Upregulation of citrullination pathway: From Autoimmune to Idiopathic Lung Fibrosis

Respiratory Research
Katerina D SamaraKaterina M Antoniou

Abstract

Increased protein citrullination and peptidylarginine deiminases (PADIs), which catalyze the citrullination process, are central in Rheumatoid arthritis pathogenesis and probably involved in the initial steps towards autoimmunity. Approximately, 10% of RA patients develop clinically significantly ILD. A possible shared role of protein citrullination in rheumatoid arthritis associated interstitial lung disease (RA-ILD), and idiopathic pulmonary fibrosis (IPF) pathogenesis remains unclear. We evaluated PADI2 and PADI4 mRNA expression in bronchoalveolar lavage fluid (BALF) cells of 59 patients with IPF, 27 patients RA-ILD and 10 healthy controls. PADI 2 and 4 expression was analyzed by western blot and immunohistochemistry. Citrullinated protein levels were also quantified. PADI4 mRNA and protein levels were higher in RA-ILD and IPF than controls. Furthermore, PADI4 mRNA levels showed an increase among smokers in RA-ILD. PADI4 expression was detected in granulocytes and macrophages in all groups, with the strongest cytoplasmic expression observed in granulocytes in RA-ILD and IPF. PADI2 mRNA and immunostaining of BAL cells, were similar in all groups among smokers. Overall, stronger staining was observed in current smokers. Citrul...Continue Reading

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Citations

Dec 27, 2019·Immunological Reviews·Justyna Fert-BoberFelipe Andrade
Feb 23, 2020·International Journal of Molecular Sciences·Miguel Beato, Priyanka Sharma
Mar 27, 2019·International Journal of Molecular Sciences·Tomonari Kinoshita, Taichiro Goto
Sep 12, 2020·American Journal of Respiratory Cell and Molecular Biology·Masaki SuzukiKoichiro Tatsumi
Mar 19, 2021·Science Translational Medicine·Fu Jun LiVeena B Antony
Jun 15, 2021·Experimental Eye Research·Janice L Walker, A Sue Menko

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Methods Mentioned

BETA
bronchoalveolar
electrophoresis
chemical modification

Software Mentioned

Image Lab
BioRad

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