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ANGIOTENSIN II IS A NEW COMPONENT INVOLVED IN SPLENIC T LYMPHOCYTE RESPONSES DURING PLASMODIUM BERGHEI ANKA INFECTION
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Resumen en ingles
The contribution of T cells in severe malaria pathogenesis has been described. Here, we provide evidence for the potential
role of angiotensin II (Ang II) in modulating splenic T cell responses in a rodent model of cerebral malaria. T cell activation
induced by infection, determined by 3 to 4-fold enhancement in CD69 expression, was reduced to control levels when mice
were treated with 20 mg/kg losartan (IC50 = 0.966 mg/kg/d), an AT1 receptor antagonist, or captopril (IC50 = 1.940 mg/kg/d),
an inhibitor of angiotensin-converting enzyme (ACE). Moreover, the production of interferon-c and interleukin-17 by CD4+ T
cells diminished 67% and 70%, respectively, by both treatments. Losartan reduced perforin expression in CD8+ T cells by
33% while captopril completely blocked it. The upregulation in chemokine receptor expression (CCR2 and CCR5) observed
during infection was abolished and CD11a expression was partially reduced when mice were treated with drugs. T cells
activated by Plasmodium berghei ANKA antigens showed 6-fold enhance in AT1 levels in comparison with naive cells. The
upregulation of AT1 expression was reduced by losartan (80%) but not by captopril. Our results suggest that the AT1/Ang II
axis has a role in the establishment of an efficient T cell response in the spleen and therefore could participate in a
misbalanced parasite-induced T cell immune response during P. berghei ANKA infection.
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