title: Interleukin-6 contributes to age-related alteration of cytokine production by macrophages.
abstract: Here, we studied in vitro cytokine production by splenic macrophages obtained from young and aged BALB/c wild type (WT) and IL-6 knockout (IL-6 KO) mice. Relative to macrophages obtained from young WT mice given lipopolysaccharide (LPS), those from aged WT mice had decreased production of proinflammatory cytokines. In contrast, when compared to macrophages from young IL-6 KO mice, LPS stimulation yielded higher levels of these cytokines by cells from aged IL-6 KO mice. Aging or IL-6 deficiency did not affected the percentage of F4/80(+) macrophages, or the surface expression of Toll-like receptor 4 (TLR4) and components of the IL-6 receptor. Overall, our results indicate that IL-6 plays a role in regulating the age-related defects in macrophages through alteration of proinflammatory cytokines, adding to the complexity of IL-6-mediated impairment of immune cell function with increasing age.
authors.affiliation: Department of Surgery, and Immunology and Aging Program, The Burn and Shock Trauma Institute, Loyola University Medical Center, 2160 South First Avenue, Maywood, IL 60153, USA.
authors.forename: Christian R
authors.initials: CR
authors.lastname: Gomez
authors.forename: John
authors.initials: J
authors.lastname: Karavitis
authors.forename: Jessica L
authors.initials: JL
authors.lastname: Palmer
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Faunce
authors.forename: Luis
authors.initials: L
authors.lastname: Ramirez
authors.forename: Vanessa
authors.initials: V
authors.lastname: Nomellini
authors.forename: Elizabeth J
authors.initials: EJ
authors.lastname: Kovacs
mesh_terms: D000375:Aging / Q000502:physiology*; D000818:Animals; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism*; D005260:Female; D015850:Interleukin-6 / Q000235:genetics / Q000276:immunology*; D008070:Lipopolysaccharides / Q000276:immunology; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D013154:Spleen / Q000166:cytology; D051197:Toll-Like Receptor 4 / Q000276:immunology
chemical_list: D016207:Cytokines; D015850:Interleukin-6; D008070:Lipopolysaccharides; D051197:Toll-Like Receptor 4