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leishmania parasites

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https://www.readbyqxmd.com/read/28319176/insight-into-the-mechanism-of-action-of-temporin-sha-a-new-broad-spectrum-antiparasitic-and-antibacterial-agent
#1
Zahid Raja, Sonia André, Feten Abbassi, Vincent Humblot, Olivier Lequin, Tahar Bouceba, Isabelle Correia, Sandra Casale, Thierry Foulon, Denis Sereno, Bruno Oury, Ali Ladram
Antimicrobial peptides (AMPs) are promising drugs to kill resistant pathogens. In contrast to bacteria, protozoan parasites, such as Leishmania, were little studied. Therefore, the antiparasitic mechanism of AMPs is still unclear. In this study, we sought to get further insight into this mechanism by focusing our attention on temporin-SHa (SHa), a small broad-spectrum AMP previously shown to be active against Leishmania infantum. To improve activity, we designed analogs of SHa and compared the antibacterial and antiparasitic mechanisms...
2017: PloS One
https://www.readbyqxmd.com/read/28319012/the-expanding-world-of-human-leishmaniasis
#2
James A Cotton
New Leishmania isolates form a novel group of human parasites related to Leishmania enrietti, with cases in Ghana, Thailand, and Martinique; other relatives infect Australian and South American wildlife. These parasites apparently cause both cutaneous and visceral disease, and may have evolved a novel transmission mechanism exploiting blood-feeding midges.
March 16, 2017: Trends in Parasitology
https://www.readbyqxmd.com/read/28306713/trypanocidal-effect-of-isotretinoin-through-the-inhibition-of-polyamine-and-amino-acid-transporters-in-trypanosoma-cruzi
#3
Chantal Reigada, Edward A Valera-Vera, Melisa Sayé, Andrea E Errasti, Carla C Avila, Mariana R Miranda, Claudio A Pereira
Polyamines are essential compounds to all living organisms and in the specific case of Trypanosoma cruzi, the causative agent of Chagas disease, they are exclusively obtained through transport processes since this parasite is auxotrophic for polyamines. Previous works reported that retinol acetate inhibits Leishmania growth and decreases its intracellular polyamine concentration. The present work describes a combined strategy of drug repositioning by virtual screening followed by in vitro assays to find drugs able to inhibit TcPAT12, the only polyamine transporter described in T...
March 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28303124/identification-and-characterization-of-mirnas-in-response-to-leishmania-donovani-infection-delineation-of-their-roles-in-macrophage-dysfunction
#4
Neeraj Tiwari, Vinod Kumar, Mallikarjuna Rao Gedda, Ashish K Singh, Vijay K Singh, Sreenivas Gannavaram, Surya P Singh, Rakesh K Singh
The outcome of Leishmania infection depends on parasite abilities to evade host immune response and its survival in hostile environment of host macrophages. Despite a wealth of gained crucial information, parasite strategies by which it dampens host macrophage functions remain poorly understood. Micro RNAs (miRNAs) are evolutionarily conserved class of endogenous 22-nucleotide small non-coding RNA gene products, described to participate in the regulation of almost every cellular process investigated so far...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28301305/molecular-characterization-of-leishmania-parasites-in-giemsa-stained-slides-from-cases-of-human-cutaneous-and-visceral-leishmaniasis-eastern-algeria
#5
Nadia Beldi, Roukaya Mansouri, Jihene Bettaieb, Alia Yaacoub, Hejer Souguir Omrani, Yusr Saadi Ben Aoun, Farida Saadni, Ikram Guizani, Souheila Guerbouj
BACKGROUND: In Algeria, visceral leishmaniasis (VL) is due to Leishmania (L.) infantum, while three cutaneous forms (CL) are caused by Leishmania major, Leishmania tropica and Leishmania infantum. In this study, the use of Giemsa-stained slides was evaluated with two PCR techniques, in Eastern Algeria. MATERIALS AND METHODS: A total of 136 samples corresponding to 100 CL smears (skin scrapings) and 36 VL slides (bone marrow aspirates) collected from 2008 to 2014 were tested...
March 16, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28301296/distinct-leishmania-infantum-strains-circulate-in-humans-and-dogs-in-the-emilia-romagna-region-northeastern-italy
#6
Gianluca Rugna, Elena Carra, Francesco Corpus, Mattia Calzolari, Daniela Salvatore, Romeo Bellini, Antonietta Di Francesco, Erica Franceschini, Antonella Bruno, Giovanni Poglayen, Stefania Varani, Fabrizio Vitale, Giuseppe Merialdi
Human leishmaniasis is an emerging problem in Italy and is on the increase in the Emilia-Romagna region, northeastern part of the country. Nevertheless, studies dealing with the molecular characterization of Leishmania spp. circulating in these areas are limited. In the present work, we explored the genetic polymorphism of Leishmania isolates from 28 cases of canine leishmaniasis and three cases of human visceral leishmaniasis (VL), which occurred in 2013-2014 in the Emilia-Romagna region. The characterization was carried out in comparison with nine human isolates of Leishmania from other VL endemic Italian regions and two reference strains...
