6-Thioguanine and zebularine down-regulate DNMT1 and globally demethylate canine malignant lymphoid cells

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6-Thioguanine and zebularine down-regulate DNMT1 and globally demethylate canine malignant lymphoid cells

BACKGROUND The antimetabolite 6-thioguanine (6-TG) has been used to treat both human and canine lymphoid malignancies. 6-TG has been shown to be epigenetically active as a demethylating agent in a human lymphoma cell line, causing downregulation of DNA methyltransferase 1 (DNMT1) through ubiquitin-targeted degradation. Zebularine (Zeb), a similar cytidine analog, also has demethylating activity...

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Zebularine upregulates expression of CYP genes through inhibition of DNMT1 and PKR in HepG2 cells

Drug-induced hepatotoxicity is one of the major reasons cited for drug withdrawal. Therefore, it is of extreme importance to detect human hepatotoxic candidates as early as possible during the drug development process. In this study, we aimed to enhance hepatocyte functions such as CYP gene expression in HepG2 cells, one of the most extensively used cell lines in evaluating hepatotoxicity of ch...

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6-Thioguanine reactivates epigenetically silenced genes in acute lymphoblastic leukemia cells by facilitating proteasome-mediated degradation of DNMT1.

Thiopurines including 6-thioguanine ((S)G), 6-mercaptopurine, and azathioprine are effective anticancer agents with remarkable success in clinical practice, especially in effective treatment of acute lymphoblastic leukemia (ALL). (S)G is understood to act as a DNA hypomethylating agent in ALL cells, however, the underlying mechanism leading to global cytosine demethylation remains unclear. Here...

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Proteasome-mediated Degradation of DNMT1 Acute Lymphoblastic Leukemia Cells by Facilitating 6-Thioguanine Reactivates Epigenetically Silenced Genes in

Thiopurines including 6-thioguanine (G), 6-mercaptopurine, and azathioprine are effective anticancer agents with remarkable success in clinical practice, especially in effective treatment of acute lymphoblastic leukemia (ALL). G is understood to act as a DNA hypomethylating agent in ALL cells, however, the underlying mechanism leading to global cytosine demethylation remains unclear. Here we re...

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Metabolic effects of 6-thioguanine. I. Studies on thioguanine-resistant and-sensitive Ehrlich ascites cells.

The guanine analog, 6-thioguanine (4), has been found to be a potent inhibitor of animal neoplasms (2) and human leukemia (5) when administered alone, and even more potent when used in com bination with the inhibitor of de novo purine syn thesis, azaserine (10, 12). We have developed a thioguanine-resistant subline of the Ehrlich ascites carcinoma. Using this as a tool, we have studied the meta...

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ژورنال

عنوان ژورنال: BMC Veterinary Research

سال: 2014

ISSN: 1746-6148

DOI: 10.1186/s12917-014-0290-8