Groupes de recherche

[934] Laboratoire des maladies métaboliques

Department of Cell Physiology and Metabolism

Mirko Trajkovski - Laboratory of Metabolic Health 

Adipose tissue plasticity and gut microbiota in obesity and insulin resistance.

Welcome to the homepage of the Laboratory of Metabolic Health. The main interests of our lab are the molecular mechanisms underlining metabolic diseases, primarily obesity and insulin resistance. Mammals have two types of fat: brown and white, with opposing functions. The white fat is an important regulator of the whole body homeostasis that also serves to store energy in the form of triglycerides. The main function of the brown fat is to burn lipids in order to produce heat, a function that can be induced by cold exposure or diet. Brown fat cells also emerge in the subcutaneous white fat (known as “beige” cells) in a process referred to as fat browning. Recent evidence strongly supports the existence of functional brown and beige fat in adult humans. Promotion of increased brown fat development in humans and experimental mice leads to increased energy expenditure without causing dysfunction in other tissues, suggesting the manipulation of the fat stores as an important therapeutic objective. 

 

The intestinal microbiota co-develops with the host, and its composition is influenced by several physiological changes. The microbiota influences the whole-body metabolism by affecting energy balance implying the gut microbiota as a key player mediating the tight control of the energy homeostasis. One part of our research is focused on the role of the gut microbiota in regulating the metabolic health, and in particular the response of the host to the changes in the gut microbiota composition. Research interests include immunometabolism and the roles of the adipose tissue and the gut in the regulation of metabolism. The projects involve using state-of-art technologies and in vivo animal models, in vitro systems, cohorts of human patients, and linage tracing studies, generally aiming at developing strategies for treatment of dyslipidemia, diabetes and obesity. A deeper understanding of these axes is a prerequisite for optimizing therapeutic strategies to manipulate the gut microbiota and the host response to combat disease and improve health.

 

For further reading please see the Publications from our lab

 

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Figure legend: 

Cold exposure leads to marked shift of the microbiota composition. Transplantation of this cold microbiota to germ-free (GF) mice (mice born and raised in aseptic conditions and without their own microbiota) is sufficient to induce tolerance to cold of the GF recipients, improved insulin sensitivity, increased energy expenditure and to lower the fat content  – an effect in part mediated by the activation of the brown fat and the browning of the white fat depots in the cold microbiota-transplanted mice. This indicates an existence of a microbiota-fat signaling axis that contributes to the brown and beige fat development; however, the microbial composition and signals mediating this process are not understood.