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Revista do Instituto de Medicina Tropical de São Paulo

On-line version ISSN 1678-9946


PEREIRA, Francielle Beltrão et al. Vasoactive intestinal peptide degradation might influence Interleukin-17 expression in cardiac chagasic patients. Rev. Inst. Med. trop. S. Paulo [online]. 2018, vol.60, e57.  Epub Oct 22, 2018. ISSN 1678-9946.

The vasoactive intestinal peptide (VIP) expression is lower in cardiac chagasic patients and is related to worse cardiac function. The reduction of VIP in patients with Chagas disease may be a result of its enhanced degradation. To test this hypothesis, the tryptase and chymase expression was evaluated. We also related VIP levels with interleukin-17 (IL-17) expression since VIP may modulate IL-17 production. Plasma levels of chymase were higher in chagasic patients. Conversely, VIP/chymase and VIP/tryptase ratios were lower in chagasic patients when compared to non-infected individuals. Besides, the VIP/chymase ratio was lower in chagasic cardiac patients in comparison with the indeterminate group. A positive correlation between tryptase and chymase levels was observed in chagasic cardiac patients. In relation to IL-17, we observed a higher expression of this cytokine in the cardiac form of the disease than in the indeterminate form. IL-17/VIP ratio was higher in the cardiac form in comparison with non-infected or indeterminate form. These results suggest that the low levels of VIP observed in chagasic patients could be due to an increased production of chymase and/or to the additive effect of the interaction between chymase and tryptase in the cardiac form. Moreover, the decreased VIP expression may contribute to the increase of IL-17 in chagasic cardiac patients.

Keywords : Chagas disease; Tryptase; Chymase; Vasoactive intestinal peptide (VIP); Interleukin-17; IL-17.

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