کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2775726 1152342 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Betaine prevents Mallory-Denk body formation in drug-primed mice by epigenetic mechanisms
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی بالینی
پیش نمایش صفحه اول مقاله
Betaine prevents Mallory-Denk body formation in drug-primed mice by epigenetic mechanisms
چکیده انگلیسی

Previous studies showed that S-Adenosylmethionine (SAMe) prevented MDB formation and the hypomethylation of histones induced by DDC feeding. These results suggest that formation of MDBs is an epigenetic phenomenon. To further test this theory, drug-primed mice were fed the methyl donor, betaine, together with DDC, which was refed for 7 days. Betaine significantly reduced MDB formation, decreased the liver/body weight ratio and decreased the number of FAT10 positive liver cells when they proliferate in response to DDC refeeding. Betaine also significantly prevented the decreased expression of BHMT, AHCY, MAT1a and GNMT and the increased expression of MTHFR, caused by DDC refeeding. S-Adenosylhomocysteine (SAH) levels were reduced by DDC refeeding and this was prevented by betaine. The results support the concept that betaine donates methyl groups, increasing methionine available in the cell. SAMe metabolism was reduced by the decrease in GNMT expression, which prevented the conversion of SAMe to SAH. As a consequence, betaine prevented MDB formation and FAT10 positive cell proliferation by blocking the epigenetic memory expressed by hepatocytes. The results further support the concept that MDB formation is the result of an epigenetic phenomenon, where a change in methionine metabolism causes global gene expression changes in hepatocytes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental and Molecular Pathology - Volume 86, Issue 2, April 2009, Pages 77–86
نویسندگان
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