title: Long-lived crowded-litter mice exhibit lasting effects on insulin sensitivity and energy homeostasis.
abstract: The action of nutrients on early postnatal growth can influence mammalian aging and longevity. Recent work has demonstrated that limiting nutrient availability in the first 3 wk of life [by increasing the number of pups in the crowded-litter (CL) model] leads to extension of mean and maximal lifespan in genetically normal mice. In this study, we aimed to characterize the impact of early-life nutrient intervention on glucose metabolism and energy homeostasis in CL mice. In our study, we used mice from litters supplemented to 12 or 15 pups and compared those to control litters limited to eight pups. At weaning and then throughout adult life, CL mice are significantly leaner and consume more oxygen relative to control mice. At 6 mo of age, CL mice had low fasting leptin concentrations, and low-dose leptin injections reduced body weight and food intake more in CL female mice than in controls. At 22 mo, CL female mice also have smaller adipocytes compared with controls. Glucose and insulin tolerance tests show an increase in insulin sensitivity in 6 mo old CL male mice, and females become more insulin sensitive later in life. Furthermore, β-cell mass was significantly reduced in the CL male mice and was associated with reduction in β-cell proliferation rate in these mice. Together, these data show that early-life nutrient intervention has a significant lifelong effect on metabolic characteristics that may contribute to the increased lifespan of CL mice.
authors.affiliation: Department of Internal Medicine, Division of Geriatric and Palliative Medicine, University of Michigan, Ann Arbor, Michigan; msadagur@med.umich.edu.
authors.forename: Marianna
authors.initials: M
authors.lastname: Sadagurski
authors.affiliation: Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, Michigan;
authors.forename: Taylor
authors.initials: T
authors.lastname: Landeryou
authors.affiliation: Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, Michigan;
authors.forename: Manuel
authors.initials: M
authors.lastname: Blandino-Rosano
authors.affiliation: Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, Michigan;
authors.forename: Gillian
authors.initials: G
authors.lastname: Cady
authors.affiliation: Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, Michigan;
authors.forename: Lynda
authors.initials: L
authors.lastname: Elghazi
authors.affiliation: Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, Michigan;
authors.forename: Daniel
authors.initials: D
authors.lastname: Meister
authors.affiliation: Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, Michigan;
authors.forename: Lauren
authors.initials: L
authors.lastname: See
authors.affiliation: Department of Internal Medicine-Geriatrics Research, Southern Illinois University School of Medicine, Springfield, Illinois; and.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Bartke
authors.affiliation: Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, Michigan; Endocrinology Section, Medical Service, Veterans Affairs Medical Center, Ann Arbor, Michigan.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Bernal-Mizrachi
authors.affiliation: Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, Michigan;
authors.forename: Richard A
authors.initials: RA
authors.lastname: Miller
mesh_terms: D052436:Adipose Tissue, White / Q000033:anatomy & histology / Q000378:metabolism; D000375:Aging / Q000502:physiology; D000818:Animals; D049109:Cell Proliferation; D003441:Crowding / Q000523:psychology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D005951:Glucose Tolerance Test; D006706:Homeostasis / Q000502:physiology*; D007333:Insulin Resistance / Q000502:physiology*; D050417:Insulin-Secreting Cells / Q000502:physiology; D007515:Islets of Langerhans / Q000033:anatomy & histology / Q000502:physiology; D020738:Leptin / Q000502:physiology; D008297:Male; D051379:Mice; D009752:Nutritional Status; D012313:RNA / Q000096:biosynthesis / Q000302:isolation & purification; D060888:Real-Time Polymerase Chain Reaction; D013315:Stress, Psychological / Q000378:metabolism; D014886:Weaning
chemical_list: D020738:Leptin; D012313:RNA
keywords: caloric restriction; crowded litter; insulin; leptin; longevity
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