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Immunological Aspects of Skin Aging in Atopic Dermatitis

期刊

出版社

MDPI
DOI: 10.3390/ijms22115729

关键词

skin aging; atopic dermatitis (AD); skin immune responses

资金

  1. NIH [1R01AR073004-01A1, R01AR071189-01A1, R21 AI149267-01A1]
  2. VA merit grant [1I01BX004293-01A1]

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The aging skin undergoes immunosenescence and immunological alterations, which together with environmental stressors and genetic factors can lead to immune dysregulation and epidermal barrier abnormalities, facilitating the late onset of atopic dermatitis (AD) in the elderly. While healthy aged skin shows overproduction of cytokines, older AD patients have decreased levels of Th2/Th22 related cytokines and increased expression of terminal differentiation markers, reflecting the persistence of AD in an aged skin environment.
The cutaneous immune response is important for the regulation of skin aging well as for the development of immune-mediated skin diseases. Aging of the human skin undergoes immunosenescence with immunological alterations and can be affected by environmental stressors and internal factors, thus leading to various epidermal barrier abnormalities. The dysfunctional epidermal barrier, immune dysregulation, and skin dysbiosis in the advanced age, together with the genetic factors, facilitate the late onset of atopic dermatitis (AD) in the elderly, whose cases have recently been on the rise. Controversial to the healthy aged skin, where overproduction of many cytokines is found, the levels of Th2/Th22 related cytokines inversely correlated with age in the skin of older AD patients. As opposed to an endogenously aged skin, the expression of the terminal differentiation markers significantly increases with age in AD. Despite the atenuated barrier disturbances in older AD patients, the aged skin carries an impairment associated with the aging process, which reflects the persistence of AD. The chronicity of AD in older patients might not directly affect skin aging but does not allow spontaneous remission. Thus, adult- and elderly subtypes of AD are considered as a lifelong disease.

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