Minor effect of depletion of resident macrophages from peritoneal cavity on resistance of common carp Cyprinus carpio to blood flagellates

Jeroen Saeij, Adrie Groeneveld, Nico Van Rooijen, Olga L M Haenen, Geert F. Wiegertjes

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Carp Cyprinus carpio macrophages were depleted by intraperitoneal (i.p.) injection of clodronate-liposomes for the in vivo study of the effect of macrophage depletion on the resistance of carp to infection with blood flagellate parasites. Clodronate released inside the cell induces apoptosis of (murine) macrophages. Following i.p. injection of carp with liposomes alone, but not with Trypanoplasma borreli, neutrophilic granulocytes rapidly migrated from the head kidney to the peritoneal cavity. The majority of liposomes in the peritoneal cavity were not taken up by newly arrived neutrophilic granulocytes, however, but by resident macrophages. After 2 i.p. injections of clodronate-liposomes, the percentage of macrophages present in the peritoneal cavity was significantly reduced, as evaluated by flow cytometry. Macrophage-depleted carp that were infected i.p. with T. borreli suffered from high mortality. However, these fish did not show lethal parasitaemia but did show clear bacteraemia. Macrophage-depleted carp that were infected i.p. with Trypanosoma carassii showed a minor increase in parasitaemia. In addition, macrophage-depleted carp, immune to T. borreli as a result of having survived a prior infection, remained immune to i.p. reinfection with T. borreli. Succesful depletion of peritoneal macrophages seemed to have a minor effect on the resistance of carp against blood flagellates. However, carp macrophages are essential as a first line of defence against (bacterial) infection.

Original languageEnglish (US)
Pages (from-to)67-75
Number of pages9
JournalDiseases of Aquatic Organisms
Volume57
Issue number1-2
StatePublished - Dec 3 2003
Externally publishedYes

Keywords

  • Clodronate
  • Cyprinus carpio
  • Macrophages
  • Trypanoplasma borreli
  • Trypanosoma carassii

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology

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