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  • Title: Immunization of nonautoimmune mice with DNA binding domains of the largest subunit of RNA polymerase I results in production of anti-dsDNA and anti-Sm/RNP antibodies.
    Author: Sciascia SA, Robson K, Zhu L, Garland M, Grabosch S, Kelamis J, Messamore W, Bradley T, Sourk A, Westberg L, Goodnight W, Tongson K, Holloway N, Wardak Z, Sudyka M, Masrani S, Chintalapati S, Cagaanan M, Brown JC, Stetler DA.
    Journal: Autoimmunity; 2007 Feb; 40(1):38-47. PubMed ID: 17364496.
    Abstract:
    Antibodies against the N-terminal (NT) but not the basic domain (BD), DNA binding regions of the largest subunit (S1) of RNA polymerase I (RNAPI) were detected in the sera of MRL-lpr/lpr lupus mice. Antibodies against both RNAPI(S1)-NT and -BD, as well as other systemic lupus erythematosus (SLE) autoantigens (La, ribosomal P proteins and Sm/RNP) were produced by rabbits immunized with anti-DNA antibodies that had been affinity purified from SLE patients. Immunization of nonautoimmune mice (Balb/c) with RNAPI(S1)-NT, RNAPI(S1)-BD, or La in the form of GST fusion proteins, induced production of anti-double-stranded (ds) DNA and anti-Sm/RNP. GST-P1 did not induce an anti-dsDNA response in these mice. These results demonstrate that RNAPI(S1)-NT, RNAPI(S1)-BD and La can participate in an anti-autoantigen/anti-DNA antibody loop during an SLE-like autoimmune response.
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