کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1945285 | 1053259 | 2008 | 10 صفحه PDF | دانلود رایگان |

To investigate the effect of apolipoprotein B (apoB) on cell viability, we used lipid-free apoB as a model for denatured apoB. Lipid-free apoB had cytotoxicity to J774 macrophages, CHO cells and HepG2 cells, whereas apoB bound to low density lipoprotein (LDL) and lipid-free apolipoprotein A-I had no effect on cell viability. Lipid-free apoB induced apoptosis in J774 macrophages assessed by caspase-3 activation and annexin V binding. LDL receptor, heparan sulfate proteoglycans, and class A scavenger receptor were involved in the binding/uptake of lipid-free apoB, but lipid-free apoB binding/uptake by the cells did not correlate with cytotoxicity. Lipid-free apoB disrupted the lipid bilayer of large unilamellar vesicles containing calcein. We evaluated the interaction between apoB and cellular membrane by monitoring the change in intracellular Ca2+ concentration using Fura-2, and found that lipid-free apoB rapidly disrupted the cellular membrane in the absence or presence of the inhibitors for cellular binding/uptake mediated by the receptors. Therefore, it is suggested that lipid-free apoB induces cell death by disturbance of the plasma membrane. In addition to other lipid component in modified LDL, apoB itself has an ability to induce apoptosis and plays a crucial role in the development of atherosclerotic lesions.
Journal: Biochimica et Biophysica Acta (BBA) - Biomembranes - Volume 1778, Issue 11, November 2008, Pages 2594–2603