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A signaling pathway by a new synthetic lipid A analog, ONO-4007, in RAW264.7 cells

Yukoh Saito1, Yasuhiro Kuramitsu, Hirofumi Arai

  • 1Department of Oral and Maxillofacial Surgery, Yamaguchi University School of Medicine, Yamaguchi 755-8505, Japan.

Anti-Cancer Drugs
|November 20, 2002
PubMed

Insights

ONO-4007, a novel lipid A derivative, activates macrophages to produce tumor necrosis factor-alpha (TNF-alpha). This biological response modifier shows potential for treating TNF-alpha-sensitive tumors.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • ONO-4007 is a synthetic lipid A derivative with low endotoxic activity.
  • It has potential as a biological response modifier for treating tumors sensitive to tumor necrosis factor-alpha (TNF-alpha).

Purpose of the Study:

  • To investigate the activation of murine macrophage cell line RAW264.7 by ONO-4007.
  • To elucidate the signaling pathway involved in ONO-4007-induced macrophage activation and TNF-alpha production.

Main Methods:

  • Stimulation of RAW264.7 cells with ONO-4007 at various concentrations and time points.
  • Measurement of TNF-alpha production using standard assays.
  • Analysis of mitogen-activated protein kinase (MAPK) activation, specifically P38 and ERK1, via tyrosine phosphorylation.

Main Results:

  • ONO-4007 activated RAW264.7 cells, leading to significant TNF-alpha production after 24 hours of stimulation.
  • Short-term stimulation (less than 15 minutes) did not induce TNF-alpha production.
  • ONO-4007 induced rapid tyrosine phosphorylation of ERK1 within 5-15 minutes, while P38 phosphorylation was not observed.
  • ERK1 phosphorylation decreased significantly after 15 minutes and was minimal by 60 minutes.

Conclusions:

  • ONO-4007 rapidly stimulates RAW264.7 cells, inducing ERK1 tyrosine phosphorylation.
  • The observed signaling pathway suggests similarities to lipopolysaccharide (LPS) activation.
  • These findings support the potential of ONO-4007 as a biological response modifier for TNF-alpha-sensitive tumors.

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