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Rheumatology (Oxford). 2003 Jan;42(1):154-61.

Autoantibodies to dsDNA cross-react with the arginine-glycine-rich domain of heterogeneous nuclear ribonucleoprotein A2 (hnRNP A2) and promote methylation of hnRNP A2.

Author information

1
Faculty of Medical Technology and Institute of Biotechnology in Medicine, National Yang-Ming University, 155 Section 2, Lie-Nong Street, Shih-Pai, Taipei, Taiwan 112, ROC. ksun@ym.edu.tw

Abstract

OBJECTIVE:

This study was designed to clarify the internalization of anti-DNA antibodies (anti-DNA) into living cells in the pathogenesis of systemic lupus erythematosus (SLE) using anti-DNA monoclonal antibodies (mAbs).

METHODS:

Anti-DNA mAbs 9D7, 9D7D2, 9A4, 5E3F5, 12B3H2 and 6E11E3 were prepared by a standard hybridoma procedure to determine the interaction of anti-DNA with proteins in different types of cells.

RESULTS:

The anti-DNA mAbs reacted with two protein antigens (35 and 50 kDa) in the cells. The 35-kDa antigen was shown to have 100% homology with hnRNP A2. The arginine-glycine-rich domain in hnRNP A2 was found to be the reaction site, and the methylation of hnRNP A2 by PRMT1 (protein arginine methyltransferase 1) was increased by anti-DNA. Moreover, anti-DNA was demonstrated to bind and internalize into the cytoplasm and nucleus.

CONCLUSION:

Nuclear localizing anti-DNA may cross-react with hnRNP A2 to modulate the inflammatory responses and polarize immune reactions associated with SLE.

PMID:
12509629
DOI:
10.1093/rheumatology/keg060
[Indexed for MEDLINE]

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