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2016 ; 113
(20
): E2842-51
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Thy1+IL-7+ lymphatic endothelial cells in iBALT provide a survival niche for
memory T-helper cells in allergic airway inflammation
#MMPMID27140620
Shinoda K
; Hirahara K
; Iinuma T
; Ichikawa T
; Suzuki AS
; Sugaya K
; Tumes DJ
; Yamamoto H
; Hara T
; Tani-Ichi S
; Ikuta K
; Okamoto Y
; Nakayama T
Proc Natl Acad Sci U S A
2016[May]; 113
(20
): E2842-51
PMID27140620
show ga
Memory CD4(+) T helper (Th) cells are central to long-term protection against
pathogens, but they can also be pathogenic and drive chronic inflammatory
disorders. How these pathogenic memory Th cells are maintained, particularly at
sites of local inflammation, remains unclear. We found that ectopic lymphoid-like
structures called inducible bronchus-associated lymphoid tissue (iBALT) are
formed during chronic allergic inflammation in the lung, and that memory-type
pathogenic Th2 (Tpath2) cells capable of driving allergic inflammation are
maintained within the iBALT structures. The maintenance of memory Th2 cells
within iBALT is supported by Thy1(+)IL-7-producing lymphatic endothelial cells
(LECs). The Thy1(+)IL-7-producing LECs express IL-33 and T-cell-attracting
chemokines CCL21 and CCL19. Moreover, ectopic lymphoid structures consisting of
memory CD4(+) T cells and IL-7(+)IL-33(+) LECs were found in nasal polyps of
patients with eosinophilic chronic rhinosinusitis. Thus, Thy1(+)IL-7-producing
LECs control chronic allergic airway inflammation by providing a survival niche
for memory-type Tpath2 cells.