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The Journal of Immunology, Vol 158, Issue 2 859-864, Copyright © 1997 by American Association of Immunologists

ARTICLES

Eosinophils transcribe and translate messenger RNA for inducible nitric oxide synthase

V del Pozo, E de Arruda-Chaves, B de Andres, B Cardaba, A Lopez-Farre, S Gallardo, I Cortegano, L Vidarte, A Jurado, J Sastre, P Palomino and C Lahoz
Immunology Department, Jimenez Diaz Foundation, Madrid, Spain.

Because of the involvement of nitric oxide (NO) in inflammatory states such as parasitic and hypersensitivity disorders and the fact that eosinophils are one of the cell types implicated, we asked whether eosinophils were able to express mRNA specific to inducible NO synthase (iNOS) and iNOS protein and to secrete nitric oxide. iNOS protein was detected on eosinophil preparations by immunocytochemistry using iNOS mAb. Expression of iNOS protein was also detected by immunoblotting in human purified eosinophils and an eosinophilic leukemia cell line, Eol- 3. Nitrite production was detected in the supernatant of human eosinophils and Eol-3 cells cultured for 24 h, and was completely inhibited in the presence of the NOS inhibitor N-methylester-L- arginine. iNOS cDNA was obtained by reverse transcription-PCR. After subcloning, sequencing of the 259-bp fragment from three different human eosinophils cDNAs revealed 97% identity with macrophage/monocyte iNOS. Our studies describe for the first time the presence of iNOS on eosinophil and a putative new role for this cell in inflammatory states such as asthma and parasitic disease.


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