Immunolocalization of immune cells and cell cycle proteins in the bulbus arteriosus of Atlantic salmon (Salmo salar L.)

Muhammad Naveed Yousaf*, Erling Olaf Koppang, Jun Zou, Christopher John Secombes, Mark D. Powell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The bulbus arteriosus is the most anterior chamber of the teleost heart. The present study aimed to establish the presence, and to provide semi-quantitative information on the abundance, of several immune and cell-cycle proteins in the bulbus arteriosus of healthy Atlantic salmon (Salmo salar L.). Using immunohistochemistry, lymphocyte-like cells were identified in the bulbus arteriosus using antibodies to CD3ε and MHC class IIβ. Few PCNA positive cells were identified in post-smolt fish as compared to moderate levels of staining in fresh water fry. Interestingly no staining was evident in adult fish (1-3 kg), thus there was a loss of cells expressing cell-cycle regulatory proteins with ontogeny/progressive life-history stages. Eosinophilic granulocytes (EGCs) were identified in the bulbus arteriosus using TNFα and HIF1α antibodies. Anti-caspase 3 immune-reaction identified a strong endothelial cytoplasmic staining in the bulbus arteriosus. Taken together, the immunolocalization of immune-related molecules (CD3, MHC class II and TNFα), cell-cycle regulatory proteins (PCNA and HIF1α) and apoptosis markers (TUNEL, caspase 3) suggest that the bulbus arteriosus may have an immune component within its functional repertoire.

Original languageEnglish
Pages (from-to)64-69
Number of pages6
JournalFish & Shellfish Immunology
Early online date10 Feb 2016
Publication statusPublished - Apr 2016


  • Atlantic salmon
  • Bulbus arteriosus
  • Caspase
  • CD3
  • HIF1α
  • Immunohistochemistry
  • MHC II
  • TNFα


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