1887

Abstract

The biochemical events triggered by viral infection are critical to the outcome of a host immune response. Porcine reproductive and respiratory syndrome virus (PRRSV) causes the most significant disease of swine worldwide. Onset of infection is insidious and subclinical. Clinical signs may not appear for days and antibodies cannot be detected for a week or more. To understand better the early pathophysiological response of swine to PRRSV infection and its inapparent onset, we examined serum samples in the first days of infection for evidence of early biochemical changes. Sera from pigs infected with various isolates of PRRSV were extracted to remove high molecular mass proteins, desalted and analysed by matrix assisted laser desorption/ionization–time of flight mass spectrometry (MS). Comparative analysis of low molecular mass serum protein profiles revealed that one protein, with an / value of 9244±2, appeared within 1 day of infection. The 9244±2 peak was identified as the alpha 1S (1S)-subunit of porcine haptoglobin (Hp) by tandem MS sequencing and confirmed by immunoblotting with anti-porcine Hp antibody. Hp is an acute phase haem-binding protein consisting of heterodimers that is secreted from the liver in response to stresses, including infection. However, the presence of free 1S-subunit in response to infection is novel and may provide new insights into biochemical processing of Hp and its role in disease pathogenesis, including PRRS.

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2008-11-01
2024-03-28
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