Li M.,Institute of Cardiovascular Diseases |
Wang X.,Institute of Cardiovascular Diseases |
Fu W.,Wuhan General Hospital of PLA |
He S.,Institute of Cardiovascular Diseases |
And 3 more authors.
Cellular Physiology and Biochemistry | Year: 2011
Objective: To investigate the regulation of CD4 +CD25 + Regulatory T cells (Tregs) on pro-inflammatory adhesion molecules, Krüppel-Like Factor-2 (KLF-2) and its downstream transcriptional targets in human umbilical vein endothelial cells (HUVECs) impaired by ox-LDL and the mechanisms of it. Methods and results: HUVECs were cultured in the continuous presence of ox-LDL(0 mg/L,25 mg/L,50 mg/L,100 mg/L) for 4, 6, 12 and 24 hours to allow identification of early-and late-induced genes, respectively, whereas non-stimulated controls were taken at 0 hours. The expression of pro-inflammatory adhesion molecules such as vascular cell adhesion molecule-1 (VCAM-1), intracellular adhesion molecule-1 (ICAM-1), E-selectin, KLF-2 and its target genes eNOS, PAI-1 were determined by real time RT-PCR and/or western-blot analysis. Expression of pro-inflammatory adhesion molecules, KLF-2, eNOS and PAI-1 in HUVEC cultured alone or with anti-CD3 mAbs activated Tregs, followed by addition of ox-LDL (50 mg/L) for 6 hours, are compared to expression levels in control cultures. Ox-LDL treated HUVECs increased pro-inflammatory adhesion molecules expression, as well as increased PAI-1 but decreased eNOS expression accompanied with significant downregulating of KLF-2 at a dose and time dependent manner. Furthermore, ox-LDL increased pro-inflammatory adhesion molecules but inhibited KLF2 expression was reversed by addition of Tregs. Small interfering RNA reduced endogenous KLF-2 expression and partly reversed the suppressive effect of Tregs on HUVECs activation, which strongly implicate KLF-2 as a transcriptional regulator of the Tregs-mediated effects in endothelial cells. Mechanism studies reveal that Treg-mediated KLF2 expression in HUVECs impaired by ox-LDL requires cell contact as well as soluble factors. Conclusions: Tregs could protect endothelial function that is largely dependent on KLF2 and its downstream transcriptional targets regulation involving cell-to-cell contact and soluble factors. Copyright © 2011 S. Karger AG, Basel.
Zhang Z.-Y.,Huazhong University of Science and Technology |
Chen X.-P.,Huazhong University of Science and Technology |
Lu Q.-P.,Wuhan General Hospital of PLA
Frontiers of Medicine in China | Year: 2010
The inhibitory effect of different reperfusion periods 45 min following hepatic ischemia on the expression of cholecystokinin (CCK) and vasoactive intestinal peptide (VIP) in the jejunum and the effect of salvia miltiorrhiza pretreatment were investigated, and the possible mechanism and implications were explored. Eighty rats were randomly divided into four groups: normal control group (CO group), sham-operated group (SO group), ischemia/reperfusion (I/R) injury group (IR group) and salvia miltiorrhiza pretreatment group (SM group). The rat model of I/R was established by using a non-invasive artery clamp to clip (45 min) or relax the hepatic pedicle. In the SM group, saline (40 mL/kg) and salvia miltiorrhiza injection (6 g/kg) were injected via the tail vein 30 min before clipping the hepatic pedicle. In the SO group only the porta hepatis was dissected after laparotomy without clamping the hepatic pedicle. At 0, 3, 12, 24 and 72 h post-reperfusion, respectively, upper jejunum samples were taken for immunohistochemistry of CCK and VIP. It was found that 0 h after I/R, the expression of CCK and VIP in the upper jejunum was upregulated. With prolongation of the reperfusion period, the expression of CCK and VIP was also increased, reached the peak at the 24th h, and gradually returned to the normal level at the 72nd h after reperfusion. The levels of both CCK and VIP in the SM group were lower than those in the IR group. It is suggested that the digestive tract congestion injury caused by liver ischemia can upregulate the expression of CCK and VIP in the jejunum following reperfusion. Salviae pretreatment can partly reduce the increased expression of CCK and VIP in the jejunum in the same period, which might contribute to the early recovery of gastrointestinal motility. © 2010 Higher Education Press and Springer-Verlag Berlin Heidelberg.
Yin Z.-G.,Chongqing Medical University |
Li L.,Chongqing Medical University |
Cui M.,Wuhan General Hospital of PLA |
Zhou S.-M.,Chongqing Medical University |
And 2 more authors.
PLoS ONE | Year: 2014
Background: Apolipoprotein A-I (apoA-I), the major protein for high density lipoprotein, is essential for reverse cholesterol transport. Decreased serum levels of apoA-I have been reported to correlate with subcortical infarction and dementia, both of which are highly related to white matter lesions (WMLs). However, the association between apoA-I and WMLs has never been investigated. In this study, we sought to investigate the association between apoA-I and the presence of WMLs in middle-aged and elderly subjects. Methods: Consecutive patients aged 50 years and older of our department were prospectively enrolled in this study (n = 1282, 606 men and 676 women, 65.9±9.4 years). All participants underwent MRI scans to assess the presence and severity of WMLs. Multivariate logistic regression analyses were performed to examine the association of apoA-I with WMLs. Results: Patients with WMLs were older and showed significantly higher proportion of male sex, hypertension, diabetes mellitus, previous stroke, and coronary heart disease whereas levels of total cholesterol, high density lipoprotein cholesterol, and apoA-I were lower. After adjustment for potential confounders, the lowest apoA-I quartile was independently associated with an increased risk of WMLs (odds ratio: 1.87, 95% confidence interval: 1.29-2.72). In sex-specific analyses, this relationship was observed only in women. Conclusions: Our findings demonstrated that apoA-I was inversely associated with the presence of WMLs in middle-aged and elderly subjects. This results suggest that therapies which increase apoA-I concentration may be beneficial to reduce the risk of WMLs, dementia and stroke. © 2014 Yin et al.
Wei S.-J.,Wuhan General Hospital of PLA |
Cai X.-H.,Wuhan General Hospital of PLA |
Chen X.,Shanghai Institute of Technology |
Chen D.,Shanghai Institute of Technology |
Chen J.-D.,Shanghai Institute of Technology
Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices | Year: 2012
Magnetic based capture of CTCs in microchip provides specific selection and high recovery rates with high purity. However, conventional perpendicular capture mode, which applies the magnetic field perpendicular to the flow field, shows lower capture rate under high flow field. In this paper, we suggest that the cell be captured in magnetic microchip may experience two stages which are lateral displacement stage and immobilization stage. Simulation by COMSOL and experiments were used to investigate the hydrodynamic force and magnetic force during these two stages. The data showed that the cell capture is greatly influenced by hydrodynamic force under the perpendicular capture mode. We also proposed a novel parallel capture mode design for CTC microfluidic chip. Experiment showed that this new type of chip can operated at a flow rate up to 6ml/h.