onchocerciasis/protease

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Pathogenesis of onchocercal dermatitis: possible role of parasite proteases and autoantibodies to extracellular matrix proteins.

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We examined the immunogenicity of various connective tissue proteins in patients with chronic onchocercal dermatitis and the effect of filarial proteases on this host-parasite interaction. Sera from patients with onchocerciasis reacted strongly with cuticular collagens from filarial parasites and

Onchocerca volvulus: expression and immunolocalization of a nematode cathepsin D-like lysosomal aspartic protease.

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The N-terminal region of the cathepsin D-like aspartic protease from the human filarial parasite Onchocerca volvulus was expressed as His-tag fusion protein. Light and electron microscopic immunohistology using antibodies against the recombinant protein showed labeling of lysosomes in the hypodermis

An insight into the sialome of Simulium guianense (DIPTERA:SIMulIIDAE), the main vector of River Blindness Disease in Brazil.

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BACKGROUND Little is known about the composition and function of the saliva in black flies such as Simulium guianense, the main vector of river blindness disease in Brazil. The complex salivary potion of hematophagous arthropods counteracts their host's hemostasis, inflammation, and

Guatemalan human onchocerciasis. I. Systematic analysis of patient populations, nodular antigens, and specific isotypic reactions.

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The population from five Guatemalan plantations in areas endemic for onchocerciasis was surveyed, and 1032 individuals were recruited to participate in our study. From physical examination, past clinical history (5 to 8 yr), laboratory evidence and sample availability, a group of 778 long term

pOVEX vector: prokaryotic expression and purification of onchocerciasis vaccine candidate antigens as fusion proteins with the 24 kD Onchocerca volvulus glutathione S-transferase.

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An expression vector, pOVEX, has been designed and constructed, combining the advantages of the expression vectors pGEX-3X and pJC2o. The pOVEX vector produces a fusion protein with the 24 kD Onchocerca volvulus glutathione S-transferase (OvGST2) which is easy to purify in one step from bacterial

Studies on a filarial antigen with collagenase activity.

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We examined the ability of two filarial species, Onchocerca volvulus and Brugia malayi, to solubilize collagen molecules from native collagen fibrils. Collagenolytic activity was detected in extracts of adult worms, in living microfilariae of O. volvulus and in live infective larvae and adult female

[Proteolytic activity of adult worm extracts of Onchocerca volvulus].

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Studying proteolytic activity of Onchocerca volvulus (nematode causing "river blindness") shows that it is able to digest a variety of substrates such as: azoalbumine, azocoll and elastin-orcein with specific activity of 0.28, 0.57 and 1.48 mg/hour/mg of extract respectively. These enzymes are

Identification and characterization of onchoastacin, an astacin-like metalloproteinase from the filaria Onchocerca volvulus.

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The tissue-invasive nematode Onchocerca volvulus causes skin and eye pathology in human onchocerciasis. While the adult females reside sessile in subcutaneous nodules, the microfilariae are abundantly released from the nodules, males and juvenile worms migrate through the host tissue.

Simukunin from the salivary glands of the black fly Simulium vittatum inhibits enzymes that regulate clotting and inflammatory responses.

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BACKGROUND Black flies (Diptera: Simuliidae) feed on blood, and are important vectors of Onchocerca volvulus, the etiolytic agent of River Blindness. Blood feeding depends on pharmacological properties of saliva, including anticoagulation, but the molecules responsible for this activity have not

Fine specificity of autoantibodies to calreticulin: epitope mapping and characterization.

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Extracellular calreticulin (CRT) as well as anti-CRT antibodies have been reported in patients with various autoimmune disorders and CRT has been implicated in 'epitope spreading' to other autoantigens such as the Ro/SS-A complex. In addition, antibodies against parasite forms of the endoplasmic

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