Neu1 deficiency increases the susceptibility of zebrafish to Edwardsiella piscicida infection via lysosomal dysfunction

[Display omitted] •Neu1-KO zebrafish showed the high susceptibility toward Edwardsiella piscicida.•Macrophage was normally activated in Neu1-KO zebrafish.•Lysosome accumulations were observed in Neu1-KO zebrafish.•Sia α2-3 linked sialyloligosaccharides accumulated in Neu1-KO macrophage.•Chloroquine...

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Bibliographic Details
Published in:Gene 2022-08, Vol.836, p.146667-146667, Article 146667
Main Authors: Sahashi, Daichi, Kubo, Yurina, Ishi, Mika, Ikeda, Asami, Yamasaki, Chiharu, Komatsu, Masaharu, Shiozaki, Kazuhiro
Format: Article
Language:English
Subjects:
lysosome
oligosaccharide
sialic acid
sialidase
zebrafish
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Summary:[Display omitted] •Neu1-KO zebrafish showed the high susceptibility toward Edwardsiella piscicida.•Macrophage was normally activated in Neu1-KO zebrafish.•Lysosome accumulations were observed in Neu1-KO zebrafish.•Sia α2-3 linked sialyloligosaccharides accumulated in Neu1-KO macrophage.•Chloroquine treatment enhanced E. piscicida infection in zebrafish. Neu1 is a lysosomal glycosidase that catalyzes the removal of sialic acids from glycoconjugates. Although Neu1 sialidase is highly conserved among vertebrates, the role of fish Neu1 is not fully understood because of its unique aquatic living situation. Compared to land animals, fish have a higher chance of bacterial infection, and to understand the role of fish Neu1, the susceptibility of Neu1 knockout zebrafish (Neu1-KO) was evaluated using Edwardsiella piscicida, a fish pathogen. Neu1-KO larvae showed high susceptibility to E. piscicida, despite the activation of macrophages, and presented increased lysosomal signals induced by the accumulation of Sia α2-3 linked oligosaccharides. The accumulation coincided with the signal of the macrophage marker, suggesting that the dysfunction of lysosomes in macrophages would result in a high susceptibility of Neu1-KO to E. piscicida. Chloroquine, an inhibitor of lysosomal degradation, induced high mortality of wild type zebrafish with E. piscicida infection accompanied by increased lysosomal accumulation, similar to Neu1-KO zebrafish. This study revealed that Neu1 sialidase plays a crucial role in the lysosomal degradation of macrophages with a bacterial infection.
ISSN:0378-1119
1879-0038
DOI:10.1016/j.gene.2022.146667