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Suppression of activation and induction of apoptosis in RAW264.7 cells by amniotic membrane extract

Hua He1, Wei Li, Szu-Yu Chen

  • 1TissueTech, Inc and the Ocular Surface Center, Miami, Florida 33173, USA.

Investigative Ophthalmology & Visual Science
|July 11, 2008
PubMed
Abstract

Insights

Amniotic membrane extract (AME) reduces macrophage activation and promotes apoptosis, retaining the anti-inflammatory properties of amniotic membrane. This suggests AME can help control inflammation and prevent tissue damage.

Area of Science:

  • Immunology
  • Cell Biology
  • Tissue Engineering

Background:

  • Macrophages are key immune cells involved in inflammation, but uncontrolled activity can lead to tissue damage.
  • Amniotic membrane transplantation is clinically used to reduce ocular inflammation.
  • Previous studies suggest amniotic membrane induces macrophage apoptosis, but its extract's activity is unknown.

Purpose of the Study:

  • To investigate the anti-inflammatory potential of amniotic membrane extract (AME) on macrophages.
  • To determine if AME retains the macrophage-modulating properties of amniotic membrane.

Main Methods:

  • Murine macrophage cell line RAW264.7 were treated with AME.
  • Cells were activated with interferon-gamma (IFN-gamma) and lipopolysaccharide (LPS).
  • Assessed cell morphology, actin filament content, cell surface marker expression, proliferation, apoptosis, and cytokine secretion.

Main Results:

  • AME suppressed macrophage spreading and reduced actin filaments.
  • AME downregulated key activation markers (CD80, CD86, MHC class 2) and inhibited cell growth.
  • AME enhanced macrophage apoptosis and modulated cytokine profiles, reducing TNF-alpha and IL-6 while increasing IL-10.

Conclusions:

  • Amniotic membrane extract (AME) exhibits significant anti-inflammatory effects on macrophages.
  • AME suppresses macrophage activation and induces apoptosis, mirroring the effects of the amniotic membrane.
  • AME holds potential for managing inflammatory conditions by modulating macrophage behavior.

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