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Determination and characterization of bovine interleukin-17 cDNA.

Interleukin-17 (IL-17) is a proinflammatory cytokine produced by activated memory T cells, and it appears to play an upstream role in T cell-triggered inflammation by stimulating stromal cells to secrete other cytokines. We hypothesize that IL-17 plays a role in the recruitment of neutrophils in the bovine mammary gland during infection or immune-mediated inflammation. The rapid amplification of cDNA ends (RACE) method was used to obtain a cDNA of bovine IL-17 (BoIL-17) containing a 462-bp open reading frame (ORF) encoding a protein of 153 amino acids (aa) with a molecular mass of 17.2 kDa, a 23-residue NH(2)-terminal signal peptide, a single potential N-linked glycosylation site, and 6 cysteine residues. BoIL-17 protein shared 73.5% identity with the human protein and 67% with the mouse and rat proteins. Sf9 insect cells were transfected with BoIL-17 cDNA, and supernatant was tested for biologic activity on a primary culture of bovine mammary epithelial cells (MECs). mRNA synthesis of IL-6, IL-8, and growth-related oncogene alpha (Groalpha) was induced, suggesting a functional role for IL-17 in mammary immunity.