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2018 ; 17
(4
): 5116-5124
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Hypoxia?induced autophagy is inhibited by PADI4 knockdown, which promotes
apoptosis of fibroblast?like synoviocytes in rheumatoid arthritis
#MMPMID29393388
Fan T
; Zhang C
; Zong M
; Fan L
Mol Med Rep
2018[Apr]; 17
(4
): 5116-5124
PMID29393388
show ga
Impaired apoptosis of rheumatoid arthritis (RA)?fibroblast?like synoviocytes
(FLS) is pivotal in the process of RA. Peptidyl arginine deiminase type IV
(PADI4) is associated with autoantibody regulation via histone citrullination in
RA. The present study aimed to investigate the role of PADI4 in the apoptosis of
RA?FLS. FLS were isolated from patients with RA and a rat model. The effects of
PADI4 on RA?FLS were investigated in vitro and in vivo. Hypoxia?induced autophagy
was induced by 1% O2 and was detected by immunohistochemical and
immunofluorescence analysis; in addition, apoptosis was detected by flow
cytometry. RA?FLS obtained from RA rat model exhibited significant proliferation
under severe hypoxia conditions. Hypoxia also significantly induced autophagy and
elevated the expression of PADI4. Subsequently, short hairpin RNA?mediated PADI4
knockdown was demonstrated to significantly inhibit hypoxia?induced autophagy and
promote apoptosis in RA?FLS. The results of these in vitro and in vivo studies
suggested that PADI4 may be closely associated with hypoxia?induced autophagy,
and the inhibition of hypoxia?induced autophagy by PADI4 knockdown may contribute
to an increase in the apoptosis of RA?FLS.