title: Excretory/secretory products of sheep abomasal nematode parasites cause vacuolation and increased neutral red uptake by HeLa cells.
abstract: Excretory/secretory (ES) products of Ostertagia (Teladorsagia) circumcincta and Haemonchus contortus have been implicated in the inhibition of gastric acid secretion and vacuolation, and the loss of parietal cells associated with abomasal parasitism. Vacuolation of epithelial (HeLa) cells caused by adult O. circumcincta or L3 O. circumcincta or H. contortus ES products have been examined by differential interference contrast microscopy and by the neutral red uptake assay. ES products caused visible vacuolation of HeLa cells, and this effect was enhanced by 8 mM NH4Cl. Some parasite ES products caused a marked detachment of cells from the coverslip. At lower concentrations of ES products, neutral red uptake was usually increased above the control, but at higher concentrations of ES products, uptake was often decreased, probably because of cell detachment. Although generally consistent with direct observations of HeLa cell vacuolation by parasite chemicals, neutral red uptake was not a satisfactory quantitative assay.
authors.affiliation: Department of Medicine, University of Liverpool, Liverpool, L69 3BX, UK.
authors.forename: Sabine
authors.initials: S
authors.lastname: Przemeck
authors.forename: Alexandra
authors.initials: A
authors.lastname: Huber
authors.forename: Simon
authors.initials: S
authors.lastname: Brown
authors.forename: Kevin C
authors.initials: KC
authors.lastname: Pedley
authors.forename: Heather V
authors.initials: HV
authors.lastname: Simpson
mesh_terms: D000018:Abomasum / Q000469:parasitology* / Q000473:pathology; D000818:Animals; D006188:Haemonchiasis / Q000469:parasitology / Q000473:pathology / Q000662:veterinary; D006189:Haemonchus / Q000378:metabolism / Q000472:pathogenicity*; D006367:HeLa Cells; D015801:Helminth Proteins / Q000378:metabolism*; D006801:Humans; D009499:Neutral Red / Q000378:metabolism*; D010028:Ostertagia / Q000378:metabolism / Q000472:pathogenicity*; D010029:Ostertagiasis / Q000469:parasitology / Q000473:pathology / Q000662:veterinary; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology / Q000473:pathology; D014617:Vacuoles
chemical_list: D015801:Helminth Proteins; D009499:Neutral Red
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