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Comparison between autoantibodies arising during Trypanosoma cruzi infection in mice and natural autoantibodies.

T Ternynck, C Bleux, J Gregoire, S Avrameas and C Kanellopoulos-Langevin
J Immunol February 15, 1990, 144 (4) 1504-1511;
T Ternynck
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C Bleux
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J Gregoire
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S Avrameas
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C Kanellopoulos-Langevin
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Abstract

The autoantibodies induced in (C57BL/6 x BALB/c)F1 mice during Trypanosoma cruzi (CL strain) infection were analyzed and compared with natural autoantibodies present in healthy mice. Mice were killed at intervals after infection and their sera were tested by enzyme immunoassay against a panel of self- and non-self-Ag: actin, myoglobin, myosin, tubulin, DNA, and TNP-OVA. The level of IgM and IgG autoantibodies against all Ag started to increase from day 15 until 6 wk after the parasite infection. The high level of all autoantibodies persisted 3 mo postinfection, and 1 yr later, half of the mice still had elevated levels of IgM and IgG autoantibodies, particularly antitubulin IgG antibodies. IgM and IgG were isolated from pools of normal and infected mouse sera and their binding capacity to all Ag was compared. The titers of infected mouse sera were increased and the slopes of both IgM and IgG binding curves of autoantibodies to actin, myosin, and tubulin were greater than those of control mouse sera, indicating higher affinities. The average dissociation constant of the IgG2a autoantibody to mouse tubulin was 5 times lower than that of natural antitubulin IgG2a antibodies. Furthermore, absorption of the IgG from infected mouse sera onto a tubulin immunoadsorbent removed half the reactivity with tubulin and also with myosin, actin and parasite extracts. The eluted antibodies bound the same Ag. When IgG were further analyzed by Western blot on proteolytic fragments of tubulin, we found that antibodies from both groups bound to the same broad spectrum of polypeptide bands. However, additional fragments were recognized by antibodies from infected mice. All these results indicate that the autoantibodies naturally present in mice are significantly affected after infection with T. cruzi, in quantity as well as in specificity and affinity.

  • Copyright © 1990 by American Association of Immunologists

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The Journal of Immunology
Vol. 144, Issue 4
15 Feb 1990
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Comparison between autoantibodies arising during Trypanosoma cruzi infection in mice and natural autoantibodies.
T Ternynck, C Bleux, J Gregoire, S Avrameas, C Kanellopoulos-Langevin
The Journal of Immunology February 15, 1990, 144 (4) 1504-1511;

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Comparison between autoantibodies arising during Trypanosoma cruzi infection in mice and natural autoantibodies.
T Ternynck, C Bleux, J Gregoire, S Avrameas, C Kanellopoulos-Langevin
The Journal of Immunology February 15, 1990, 144 (4) 1504-1511;
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Print ISSN 0022-1767        Online ISSN 1550-6606