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• W3116577059 abstract "• Production of magnetic beads sensitized by polyclonal anti- Leishmania antibodies. • Development of an immunomagnetic separation (IMS) assay for Leishmania promastigote capture. • Immunomagnetic beads could capture Leishmania promastigotes with efficiency around 25-42%. • Usefulness of IMS followed by quantitative PCR in the identification of live Leishmania promastigotes in early stage of NNN cultures. Immunomagnetic Separation (IMS) assay has been used for isolation of viable whole organisms. The objective of our work is to produce anti- Leishmania magnetic beads and to assess the efficiency of the IMS technique on Leishmania promastigote capture in culture media. Polyclonal anti- Leishmania antibodies were produced by intravenous injection of viable metacyclic promastigotes of Leishmania ( L.) major to rabbit. Purified anti- Leishmania IgG was assessed for their reactivity against both L. major and L. infantum promastigotes then covalently conjugated to magnetic beads and used for IMS. This latter was applied on either L. major promastigote cultures of known concentrations or early stage (24h, 48h, 72h) Novy-MacNeal-Nicolle (NNN) cultures of tissue fluid obtained from cutaneous leishmaniasis (CL) lesions. Promastigotes capture was assessed by either microscopy or qPCR after sample boiling. Indirect immunofluorescence assay showed that polyclonal antibodies reacted against both L. major and L. infantum promastigotes. In 50 µL solution, immunomagnetic beads were able to capture 5 live promastigotes out of 20 and 1050 out of 2500, giving an estimated efficiency of 25-42%. The efficiency of the IMS was lower for a lower number of parasites but still repeatable. On the other hand, IMS-qPCR applied to 14 NNN cultures of confirmed Leishmania lesions showed a higher sensitivity to detect live parasites than routine microscopy observation of promastigotes growth (93% positivity at 72h versus 50% positivity within 2-4 weeks incubation). The estimated number of captured parasites at 72h ranged from 1 to more than 100 parasites / 50 µL liquid phase of culture. These preliminary results open the way for interesting perspectives in the use of cultures for leishmaniasis diagnosis and also for other applications such as Leishmania detection in cultures taken from reservoir animals or sandflies." @default.
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• W3116577059 date "2021-03-01" @default.
• W3116577059 modified "2023-10-10" @default.
• W3116577059 title "Use of Immunomagnetic Separation tool in Leishmania promastigotes capture" @default.
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• W3116577059 doi "https://doi.org/10.1016/j.actatropica.2020.105804" @default.
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