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Necropsy-based Wild Fish Health Assessment
07:57

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Published on: September 11, 2018

Interaction between eicosanoids and the complement system in salmonid fish.

Andrew F Rowley1, Elizabeth L Morgan, Graham W Taylor

  • 1Department of Biosciences, College of Science, Swansea University, Swansea, SA2 8PP, UK. a.f.rowley@swansea.ac.uk

Developmental and Comparative Immunology
|June 11, 2011
PubMed
Summary
This summary is machine-generated.

The study shows that complement system activation in rainbow trout macrophages stimulates eicosanoid production, particularly prostaglandin E. This highlights an ancient interplay between innate immunity components in bony fish.

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Area of Science:

  • Immunology
  • Marine Biology
  • Biochemistry

Background:

  • The complement system and eicosanoid generation are ancient biological pathways.
  • Understanding their interplay is crucial for innate immunity research in vertebrates.

Purpose of the Study:

  • To investigate the interaction between the complement system and eicosanoid biosynthesis in rainbow trout macrophages.
  • To determine if complement fragments stimulate eicosanoid production in bony fish.

Main Methods:

  • Incubation of trout macrophages with zymosan-activated serum and purified complement fragment C3a-1.
  • Analysis of eicosanoids using combined mass spectrometry and high-performance liquid chromatography.
  • Measurement of phagocytosis levels.

Main Results:

  • Zymosan-activated trout serum significantly enhanced phagocytosis and eicosanoid generation (lipoxygenase and cyclooxygenase products) in macrophages.
  • Prostaglandin E (PGE) was identified as a key cyclooxygenase product.
  • Longer incubation with C3a-1 increased PGE generation, but not leukotriene B, without clear changes in cyclooxygenase expression.

Conclusions:

  • Complement activation by zymosan stimulates eicosanoid biosynthesis in rainbow trout macrophages.
  • The complement fragment C3a-1 induces a time-dependent increase in PGE production.
  • This study reveals an ancient functional link between complement and eicosanoids in bony fish immunity.