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Vitamin D Switches BAF Complexes to Protect β Cells.

Cell | 2018

A primary cause of disease progression in type 2 diabetes (T2D) is β cell dysfunction due to inflammatory stress and insulin resistance. However, preventing β cell exhaustion under diabetic conditions is a major therapeutic challenge. Here, we identify the vitamin D receptor (VDR) as a key modulator of inflammation and β cell survival. Alternative recognition of an acetylated lysine in VDR by bromodomain proteins BRD7 and BRD9 directs association to PBAF and BAF chromatin remodeling complexes, respectively. Mechanistically, ligand promotes VDR association with PBAF to effect genome-wide changes in chromatin accessibility and enhancer landscape, resulting in an anti-inflammatory response. Importantly, pharmacological inhibition of BRD9 promotes PBAF-VDR association to restore β cell function and ameliorate hyperglycemia in murine T2D models. These studies reveal an unrecognized VDR-dependent transcriptional program underpinning β cell survival and identifies the VDR:PBAF/BAF association as a potential therapeutic target for T2D.

Pubmed ID: 29754817 RIS Download

Associated grants

  • Agency: NHLBI NIH HHS, United States
    Id: P01 HL088093
  • Agency: NIH HHS, United States
    Id: S10 OD021815
  • Agency: NHLBI NIH HHS, United States
    Id: R01 HL105278
  • Agency: NIEHS NIH HHS, United States
    Id: P42 ES010337
  • Agency: NIDDK NIH HHS, United States
    Id: R37 DK057978
  • Agency: Howard Hughes Medical Institute, United States
  • Agency: NCI NIH HHS, United States
    Id: P30 CA014195

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GE Healthcare (tool)

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STAR (tool)

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STAR (tool)

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