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[Bidirectional regulation of Pam3CSK4?induced inflammatory response by ATP?binding cassette transporter A1 knockdown

Yue Li1, Xi Lan, Li-Tao Wu

  • 11Department of Biochemistry and Molecular Biology, 2Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Centre, Xi'an710061, China.

Nan Fang Yi Ke Da Xue Xue Bao = Journal of Southern Medical University
|January 3, 2018
PubMed
Abstract

Insights

ATP-binding cassette transporter A1 (ABCA1) knockdown in macrophages up-regulates pro-inflammatory cytokines and enhances transcription factor ATF3 expression. This suggests ABCA1 knockdown has dual pro- and anti-inflammatory effects.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • ATP-binding cassette transporter A1 (ABCA1) plays a role in cellular lipid efflux.
  • Macrophages are key immune cells involved in inflammatory responses.
  • Toll-like receptor 2 (TLR2) ligands, such as Pam3CSK4, trigger inflammatory pathways in macrophages.

Purpose of the Study:

  • To investigate the regulatory effect of ABCA1 knockdown on Pam3CSK4-induced inflammatory response in mouse RAW264.7 macrophages.
  • To analyze the impact of ABCA1 knockdown on the expression of pro-inflammatory and anti-inflammatory cytokines.
  • To examine the effect of ABCA1 knockdown on the expression of activating transcription factor (ATF) family members.

Main Methods:

  • Stable ABCA1 knockdown was established in the mouse RAW264.7 macrophage cell line.
  • Cells were stimulated with the TLR2 ligand Pam3CSK4.
  • Transcriptional levels of cytokines and ATF proteins were analyzed.

Main Results:

  • ABCA1 knockdown significantly up-regulated Pam3CSK4-induced expression of IL-1β, TNF-α, and IL-6.
  • ABCA1 knockdown enhanced the expression of transcription factor cAMP-dependent transcription factor 3 (ATF3).
  • Expressions of ATF1, ATF2, ATF4, and ATF5 were not significantly affected by ABCA1 knockdown.

Conclusions:

  • ABCA1 knockdown in macrophages may exert both pro-inflammatory and anti-inflammatory effects.
  • ABCA1 knockdown up-regulates ATF3 transcription, potentially via a distinct mechanism compared to other ATF family members.

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