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Related Experiment Video

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Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
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Exogenously Added Oxyphytosterols Do Not Affect Macrophage-Mediated Inflammatory Responses.

Yvonne Oligschlaeger1, Tom Houben1, Mike L J Jeurissen1

  • 1Department of Molecular Genetics, School of Nutrition & Translational Research Maastricht (NUTRIM), Maastricht University, PO Box 616, 6200 MD, Maastricht, The Netherlands.

Lipids
|May 11, 2018
PubMed
Summary

Oxidized phytosterols, specifically 7-beta-hydroxy-sitosterol/campesterol, may induce mild inflammation in macrophages. However, these effects appear independent of key receptors, suggesting limited impact in vitro.

Keywords:
Bone marrow-derived macrophagesInflammationOxyphytosterolsSitosterol

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Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • Phytosterols are known for cholesterol-lowering effects.
  • The atherogenic potential of phytosterols and their oxidized forms (oxyphytosterols) remains unclear.
  • The capacity of oxyphytosterols to induce inflammation in macrophages is not well understood.

Purpose of the Study:

  • To investigate the proinflammatory potential of oxyphytosterols in macrophages.
  • To compare the effects of different oxidized phytosterols (7keto-sit/camp and 7βOH-sit/camp) and non-oxidized phytosterol (β-sitosterol).
  • To determine the role of low-density lipoprotein receptor (LDLR) and CD36/Scavenger Receptor A (SR-A) in mediating these responses.

Main Methods:

  • Bone marrow-derived macrophages from C57Bl/6 mice were treated with oxidized low-density lipoproteins, oxyphytosterols (7keto-sit/camp, 7βOH-sit/camp), non-oxidized phytosterol (β-sitosterol), or carrier control.
  • Treatments were applied in a dose- and time-dependent manner.
  • Analysis included inflammatory cytokine release, activity, and mRNA expression levels, with investigations into LDLR and CD36/SR-A involvement.

Main Results:

  • 7-beta-hydroxy-sitosterol/campesterol (7βOH-sit/camp) induced a modest proinflammatory response in wild-type macrophages, unlike 7keto-sitosterol/campesterol (7keto-sit/camp).
  • The observed mild inflammatory effects were independent of the low-density lipoprotein receptor (LDLR) and Cluster of differentiation 36/Scavenger receptor-a (CD36/SR-A).
  • Non-oxidized phytosterol (β-sitosterol) did not elicit significant inflammatory responses.

Conclusions:

  • Exogenously added oxyphytosterols do not appear to significantly impact macrophage-mediated inflammatory responses in vitro.
  • The specific oxidized form, 7βOH-sit/camp, showed a mild inflammatory capacity, but its mechanism is not dependent on LDLR or CD36/SR-A.
  • Further research may be needed to fully elucidate the role of oxyphytosterols in atherogenesis.