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Interleukin-10, interleukin-12, and interferon-gamma levels in the respiratory tract following mycoplasma hyopneumoniae and PRRSV infection in pigs.

Abstract：

:The cytokine profile associated with either a T helper 1 (Th1) or Th2 response in a porcine respiratory disease model was assessed by measuring IL-12, IL-10 and IFN-gamma using RT-PCR and ELISA, respectively. IL-10, IL-12, and IFN-gamma levels in pulmonary alveolar macrophages and bronchial lavage fluid were increased in pigs infected with porcine reproductive and respiratory syndrome virus (PRRSV), Mycoplasma hyopneumoniae, or both pathogens. At 10 days post-infection (DPI), both IL-10 and IL-12 mRNA levels were increased in both groups infected with PRRSV. The IL-12 levels were increased in pigs infected with both pathogens and IFN-gamma protein levels were increased in pigs infected with PRRSV alone and only numerically increased in the dual infection. At 28 DPI, IL-12 mRNA levels and IL-10 protein levels were increased in all infected groups. The mRNA level of IL-12 remained elevated in the group infected with both pathogens at 42 DPI. Production of IFN-gamma did not appear to be closely correlated with elimination of virus from the respiratory tract. However, when the virus existed in the lung, the local IFN-gamma production appeared to increase. Although IL-12 mRNA levels were significantly elevated in the pigs infected with both pathogens, the increased protein levels of IL-12 may compromise the immune system's ability to clear PRRSV from the lung. This could explain the prolonged presence of PRRSV, IFN-gamma production and the increased pneumonia observed in the lungs of dual-infected pigs. The increased levels of cytokines associated with both Th1 and Th2 responses in the respiratory tract of pigs infected with PRRSV and M. hyopneumoniae provides valuable information on the pathogenesis of these diseases.

journal_name

Viral Immunol

journal_title

Viral immunology

authors

Thanawongnuwech R,Thacker EL

doi

10.1089/088282403322396154

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

357-67

issue

3

eissn

0882-8245

issn

1557-8976

journal_volume

16

pub_type

杂志文章

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