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Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
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C/EBPβ in bone marrow is essential for diet induced inflammation, cholesterol balance, and atherosclerosis

Shaikh M Rahman1, Karalee C Baquero2, Mahua Choudhury3

  • 1Department of Nutritional Sciences, Texas Tech University, Lubbock, TX, USA.

Atherosclerosis
|April 14, 2016
PubMed

Insights

CCAAT/enhancer-binding protein beta (C/EBPβ) in hematopoietic cells is crucial for regulating diet-induced inflammation, hyperlipidemia, and atherosclerosis. Its absence reduces lipid levels, inflammatory responses, and aortic lesion formation.

Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Metabolic Disorders

Background:

  • Atherosclerosis is a chronic inflammatory disease linked to lipid metabolism disorders.
  • CCAAT/enhancer-binding protein beta (C/EBPβ) influences hematopoietic cell development and lipid metabolism.
  • The specific role of C/EBPβ in atherosclerotic progression remains unexamined.

Purpose of the Study:

  • To investigate the impact of hematopoietic C/EBPβ deletion on atherosclerosis development.
  • To assess the effects on hyperlipidemia, inflammatory responses, and aortic lesion formation in ApoE(-/-) mice.

Main Methods:

  • ApoE(-/-) mice were reconstituted with wild-type (WT) or C/EBPβ(-/-) bone marrow cells.
  • Mice were fed either a low-fat or high-fat/high-cholesterol diet for 11 weeks.
  • C/EBPβ was silenced in RAW264.7 macrophage cells to study foam cell formation and cytokine secretion.

Main Results:

  • Hematopoietic C/EBPβ deletion reduced blood and hepatic lipids, altering key lipid metabolism gene expression.
  • Cytokine levels were significantly reduced, and aortic lesion area decreased in mice lacking hematopoietic C/EBPβ.
  • Silencing C/EBPβ in macrophages prevented oxLDL-mediated foam cell formation and inflammatory cytokine release.

Conclusions:

  • C/EBPβ in hematopoietic cells plays a critical role in regulating diet-induced inflammation, hyperlipidemia, and atherosclerosis.
  • Targeting C/EBPβ in hematopoietic cells may offer a therapeutic strategy for atherosclerosis.
Abstract

Keywords:
AtherosclerosisBile acidCholesterol effluxCytokineHematopoietic stem cellInflammationMacrophage foam cells

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