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Regulatory feedback loop between NF-kappaB and MCP-1-induced protein 1 RNase

Lukasz Skalniak1, Danuta Mizgalska, Adrian Zarebski

  • 1Department of Cell Biochemistry, Faculty of Biochemistry, Jagiellonian University, Krakow, Poland.

The FEBS Journal
|September 15, 2009
PubMed

Insights

The novel ZC3H12A gene, encoding MCPIP, is induced by inflammation via NF-kappaB signaling. This discovery reveals a negative feedback loop, suggesting MCPIP

Area of Science:

  • Immunology
  • Molecular Biology
  • Gene Regulation

Background:

  • ZC3H12A, encoding Monocyte Chemoattractant Protein-1 Induced Protein 1 (MCPIP), is a novel gene.
  • MCPIP is identified in monocytes and macrophages stimulated by inflammatory signals like MCP-1 and IL-1beta.
  • ZC3H12A exhibits rapid and strong transcription induction in response to pro-inflammatory stimuli.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying ZC3H12A gene induction by Interleukin-1beta (IL-1beta).
  • To identify the signaling pathways responsible for ZC3H12A transcription activation.
  • To explore the functional role of ZC3H12A and MCPIP in inflammatory processes.

Main Methods:

  • Utilized human peripheral blood monocytes and monocyte-derived macrophages.
  • Applied stimulation with pro-inflammatory molecules including MCP-1, IL-1beta, TNF-alpha, and LPS.
  • Employed inhibition of the NF-kappaB signaling pathway to assess its role in ZC3H12A induction.
  • Analyzed the ZC3H12A gene's second intron for regulatory elements.

Main Results:

  • IL-1beta-induced ZC3H12A transcription is predominantly dependent on the NF-kappaB signaling pathway.
  • Inhibition of NF-kappaB signaling impaired ZC3H12A transcription activation.
  • Identified an IL-1beta-responsive region in the second intron of ZC3H12A containing four functional NF-kappaB-binding sites.
  • This region acts as a transcription enhancer for ZC3H12A following IL-1beta stimulation.

Conclusions:

  • A novel IL-1beta-responsive transcriptional enhancer in the ZC3H12A gene, mediated by NF-kappaB, has been identified.
  • MCPIP's role in degrading pro-inflammatory cytokine transcripts suggests a negative feedback loop in NF-kappaB activation.
  • MCPIP holds potential therapeutic significance for inflammatory diseases like diabetes and cancer linked to NF-kappaB pathway dysfunction.

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