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Infection and Immunity, April 2001, p. 2527-2534, Vol. 69, No. 4
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.4.2527-2534.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Analysis of Chicken Mucosal Immune Response to Eimeria tenella and Eimeria maxima Infection by Quantitative Reverse Transcription-PCR

Fabrice Laurent,* Roselyne Mancassola, Sonia Lacroix, Rita Menezes, and Muriel Naciri

Unité de Pathologie Aviaire et de Parasitologie, Équipe des Maladies à Protozoaire, INRA, 37380 Nouzilly, France

Received 14 August 2000/Returned for modification 4 October 2000/Accepted 3 January 2001

The recent cloning of chicken genes coding for interleukins, chemokines, and other proteins involved in immune regulation and inflammation allowed us to analyze their expression during infection with Eimeria. The expression levels of different genes in jejunal and cecal RNA extracts isolated from uninfected chickens and chickens infected with Eimeria maxima or E. tenella were measured using a precise quantitative reverse transcription-PCR technique. Seven days after E. tenella infection, expression of the proinflammatory cytokine interleukin-1beta (IL-1beta ) mRNA was increased 80-fold. Among the chemokines analyzed, the CC chemokines K203 (200-fold) and macrophage inflammatory factor 1beta (MIP-1beta ) (80-fold) were strongly upregulated in the infected ceca, but the CXC chemokines IL-8 and K60 were not. However, the CXC chemokines were expressed at very high levels in uninfected cecal extracts. The levels of gamma interferon (IFN-gamma ) (300-fold), inducible nitric oxide synthase (iNOS) (200-fold), and myelomonocytic growth factor (MGF) (50-fold) were also highly upregulated during infection with E. tenella, whereas cyclooxygenase 2 showed a more modest (13-fold) increase. The genes upregulated during E. tenella infection were generally also upregulated during E. maxima infection but at a lower magnitude except for those encoding MIP-1beta and MGF. For these two cytokines, no significant change in expression levels was observed after E. maxima infection. CD3+ intraepithelial lymphocytes may participate in the IFN-gamma upregulation observed after infection, since both recruitment and upregulation of the IFN-gamma mRNA level were observed in the infected jejunal mucosa. Moreover, in the chicken macrophage cell line HD-11, CC chemokines, MGF, IL-1beta , and iNOS were inducible by IFN-gamma , suggesting that macrophages may be one of the cell populations involved in the upregulation of these cytokines observed in vivo during infection with Eimeria.

* Corresponding author. Mailing address: Unité de Pathologie Aviaire et de Parasitologie, Équipe des Maladies à Protozoaire, INRA, 37380 Nouzilly, France. Phone: (33) 02 47 42 77 45. Fax: (33) 02 47 42 77 74. E-mail: laurent{at}tours.inra.fr.

Infection and Immunity, April 2001, p. 2527-2534, Vol. 69, No. 4
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.4.2527-2534.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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