Salmonella enterica serovar Typhimurium-infected pigs with different shedding levels exhibit distinct clinical, peripheral cytokine and transcriptomic immune response phenotypes

Date
2014-01-01
Authors
Knetter, Susan
Bearson, Shawn
Huang, Ting-Hua
Kurkiewicz, Dason
Nettleton, Dan
Schroyen, Martine
Nettleton, Dan
Berman, Daniel
Cohen, Valerie
Lunney, Joan
Ramer-Tait, Amanda
Wannemeuhler, Michael
Tuggle, Christopher
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Animal Science
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Statistics
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Animal ScienceStatisticsVeterinary Microbiology and Preventive Medicine
Abstract

Foodborne salmonellosis costs the US $2.7 billion/year, including $100.0 million in annual losses to pork producers. Pigs colonized with Salmonella are usually asymptomatic with varied severity and duration of fecal shedding. Thus, understanding the responses that result in less shedding may provide a mechanism for control. Fifty-four pigs were inoculated with Salmonella enterica serovar Typhimurium (ST) and clinical signs, fecal ST shedding, growth performance, peripheral cytokines and whole blood gene expression were measured. Persistently shedding (PS) pigs had longer pyrexia and elevated serum IL-1β, TNF-α and IFN-γ compared with low shedding (LS) pigs, while LS pigs had brief pyrexia, less shedding that decreased more rapidly and greater serum CXCL8 than PS pigs. The PS pigs up-regulated genes involved with the STAT1, IFNB1 and IFN-γ networks on d 2, while up-regulation of genes involved in immune response regulation were only detected in LS pigs. This is the first study to examine host responses to ST infection at a clinical, performance, cytokine and transcriptomic level. The results indicated that pigs with different shedding outcomes developed distinct immune responses within the first 2 d of ST infection, and elucidated alternative mechanisms that could be targeted to reduce Salmonella shedding and spread.

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This article is published as Knetter, Susan M., Shawn MD Bearson, Ting-Hua Huang, Dason Kurkiewicz, Martine Schroyen, Dan Nettleton, Daniel Berman et al. "Salmonella enterica serovar Typhimurium-infected pigs with different shedding levels exhibit distinct clinical, peripheral cytokine and transcriptomic immune response phenotypes." Innate immunity 21, no. 3 (2015): 227-241. doi: 10.1177/1753425914525812.

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