Using oligonucleotide primers based on mammalian nitric oxide synthases (SOS), expression of an inducible NOS (iNOS) gene was detected in head kidney and gill tissue of bacterially-challenged rainbow trout. Three overlapping fragments were amplified by RT-PCR and used to construct a contiguous sequence of 1410 bp, with high nucleotide homology to iNOS in birds (61%) and mammals (57-59%). The nucleotide sequence translated in one reading frame to produce a partial peptide containing 470 amino acids, with 69-71% amino acid homology with mammalian iNOS, 81% homology with chicken iNOS and 85% homology with a partial (492 bp) goldfish iNOS sequence. In vitro stimulation of head kidney macrophages with LPS also induced expression of the trout iNOS RNA. with optimal expression seen using 20 50 mu g/ml LPS at 2 h to 6 h post-stimulation. The evolutionary and functional significance of the trout iNOS sequence are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.
|Number of pages||15|
|Journal||Developmental and Comparative Immunology|
|Publication status||Published - 1999|
- MACROPHAGE CELL-LINE
- ACTIVATED MACROPHAGES
- CHANNEL CATFISH
- CDNA CLONING