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  • Title: Phylogeny of cytokines: molecular cloning and expression analysis of sea bass Dicentrarchus labrax interleukin-1beta.
    Author: Scapigliati G, Buonocore F, Bird S, Zou J, Pelegrin P, Falasca C, Prugnoli D, Secombes CJ.
    Journal: Fish Shellfish Immunol; 2001 Nov; 11(8):711-26. PubMed ID: 11759041.
    Abstract:
    In this paper the cloning of interleukin-1beta (IL-1beta) from the fish Dicentrarchus labrax (sea bass) is described. Using degenerate primers designed from known IL-1beta sequences, a cDNA fragment was amplified by PCR and elongated by 3' and 5' RACE to give the full-length coding sequence for sea bass IL-1beta. The cDNA is 1292 bp, lacks a putative ICE cut site, and codes for a deduced peptide of 29.4 kDa with a pI of 5.1. Sequence analysis showed highest amino acid similarity with rainbow trout (62%), Xenopus (46%), and carp (45.5%) IL-1beta sequences. Expression studies show that sea bass IL-1beta can be upregulated by bacterial lipopolysaccharide both in vitro and in vivo in leucocytes from blood, head-kidney, spleen, gills and liver, whereas the IL-1beta transcript was not detectable in thymus and gut-associated lymphoid tissue. Northern blot analysis with head-kidney leucocyte RNA showed a main LPS-upregulated band at 1.3 kb, and two minor bands at 0.9 and 3.0 kb, respectively. Phylogenetic comparisons with IL-1beta from other vertebrates is presented.
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