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2015 ; 7
(279
): 279ra39
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Human skin is protected by four functionally and phenotypically discrete
populations of resident and recirculating memory T cells
#MMPMID25787765
Watanabe R
; Gehad A
; Yang C
; Scott LL
; Teague JE
; Schlapbach C
; Elco CP
; Huang V
; Matos TR
; Kupper TS
; Clark RA
Sci Transl Med
2015[Mar]; 7
(279
): 279ra39
PMID25787765
show ga
The skin of an adult human contains about 20 billion memory T cells. Epithelial
barrier tissues are infiltrated by a combination of resident and recirculating T
cells in mice, but the relative proportions and functional activities of resident
versus recirculating T cells have not been evaluated in human skin. We
discriminated resident from recirculating T cells in human-engrafted mice and
lymphoma patients using alemtuzumab, a medication that depletes recirculating T
cells from skin, and then analyzed these T cell populations in healthy human
skin. All nonrecirculating resident memory T cells (TRM) expressed CD69, but most
were CD4(+), CD103(-), and located in the dermis, in contrast to studies in mice.
Both CD4(+) and CD8(+) CD103(+) TRM were enriched in the epidermis, had potent
effector functions, and had a limited proliferative capacity compared to CD103(-)
TRM. TRM of both types had more potent effector functions than recirculating T
cells. We observed two distinct populations of recirculating T cells,
CCR7(+)/L-selectin(+) central memory T cells (TCM) and CCR7(+)/L-selectin(-) T
cells, which we term migratory memory T cells (TMM). Circulating skin-tropic TMM
were intermediate in cytokine production between TCM and effector memory T cells.
In patients with cutaneous T cell lymphoma, malignant TCM and TMM induced
distinct inflammatory skin lesions, and TMM were depleted more slowly from skin
after alemtuzumab, suggesting that TMM may recirculate more slowly. In summary,
human skin is protected by four functionally distinct populations of T cells, two
resident and two recirculating, with differing territories of migration and
distinct functional activities.
|Alemtuzumab
[MESH]
|Animals
[MESH]
|Antibodies, Monoclonal, Humanized/*therapeutic use
[MESH]