Platelet-activating factor receptor mediates oxidized low density lipoprotein-induced migration of bone marrow-derived mesenchymal stem cells.

Background: Oxidized low density lipoprotein (oxLDL) is involved in the development of vascular diseases. Platelet-activating factor (PAF; 1-O-alkyl-2-acetyl-sn-glyero-3-phosphorylcholine) is a key component of oxLDL.

Methods: In the present study, we evaluate whether oxLDL can regulate migration of human bone-marrow derived stem cells (hBMSCs) and characterize the role of PAF in the oxLDL-induced migration.

Molecular mechanism of diallyl disulfide in cell cycle arrest and apoptosis in HCT-116 colon cancer cells.

Diallyl disulfide (DADS) is the most prevalent oil-soluble sulfur compound in garlic and inhibits cell proliferation in many cancer cell lines. Here we examined DADS cytotoxicity in a redox-mediated process, involving reactive oxygen species (ROS) production. In the present study, p53-independent cell cycle arrest at G2/M phase was observed with DADS treatment, along with time-dependent increase of cyclin B1.

Differential role of diphenyleneiodonium, a flavoenzyme inhibitor, on p53-dependent and -independent cell cycle progression.

We investigated the differential role of diphenyleneiodonium (DPI), which is widely used as an inhibitor of NADPH oxidase, on the activation of cell cycle regulators in the cell cycle progression. DPI efficiently blocked the transition from G0/G1 to S phase by serum stimulation in quiescent HCT-116 (wild-type p53) and HL-60 (null p53) cells. Concomitant with G0/G1 arrest, HCT-116 cells treated with DPI resulted in strong and sustained upregulation of p53 and p21.

High glucose enhances MMP-2 production in adventitial fibroblasts via Akt1-dependent NF-kappaB pathway.

To understand the role of adventitial fibroblasts (AF) in diabetic vascular diseases, the importance of high glucose (HG, 25mM) on matrix metalloproteinase-2 (MMP-2) production in AF was determined. HG enhanced mRNA, protein and gelatinolytic activity of MMP-2. The enhanced MMP-2 activity was significantly attenuated not only by a PI3K inhibitor but also by an Akt inhibitor.