Nramp1 gene affects selective early steps in macrophage-mediated anti-cryptococcal defense
Identifieur interne : 002349 ( Main/Curation ); précédent : 002348; suivant : 002350Nramp1 gene affects selective early steps in macrophage-mediated anti-cryptococcal defense
Auteurs : Elisabetta Blasi [Italie] ; Bruna Colombari [Italie] ; Anna Mucci [Italie] ; Andrea Cossarizza [Italie] ; Danuta Radzioch [Canada] ; Johan R. Boelaert [Belgique] ; Rachele Neglia [Italie]Source :
- Medical Microbiology and Immunology [ 0300-8584 ] ; 2001-09-01.
English descriptors
Abstract
Abstract: Cryptococcus neoformans is an opportunistic fungus responsible for severe and often recurrent meningoencephalitis in immunodepressed patients. Initial evidence suggests that C. neoformans is a facultative intracellular pathogen; however, the strategies by which C. neoformans undergoes survival and eventually proliferation have not been elucidated. We investigated the role of Nramp1 gene in macrophage-mediated anti-cryptococcal defense. Using cell lines expressing the functional, mutated or knockout gene, it was established that Nramp1 (1) is not involved in the phagocytic event, (2) influences anti-cryptococcal activity in the early steps but not at later times, and (3) is unrelated to the biomolecular pathways through which C. neoformans impairs macrophage secretory response. Although the functional role of Nramp1 is still far from being elucidated, the present data add insight into its involvement in macrophage-mediated antimicrobial defense, particularly in the initial steps allowing C. neoformans growth inhibition.
Url:
DOI: 10.1007/s004300100066
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<front><div type="abstract" xml:lang="en">Abstract: Cryptococcus neoformans is an opportunistic fungus responsible for severe and often recurrent meningoencephalitis in immunodepressed patients. Initial evidence suggests that C. neoformans is a facultative intracellular pathogen; however, the strategies by which C. neoformans undergoes survival and eventually proliferation have not been elucidated. We investigated the role of Nramp1 gene in macrophage-mediated anti-cryptococcal defense. Using cell lines expressing the functional, mutated or knockout gene, it was established that Nramp1 (1) is not involved in the phagocytic event, (2) influences anti-cryptococcal activity in the early steps but not at later times, and (3) is unrelated to the biomolecular pathways through which C. neoformans impairs macrophage secretory response. Although the functional role of Nramp1 is still far from being elucidated, the present data add insight into its involvement in macrophage-mediated antimicrobial defense, particularly in the initial steps allowing C. neoformans growth inhibition.</div>
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