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2015 ; 5
(ä): 14871
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FSP1(+) fibroblast subpopulation is essential for the maintenance and
regeneration of medullary thymic epithelial cells
#MMPMID26445893
Sun L
; Sun C
; Liang Z
; Li H
; Chen L
; Luo H
; Zhang H
; Ding P
; Sun X
; Qin Z
; Zhao Y
Sci Rep
2015[Oct]; 5
(ä): 14871
PMID26445893
show ga
Thymic epithelial cells (TECs) form a 3-dimentional network supporting thymocyte
development and maturation. Besides epithelium and thymocytes, heterogeneous
fibroblasts are essential components in maintaining thymic microenvironments.
However, thymic fibroblast characteristics, development and function remain to be
determined. We herein found that thymic non-hematopoietic CD45(-)FSP1(+) cells
represent a unique Fibroblast specific protein 1 (FSP1)(-)fibroblast-derived cell
subset. Deletion of these cells in FSP1-TK transgenic mice caused thymus atrophy
due to the loss of TECs, especially mature medullary TECs (MHCII(high), CD80(+)
and Aire(+)). In a cyclophosphamide-induced thymus injury and regeneration model,
lack of non-hematopoietic CD45(-)FSP1(+) fibroblast subpopulation significantly
delayed thymus regeneration. In fact, thymic FSP1(+) fibroblasts released more
IL-6, FGF7 and FSP1 in the culture medium than their FSP1(-) counterparts.
Further experiments showed that the FSP1 protein could directly enhance the
proliferation and maturation of TECs in the in vitro culture systems. FSP1
knockout mice had significantly smaller thymus size and less TECs than their
control. Collectively, our studies reveal that thymic CD45(-)FSP1(+) cells are a
subpopulation of fibroblasts, which is crucial for the maintenance and
regeneration of TECs especially medullary TECs through providing IL-6, FGF7 and
FSP1.