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Cell Tissue Res. 2019 Oct;378(1):81-96. doi: 10.1007/s00441-019-03019-5. Epub 2019 Apr 22.

The environmental obesogen bisphenol A increases macrophage self-renewal.

Author information

1
Institute of Neurobiology, University of Ulm, Albert-Einstein-Allee, 11 89081, Ulm, Germany.
2
Institute of Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany.
3
National Research Institute of Radiobiology and Radiohygiene, Budapest, Hungary.
4
Budafok Animal Health Center Budapest, Budapest, Hungary.
5
Department of Experimental Anesthesiology, University Clinics, University of Ulm, Ulm, Germany.
6
Institute of Neurobiology, University of Ulm, Albert-Einstein-Allee, 11 89081, Ulm, Germany. tamas.roeszer@uni-ulm.de.

Abstract

Self-renewal of macrophages is important for the healthy development and replenishment of tissue-resident macrophage pools. How this mechanism is controlled by endocrine signals is still largely unexplored. Here, we show that the endocrine disruptor bisphenol A (BPA) increases macrophage self-renewal. This effect was associated with phosphorylation of extracellular signal-regulated kinase (ERK) and a slight increase in the expression of liver X receptor alpha (LXRα). We found that LXRα inhibition induced, while LXRα activation impeded, macrophage self-renewal. LXRα signaling hence may protect from excessive macrophage expansion. Self-renewing macrophages, however, had negligible LXRα expression when compared with quiescent macrophages. Accordingly, tissue-resident macrophage pools, which are dominated by quiescent macrophages, were rich in LXRα-expressing macrophages. Overall, we show that BPA increases macrophage self-renewal and that this effect, at least in part, can be inhibited by increasing LXRα expression. Since BPA is accumulated in the adipose tissue, it has the potential to increase self-renewal of adipose tissue macrophages, leading to a condition that might negatively impact adipose tissue health.

KEYWORDS:

ERK; Endocrine disruptors; LXR; Obesity; Obesogens

PMID:
31011801
DOI:
10.1007/s00441-019-03019-5

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