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Int J Obes (Lond). 2018 Mar;42(3):507-517. doi: 10.1038/ijo.2017.224. Epub 2017 Sep 13.

A history of obesity leaves an inflammatory fingerprint in liver and adipose tissue.

Author information

1
JRG Adipocytes and Metabolism, Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Center Munich, Garching, Germany.
2
German Center for Diabetes Research (DZD), München-Neuherberg, Germany.
3
Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany.
4
Institute for Experimental Genetics, Helmholtz Zentrum München, München-Neuherberg, Germany.
5
Medizinische Klinik und Poliklinik IV der LMU, Munich, Germany.
6
Institute for Diabetes and Regeneration, Helmholtz Diabetes Center at Helmholtz Zentrum München, Garching, Germany.
7
Institute for Pathology, Helmholtz Zentrum München, München-Neuherberg, Germany.
8
Technische Universität München, Lehrstuhl für Experimentelle Genetik, Freising, Germany.
9
Institute for Diabetes and Obesity, Helmholtz Diabetes Center at Helmholtz Zentrum München, Garching, Germany.

Abstract

BACKGROUND/OBJECTIVES:

Dieting is a popular yet often ineffective way to lower body weight, as the majority of people regain most of their pre-dieting weights in a relatively short time. The underlying molecular mechanisms driving weight regain and the increased risk for metabolic disease are still incompletely understood. Here we investigate the molecular alterations inherited from a history of obesity.

METHODS:

In our model, male high-fat diet (HFD)-fed obese C57BL/6J mice were switched to a low caloric chow diet, resulting in a decline of body weight to that of lean mice. We measured body composition, as well as metrics of glucose, insulin and lipid homeostasis. This was accompanied by histological and gene expression analysis of adipose tissue and liver to assess adipose tissue inflammation and hepatosteatosis. Moreover, acute hypothalamic response to (re-) exposure to HFD was assessed by qPCR.

RESULTS & CONCLUSIONS:

Within 7 weeks after diet switch, most obesity-associated phenotypes, such as body mass, glucose intolerance and blood metabolite levels were reversed. However, hepatic inflammation, hepatic steatosis as well as hypertrophy and inflammation of perigonadal, but not subcutaneous, adipocytes persisted in formerly obese mice. Transcriptional profiling of liver and perigonadal fat revealed an upregulation of pathways associated with immune function and cellularity. Thus, we show that weight reduction leaves signs of inflammation in liver and perigonadal fat, indicating that persisting proinflammatory signals in liver and adipose tissue could contribute to an increased risk of formerly obese subjects to develop the metabolic syndrome upon recurring weight gain.

PMID:
28901330
PMCID:
PMC5880583
DOI:
10.1038/ijo.2017.224
[Indexed for MEDLINE]
Free PMC Article

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