Adherence of monocytes and polymorphonuclear cells to infective larvae of Strongyloides stercoralis after complement activation

I. J T De Messias, R. M. Genta, W. D. Mohren

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The activation of the complement system by living Strongyloides stercoralis filariform larvae and their antigenic preparation was demonstrated in vitro through both classical and alternative pathways. This activation does not require the presence of specific antibodies but promotes the adhesion of peripheral blood monocytes (MNC) and polymorphonuclear cells (PMNC) to the larval surface. Larvae, totally coated by PMNC, showed a visible loss of motility after 2 hr incubation. Ethylenediamine tetraacetic acid, in contrast to ethylene glycol-bis β-aminoethylether N,N,N,N- tetraacetic acid, abolished the adherence activity, suggesting the involvement of the alternative pathway in this process. Deposition of complement components C1q, C3, C4, C8, and properdin on the larval surface was demonstrated by immunofluorescence assays. In addition, complement activation by the larvae was demonstrated through C3 conversion and C4 cleavage assays, both depending on the number of larvae. On the other hand, complement activation by S. stercoralis antigen was determined by factor B and C4 cleavage, as well as C3 conversion assays. Our results suggest that the complement system as a first line of defense, in association with the effector cells, plays an important role in the nonspecific immune response of the host to S. stercoralis infection, especially considering the constant parasite recycling through the host tissues.

Original languageEnglish (US)
Pages (from-to)267-274
Number of pages8
JournalJournal of Parasitology
Volume80
Issue number2
StatePublished - 1994

Fingerprint

Strongyloides stercoralis
Complement Activation
monocytes
Larva
Monocytes
complement
larva
ethylenediamine
larvae
assay
cleavage
Complement C1q
Properdin
cells
assays
Acids
Complement Factor B
Ethylene Glycol
acid
Recycling

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Microbiology
  • Parasitology

Cite this

Adherence of monocytes and polymorphonuclear cells to infective larvae of Strongyloides stercoralis after complement activation. / De Messias, I. J T; Genta, R. M.; Mohren, W. D.

In: Journal of Parasitology, Vol. 80, No. 2, 1994, p. 267-274.

Research output: Contribution to journalArticle

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abstract = "The activation of the complement system by living Strongyloides stercoralis filariform larvae and their antigenic preparation was demonstrated in vitro through both classical and alternative pathways. This activation does not require the presence of specific antibodies but promotes the adhesion of peripheral blood monocytes (MNC) and polymorphonuclear cells (PMNC) to the larval surface. Larvae, totally coated by PMNC, showed a visible loss of motility after 2 hr incubation. Ethylenediamine tetraacetic acid, in contrast to ethylene glycol-bis β-aminoethylether N,N,N,N- tetraacetic acid, abolished the adherence activity, suggesting the involvement of the alternative pathway in this process. Deposition of complement components C1q, C3, C4, C8, and properdin on the larval surface was demonstrated by immunofluorescence assays. In addition, complement activation by the larvae was demonstrated through C3 conversion and C4 cleavage assays, both depending on the number of larvae. On the other hand, complement activation by S. stercoralis antigen was determined by factor B and C4 cleavage, as well as C3 conversion assays. Our results suggest that the complement system as a first line of defense, in association with the effector cells, plays an important role in the nonspecific immune response of the host to S. stercoralis infection, especially considering the constant parasite recycling through the host tissues.",
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