Long‐term caloric restriction ameliorates deleterious effects of aging on white and brown adipose tissue plasticity

• Published in: Aging cell Vol. 18; no. 3; pp. e12948 - n/a
• Main Authors: Corrales, Patricia, Vivas, Yurena, Izquierdo‐Lahuerta, Adriana, Horrillo, Daniel, Seoane‐Collazo, Patricia, Velasco, Ismael, Torres, Lucia, Lopez, Yamila, Martínez, Carmen, López, Miguel, Ros, Manuel, Obregon, Maria Jesus, Medina‐Gomez, Gema
• Format: Journal Article
• Language: English
• Published: England John Wiley & Sons, Inc 01-06-2019; John Wiley and Sons Inc
• Subjects: Adipose tissue; Adipose tissue (brown); Adipose Tissue, Brown - metabolism; Adipose Tissue, White - metabolism; Adipose tissues; Age; Aging; Aging - metabolism; Analysis; Animals; Body fat; Body weight loss; Caloric Restriction; Dietary restrictions; fibro‐inflammation; Food availability; Glucose Tolerance Test; Insulin; Insulin resistance; Male; Metabolism; Mice; Mice, 129 Strain; Original Paper; Original Papers; Plasticity; Positron Emission Tomography Computed Tomography; Risk factors; Thyroid; thyroid hormone; Weight loss; adipose tissue; caloric restriction; aging; thyroid hormone; fibro-inflammation; insulin resistance
• ISSN: 1474-9718; 1474-9726
• DOI: 10.1111/acel.12948

Age‐related increased adiposity is an important contributory factor in the development of insulin resistance (IR) and is associated with metabolic defects. Caloric restriction (CR) is known to induce weight loss and to decrease adiposity while preventing metabolic risk factors. Here, we show that moderate 20% CR delays early deleterious effects of aging on white and brown adipose tissue (WAT and BAT, respectively) function and improves peripheral IR. To elucidate the role of CR in delaying early signs of aging, young (3 months), middle‐aged (12 months), and old (20 months) mice fed al libitum and middle‐aged and old mice subjected to early‐onset CR were used. We show that impaired plasticity of subcutaneous WAT (scWAT) contributes to IR, which is already evident in middle‐aged mice. Moreover, alteration of thyroid axis status with age is an important factor contributing to BAT dysfunction in middle‐aged animals. Both defects in WAT and BAT/beige cells are ameliorated by CR. Accordingly, CR attenuated the age‐related decline in scWAT function and decreased the extent of fibro‐inflammation. Furthermore, CR promoted scWAT browning. In brief, our study identifies the contribution of scWAT impairment to age‐associated metabolic dysfunction and identifies browning in response to food restriction, as a potential therapeutic strategy to prevent the adverse metabolic effects in middle‐aged animals.
Impaired plasticity of subcutaneous white adipose tissue (scWAT) contributes to insulin resistance during aging, which is already evident in middle‐aged mice. Alteration of thyroid axis status with age is an important factor contributing to BAT dysfunction in middle‐aged animals. Defects in WAT and BAT/beige cells during aging are ameliorated by long‐term caloric restriction (CR).