partially purified antigenic fractions of leishmania major promastigotes were obtained by sodium dodecyl sulfate (sds-page) and electro-elution. three isolated protein fractions designated as frac tions (fr.) 1, 2, and 3 correspond to 40-60, 60-80, 80-100 kilodalton (kda) respectively. they were used for immunization of balb/c mice against leishmaniasis. the effects of these fractions on immune...

We have set up an assay to study the interactions of live pathogens with their hosts by using protein and glycosaminoglycan arrays probed by surface plasmon resonance imaging. We have used this assay to characterize the interactions of Leishmania promastigotes with ~70 mammalian host biomolecules (extracellular proteins, glycosaminoglycans, growth factors, cell surface receptors). We have ident...

abstract        background and objective: leishmania major is a flagellate protozoan parasite causing cutaneous leishmaniasis. although pentavalent antimony compounds are the first-line drugs for leishmaniasis, their application is often accompanied by numerous limitations and side effects. therefore, it is necessary to seek drugs of herbal origin that have fast-acting benefits and few side eff...

Leishmania amazonensis is the causative agent of American cutaneous leishmaniasis, an important neglected tropical disease. Once Leishmania amazonensis is inoculated into the human host, promastigotes are exposed to the extracellular matrix (ECM) of the dermis. However, little is known about the interaction between the ECM and Leishmania promastigotes. In this study we established L. amazonensi...

Background: Leishmaniasis is a parasitic disease that occurs in subtropical and tropical regions with approximately 350 million people worldwide 2 new cases annually. The annual increase cutaneous leishmaniasis (CL) observed, especially endemic areas such as Iran. Since there no effective vaccine, the detection of natural anti-leishmanial products essential. Objective: purpose this study was to...

Leishmaniases are diseases caused by protozoa of the genus Leishmania that affect more than 20 million people in the world. The initial phase of the infection is fundamental for either the progression or control of the disease. The Leishmania parasites are injected in the skin as promastigotes and then, after been phagocytized by the host macrophages, rapidly transform into amastigotes. In this...

Background: Leishmania is an intracellular protozoan parasite that enters and reproduces in macrophage cells. Macrophages are important immune cells phagocyte many pathogens such as bacteria, fungi, parasites spp. but incapable of killing this parasite, living the phagosomes infected macrophages, multiplying, resulting divesting macrophages appearance lesions. Many present drugs for treatment h...

BACKGROUND Pteridine metabolic pathway is unusual features of Leishmania, which is necessary for the growth of parasite. Leishmania has evolved a complex and versatile pteridine salvage network which has the ability of scavenging a wide area of the conjugated and unconjugated pteridines especially folate and biopterin. In this study, we focus on the inhibition of ptr1 gene expression. METHODS...

Protozoan parasites of the genus Leishmania alternate between flagellated, elongated extracellular promastigotes found in insect vectors, and round-shaped amastigotes enclosed in phagolysosome-like Parasitophorous Vacuoles (PVs) of infected mammalian host cells. Leishmania amazonensis amastigotes occupy large PVs which may contain many parasites; in contrast, single amastigotes of Leishmania ma...