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Volume 145, Issue 10

interactions with fibronectin and laminin Free

Abstract

The sexually transmitted protozoan cytoadheres to vaginal epithelial cells and causes contact-dependent cytotoxicity which, when combined with the normal exfoliation process, leads to erosion of the epithelium, which may allow trichomonads into extracellular matrix and basement membrane sites. Therefore, the association of with immobilized fibronectin (FN) and laminin (LM) on cover-slips was examined. Binding of live parasites to coated cover-slips was time- and parasite-density-dependent. Coincubation with an inhibitor of trichomonad cysteine proteinases resulted in an increased attachment of parasites to FN but had no effect on binding to LM, denoting that protease activity influenced optimal FN associations. Further, 20 h mid-exponential phase trichomonads placed in fresh culture medium for 3 h gave higher levels of binding to FN, suggesting that changes during growth to organisms affect maximal levels of binding to FN. Extended incubation with substrates diminished the capacity of parasites to bind FN and LM. Treatment of live organisms with periodate reduced binding to LM but not FN, suggesting a role for carbohydrates. In addition, trypsinization of live parasites decreased numbers bound to both substrates. Placement of trypsinized parasites in medium for 2 h fully regenerated binding to FN but not LM. Incubation of trypsinized parasites with cycloheximide abrogated regeneration of attachment to FN, affirming a role for synthesized surface proteins in FN binding. Importantly, the adhesin proteins that mediate cytoadherence, and iron, a factor that regulates adhesin synthesis, were not involved in FN and LM recognition. These results suggest a role for surface proteins and carbohydrates in trichomonal associations with FN and LM, respectively.

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Keyword(s): BM, basement membrane , colonization , ECM, extracellular matrix , fibronectin , FN, fibronectin , laminin , LM, laminin , pathogenesis , TLCK, Nα-p-tosyl-L-lysine chloromethyl ketone , Trichomonas vaginalis and VECs, vaginal epithelial cells
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1999-10-01
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Trichomonas vaginalis interactions with fibronectin and laminin
Microbiology 145, 2835 (1999); https://doi.org/10.1099/00221287-145-10-2835
/content/journal/micro/10.1099/00221287-145-10-2835
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