6533b7d0fe1ef96bd125b9c9

RESEARCH PRODUCT

Increased dosage of Ink4/Arf protects against glucose intolerance and insulin resistance associated with aging

Maria-jesus SanzDeborah J. BurksManuel SerranoMercedes DelgadoVicente AndrésHerminia González-navarroMiguel A. PozoÁNgela Vinué

subject

p16ink4amedicine.medical_specialtyAgingGlucose uptakemedicine.medical_treatmentMice TransgenicCarbohydrate metabolismCDKN2BMiceCDKN2AInsulin resistanceInsulin receptor substrateInternal medicineDiabetes mellitusinsulin resistanceGlucose IntolerancemedicineGlucose homeostasisAnimalsInsulininsulin signalingCyclin-Dependent Kinase Inhibitor p16biologydiabetesADP-Ribosylation FactorsInsulin18F-fluorodeoxyglucose-PETARFCell Biologypancreatic isletmedicine.diseaseMice Inbred C57BLInsulin receptorEndocrinologyGlucosebiology.proteinInsulin Resistancep15ink4bGenome-Wide Association Study

description

Recent genome-wide association studies have linked type-2 diabetes mellitus to a genomic region in chromosome 9p21 near the Ink4/Arf locus, which encodes tumor suppressors that are up-regulated in a variety of mammalian organs during aging. However, it is unclear whether the susceptibility to type-2 diabetes is associated with altered expression of the Ink4/Arf locus. In the present study, we investigated the role of Ink4/Arf in age-dependent alterations of insulin and glucose homeostasis using Super-Ink4/Arf mice which bear an extra copy of the entire Ink4/Arf locus. We find that, in contrast to age-matched wild-type controls, Super-Ink4/Arf mice do not develop glucose intolerance with aging. Insulin tolerance tests demonstrated increased insulin sensitivity in Super-Ink4/Arf compared with wild-type mice, which was accompanied by higher activation of the insulin receptor substrate (IRS)-PI3K-AKT pathway in liver, skeletal muscle and heart. Glucose uptake studies in Super-Ink4/Arf mice showed a tendency toward increased (18)F-fluorodeoxyglucose uptake in skeletal muscle compared with wild-type mice (P = 0.079). Furthermore, a positive correlation between glucose uptake and baseline glucose levels was observed in Super-Ink4/Arf mice (P < 0.008) but not in wild-type mice. Our studies reveal a protective role of the Ink4/Arf locus against the development of age-dependent insulin resistance and glucose intolerance. Work supported by grants from the Spanish Ministry of Economy and Competiveness (MINECO) and European Regional Development Fund (SAF2007-62110, SAF2010-16044, SAF2008-0011, SAF2011-23777), and from the Instituto de Salud Carlos III (FIS: PI-CP10/00555, RECAVA: RD06/0014/0021, and EMER07-12). H.G.-N. is an investigator from ‘Miguel Servet’ programme (CP10/00555) and A.V. from MINECO. The Centro Nacional de Investigaciones Cardiovasculares (CNIC) is supported by the MINECO and the Pro-CNIC Foundation. Sí

yearjournalcountryeditionlanguage
2013-01-01
https://fundanet.cipf.es/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=2053