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2017 ; 137
(5
): 1042-1050
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Skin-Resident Effector Memory CD8(+)CD28(-) T Cells Exhibit a Profibrotic
Phenotype in Patients with Systemic Sclerosis
#MMPMID28012718
Li G
; Larregina AT
; Domsic RT
; Stolz DB
; Medsger TA Jr
; Lafyatis R
; Fuschiotti P
J Invest Dermatol
2017[May]; 137
(5
): 1042-1050
PMID28012718
show ga
Loss of CD28 expression by CD8(+) T cells occurs with age and during chronic
inflammatory conditions. CD8(+)CD28(-) T cells are a heterogeneous cell
subpopulation whose function ranges from immunosuppressive to effector. Here we
analyzed the role of CD8(+)CD28(-) T cells in the pathogenesis of systemic
sclerosis (SSc), a connective tissue disorder characterized by autoimmunity,
vasculopathy, and extensive cutaneous and visceral fibrosis. We show that the
frequency of CD8(+)CD28(-) T cells is increased in the blood and affected skin of
SSc patients, independent of patient age, and correlates with the extent of skin
fibrosis. We found that most skin-tropic CD8(+)CD28(-) T cells are resident in
the skin lesions of patients in the early stage of the disease, exhibit an
effector memory phenotype, and present a strong cytolytic activity ex vivo.
Skin-resident and circulating SSc CD8(+)CD28(-) T cells produce high levels of
the profibrotic cytokine IL-13, which induces collagen production by normal and
SSc dermal fibroblasts. Thus, our findings indicate that CD8(+)CD28(-) T cells
represent a pathogenic T-cell subset in SSc and likely play a critical role in
the early stage of SSc skin disease.