Author
Lilia G. Noriega
Other affiliations: French Institute of Health and Medical Research
Bio: Lilia G. Noriega is an academic researcher from École Polytechnique Fédérale de Lausanne. The author has contributed to research in topics: Medicine & Adipose tissue. The author has an hindex of 17, co-authored 45 publications receiving 2317 citations. Previous affiliations of Lilia G. Noriega include French Institute of Health and Medical Research.
Papers
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TL;DR: It is shown here that TGR5 signaling induces intestinal glucagon-like peptide-1 (GLP-1) release, leading to improved liver and pancreatic function and enhanced glucose tolerance in obese mice, and suggested that pharmacological targeting of T GR5 may constitute a promising incretin-based strategy for the treatment of diabesity and associated metabolic disorders.
1,412 citations
TL;DR: The current knowledge on BA receptors is discussed, with a strong focus on the cell membrane receptor TGR5, which emerges as a valuable target for intervention in metabolic diseases.
323 citations
TL;DR: It is demonstrated that SIRT1 expression is tightly controlled at the transcriptional level by nutrient availability and further underscore that Sirt1 is a crucial metabolic checkpoint connecting the energetic status with transcriptional programmes.
Abstract: The nicotinamide adenine dinucleotide (NAD(+))-dependent deacetylase SIRT1 is a major metabolic regulator activated by energy stresses such as fasting or calorie restriction. SIRT1 activation during fasting not only relies on the increase in the NAD(+)/NADH ratio caused by energy deprivation but also involves an upregulation of SIRT1 mRNA and protein levels in various metabolic tissues. We demonstrate that SIRT1 expression is controlled systemically by the activation of the cyclic AMP response-element-binding protein upon low nutrient availability. Conversely, in the absence of energetic stress, the carbohydrate response-element-binding protein represses the expression of SIRT1. Altogether, these results demonstrate that SIRT1 expression is tightly controlled at the transcriptional level by nutrient availability and further underscore that SIRT1 is a crucial metabolic checkpoint connecting the energetic status with transcriptional programmes.
153 citations
TL;DR: The current knowledge on BA receptors is reviewed, with a strong focus on the cell membrane receptor TGR5, which has emerged as a promising target for intervention in metabolic diseases.
Abstract: Bile acids (BAs) are amphipathic molecules that facilitate the uptake of lipids, and their levels fluctuate in the intestines as well as in the circulation depending on food intake. Besides their role in dietary lipid absorption, BAs function as signaling molecules that activate specific BA receptors and trigger downstream signaling cascades. The BA receptors and the signaling pathways they control are not only important in the regulation of BA synthesis and their metabolism, but they also regulate glucose homeostasis, lipid metabolism and energy expenditure - processes relevant in the context of the metabolic syndrome. In addition to the function of the nuclear receptor FXRα in regulating local effects of BAs in the organs of the enterohepatic axis, increasing evidence points to a crucial role of the G-protein-coupled receptor TGR5 in mediating systemic actions of BAs. Here we review the current knowledge on BA receptors, with a strong focus on the cell membrane receptor TGR5, which has emerged as a promising target for intervention in metabolic diseases.
133 citations
TL;DR: Although a global protein hypersuccinylation and elevated serum ammonia during fasting were observed in the Sirt5−/− mouse model, Sirt 5 deficiency did not lead to any overt metabolic abnormalities under either chow or high fat diet conditions, suggesting that Sirt4 is likely to be dispensable for the metabolic homeostasis under the basal conditions.
Abstract: Sirt5, localized in the mitochondria, is a member of sirtuin family of NAD+-dependent deacetylases. Sirt5 was shown to deacetylate and activate carbamoyl phosphate synthase 1. Most recently, Sirt5 was reported to be the predominant protein desuccinylase and demalonylase in the mitochondria because the ablation of Sirt5 enhanced the global succinylation and malonylation of mitochondrial proteins, including many metabolic enzymes. In order to determine the physiological role of Sirt5 in metabolic homeostasis, we generated a germline Sirt5 deficient (Sirt5−/−) mouse model and performed a thorough metabolic characterization of this mouse line. Although a global protein hypersuccinylation and elevated serum ammonia during fasting were observed in our Sirt5−/− mouse model, Sirt5 deficiency did not lead to any overt metabolic abnormalities under either chow or high fat diet conditions. These observations suggest that Sirt5 is likely to be dispensable for the metabolic homeostasis under the basal conditions.
111 citations
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TL;DR: Through increased knowledge of the mechanisms involved in the interactions between the microbiota and its host, the world will be in a better position to develop treatments for metabolic disease.
Abstract: The link between the microbes in the human gut and the development of obesity, cardiovascular disease and metabolic syndromes, such as type 2 diabetes, is becoming clearer. However, because of the complexity of the microbial community, the functional connections are less well understood. Studies in both mice and humans are helping to show what effect the gut microbiota has on host metabolism by improving energy yield from food and modulating dietary or the host-derived compounds that alter host metabolic pathways. Through increased knowledge of the mechanisms involved in the interactions between the microbiota and its host, we will be in a better position to develop treatments for metabolic disease.
3,436 citations
TL;DR: Future studies will focus on understanding the mechanisms underlying the microbiota-gut-brain axis and attempt to elucidate microbial-based intervention and therapeutic strategies for neuropsychiatric disorders.
Abstract: The importance of the gut-brain axis in maintaining homeostasis has long been appreciated. However, the past 15 yr have seen the emergence of the microbiota (the trillions of microorganisms within ...
1,775 citations
TL;DR: The mammalian sirtuin protein family (comprising SIRT1–SIRT7) has received much attention for its regulatory role, mainly in metabolism and ageing, thereby acting as crucial regulators of the network that controls energy homeostasis and as such determines healthspan.
Abstract: Since the beginning of the century, the mammalian sirtuin protein family (comprising SIRT1-SIRT7) has received much attention for its regulatory role, mainly in metabolism and ageing. Sirtuins act in different cellular compartments: they deacetylate histones and several transcriptional regulators in the nucleus, but also specific proteins in other cellular compartments, such as in the cytoplasm and in mitochondria. As a consequence, sirtuins regulate fat and glucose metabolism in response to physiological changes in energy levels, thereby acting as crucial regulators of the network that controls energy homeostasis and as such determines healthspan.
1,604 citations
TL;DR: Host metabolism can be affected through microbial modifications of bile acids, which lead to altered signaling via bile acid receptors, but also by altered microbiota composition.
1,495 citations