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Obesity (Silver Spring). 2014 May;22(5):1246-55. doi: 10.1002/oby.20634. Epub 2013 Dec 4.

Tight association between macrophages and adipocytes in obesity: implications for adipocyte preparation.

Author information

1
Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, Ohio, USA; Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, USA.

Abstract

OBJECTIVE:

To determine the cellular architecture of the inflammatory infiltrate in adipose tissue from obese mice, and identify the source of inflammatory cytokines in adipose tissue at a single cell level.

METHODS:

Adipose tissue from diet-induced obese mice was digested by collagenase treatment and fractionated by density centrifugation to obtain an adipocyte floating layer and a pellet of stromal vascular cells. The cellular architecture of the adipocyte-macrophage interaction in both intact white adipose tissue (WAT) and the separated density gradient floating layer fraction was analyzed by confocal immunohistochemistry. Cytokine expression was detected by semi-quantitative real time PCR and immunohistochemical analysis.

RESULTS:

Three dimensional image analysis of WAT and the separated "adipocyte" floating layer revealed lipid-engorged macrophages, macrophages in contact with lipid droplets and sheath-like assemblies of macrophages surrounding adipocytes. The macrophages immunostained for TNFα and to a lesser extent for the immunoregulatory cytokine IL-10. TNFα staining was associated only with macrophages indicating that macrophages and not adipocytes are the source of TNFα expression in the adipocyte floating layer.

CONCLUSION:

Macrophages form assemblies that tightly adhere to and cover adipocytes and lipid droplets. TNFα found in low density adipocyte preparations is due to contamination with macrophages.

PMID:
24376179
PMCID:
PMC3980195
DOI:
10.1002/oby.20634
[Indexed for MEDLINE]
Free PMC Article

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