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Invasion and survival of Photobacterium damselae subsp. piscicida in non‐phagocytic cells of gilthead sea bream, Sparus aurata L.
Author(s) -
Acosta F,
Vivas J,
Padilla D,
Vega J,
Bravo J,
Grasso V,
Real F
Publication year - 2009
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.2009.01023.x
Subject(s) - biology , internalization , microbiology and biotechnology , cytochalasin , cytochalasin b , intracellular , cytoskeleton , dapi , cell culture , vibrio anguillarum , cytochalasin d , vibrio , bacteria , in vitro , cell , biochemistry , apoptosis , genetics
Fluorescence microscopy and gentamicin protection assays were used to investigate the ability of four Photobacterium damselae subsp. pisicida (Phdp) strains to adhere to and to invade the fish epithelial cell line, SAF‐1, derived from Sparus aurata . All strains tested were detected intracellularly using both techniques, although internalization levels varied among strains. Treatment with cytochalasin D and experiments carried out at 4 °C demonstrated that a functional host cell cytoskeleton and active cell metabolism are necessary for bacterial internalization. Intracellular bacteria were detected for up to 7 days with a round morphology and were stained with DAPI, indicating that some bacterial cells may remain viable inside SAF‐1 cells. Our in vitro findings indicate that Phdp are capable of adhering, entering and surviving within the non‐phagocytic epithelial cell line SAF‐1, which may be important for persistence and establishment of a carrier state in S. aurata .