Clinical and food Listeria monocytogenes isolates, pre-exposed to mild acidic conditions, were able to readily develop acid tolerance, irrespective of their origin. We attempted to investigate the influence of acid tolerance mechanisms, either constitutive or induced, on the invasive behaviour of this facultative food-borne pathogen. Entry efficiency and intracellular growth of acid-tolerant strains were evaluated in in vitro cell models capable to mimic in vivo target cells, such as enterocytes and macrophages. An acid-adapted L. monocytogenes wild-type strain and a constitutively acid-tolerant mutant were able to enter enterocyte-like (Caco-2) cells as well as to survive and proliferate intracellularly in lipopolysaccharide-treated macrophage-like (J774.A1) cells, at a significant increased extent by respect of the non acid-adapted wild-type strain. These findings add new information about the influence of the acid tolerance response on L. monocytogenes virulence, suggesting that in acid-adapted bacteria the early events of pathogenesis which allow the colonization and the spread of bacteria in the host may be highly promoted, (C) 2000 Academic Press.

Acid tolerance in Listeria monocytogenes influences invasiveness of enterocyte-like cells and macrophage-like cells / Conte, Maria Pia; G., Petrone; A. M., Di Biase; M. G., Ammendolia; F., Superti; Seganti, Lucilla. - In: MICROBIAL PATHOGENESIS. - ISSN 0882-4010. - STAMPA. - 29:3(2000), pp. 137-144. [10.1006/mpat.2000.0379]

Acid tolerance in Listeria monocytogenes influences invasiveness of enterocyte-like cells and macrophage-like cells

CONTE, Maria Pia;SEGANTI, Lucilla
2000

Abstract

Clinical and food Listeria monocytogenes isolates, pre-exposed to mild acidic conditions, were able to readily develop acid tolerance, irrespective of their origin. We attempted to investigate the influence of acid tolerance mechanisms, either constitutive or induced, on the invasive behaviour of this facultative food-borne pathogen. Entry efficiency and intracellular growth of acid-tolerant strains were evaluated in in vitro cell models capable to mimic in vivo target cells, such as enterocytes and macrophages. An acid-adapted L. monocytogenes wild-type strain and a constitutively acid-tolerant mutant were able to enter enterocyte-like (Caco-2) cells as well as to survive and proliferate intracellularly in lipopolysaccharide-treated macrophage-like (J774.A1) cells, at a significant increased extent by respect of the non acid-adapted wild-type strain. These findings add new information about the influence of the acid tolerance response on L. monocytogenes virulence, suggesting that in acid-adapted bacteria the early events of pathogenesis which allow the colonization and the spread of bacteria in the host may be highly promoted, (C) 2000 Academic Press.
2000
atr; caco-2 cells; invasion; j774.a1 cells; l. monocytogenes; virulence
01 Pubblicazione su rivista::01a Articolo in rivista
Acid tolerance in Listeria monocytogenes influences invasiveness of enterocyte-like cells and macrophage-like cells / Conte, Maria Pia; G., Petrone; A. M., Di Biase; M. G., Ammendolia; F., Superti; Seganti, Lucilla. - In: MICROBIAL PATHOGENESIS. - ISSN 0882-4010. - STAMPA. - 29:3(2000), pp. 137-144. [10.1006/mpat.2000.0379]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/249074
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