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2018 ; 20
(1
): 157
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Effects of CTLA4-Ig treatment on circulating fibrocytes and skin fibroblasts from
the same systemic sclerosis patients: an in vitro assay
#MMPMID30053831
Cutolo M
; Soldano S
; Montagna P
; Trombetta AC
; Contini P
; Ruaro B
; Sulli A
; Scabini S
; Stratta E
; Paolino S
; Pizzorni C
; Smith V
; Brizzolara R
Arthritis Res Ther
2018[Jul]; 20
(1
): 157
PMID30053831
show ga
BACKGROUND: Systemic sclerosis (SSc) is characterized by vasculopathy and
progressive fibrosis. CTLA4-Ig (abatacept) is able to interact with the cell
surface costimulatory molecule CD86 and downregulate the target cell. The aim of
this study was to evaluate the in-vitro effects of CTLA4-Ig treatment on
circulating fibrocytes and skin fibroblasts isolated from the same SSc patient.
METHODS: Circulating fibrocytes and skin fibroblasts were obtained from eight SSc
patients with "limited" cutaneous involvement and from four healthy subjects
(HSs). Samples were analyzed by fluorescence-activated cell sorter analysis
(FACS) at baseline (T0) and after 8 days of culture (T8) for CD45, collagen type
I (COL I), CXCR4, CD14, CD86, and HLA-DRII expression. Circulating fibrocytes
were treated for 3 h and skin fibroblasts for 24/48 h with CTLA4-Ig (10, 50, 100,
500 ?g/ml). Quantitative real-time polymerase chain reaction (qRT-PCR) was
performed for CD86, COL I, FN, TGF?, ?SMA, S100A4, CXCR2, CXCR4, CD11a, and
Western blotting was performed for COL I and FN. RESULTS: Using qRT-PCR, the
T8-cultured SSc circulating fibrocytes which had not been treated with CTLA4-Ig
showed higher gene expression for CD86, ?SMA, S100A4, TGF?, and COL I compared
with HS circulating fibrocytes. Interestingly, ?SMA/COL I gene expression was
significantly lower only in the SSc circulating fibrocytes treated with CTLA4-Ig
for 3 h (p 0.01, p 0.05). On the contrary, no effects were observed for
either SSc or HS skin fibroblasts after CTLA4-Ig treatment. COL I and FN protein
expression was unchanged in both SSc and HS skin fibroblasts by Western blot.
CONCLUSIONS: Circulating fibrocytes seem to be more responsive to CTLA4-Ig
treatment than skin fibroblasts from the same SSc patient, likely due to their
higher expression of CD86. CTLA4-Ig treatment might downregulate the fibrotic
process in SSc patients by downregulating the fibrocytes, circulating progenitor
cells.