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1.
J Parasitol ; 89(1): 105-12, 2003 Feb.
Article in English | MEDLINE | ID: mdl-12659311

ABSTRACT

Trichomonad total extracts (TTE), or vesicular (P30) and soluble (530) subcellular fractions from 3 pathogenic Trichomonas vaginalis strains (GT-3. GT-13. and GT-15), lysed both human and Sprague-Dawley rat erythrocytes in a time- and dose-dependent manner. The entire hemolytic activity of TTE was located in P30, showing 2 peaks of maximum activity, one at pH 6.0 and another at pH 8.0. in the presence of 1 mM Ca2+. Hemolytic activity on rat erythrocytes was greater at pH 6.0 16.71 +/- 0.33 hemolytic units IHU]/mg/hr to 11.60 +/- 0.24 HU/mg/hr) than at pH 8.0 (3.81 +/- 0.30 HU/mg/hr to 5.75 +/- 0.65 HU/mg/hr). and it was greater than that on human red blood cells at pH 6.0 (2.67 +/- 0.19 HU/mg/hr to 4.08 +/- 0.15 HU/mg/hr) or pH 8.0 (2.24 +/- 0.0 9 HU/mg/hr to 2.81 +/- 0.06 HU/mg/hr). The alkaline and acidic hemolytic activity diminished (60-93% at pH 6.0 and 78-93% at pH 8.0) by the effect of 80 microM Rosenthal's inhibitor, which also inhibited 27-45% and 29-54% trichomonad alkaline and acidic phospholipase A activities, respectively. Vesicles, vacuoles, and hydrogenosomes were rich in P30. Trichomonas vaginalis has a hemolytic PLA, which could be involved in its cytopathogenic mechanism.


Subject(s)
Erythrocytes/metabolism , Hemolysis/physiology , Phospholipases A/metabolism , Trichomonas vaginalis/metabolism , Animals , Calcium/metabolism , Dose-Response Relationship, Drug , Humans , Hydrogen-Ion Concentration , Phospholipases A/antagonists & inhibitors , Rats , Stearates/pharmacology , Trichomonas vaginalis/enzymology , Trichomonas vaginalis/pathogenicity , Virulence
2.
Vet. Méx ; 28(3): 231-4, jul.-sept. 1997. ilus
Article in Spanish | LILACS | ID: lil-227440

ABSTRACT

Se observaron numerosos Cryptosporidium en el borde ciliado de las células epiteliales del intestino delgado, en tres lechones de 10 semanas de edad. Estos hallazgos se asociaron con una severa atrofia de vellosidades y moderada infiltración linfoide en la lámina propia. Además, en todos estos casos hubo una severa neumonía intersticial y linfoproliferativa compatible con una infección por Mycoplasma. Los estudios bacteriológicos fueron negativos a cepas enteropatógenas de Salmonella y Pasteurella. Estos cerdos pertenecían a una piara con mala higiene y sujetos a masivos tratamientos con varios antibióticos. Aunque el principal papel patológico de Cryptosporidium no puede ser atribuido en éste, la infección por este protozoario podría estar involucrada en el desarrollo de las lesiones. La cryptosporidiosis ha sido previamente notificada en becerros en México, pero este constituye el primer informe en cerdos


Subject(s)
Animals , Atrophy , Swine/immunology , Cryptosporidium parvum/immunology , Cryptosporidium parvum/parasitology , Enteritis , Intestinal Mucosa/immunology
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