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2018 ; 9
(ä): 1418
Nephropedia Template TP
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English Wikipedia
Pivotal Role of IL-22 Binding Protein in the Epithelial Autoregulation of
Interleukin-22 Signaling in the Control of Skin Inflammation
#MMPMID29977242
Fukaya T
; Fukui T
; Uto T
; Takagi H
; Nasu J
; Miyanaga N
; Arimura K
; Nakamura T
; Koseki H
; Choijookhuu N
; Hishikawa Y
; Sato K
Front Immunol
2018[]; 9
(ä): 1418
PMID29977242
show ga
Disruption of skin homeostasis can lead to inflammatory cutaneous diseases
resulting from the dysregulated interplay between epithelial keratinocytes and
immune cells. Interleukin (IL)-22 signaling through membrane-bound IL-22 receptor
1 (IL-22R1) is crucial to maintain cutaneous epithelial integrity, and its
malfunction mediates deleterious skin inflammation. While IL-22 binding protein
(IL-22BP) binds IL-22 to suppress IL-22 signaling, how IL-22BP controls
epithelial functionality to prevent skin inflammation remains unclear. Here, we
describe the pivotal role of IL-22BP in mediating epithelial autoregulation of
IL-22 signaling for the control of cutaneous pathogenesis. Unlike prominent
expression of IL-22BP in dendritic cells in lymphoid tissues, epidermal
keratinocytes predominantly expressed IL-22BP in the skin in the steady state,
whereas its expression decreased during the development of psoriatic
inflammation. Deficiency in IL-22BP aggravates psoriasiform dermatitis,
accompanied by abnormal hyperproliferation of keratinocytes and excessive
cutaneous inflammation as well as enhanced dermal infiltration of granulocytes
and ??T cells. Furthermore, IL-22BP abrogates the functional alternations of
keratinocytes upon stimulation with IL-22. On the other hand, treatment with
IL-22BP alleviates the severity of cutaneous pathology and inflammation in
psoriatic mice. Thus, the fine-tuning of IL-22 signaling through autocrine
IL-22BP production in keratinocytes is instrumental in the maintenance of skin
homeostasis.