کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6272580 | 1614784 | 2015 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lysophosphatidylcholine increases the neurotoxicity of Alzheimer's amyloid β1-42 peptide: Role of oligomer formation
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کلمات کلیدی
PBSDMEMFBSOligomerIgGLPCSMCPVDFAβDulbecco’s modified Eagle medium - Modified Eagle اصلاح شده DulbeccoMTT - MTTROS - ROSamyloid β - آمیلوئید βNeuronal apoptosis - آپوپتوز عصبیimmunoglobulin G - ایمونوگلوبولین GAlzheimer’s disease - بیماری آلزایمرTUNEL - تونلpolyvinylidene difluoride - دی فلوئورید پلی وینیلیدینdihydroethidium - دی هیدروتیدیمfetal bovine serum - سرم جنین گاوSmooth muscle cell - سلول عضلانی صافEndothelial cell - سلول های اندوتلیالphosphatidylcholine - فسفاتیدیل کولینlactate dehydrogenase - لاکتات دهیدروژناز LDH - لاکتات دهیدروژناز به صورت مختصر شده LDH Lysophosphatidylcholine - لیزوفسفاتیدیل کولینPhosphate-buffered saline - محلول نمک فسفات با خاصیت بافریDHE - وReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Oligomer formation is considered as a critical process for the neurotoxic effects of Alzheimer's amyloid β (Aβ) peptide. Previously we have demonstrated that lysophosphatidylcholine (LPC) increases the oligomer formation of Aβ1-42, the major Aβ peptide found Alzheimer's disease (AD) lesions. In this study, we have investigated whether LPC affects the neurotoxic effects of Aβ1-42 in a neuronal cell line (A1) culture. Dimethyl thiazolyl diphenyl tetrazolium (MTT) assay revealed that up to 10 μM concentration, LPC did not affect A1 cell viability. Aβ1-42 decreased the cell viability, and such effect was dose dependently enhanced by LPC. However, neither LPC nor Aβ1-42, alone or in combination increased lactate dehydrogenase (LDH) release from A1 cells after 24-h treatment. Terminal deoxynucleotidyl transferase dUTP-biotin nick-end-labeling (TUNEL) assay showed that LPC increased Aβ1-42-induced apoptotic cell number. To determine the underlying mechanisms, the proteins implicated in apoptosis pathways including Bcl-2- and caspase-family were analyzed by Western blotting. The results demonstrated that Aβ1-42 decreased Bcl-2 in A1 cells at 24 h, whereas LPC had no effect at any time point. Both LPC and Aβ1-42 increased Bax level at 24 h, and their combined stimulation showed a synergistic effect. Similar synergistic effect of LPC and Aβ1-42 on caspase9 activation was observed. Dot blot immunoassay and Western blotting showed that LPC augmented Aβ1-42 oligomer formation in cell culture medium. Removing LPC-induced early-formed Aβ1-42 oligomer from the culture medium by immunoprecipitation decreased active caspase9 level and neurotoxicity, as revealed by Western blotting and MTT assay. Furthermore, dihydroethidium (DHE) assay showed that Aβ1-42 increased reactive oxygen species level in A1 cells, such effect was further enhanced by LPC. Thus, our results demonstrated that LPC increased the oligomer formation process of Aβ1-42 peptide in culture condition, and consequently increased apoptotic neuronal death. Such process might be important for the pathogenesis of AD, and inhibition of LPC generation could be a therapeutic target for the disease.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 292, 30 April 2015, Pages 159-169
Journal: Neuroscience - Volume 292, 30 April 2015, Pages 159-169
نویسندگان
A. Md. Sheikh, M. Michikawa, S.U. Kim, A. Nagai,