@article {3579, title = {Osteoprotegerin increases in metabolic syndrome and promotes adipose tissue proinflammatory changes.}, journal = {Mol Cell Endocrinol}, volume = {394}, year = {2014}, month = {2014 Aug 25}, pages = {13-20}, abstract = {

BACKGROUND: Inflammation is believed to link obesity to insulin resistance, as in the setting of metabolic syndrome (MetS). Osteoprotegerin (OPG) is a soluble protein that seems to exert proatherogenic and prodiabetogenic effects. This study aims at determining OPG levels in MetS and whether OPG might contribute to MetS development and progression.

METHODOLOGY/PRINCIPAL FINDINGS: Circulating OPG was measured in 46 patients with MetS and 63 controls, and was found significantly elevated in those with MetS. In addition, circulating and tissue OPG was significantly increased in high-fat diet (HFD) fed C57BL6 mice, which is one of the animal models for the study of MetS. To evaluate the consequences of OPG elevation, we delivered this protein to C57BL6 mice, finding that it promoted systemic and adipose tissue proinflammatory changes in association with metabolic abnormalities.

CONCLUSIONS/SIGNIFICANCE: These data suggest that OPG may trigger adipose tissue proinflammatory changes in MetS/HFD-induced obesity.

}, keywords = {Adipose Tissue, Adult, Animals, Blood Glucose, Body Mass Index, C-Reactive Protein, Case-Control Studies, Cholesterol, HDL, Cholesterol, LDL, Diet, High-Fat, Female, Humans, Inflammation, Insulin, Insulin Resistance, Male, Metabolic Syndrome X, Mice, Mice, Inbred C57BL, Middle Aged, Obesity, Osteoprotegerin, Triglycerides}, issn = {1872-8057}, doi = {10.1016/j.mce.2014.06.004}, author = {Bernardi, Stella and Fabris, Bruno and Thomas, Merlin and Toffoli, Barbara and Tikellis, Christos and Candido, Riccardo and Catena, Cristiana and Mulatero, Paolo and Barbone, Fabio and Radillo, Oriano and Zauli, Giorgio and Secchiero, Paola} } @article {1911, title = {TNF-related apoptosis-inducing ligand significantly attenuates metabolic abnormalities in high-fat-fed mice reducing adiposity and systemic inflammation.}, journal = {Clin Sci (Lond)}, volume = {123}, year = {2012}, month = {2012 Nov}, pages = {547-55}, abstract = {

TRAIL [TNF (tumour necrosis factor)-related apoptosis-inducing ligand] has recently been shown to ameliorate the natural history of DM (diabetes mellitus). It has not been determined yet whether systemic TRAIL delivery would prevent the metabolic abnormalities due to an HFD [HF (high-fat) diet]. For this purpose, 27 male C57bl6 mice aged 8 weeks were randomly fed on a standard diet, HFD or HFD+TRAIL for 12 weeks. TRAIL was delivered weekly by intraperitoneal injection. Body composition was evaluated; indirect calorimetry studies, GTT (glucose tolerance test) and ITT (insulin tolerance test) were performed. Pro-inflammatory cytokines, together with adipose tissue gene expression and apoptosis, were measured. TRAIL treatment reduced significantly the increased adiposity associated with an HFD. Moreover, it reduced significantly hyperglycaemia and hyperinsulinaemia during a GTT and it improved significantly the peripheral response to insulin. TRAIL reversed the changes in substrate utilization induced by the HFD and ameliorated skeletal muscle non-esterified fatty acids oxidation rate. This was associated with a significant reduction of pro-inflammatory cytokines together with a modulation of adipose tissue gene expression and apoptosis. These findings shed light on the possible anti-adipogenic and anti-inflammatory effects of TRAIL and open new therapeutic possibilities against obesity, systemic inflammation and T2DM (Type 2 DM).

}, keywords = {Adiposity, Animals, Apoptosis, Calorimetry, Cytokines, Dietary Fats, Energy Intake, Glucose Tolerance Test, Hyperglycemia, Hyperinsulinism, Inflammation, Inflammation Mediators, Male, Mice, Mice, Inbred C57BL, Oxidation-Reduction, Palmitic Acid, Real-Time Polymerase Chain Reaction, TNF-Related Apoptosis-Inducing Ligand}, issn = {1470-8736}, doi = {10.1042/CS20120176}, author = {Bernardi, Stella and Zauli, Giorgio and Tikellis, Christos and Candido, Riccardo and Fabris, Bruno and Secchiero, Paola and Cooper, Mark E and Thomas, Merlin C} }