Abstract
In this paper the cloning of interleukin-1 beta (IL-1 beta) from the fish Dicentrarchus labrax (sea bass) is described. Using degenerate primers designed from known IL-1 beta 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-1 beta. 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-1 beta sequences. Expression studies show that sea bass IL-1 beta 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-1 beta 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-1 beta from other vertebrates is presented. (C) 2001 Academic Press.
Original language | English |
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Pages (from-to) | 711-726 |
Number of pages | 16 |
Journal | Fish & Shellfish Immunology |
Volume | 11 |
Issue number | 8 |
DOIs | |
Publication status | Published - Nov 2001 |
Keywords
- interleukin-1 beta
- fish
- sea bass Dicentrarchus labrax
- cytokines
- cytokine evolution
- leucocytes
- trout oncorhynchus-mykiss
- sequence
- cells
- macrophages
- alighnment
- monocytes
- gene
- acid