Natural autoantibodies, IgG antibodies to tetanus toxoid and CD5+ B cells in patients with Mediterranean visceral leishmaniasis. The Leishmania Study Group.

Hechmi Louzir 1 L. Belal-Kacemi 1 A. Sassi 2 D. Laouini 2 R. Ben Ismail 3 K. Dellagi 1, 2
1 Laboratoire d'Immunologie, Institut Pasteur de Tunis
2 Laboratoire d'hématologie
3 Laboratoire d'Epidémiologie et d'Ecologie parasitaire, Institut Pasteur de Tunis
Abstract : Natural autoantibodies (NaAb) and IgG antibodies to tetanus toxoid (TT) were analysed in the sera of 38 children with active visceral leishmaniasis (VL) previously vaccinated with TT and in 30 healthy controls matched for sex and age. Patients exhibited high levels of NaAb to a panel of self antigens (tubulin, myosin, myoglobin, actin) contrasting to a low level of IgG to TT. Analysis of the circulating B cells in 26 untreated patients showed a low percentage of CD5+ per total B cells (3-66%, mean 36.6%) compared with 14 normal controls (17.8-66.6%, mean 52.7%) (P < 0.001). Evaluation of these parameters after antimonial therapy showed a significant decrease of the level of the NaAb (P < 0.0005), and a spontaneous increase of the level of the IgG to TT without any vaccine boosting (P < 0.01). In contrast, there was a significant increase in CD5+ B cells (P < 0.0005). This result suggests that CD5+ B cells may be sequestrated in parasitized lymphoid organs and may be released after remission. These findings show that the polyclonal B cell activation that occurs during active VL involves mainly B cells bearing NaAb and are in favour of a functional dichotomy of B cells.
Keywords : natural antibodies B cell population anti-tetanus toxoid antibodies visceral leishmaniasis
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Journal articles
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Submitted on : Thursday, February 28, 2019 - 1:11:02 PM
Last modification on : Wednesday, May 15, 2019 - 11:10:17 AM

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Hechmi Louzir, L. Belal-Kacemi, A. Sassi, D. Laouini, R. Ben Ismail, et al.. Natural autoantibodies, IgG antibodies to tetanus toxoid and CD5+ B cells in patients with Mediterranean visceral leishmaniasis. The Leishmania Study Group.. Clinical and Experimental Immunology, Wiley, 1994, 95 (3), pp.479-84. ⟨10.1111/j.1365-2249.1994.tb07022.x⟩. ⟨pasteur-02052234⟩

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