March 16, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28294400/chronic-amastigote-negative-cutaneous-leishmaniasis-a-clinical-histopathologic-and-molecular-study-of-27-cases-with-emphasis-on-atypical-and-pseudolymphomatous-presentations
#7
Carlo Tomasini, Laura Moneghini, Maria Barbui Anna
BACKGROUND: Chronic amastigote-negative cutaneous leishmaniasis (CL) is a diagnostic challenge, as the parasite load may be low, or absent in biopsy tissue sections. METHODS: A series of consecutive biopsy specimens, taken from 130 patients with a diagnosis of granulomatous dermatitis of unknown etiology, were reviewed. PCR was carried out for Leishmania-specific DNA. RESULTS: A total of 27/130 samples were positive for Leishmania-specific DNA...
March 10, 2017: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/28292930/calcium-and-magnesium-ions-modulate-the-oligomeric-state-and-function-of-mitochondrial-2-cys-peroxiredoxins-in-leishmania-parasites
#8
Mariana A B Morais, Priscila O Giuseppe, Tatiana A C B Souza, Helena Castro, Rodrigo V Honorato, Paulo S L Oliveira, Luis E S Netto, Ana M Tomas, Mario T Murakami
Leishmania parasites have evolved a number of strategies to cope with the harsh environmental changes during mammalian infection. One of these mechanisms involves the functional gain that allowed mitochondrial 2-Cys peroxiredoxins to act as molecular chaperones when forming decamers. This function was demonstrated to be critical for the parasite infectivity in mammals and its activation was considered to be controlled exclusively by the enzyme redox state under physiological conditions. Herein, we revealed that magnesium and calcium ions play a major role in modulating the ability of these enzymes to act as molecular chaperones, surpassing the redox effect...
March 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28289158/annexin-a1-is-involved-in-the-resolution-of-inflammatory-responses-during-leishmania-braziliensis-infection
#9
Leandro G Oliveira, Míriam C Souza-Testasicca, Juliana P Vago, Amanda Braga Figueiredo, Adriana M C Canavaci, Luiza Oliveira Perucci, Tatiana P Teixeira Ferreira, Eduardo A F Coelho, Denise Utsch Gonçalves, Manoel Otávio C Rocha, Patrícia M R E Silva, Cláudia N Ferreira, Celso Queiroz-Junior, Lirlândia P Sousa, Ana Paula Fernandes
Leishmaniases are diseases caused by several Leishmania species. Leishmania (Viannia) braziliensis can cause localized cutaneous leishmaniasis (LCL), which heals spontaneously, or mucosal leishmaniasis (ML), characterized by chronic and intense inflammation and scanty parasitism. Annexin A1 (AnxA1) is a protein involved in modulation and resolution of inflammation through multiple mechanisms. In the present study, the role of AnxA1 was investigated in L. braziliensis-infected BALB/c mice. AnxA1 levels increased at the peak of tissue lesion and parasitism in infected mice...
March 13, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28288798/probing-the-efficacy-of-a-heterologous-leishmania-l-viannia-braziliensis-recombinant-enolase-as-a-candidate-vaccine-to-restrict-the-development-of-l-infantum-in-balb-c-mice
#10
Thaís T O Santos, Vívian T Martins, Daniela P Lage, Lourena E Costa, Beatriz C S Salles, Ana M R S Carvalho, Daniel S Dias, Patrícia A F Ribeiro, Miguel A Chávez-Fumagalli, Ricardo A Machado-de-Ávila, Bruno M Roatt, Danielle F de Magalhães-Soares, Daniel Menezes-Souza, Eduardo A F Coelho, Mariana C Duarte
In the present study, the Leishmania braziliensis enolase protein was evaluated as a vaccine candidate against visceral leishmaniasis (VL). The DNA sequence was cloned and the recombinant protein (rEnolase) was evaluated as a vaccine, associated with saponin, as an immune adjuvant. The protective efficacy of the rEnolase plus saponin combination was investigated in BALB/c mice against Leishmania infantum infection. The results revealed that the vaccine induced higher levels of IFN-γ, IL-12, and GM-CSF when a capture ELISA and flow cytometry were performed, as well as an antileishmanial nitrite production after using in vitro stimulation with rEnolase and an antigenic Leishmania preparation...
