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Briscoe, H. et al.

Briscoe, Roach, Meadows, Rathjen, Britton,

A novel tumor necrosis factor (TNF) mimetic peptide prevents recrudescence of Mycobacterium bovis bacillus Calmette-Guerin (BCG) infection in CD4+ T cell-depleted mice.

Tumor necrosis factor (TNF) is required to control mycobacterial infections, but its therapeutic value is limited by its in vivo instability and toxicity. The efficacy of a nontoxic TNF-mimetic peptide (TNF70-80) was tested in mice infected with Mycobacterium bovis bacillus Callette-Guerin (BCG). In vitro TNF70-80 and recombinant human TNF (hTNF) acted with interferon gamma ( IFN-gamma) to reduce bacterial replication and to induce synthesis of bactericidal nitric oxide (NO) in BCG-infected, bone marrow-derived murine macrophages. The dose-dependent inhibitory effect on bacterial replication was blocked by neutralizing anti- IFN-gamma and anti-hTNF mAbs. Further, n-monomethyl-L-arginine (n-MMA) and a soluble TNF-receptor I (TNFRI-IgG) blocked bacterial growth and NO synthesis. Therefore, the peptide acted with IFN-gamma via induction of NO synthase and signaled through TNFRI receptors. Concomitant in vivo treatment with TNF70-80 or hTNF prevented reactivation of chronic BCG infection in mice depleted of CD4+ T cells by injecting anti-CD4 antibodies. Granuloma number and bacterial load were comparable in treated, T cell-depleted mice and in chronically infected, intact animals. Thus, TNF70-80 and hTNF can modulate recrudescent BCG infection in CD4+ T cell-deficient mice.[1]

References

A novel tumor necrosis factor (TNF) mimetic peptide prevents recrudescence of Mycobacterium bovis bacillus Calmette-Guerin (BCG) infection in CD4+ T cell-depleted mice. Briscoe, H., Roach, D.R., Meadows, N., Rathjen, D., Britton, W.J. J. Leukoc. Biol. (2000) [Pubmed]

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