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The transcriptional repressor Hes1 attenuates inflammation by regulating transcription elongation.


ABSTRACT: Most of the known regulatory mechanisms that curb inflammatory gene expression target pre-transcription-initiation steps, and evidence for post-initiation regulation of inflammatory gene expression remains scarce. We found that the transcriptional repressor Hes1 suppressed production of CXCL1, a chemokine that is crucial for recruiting neutrophils. Hes1 negatively regulated neutrophil recruitment in vivo in a manner that was dependent on macrophage-produced CXCL1, and it attenuated the severity of inflammatory arthritis. Mechanistically, inhibition of Cxcl1 expression by Hes1 did not involve modification of transcription initiation. Instead, Hes1 inhibited signal-induced recruitment of the positive transcription-elongation complex P-TEFb and thereby prevented phosphorylation of RNA polymerase II at Ser2 and productive elongation. Thus, our results identify Hes1 as a homeostatic suppressor of inflammatory responses that exerts its suppressive function by regulating transcription elongation.

SUBMITTER: Shang Y 

PROVIDER: S-EPMC4955730 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature

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The transcriptional repressor Hes1 attenuates inflammation by regulating transcription elongation.

Shang Yingli Y   Coppo Maddalena M   He Teng T   Ning Fei F   Yu Li L   Kang Lan L   Zhang Bin B   Ju Chanyang C   Qiao Yu Y   Zhao Baohong B   Gessler Manfred M   Rogatsky Inez I   Hu Xiaoyu X  

Nature immunology 20160620 8


Most of the known regulatory mechanisms that curb inflammatory gene expression target pre-transcription-initiation steps, and evidence for post-initiation regulation of inflammatory gene expression remains scarce. We found that the transcriptional repressor Hes1 suppressed production of CXCL1, a chemokine that is crucial for recruiting neutrophils. Hes1 negatively regulated neutrophil recruitment in vivo in a manner that was dependent on macrophage-produced CXCL1, and it attenuated the severity  ...[more]

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