title: Age-associated skin changes in innate immunity markers reflect a complex interaction between aging mechanisms in the sebaceous gland.
abstract: Skin aging is the most apparent form of senescence and could reflect the aging of inner organs. Molecular changes involved in innate immunity signaling, tumorigenesis, and inflammation were studied. Protein levels were evaluated based on the immunohistochemistry of the skin of 42 young and old individuals. The investigated molecules (peroxisome proliferator-activated receptors-α and -γ, Toll-like receptor 4, and interleukin-6 and 8) were expressed in almost all skin compartments and exhibited significant aging-associated downregulation in epithelial tissues, mostly in the sebaceous glands, the sweat glands, and the epidermis. With the exception of interleukin-6 in the dermal tissue, no upregulation was detected in the aged group. The results obtained indicate an interesting interaction between different pathways of aging, namely defective stress responses, downregulated innate immunity responses, and activation of the tumorigenesis pathway, which was especially apparent in the sebaceous glands.
authors.affiliation: Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Dessau, Germany; Departments of Dermatology, Venereology and Andrology, Ain Shams University, Faculty of Medicine, Cairo, Egypt.
authors.forename: Rana M
authors.initials: RM
authors.lastname: Elewa
authors.forename: Marwa A
authors.initials: MA
authors.lastname: Abdallah
authors.forename: Christos C
authors.initials: CC
authors.lastname: Zouboulis
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015536:Down-Regulation; D005260:Female; D006801:Humans; D007113:Immunity, Innate; D015850:Interleukin-6 / Q000032:analysis; D016209:Interleukin-8 / Q000032:analysis; D008297:Male; D008875:Middle Aged; D047493:PPAR alpha / Q000032:analysis; D047495:PPAR gamma / Q000032:analysis; D012627:Sebaceous Glands / Q000737:chemistry / Q000276:immunology*; D012867:Skin / Q000737:chemistry*; D015595:Skin Aging / Q000276:immunology*; D051197:Toll-Like Receptor 4 / Q000032:analysis; D055815:Young Adult
chemical_list: D015850:Interleukin-6; D016209:Interleukin-8; D047493:PPAR alpha; D047495:PPAR gamma; D051197:Toll-Like Receptor 4
keywords: innate immunity; sebaceous glands; skin aging; tumorigenesis