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01-03-2014 | Article

Local proliferation of macrophages in adipose tissue during obesity-induced inflammation

Authors: Julia Haase, Ulrike Weyer, Kerstin Immig, Nora Klöting, Matthias Blüher, Jens Eilers, Ingo Bechmann, Martin Gericke

Published in: Diabetologia | Issue 3/2014

Abstract

Aims/hypothesis

Obesity is frequently associated with low-grade inflammation of adipose tissue (AT), and the increase in adipose tissue macrophages (ATMs) is linked to an increased risk of type 2 diabetes. Macrophages have been regarded as post-mitotic, but recent observations have challenged this view. In this study, we tested the hypothesis that macrophages proliferate within AT in diet-induced obesity in mice and humans.

Methods

We studied the expression of proliferation markers by immunofluorescence, PCR and flow cytometry in three different models of mouse obesity as well as in humans (n = 239). The cell fate of dividing macrophages was assessed by live imaging of AT explants.

Results

We show that ATMs undergo mitosis within AT, predominantly within crown-like structures (CLS). We found a time-dependent increase in ATM proliferation when mice were fed a high-fat diet. Upregulation of CD206 and CD301 in proliferating ATMs indicated preferential M2 polarisation. Live imaging within AT explants from mice revealed that macrophages emigrate out of the CLS to become resident in the interstitium. In humans, we confirmed the increased expression of proliferation markers of CD68⁺ macrophages in CLS and demonstrated a higher mRNA expression of the proliferation marker Ki67 in AT from obese patients.

Conclusions/interpretation

Local proliferation contributes to the increase in M2 macrophages in AT. Our data confirm CLS as the primary site of proliferation and a new source of ATMs and support a model of different recruitment mechanisms for classically activated (M1) and alternatively activated (M2) macrophages in obesity.

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Title: Local proliferation of macrophages in adipose tissue during obesity-induced inflammation
Authors: Julia Haase
Ulrike Weyer
Kerstin Immig
Nora Klöting
Matthias Blüher
Jens Eilers
Ingo Bechmann
Martin Gericke
Publication date: 01-03-2014
Publisher: Springer Berlin Heidelberg
Published in: Diabetologia / Issue 3/2014
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-013-3139-y

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