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The immunomodulation of a novel tumor necrosis factor (CgTNF-1) in oyster Crassostrea gigas.

Abstract：

:Tumor necrosis factor (TNF) is one of the most important cytokines involved in many processes in both vertebrate and invertebrate. In the present study, a new tumor necrosis factor with a typical TNF domain was identified in oyster Crassostrea gigas (designated CgTNF-1). CgTNF-1 shared low sequence identity and similarity with the TNF superfamily members from other vertebrate and invertebrate. After LPS stimulation, the mRNA expression of CgTNF-1 in haemocytes increased significantly and peaked at 12h (1.39±0.12, P<0.05) post treatment, and the expression of CgTNF-1 protein in haemolymph also increased obviously during 6-12h. When the oyster haemocytes were incubated with rCgTNF-1, its apoptosis and phagocytosis rate were both effectively induced and peaked at 12h post the treatment of rCgTNF-1 with the concentration of 100ngmL(-1) (23.3±3%, P<0.01), 50ngmL(-1) (5.3±0.6%, P<0.05) and 10ngmL(-1) (6.7±1.2%, P<0.05), respectively. After the co-stimulation of LPS and rCgTNF-1, the apoptosis and phagocytosis rate of oyster haemocytes, and the activities of PO and lysozyme in the haemolymph all increased significantly, and reached the peak at 12h (apoptosis rate 26.7±1.5%, P<0.01), 12h (phagocytosis rate 8.3±0.6%, P<0.01), 6h (PO 1.11±0.01Umg prot(-1), P<0.01) and 12h (lysozyme 168.9±8.3Umg prot(-1), P<0.05), respectively, which were significantly higher than that in the LPS group. Furthermore, the anti-bacteria activity in the LPS+TNF group was significantly higher than that in the LPS group during 6-12h. All the results collectively indicated that CgTNF-1 was involved in the oyster immunity and played a crucial role in the modulation of immune response including apoptosis and phagocytosis of haemocytes, and regulation of anti-bacterial activity as well as the activation of immune relevant enzymes.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Sun Y,Zhou Z,Wang L,Yang C,Jianga S,Song L

doi

10.1016/j.dci.2014.03.007

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

291-9

issue

2

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(14)00068-8

journal_volume

45

pub_type

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