Abstract:
:Diabetes and obesity are two metabolic diseases characterized by insulin resistance and a low-grade inflammation. Seeking an inflammatory factor causative of the onset of insulin resistance, obesity, and diabetes, we have identified bacterial lipopolysaccharide (LPS) as a triggering factor. We found that normal endotoxemia increased or decreased during the fed or fasted state, respectively, on a nutritional basis and that a 4-week high-fat diet chronically increased plasma LPS concentration two to three times, a threshold that we have defined as metabolic endotoxemia. Importantly, a high-fat diet increased the proportion of an LPS-containing microbiota in the gut. When metabolic endotoxemia was induced for 4 weeks in mice through continuous subcutaneous infusion of LPS, fasted glycemia and insulinemia and whole-body, liver, and adipose tissue weight gain were increased to a similar extent as in high-fat-fed mice. In addition, adipose tissue F4/80-positive cells and markers of inflammation, and liver triglyceride content, were increased. Furthermore, liver, but not whole-body, insulin resistance was detected in LPS-infused mice. CD14 mutant mice resisted most of the LPS and high-fat diet-induced features of metabolic diseases. This new finding demonstrates that metabolic endotoxemia dysregulates the inflammatory tone and triggers body weight gain and diabetes. We conclude that the LPS/CD14 system sets the tone of insulin sensitivity and the onset of diabetes and obesity. Lowering plasma LPS concentration could be a potent strategy for the control of metabolic diseases.
journal_name
Diabetesjournal_title
Diabetesauthors
Cani PD,Amar J,Iglesias MA,Poggi M,Knauf C,Bastelica D,Neyrinck AM,Fava F,Tuohy KM,Chabo C,Waget A,Delmée E,Cousin B,Sulpice T,Chamontin B,Ferrières J,Tanti JF,Gibson GR,Casteilla L,Delzenne NM,Alessi MC,Burcelidoi
10.2337/db06-1491subject
Has Abstractpub_date
2007-07-01 00:00:00pages
1761-72issue
7eissn
0012-1797issn
1939-327Xpii
db06-1491journal_volume
56pub_type
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