amebiasis/protease

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Molecular and Biochemical Properties of a Cysteine Protease of Acanthamoeba castellanii.

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Acanthamoeba spp. are free-living protozoa that are opportunistic pathogens for humans. Cysteine proteases of Acanthamoeba have been partially characterized, but their biochemical and functional properties are not clearly understood yet. In this study, we isolated a gene encoding cysteine protease

Pathogenesis of acute experimental liver amebiasis.

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Classical descriptions of the pathology of amebiasis portray the parasite as the cause of tissue damage and destruction, and in recent years a number of amebic molecules have been identified as virulence factors. In this review we describe a series of experiments that suggest a more complex

Entamoeba histolytica cysteine protease 2 (EhCP2) modulates leucocyte migration by proteolytic cleavage of chemokines.

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Human amoebiasis is a disease produced by infection with the protozoan Entamoeba histolytica currently affecting many millions of people worldwide. Amoebic colitis is the most common clinical manifestation. Host protective immunity involves participation of both humoral and cellular responses.

Acanthamoeba proteases contribute to macrophage activation through PAR1 , but not PAR2.

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AIM

Acanthamoeba infections are characterized by an intense localized innate immune response associated with an influx of macrophages. Acanthamoeba protease production is known to affect virulence. Herein, the ability of Acanthamoeba trophozoite proteases, of either the

Identification of EhICP1, a chagasin-like cysteine protease inhibitor of Entamoeba histolytica.

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Based on the Entamoeba histolytica genome project (www.sanger.ac.uk/Project/E_histolytical/) we have identified a cysteine protease inhibitor, EhICP1 (amoebiasin 1), with significant homology to chagasin. Recombinant EhICP1 inhibited the protease activity of papain and that of a trophozoite lysate

Anoikis potential of Entameba histolytica secretory cysteine proteases: evidence of contact independent host cell death.

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Mammalian epithelial, endothelial and various other cell types, upon their detachment from the extracellular matrix (ECM) undergo a specialized kind of apoptosis, known as anoikis. Entameba histolytica cysteine proteases have been implicated in degradation of the host ECM, which may induce anoikis

Antisense inhibition of Entamoeba histolytica cysteine proteases inhibits colonic mucus degradation.

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OBJECTIVE The exact role Entamoeba histolytica cysteine proteases play in overcoming the colonic mucus barrier, as a prerequisite to epithelial cell disruption, is not known. Herein, we determined whether E histolytica trophozoites expressing the antisense transcript to cysteine protease 5 (EhCP5)

Role of mucosal secretory immunity in the development of an amebiasis vaccine.

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Invasive colonic infection by the enteric protozoan Entamoeba histolytica elicits a mucosal anti-amebic IgA antibody response. The E. histolytica galactose-inhibitable adherence protein (GIAP) mediates parasite binding to colonic mucins and epithelial cells. Anti-GIAP secretory IgA antibodies are

Cysteine protease-binding protein family 6 mediates the trafficking of amylases to phagosomes in the enteric protozoan Entamoeba histolytica.

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Phagocytosis plays a pivotal role in nutrient acquisition and evasion from the host defense systems in Entamoeba histolytica, the intestinal protozoan parasite that causes amoebiasis. We previously reported that E. histolytica possesses a unique class of a hydrolase receptor family, designated the

Luminal host-defense mechanisms against invasive amebiasis.

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Most humans infected with the virulent protozoan parasite Entamoeba histolytica do not develop invasive disease. Available evidence indicates that beneficial bacteria and the mucus gel layer in the colon lumen protect the host mucosa. Glycosidases produced by some normal colonic bacteria and luminal

Vaccine potential of 56-66 kDa protease secreted by Entamoeba histolytica.

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Excretory/secretory (ES) antigens and sub-cellular fractions of E. histolytica (HM1:IMSS strain) were tested for the presence of common proteases using substrate gel electrophoresis. We obtained two E. histolytica proteases (56-66 kDa and 29 kDa) from ES material, soluble components and plasma

Modulation of endogenous Cysteine Protease Inhibitor (ICP) 1 expression in Entamoeba histolytica affects amoebic adhesion to Extracellular Matrix proteins.

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Entamoeba histolytica is an enteric tissue-invading protozoan parasite that causes amoebic colitis and occasionally liver abscess in humans. During tissue invasion, amoebic adhesion to host components is an important event for host cell death leading to successful invasion and infection. Among

EhCP112 is an Entamoeba histolytica secreted cysteine protease that may be involved in the parasite-virulence.

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EhCP112 is an Entamoeba histolytica protease that together with the EhADH112 protein forms the EhCPADH complex involved in trophozoite virulence. Here, we produced the recombinant EhCP112 and studied its relationships with extracellular matrix components and with target cells. A DNA fragment

Entamoeba histolytica Cyclooxygenase-Like Protein Regulates Cysteine Protease Expression and Virulence.

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The intestinal protozoan parasite Entamoeba histolytica (Eh) causes amebiasis associated with severe diarrhea and/or liver abscess. Eh pathogenesis is multifactorial requiring both parasite virulent molecules and host-induced innate immune responses. Eh-induced host

Entamoeba histolytica cytotoxin: purification, characterization, strain virulence, and protease activity.

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A heat-labile cytotoxin was isolated from virulent strains of axenically cultivated Entamoeba histolytica. Strains of E. histolytica representing a spectrum of virulence as determined in animal and in vitro models of disease were examined for cytotoxic activity. Extracts of virulent strain HM1

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