کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2895107 1172450 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chylomicron remnants upregulate CD40 expression via the ERK pathway and a redox-sensitive mechanism in THP-1 cells
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی کاردیولوژی و پزشکی قلب و عروق
پیش نمایش صفحه اول مقاله
Chylomicron remnants upregulate CD40 expression via the ERK pathway and a redox-sensitive mechanism in THP-1 cells
چکیده انگلیسی

CD40 is a 48 kDa phosphorylated transmembrane glycoprotein that belongs to the tumor necrosis factor receptor superfamily and may play a role in formation of atherosclerotic plaques. Here, we investigated the effect of chylomicron remnants on CD40 expression in the human premonocytic cell line, THP-1 cells. Chylomicron remnants upregulated the expression of CD40 protein and mRNA in a dose- and time-dependent manner. Further, chylomicron remnants increased the generation of reactive oxygen species as determined by an increasing level of 2′,7′-dichlorofluorescein. Pretreatment with the antioxidant, N-acetylcysteine, inhibited chylomicron remnant-induced CD40 protein expression by 60%. On the other hand, chylomicron remnants transiently increased the phosphorylation of extracellular signal-regulated kinase (ERK 1/2) and p38 mitogen-activated protein kinase (MAPK). Pretreatment with the MAPK kinase inhibitor, U0126, completely inhibited chylomicron remnants-induced CD40 protein expression, whereas the p38 MAPK inhibitor, SB203580, had no effect. Pretreatment with N-acetylcysteine had no effect on chylomicron remnant-induced ERK 1/2 phosphorylation. These data suggest that CD40 expression stimulated by chylomicron remnants in THP-1 cells is dependent on ERK 1/2-mediated pathway, which is followed by redox-sensitive mechanism-dependent and independent pathway. Thus, chylomicron remnants may contribute to the formation of atherosclerotic plaques via their immunological and proinflammatory effects.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atherosclerosis - Volume 187, Issue 2, August 2006, Pages 257–264
نویسندگان
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