Phenotypic Screen Identifies JAK2 as a Major Regulator of FAT10 Expression.

Abstract:

:FAT10 is a ubiquitin-like protein suggested to target proteins for proteasomal degradation. It is highly upregulated upon pro-inflammatory cytokines, namely, TNFα, IFNγ, and IL6, and was found to be highly expressed in various epithelial cancers. Evidence suggests that FAT10 is involved in cancer development and may have a pro-tumorigenic role. However, its biological role is still unclear, as well as its biochemical and cellular regulation. To identify pathways underlying FAT10 expression in the context of pro-inflammatory stimulation, which characterizes the cancerous environment, we implemented a phenotypic transcriptional reporter screen with a library of annotated compounds. We identified AZ960, a potent JAK2 inhibitor, which significantly downregulates FAT10 under pro-inflammatory cytokines induction, in an NFκB-independent manner. We validated JAK2 as a major regulator of FAT10 expression via knockdown, and we suggest that the transcriptional effects are mediated through pSTAT1/3/5. Overall, we have elucidated a pathway regulating FAT10 transcription and discovered a tool compound to chemically downregulate FAT10 expression, and to further study its biology.

journal_name

ACS Chem Biol

journal_title

ACS chemical biology

authors

Reznik N,Kozer N,Eisenberg-Lerner A,Barr H,Merbl Y,London N

doi

10.1021/acschembio.9b00667

subject

Has Abstract

pub_date

2019-12-20 00:00:00

pages

2538-2545

issue

12

eissn

1554-8929

issn

1554-8937

journal_volume

14

pub_type

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