplicity of infection (MOI) of 100 for 4, 10 or 24?h, while (ATCC 33277 at an MOI of 100 for 24?h. The whole cell protein of EA.hy926 cells was extracted, and Western blotting was performed. The EA.hy926 cells were lysed, and the protein concentration was determined by a BCA assay. Equal amounts of whole cell lysate were separated with 8% SDS-polyacrylamide gel electrophoresis and were transferred to a nitrocellulose filter membrane. After blocking, the protein was blotted with rabbit monoclonal anti-ICAM-1 antibody (1:500; Wanlei, Shenyang, China) and goat anti-rabbit Dylight 800-conjugated fluorescent antibody (1:1000; Abbkine Inc., Redlands, CA, USA). Western blot analysis was performed with Odyssey CLX (LI-COR, Lincoln, NE, USA). Quantitative real-time polymerase chain reaction (qRT-PCR) EA.hy926 cells were treated as mentioned above (in Western blot analysis). Then, the total RNA of EA.hy926 cells was extracted using TRIzol reagent (Invitrogen, Carlsbad, CA, USA). To remove the genomic DNA, total RNA was treated with DNase I for 2?min at 42?C following the manufacturers protocol. The RNA integrity was checked via electrophoresis on 1.0% agarose gels. The RNA purity was identified by the 260/280?nm optical density proportion, and RNA examples Camptothecin distributor with an 260/280?nm optical density proportion higher than LT-alpha antibody 1.9 were selected for later analysis..