title: Aging is associated with an increase in T cells and inflammatory macrophages in visceral adipose tissue.
abstract: Age-related adiposity has been linked to chronic inflammatory diseases in late life. To date, the studies on adipose tissue leukocytes and aging have not taken into account the heterogeneity of adipose tissue macrophages (ATMs), nor have they examined how age impacts other leukocytes such as T cells in fat. Therefore, we have performed a detailed examination of ATM subtypes in young and old mice using state of the art techniques. Our results demonstrate qualitative changes in ATMs with aging that generate a decrease in resident type 2 (M2) ATMs. The profile of ATMs in old fat shifts toward a proinflammatory environment with increased numbers of CD206(-)CD11c(-) (double-negative) ATMs. The mechanism of this aging-induced shift in the phenotypic profile of ATMs was found to be related to a decrease in peroxisome proliferator-activated receptor-γ expression in ATMs and alterations in chemokine/chemokine receptor expression profiles. Furthermore, we have revealed a profound and unexpected expansion of adipose tissue T cells in visceral fat with aging that includes a significant induction of regulatory T cells in fat. Our findings demonstrate a unique inflammatory cell signature in the physiologic context of aging adipose tissue that differs from those induced in setting of diet-induced obesity.
authors.affiliation: Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Carey N
authors.initials: CN
authors.lastname: Lumeng
authors.forename: Jianhua
authors.initials: J
authors.lastname: Liu
authors.forename: Lynn
authors.initials: L
authors.lastname: Geletka
authors.forename: Colin
authors.initials: C
authors.lastname: Delaney
authors.forename: Jennifer
authors.initials: J
authors.lastname: Delproposto
authors.forename: Anjali
authors.initials: A
authors.lastname: Desai
authors.forename: Kelsie
authors.initials: K
authors.lastname: Oatmen
authors.forename: Gabriel
authors.initials: G
authors.lastname: Martinez-Santibanez
authors.forename: Annabelle
authors.initials: A
authors.lastname: Julius
authors.forename: Sanjay
authors.initials: S
authors.lastname: Garg
authors.forename: Raymond L
authors.initials: RL
authors.lastname: Yung
mesh_terms: D000375:Aging / Q000276:immunology* / Q000473:pathology*; D000818:Animals; D002469:Cell Separation / Q000379:methods; D016922:Cellular Senescence / Q000276:immunology*; D016130:Immunophenotyping; D007249:Inflammation / Q000276:immunology / Q000473:pathology; D050152:Intra-Abdominal Fat / Q000166:cytology / Q000276:immunology* / Q000473:pathology*; D007958:Leukocyte Count; D007963:Leukocytes, Mononuclear / Q000145:classification / Q000276:immunology* / Q000473:pathology; D018655:Lymphocyte Count; D017737:Macrophages, Peritoneal / Q000145:classification / Q000276:immunology / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000166:cytology / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000145:classification / Q000276:immunology / Q000473:pathology
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