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Experimental Analysis of Apoptotic Thymocyte Engulfment by Macrophages
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Experimental Analysis of Apoptotic Thymocyte Engulfment by Macrophages

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Phagocytic Activation of Macrophages with Serum MAF Depends on Engulfment Efficiency and Not Migratory Activity

Riho Mashiba1, Mami Ishikawa1, Y U Sumiya1,2

  • 1Frontiers of Innovative Research in Science and Technology (FIRST), Konan University, Kobe, Japan.

Anticancer Research
|July 5, 2018
PubMed
Abstract

Insights

Serum-derived macrophage activating factor (serum MAF) enhances macrophage phagocytosis by increasing engulfment efficiency, not migration. This finding clarifies how serum MAF boosts cancer immunity via macrophage activation.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Serum-derived macrophage activating factor (serum MAF) is implicated in enhancing macrophage phagocytic activity.
  • Serum MAF may play a role in cancer immunity by modulating immune cell function.

Purpose of the Study:

  • To investigate the specific mechanisms by which serum MAF enhances macrophage phagocytic activity.
  • To differentiate the effects of serum MAF on macrophage migration versus engulfment efficiency.

Main Methods:

  • THP-1 macrophages were stimulated with 12-O-tetradecanoyl-13-acetate (TPA).
  • Macrophage migratory activity was assessed using time-lapse imaging.
  • Engulfment efficiency was quantified via a suspension assay using beads.

Main Results:

  • Serum MAF treatment did not alter the migratory distance of THP-1 macrophages.
  • A significant increase in the efficiency of bead internalization was observed in serum MAF-treated macrophages.

Conclusions:

  • The phagocytic activation of macrophages by serum MAF is primarily due to enhanced engulfment efficiency.
  • This study provides insights into immune system activation through macrophage phagocytosis, relevant for cancer immunotherapy.
Keywords:
THP-1pH-sensitive chromophoreserum MAF (serum-derived macrophage activating factor)suspension assaytime-lapse image analysis

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