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Isolation, Characterization, and Purification of Macrophages from Tissues Affected by Obesity-related Inflammation
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Macrophage lipoprotein lipase modulates the development of atherosclerosis but not adiposity

Manabu Takahashi1, Hiroaki Yagyu, Fumiko Tazoe

  • 1Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan.

Journal of Lipid Research
|February 5, 2013
PubMed

Insights

Macrophage lipoprotein lipase (LpL) is crucial for atherosclerosis development but not adiposity. Removing LpL from macrophages reduced cholesterol ester formation and atherosclerosis in mice.

Area of Science:

  • Biochemistry
  • Immunology
  • Cardiovascular Research

Background:

  • Atherosclerosis is a chronic inflammatory disease characterized by lipid accumulation in artery walls.
  • Macrophage lipoprotein lipase (LpL) is implicated in lipid metabolism and inflammatory processes within macrophages.

Purpose of the Study:

  • To investigate the specific role of macrophage LpL in the development of atherosclerosis and adiposity.
  • To elucidate the mechanisms by which macrophage LpL influences lipid handling and inflammatory responses.

Main Methods:

  • Generation of macrophage LpL knockout (MLpLKO) mice using cre-loxP gene targeting.
  • In vitro studies involving incubation of macrophages with VLDL and β-VLDL.
  • In vivo studies using MLpLKO/ApoEKO mice fed a Western-type diet to assess atherosclerosis and adiposity.

Main Results:

  • Loss of macrophage LpL did not affect plasma LpL activity or lipoprotein levels.
  • Macrophage LpL deficiency reduced cholesteryl ester formation and intracellular triglyceride levels in macrophages incubated with VLDL.
  • MLpLKO/ApoEKO mice exhibited significantly reduced atherosclerosis compared to ApoEKO controls, despite comparable hypercholesterolemia and no difference in fat mass or inflammation markers.

Conclusions:

  • Macrophage LpL plays a significant role in promoting atherosclerosis development.
  • Macrophage LpL does not appear to influence adiposity or systemic inflammation in this model.

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