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. 2015 Apr:73:223-32.
doi: 10.1016/j.bone.2014.12.063. Epub 2015 Jan 5.

Wnt inhibitory factor 1 (WIF1) is a marker of osteoblastic differentiation stage and is not silenced by DNA methylation in osteosarcoma (VSports注册入口)

Emma K Baker  1 , Scott Taylor  2 , Ankita Gupte  2 , Alistair M Chalk  3 , Shreya Bhattacharya  3 , Alanna C Green  3 , T John Martin  4 , Dario Strbenac  5 , Mark D Robinson  6 , Louise E Purton  3 , Carl R Walkley  7
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Wnt inhibitory factor 1 (WIF1) is a marker of osteoblastic differentiation stage and is not silenced by DNA methylation in osteosarcoma

Emma K Baker et al. Bone. 2015 Apr.
Free article

Abstract

Wnt pathway targeting is of high clinical interest for treating bone loss disorders such as osteoporosis. These therapies inhibit the action of negative regulators of osteoblastic Wnt signaling VSports手机版. The report that Wnt inhibitory factor 1 (WIF1) was epigenetically silenced via promoter DNA methylation in osteosarcoma (OS) raised potential concerns for such treatment approaches. Here we confirm that Wif1 expression is frequently reduced in OS. However, we demonstrate that silencing is not driven by DNA methylation. Treatment of mouse and human OS cells showed that Wif1 expression was robustly induced by HDAC inhibition but not by methylation inhibition. Consistent with HDAC dependent silencing, the Wif1 locus in OS was characterized by low acetylation levels and a bivalent H3K4/H3K27-trimethylation state. Wif1 expression marked late stages of normal osteoblast maturation and stratified OS tumors based on differentiation stage across species. Culture of OS cells under differentiation inductive conditions increased expression of Wif1. Together these results demonstrate that Wif1 is not targeted for silencing by DNA methylation in OS. Instead, the reduced expression of Wif1 in OS cells is in context with their stage in differentiation. .

Keywords: HDAC; Methylation; Osteoblast; Osteoporosis; Osteosarcoma; WIF1 V体育安卓版. .

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