Interaction between bradykinin B2 and Ang-(1–7) Mas receptors regulates erythrocyte invasion by Plasmodium falciparum

• Published in: Biochimica et biophysica acta Vol. 1860; no. 11; pp. 2438 - 2444
• Main Authors: Silva, Leandro de Souza, Peruchetti, Diogo de Barros, Silva, Claudio Teixeira Ferreira-Da, Ferreira-DaSilva, André Teixeira, Perales, Jonas, Caruso-Neves, Celso, Pinheiro, Ana Acacia Sá
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.11.2016
• Subjects: Angiotensin-(1–7); angiotensin-converting enzyme inhibitors; antagonists; Bradykinin; cAMP-dependent protein kinase; Cells, Cultured; erythrocytes; Erythrocytes - parasitology; Exchange protein activated by cAMP; Host-parasite interaction; Humans; Malaria; parasites; peptidyl-dipeptidase A; Plasmodium falciparum; Plasmodium falciparum - metabolism; Plasmodium falciparum - pathogenicity; precipitin tests; Protein Binding; Proto-Oncogene Proteins - metabolism; Protozoan Proteins - metabolism; Receptor, Bradykinin B2 - metabolism; receptors; Receptors, G-Protein-Coupled - metabolism; renin-angiotensin system; KKS; Host-parasite interaction; ACE; Angiotensin-(1–7); Malaria; RAS; Bradykinin; PKA; BK; Epac; iPKA; Exchange protein activated by cAMP
• ISSN: 0304-4165; 0006-3002; 1872-8006
• DOI: 10.1016/j.bbagen.2016.07.011

The molecular mechanisms involved in erythrocyte invasion by malaria parasite are well understood, but the contribution of host components is not. We recently reported that Ang-(1–7) impairs the erythrocytic cycle of P. falciparum through Mas receptor-mediated reduction of protein kinase A (PKA) activity. The effects of bradykinin (BK), a peptide of the kallikrein-kinin system (KKS), can be potentiated by Ang-(1–7), or angiotensin-converting enzyme (ACE) inhibitors, such as captopril. We investigated the coordinated action between renin-angiotensin system (RAS) and KKS peptides in the erythrocyte invasion by P. falciparum. We used human erythrocytes infected with P. falciparum to assess the influence of RAS and KKS peptides in the invasion of new erythrocytes. The inhibitory effects of Ang-(1–7) were mimicked by captopril. 10−8M BK decreased new ring forms and this effect was sensitive to 10−8M HOE-140 and 10−7M A779, B2 and Mas receptor antagonists, respectively. However, DALBK, a B1 receptor blocker, had no effect. The inhibitory effect of Ang-(1–7) was reversed by HOE-140 and A779 at the same concentrations. Co-immunoprecipitation assay revealed an association between B2 and Mas receptors. BK also inhibited PKA activity, which was sensitive to both HOE-140 and A779. The results suggest that B2 and Mas receptors are mediators of Ang-(1–7) and BK inhibitory effects, through a cross-signaling pathway, possibly by the formation of a heterodimer. Our results describe new elements in host signaling that could be involved in parasite invasion during the erythrocyte cycle of P. falciparum. •BK mimics Ang-(1-7) effect in reducing erythrocyte invasion by P. falciparum•BK reduces erythrocyte invasion by P. falciparum by inhibiting PKA activity.•Mas and B2 receptors are associated in the erythrocyte membrane.•Parasite EPAC blocks the inhibitory effect of Ang-(1-7)/BK on erythrocyte invasion.