Transcriptomic analysis reveals a Piscirickettsia salmonis-induced early inflammatory response in rainbow trout skeletal muscle

Victoria Carrizo, Cristián A. Valenzuela, Camila Aros, Phillip Dettleff, Valentina Valenzuela-Muñoz, Cristian Gallardo-Escarate, Claudia Altamirano, Alfredo Molina, Juan Antonio Valdés

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Skeletal muscle is the most abundant tissue in teleosts and is essential for movement and metabolism. Recently, it has been described that skeletal muscle can express and secrete immune-related molecules during pathogen infection. However, the role of this tissue during infection is poorly understood. To determine the immunocompetence of fish skeletal muscle, juvenile rainbow trout (Oncorhynchus mykiss) were challenged with Piscirickettsia salmonis strain LF-89. P. salmonis is the etiological agent of piscirickettsiosis, a severe disease that has caused major economic losses in the aquaculture industry. This gram-negative bacterium produces a chronic systemic infection that involves several organs and tissues in salmonids. Using high-throughput RNA-seq, we found that 60 transcripts were upregulated in skeletal muscle, mostly associated with inflammatory response and positive regulation of interleukin-8 production. Conversely, 141 transcripts were downregulated in association with muscle filament sliding and actin filament-based movement. To validate these results, we performed in vitro experiments using rainbow trout myotubes. In myotubes coincubated with P. salmonis strain LF-89 at an MOI of 50, we found increased expression of the proinflammatory cytokine il1b and the pattern recognition receptor tlr5s 8 and 12 h after infection. These results demonstrated that fish skeletal muscle is an immunologically active organ that can implement an early immunological response against P. salmonis.

Original languageEnglish
Article number100859
JournalComparative Biochemistry and Physiology - Part D: Genomics and Proteomics
Publication statusPublished - Sept 2021


  • Inflammatory response
  • Piscirickettsia salmonis
  • Rainbow trout
  • RNA-seq
  • Skeletal muscle

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Genetics


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