Abstract:
:Mollusks lack an adaptive immune system and rely solely on the innate immune response. The nuclear factor-kappa B (NF-κB) signaling pathway is one of the most important components of the innate immune system and its activity is regulated by physical interaction with the inhibitor of NF-κB (IκB) protein. The manila clam, Ruditapes philippinarum (Rp), is a key species of the world's aquaculture industry, and recent pathogenic threats, such as the Gram-negative lipopolysaccharide (LPS)-expressing Vibrio tapetis bacteria, have produced severe adverse economic impacts. Here, we describe identification, characterization and immune responses of novel IκB (Rp-IκB) in the manila clam. The Rp-IκB cDNA is comprised of a 1,032 bp open reading frame, which encodes 343 amino acid residues and has a predicted molecular mass of 38 kDa. The Rp-IκB protein exhibits typical structural features of IκB family members, including the IκB degradation motif, PEST sequence, and six ankyrin repeats. Phylogenetic analysis showed that manila clam and other known molluscan IκB proteins grouped together in the invertebrate cluster. Analysis of the tissue expression distribution revealed that Rp-IκB was ubiquitously expressed. However, immune challenge with V. tapetis and purified LPS endotoxin induced significant up-regulation of Rp-IκB expression in gill and hemocytes. These results indicated that Rp-IκB may play an important role in manila clam defense against bacterial infection.
journal_name
Mol Biol Repjournal_title
Molecular biology reportsauthors
Lee Y,Wickamarachchi WD,Whang I,Oh M,Umasuthan N,De Zoysa M,Oh C,Kang DH,Lee Jdoi
10.1007/s11033-012-2196-5subject
Has Abstractpub_date
2013-02-01 00:00:00pages
1519-27issue
2eissn
0301-4851issn
1573-4978journal_volume
40pub_type
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