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      Presencia de nectomonadas metaciclicas de L. pifanoi en la hipofaringe de Lutzomyia youngi y la ingestion de azúcares Translated title: Metacyclical forms of L. pifanoi in the hypopharynx of Lutzomyia youngi and their sugar consumption

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          Abstract

          Se evidencia la presencia de promastigotos metacíclicos de Leishmania pifanoi en el conducto hipofaríngeo de Lutzomyia youngi infectados experimentalmente por ingurgitación sobre lesiones tarsales de hámsteres. La aparición de metacíclicos en la hipofaringe, cuya morfología se ilustra, ocurre entre los 5 y 9 días de desarrollo postprandial y es más frecuente en insectos alimentados con sacarosa comercial no refinada. Se investiga el papel de derivados aminados de glucosa y galactosa y también de aminoácidos, en la promoción y migración de los metacíclicos.

          Translated abstract

          The presence of metacyclical promastigotes of Leishmania pifanoi in the hypopharyngeal duct of Lutzomyia youngi is reported. The insects were experimentally infected by engorgement on the tarsal lesions of hamsters. The metacyclics, whose morphology is illustrated, appeared in the hypopharynx 5 to 9 days after engorgement; they were more frequently found in the insects fed on unrefined commercial sugar. They role of amino derivates of glucose and galactose, as well as of amino acids in the development and migration of metacyclics, is investigated.

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          Most cited references27

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          Leishmania differentiation in natural and unnatural sand fly hosts.

          Leishmania differentiation in the gut of phlebotomine sand flies was evaluated based on five light and electron microscopic studies of natural (Leishmania panamensis/Lutzomyia gomezi, Leishmania chagasi/Lutzomyia longipalpis) and unnatural (Leishmania mexicana/Lutzomyia abonnenci, Leishmania panamensis/Phlebotomus papatasi, Leishmania major/Lutzomyia longipalpis) life cycles. In the bloodmeal, transformation of amastigotes into stumpy promastigotes occurred before or during division. Further division in pairs or rosettes resulted in the development of spatulate and/or elongate nectomonad (free-swimming) promastigotes. Elongate, short, and metacyclic nectomonad promastigotes, and nectomonad paramastigotes were present in the midgut lumen. Dividing short promastigotes predominated in the cardia, and appeared to generate metacyclic forms which were observed in three life cycles. Haptomonad (attached) forms of Leishmania panamensis in the hindgut were primarily spatulate promastigotes (natural host) or pear-shaped promastigotes (unnatural host); paramastigotes and dividing forms were rare. At the stomodeal valve, short haptomonad promastigotes predominated in unnatural hosts, while both short and pear-shaped haptomonads were abundant, along with paramastigotes in natural hosts. Haptomonad paramastigotes and pear-shaped promastigotes colonized the esophagus, while paramastigotes predominated in the pharynx. Metacyclics were free-swimming in the lumen of the foregut.
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            Leishmania donovani metacyclic promastigotes: transformation in vitro, lectin agglutination, complement resistance, and infectivity.

            Freshly transformed Leishmania donovani amastigotes from hamster spleen were used to establish axenic cultures at high density in a modified Grace's medium, which was only partly replenished when cultures were fed. Small, free-swimming, highly active stationary phase promastigotes with a short cell body and long flagellum were induced in this medium. The freshly transformed stationary phase promastigotes so induced were less able to bind peanut agglutinin, had more than 40-fold increased resistance to killing by normal human serum, and 15-fold increased infectivity both in vivo and in vitro when compared to freshly transformed logarithmic phase or long term culture promastigotes. These short form promastigotes may correspond to the metacyclic promastigote forms in the sand fly vector.
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              Honeydew of aphids as a source of sugar for Phlebotomus ariasi.

              Wild-caught Phlebotomus ariasi Tonnoir, starved until their sugar meals had been digested, were caged for 24 h with plants or plants infested with aphids and then tested for fructose, a constituent of plant sap. No evidence was found that the flies took sap directly from nine types of plants present in their habitat. About two-thirds of flies caged with oak (Quercus ilex L.) infested with an aphid [Lachnus roboris (L.)] and about a fifth kept with leaves of the french bean (Phaseolus vulgaris L.) infested with an aphid took honeydew. Experiments with three other aphid species gave negative results. Of sandflies caught in an oak tree infested with aphids, half of the females and three-quarters of the males contained fructose. Tests on females caught in a house and grouped according to state of engorgement showed that, having taken blood, the females stop taking sugar until the bloodmeal is completely digested. It is predicted that honeydews are important in the development of Leishmania infantum Nicolle in the gut of P. ariasi.
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                Author and article information

                Journal
                rsp
                Revista de Saúde Pública
                Rev. Saúde Pública
                Faculdade de Saúde Pública da Universidade de São Paulo (São Paulo, SP, Brazil )
                0034-8910
                1518-8787
                June 1996
                : 30
                : 3
                : 240-247
                Affiliations
                [01] Trujillo orgnameCentro de Investigaciones Parasitológicas orgdiv1Control de Vectores orgdiv2Laboratorio de Quimioterapia Venezuela
                Article
                S0034-89101996000300006 S0034-8910(96)03000306
                10.1590/S0034-89101996000300006
                1f5e6975-681d-4a1b-8969-b98d05ff7b67

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 20 March 1995
                : 05 January 1996
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 20, Pages: 8
                Product

                SciELO Public Health

                Self URI: Texto completo solamente en formato PDF (ES)

                Psychodidae,Leishmania mexicana,Sucrose,Sacaroso
                Psychodidae, Leishmania mexicana, Sucrose, Sacaroso

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