MEM INST OSWALDO CRUZ, RIO DE JANEIRO, Vol. 113 | 2018
PAGES: DOI: 10.1590/0074-02760170425 Short communication
Lutzomyia umbratilis from an area south of the Negro River is refractory to in vitro interaction with Leishmania guyanensis

Rodrigo Pedro Soares1, Paula Monalisa Nogueira1, Nágila Francinete Secundino1, Eric Fabrício Marialva2, Cláudia Maria Ríos-Velásquez2, Felipe Arley Costa Pessoa2,+

1Fundação Oswaldo Cruz-Fiocruz, Instituto René Rachou, Belo Horizonte, MG, Brasil
2Fundação Oswaldo Cruz-Fiocruz, Instituto Leônidas e Maria Deane, Manaus, AM, Brasil

Abstract

BACKGROUND Lutzomyia umbratilis, the vector for Leishmania guyanensis in northern South America, has been found naturally infected with L. guyanensis only in areas north of the Negro and Amazon rivers. While populations of this sand fly species are also found in areas south of these rivers, these populations have never been reported to be infected and/or transmitting L. guyanensis. However, no studies on the corresponding host-parasite interactions are available.

OBJECTIVES This study evaluated the interaction between Lu. guyanensis promastigotes and field-collected Lu. umbratilis sand flies from Rio Preto da Eva and Manacapuru, which are located to the north and south, respectively, of the Negro River.

METHODS Procyclic and metacyclic attachment was quantified using an in vitro system.

FINDINGS Low attachment of parasites to the midguts of insects collected from Manacapuru was detected. Conversely, greater binding of metacyclic parasites was observed in the midguts of insects collected from Rio Preto da Eva, and this attachment was more pronounced than that observed for procyclics (p < 0.03).

MAIN CONCLUSIONS The Lu. umbratilis population from an area south of the Negro River has lower in vitro interaction with L. guyanensis. The higher attachment of L. guyanensis to midguts of insects from Rio Preto da Eva may suggest better vector competence. These findings are in accordance with previously reported epidemiological information of American cutaneous leishmaniasis (ACL) transmission in the Amazon.

+ Corresponding author: This e-mail address is being protected from spambots. You need JavaScript enabled to view it.
Received 08 October 2017
Accepted 28 November 2017

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