کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2589965 1131719 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Paraquat induces epigenetic changes by promoting histone acetylation in cell culture models of dopaminergic degeneration
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست بهداشت، سم شناسی و جهش زایی
پیش نمایش صفحه اول مقاله
Paraquat induces epigenetic changes by promoting histone acetylation in cell culture models of dopaminergic degeneration
چکیده انگلیسی

Environmental neurotoxic exposure to agrochemicals has been implicated in the etiopathogenesis of Parkinson's disease (PD). The widely used herbicide paraquat is among the few environmental chemicals potentially linked with PD. Since epigenetic changes are beginning to emerge as key mechanisms in neurodegenerative diseases, herein we examined the effects of paraquat on histone acetylation, a major epigenetic change in chromatin that can regulate gene expression, chromatin remodeling, cell survival and cell death. Exposure of N27 dopaminergic cells to paraquat induced histone H3 acetylation in a time-dependent manner. However, paraquat did not alter acetylation of another core histone H4. Paraquat-induced histone acetylation was associated with decreased total histone deacetylase (HDAC) activity and HDAC4 and 7 protein expression levels. To determine if histone acetylation plays a role in paraquat-induced apoptosis, the novel HAT inhibitor anacardic acid was used. Anacardic acid treatment significantly attenuated paraquat-induced caspase-3 enzyme activity, suppressed proteolytic activation and kinase activity of protein kinase C delta (PKCδ) and also blocked paraquat-induced cytotoxicity. Together, these results demonstrate that the neurotoxic agent paraquat induced acetylation of core histones in cell culture models of PD and that the inhibition of HAT activity by anacardic acid protects against apoptotic cell death, indicating that histone acetylation may represent key epigenetic changes in dopaminergic neuronal cells during neurotoxic insults.


► Paraquat exposure induces acetylation of histone in cell culture models of Parkinson's disease.
► Paraquat exposure reduces HDAC activity and HDAC4 and 7 protein expression.
► Paraquat-induced acetylation plays a role in apoptotic cell death of dopaminergic cells.
► Histone acetylation may represent a key epigenetic change in environmentally liked PD.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: NeuroToxicology - Volume 32, Issue 5, October 2011, Pages 586–595
نویسندگان
, , , , ,