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Mitogen-induced transcriptional programming in human fibroblasts.

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Mitogen- and stress-activated kinases (MSK) regulate gene expression during cell proliferation. This study used RNA sequencing to identify immediate-early genes controlled by MSK, revealing MSK

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Immediate-early genesMitogen- and stress-activated protein kinaseProtein kinase ARNA sequencingTranscriptome

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gene Regulation

Background:

  • The RAS-MAPK pathway controls cell proliferation by initiating gene transcription.
  • Mitogen- and stress-activated kinases (MSK) 1 and 2 phosphorylate histone H3, facilitating transcription of immediate-early genes.
  • Understanding MSK's role in gene regulation is crucial for deciphering proliferation control.

Purpose of the Study:

  • To investigate the role of MSK in regulating immediate-early gene expression.
  • To identify specific genes whose induction is dependent on MSK activity.
  • To differentiate MSK-dependent from MSK-independent transcriptional responses.

Main Methods:

  • Transcriptome analysis using RNA sequencing on human fibroblast cells (CCD-1070Sk).
  • Stimulation of cells with epidermal growth factor (EGF) or phorbol ester (TPA).
  • Inhibition of MSK/PKA activity using H89 and Rp-cAMPS.

Main Results:

  • Many immediate-early genes were induced independently of MSK activity.
  • MSK inhibition with H89 attenuated the induction of several immediate-early genes, a finding corroborated by PKA inhibition.
  • H89, but not Rp-cAMPS, further upregulated EGF-induced transcriptional repressor genes, suggesting MSK modulates their induction levels.

Conclusions:

  • MSK plays a role in modulating the induction of specific immediate-early genes, including transcriptional repressors.
  • The study distinguishes MSK-dependent and independent pathways in immediate-early gene regulation.
  • Findings contribute to understanding the intricate mechanisms of cell proliferation control.