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Phenoloxidase-associated cellular defence in the Sydney rock oyster, Saccostrea glomerata, provides resistance against QX disease infections.

Abstract：

:The enzyme phenoloxidase is a critical component of the immunological defence of invertebrates. Previously, we have shown that the activity of phenoloxidase in Sydney rock oysters (Saccostrea glomerata) correlates with the severity of QX disease outbreaks. The aetiological agent of QX disease is the opportunistic protozoan parasite, Marteilia sydneyi. In this study, we examined the response of oyster haemocytes to challenge with M. sydneyi. Granular haemocytes were able to rapidly phagocytose parasite sporonts. Phagocytosis stimulated intracellular associated phenoloxidase activity that led to the complete melanisation of phagosomes. Significant differences in phagocytic indexes and phenoloxidase activities were observed between oysters selected for resistance to QX disease (QXR) and non-selected wild-type oysters. The data suggest that phagocytosis and cellular melanisation are critical defensive responses of Sydney rock oysters infected with M. sydneyi.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Butt D,Raftos D

doi

10.1016/j.dci.2007.06.006

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

299-306

issue

3

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(07)00092-4

journal_volume

32

pub_type

杂志文章

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