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• W2912396408 abstract "Invasive candidiasis by Candida albicans is associated with high morbidity and mortality, due in part to the late implementation of an appropriate antifungal therapy hindered by the lack of an early diagnosis. We aimed to evaluate the in vitro antifungal activity of the antibodies against C. albicans germ tubes (CAGTA) raised in a rabbit model of candidemia. We measured the effect of CAGTA activity by colorimetric XTT and crystal violet assays, and colony forming units count, both on C. albicans planktonic cells and during the course of biofilm formation and maturation. Viability and cell morphology were assessed by optical, fluorescent or scanning electron microscopy. CAGTA ≥50 μg/ml caused a strong inhibition of C. albicans blastospores growth, and DiBAC fluorescent staining evidenced a fungicidal activity. Moreover, electron microscopy images revealed that CAGTA induced morphological alterations of the surface of C. albicans germ tubes grown free as well as in biofilm. Interestingly, CAGTA ≥80 μg/ml reduced the amount of C. albicans biofilm, and this effect started at the initial adhesion stage of the biofilm formation, during the first 90 min. This is the first report showing that CAGTA reduce C. albicans growth, and impair its metabolic activity and ability to form biofilm in vitro. The antigens recognized by CAGTA could be the basis for the development of immunization protocols that might protect against Candida infections. La infección invasora por Candida albicans está asociada a altas tasas de morbimortalidad, en parte debido al retraso en la instauración de una terapia antifúngica adecuada, dificultada a su vez por la falta de un diagnóstico precoz. Evaluar la actividad antifúngica de los anticuerpos contra tubos germinales de C. albicans (CAGTA) obtenidos a partir de un modelo animal de candidemia en conejo. El efecto de los CAGTA se evaluó mediante los ensayos colorimétricos XTT y cristal violeta, así como mediante el recuento de unidades formadoras de colonias, tanto en células planctónicas de C. albicans como en distintos estadios de formación y maduración de biopelículas. La viabilidad y la morfología de las células tratadas con CAGTA se determinó mediante microscopía óptica, de fluorescencia o electrónica (SEM). Concentraciones de CAGTA ≥ 50 μg/ml generaban una fuerte inhibición del crecimiento de C. albicans, y su actividad se mostró fungicida. Los CAGTA producían alteraciones en la superficie de los tubos germinales desarrollados tanto a partir de células en suspensión como de células en biopelículas. Además, concentraciones de CAGTA ≥ 80 μg/ml redujeron la biomasa de biopelículas de Candida, y este efecto se desencadenaba en los primeros 90 min de su formación. Este es el primer estudio que demuestra la capacidad de los CAGTA para reducir el crecimiento de C. albicans y su actividad metabólica, así como para alterar la formación de biopelículas in vitro. Los antígenos reconocidos por los CAGTA podrían servir de base para el desarrollo de protocolos de inmunización protectores frente a infecciones por Candida." @default.
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• W2912396408 date "2019-01-01" @default.
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• W2912396408 title "Anti-Candida albicans germ tube antibodies reduce in vitro growth and biofilm formation of C. albicans" @default.
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• W2912396408 doi "https://doi.org/10.1016/j.riam.2018.07.005" @default.
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