Comparison of natural antibodies to autoantibodies arising during lupus in (NZB x NZW)F1 mice - PubMed (original) (raw)
Comparative Study
Comparison of natural antibodies to autoantibodies arising during lupus in (NZB x NZW)F1 mice
B Hentati et al. J Autoimmun. 1991 Apr.
Abstract
Autoantibodies arising in (NZB x NZW)F1 (B/W) mice during the lupus-like syndrome were studied and compared to natural antibodies present in normal mice. The antibody activities were tested in sera, circulating immune complexes (CIC) and kidney eluates, using an enzyme immunoassay against a panel of self and non-self antigens: actin, myosin, tubulin, DNA, myoglobin, spectrin and trinitrophenylated bovine serum albumin (TNP/BSA). In the B/M mouse sera, IgM antibodies reacting with all the panel of antigens (PAg) and comparable to those of normal mice, increased moderately from 5 to 9 months and markedly during the last stage preceding death (10 months), when particularly high levels of anti-DNA, anti-tubulin and anti-myoglobin antibodies were noted. Polyreactive IgM antibodies present in CIC were moderately increased while those present in complexes deposited in kidneys were strongly enhanced after the 8th month. IgG antibodies showed an early increase (2 months) in B/W sera for anti-TNP activity, which remained more or less constant until death, while a later (5-6 months) and greater increase of activity, mainly directed against DNA but also against the other antigens of the panel, was observed. In CIC, IgG, mainly anti-DNA but also anti-TNP, were enhanced at the end of the disease while at the same time IgG reacting with all the PAg were found in kidney deposits. Isolation of antibodies from sera on a DNA-immunoadsorbent demonstrated that eluted IgM reacted with all the PAg but mainly with DNA, while IgG reactivity was more restricted to DNA and to a lesser degree to TNP. The D23 idiotype, characteristics of natural polyspecific antibodies, was expressed on IgM and IgG autoantibodies from B/W mice and was enhanced, particularly in kidneys, at the end of the disease. These results demonstrate that natural antibodies are a part of the population of increased autoantibodies in this disease and could participate with IgG anti-DNA antibodies in lupus.
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