March 10, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28288670/histological-and-parasitological-distinctive-findings-in-clinically-lesioned-and-normal-looking-skin-of-dogs-with-different-clinical-stages-of-leishmaniosis
#11
Laura Ordeix, Annabel Dalmau, Montsant Osso, Joan Llull, Sara Montserrat-Sangrà, Laia Solano-Gallego
BACKGROUND: Normal-looking skin of dogs with leishmaniosis frequently shows microscopic lesions along with the presence of Leishmania amastigotes. However, histological lesions with or without detection of amastigotes might not occur in less severe clinical cases. In addition, comparative studies between paired clinically-lesioned and normal-looking skin samples from dogs with different disease severity are lacking. The objective of this study was to compare histological and parasitological findings by Leishmania immunohistochemistry (IHC) and quantitative PCR (qPCR) on paired clinically-lesioned and normal-looking skin biopsies from 25 dogs with different clinical stages of leishmaniosis, 11 with stage I-mild disease (papular dermatitis) and 14 with stage II-III (ulcerative or exfoliative dermatitis)...
March 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28288415/deciphering-the-interplay-between-cysteine-synthase-and-thiol-cascade-proteins-in-modulating-amphotericin-b-resistance-and-survival-of-leishmania-donovani-under-oxidative-stress
#12
Kuljit Singh, Vahab Ali, Krishn Pratap Singh, Parool Gupta, Shashi S Suman, Ayan K Ghosh, Sanjiva Bimal, Krishna Pandey, Pradeep Das
Leishmania donovani is the causative organism of the neglected human disease known as visceral leishmaniasis which is often fatal, if left untreated. The cysteine biosynthesis pathway of Leishmania may serve as a potential drug target because it is different from human host and regulates downstream components of redox metabolism of the parasites; essential for their survival, pathogenicity and drug resistance. However, despite the apparent dependency of redox metabolism of cysteine biosynthesis pathway, the role of L...
March 7, 2017: Redox Biology
https://www.readbyqxmd.com/read/28286529/a-synthetic-strategy-for-conjugation-of-paromomycin-to-cell-penetrating-tat-48-60-for-delivery-and-visualization-into-leishmania-parasites
#13
Sira Defaus, Maria Gallo, María A Abengózar, Luis Rivas, David Andreu
A successful approach to deliver paromomycin, a poorly absorbed aminoglycoside antibiotic, to parasite cells is reported, based on selective protection of amino and hydroxyl groups followed by conjugation to a fluorolabeled, PEG-functionalized cell-penetrating Tat(48-60) peptide. The resulting construct is efficiently internalized into Leishmania cells, evidencing the fitness of cell-penetrating peptides as vectors for efficiently transporting low-bioavailability drugs into cells.
2017: International Journal of Peptides
https://www.readbyqxmd.com/read/28285601/canine-leishmaniosis-caused-by-leishmania-major-and-leishmania-tropica-comparative-findings-and-serology
#14
Gad Baneth, Daniel Yasur-Landau, Matan Gilad, Yaarit Nachum-Biala
BACKGROUND: Infection and clinical disease associated with Leishmania major and Leishmania tropica, two common agents of human cutaneous leishmaniosis, have rarely been reported in dogs. This study describes dogs infected with these Leishmania spp. prevalent in the Middle East and North Africa, and compares the serological response of dogs infected with Leishmania infantum, L. major or L. tropica to whole promastigote antigen enzyme-linked immunosorbent assay (ELISA) of each species and to rK39 dipstick...
March 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28285499/clinico-epidemiological-patterns-of-cutaneous-leishmaniasis-patients-attending-the-anuradhapura-teaching-hospital-sri-lanka
#15
Lahiru Sandaruwan Galgamuwa, Buthsiri Sumanasena, Lalani Yatawara, Susiji Wickramasinghe, Devika Iddawela
Cutaneous leishmaniasis (CL) caused by Leishmania donovani is an endemic vector-borne disease in Sri Lanka. Over 2,500 cases have been reported since 2000 and the number of CL cases has dramatically increased annually. Total 57 clinically suspected CL patients attending the dermatology clinic in Anuradhapura Teaching Hospital were recruited from January to June 2015. Slit skin smears and skin biopsies were taken from each of the subjects. Clinical and epidemiological data were obtained using interviewer administered questionnaire...
February 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/28283781/gold-compounds-as-cysteine-protease-inhibitors-perspectives-for-pharmaceutical-application-as-antiparasitic-agents
#16
Lara Massai, Luigi Messori, Nicola Micale, Tanja Schirmeister, Louis Maes, Dolores Fregona, Maria Agostina Cinellu, Chiara Gabbiani
Gold compounds form a new class of promising metal-based drugs with a number of potential therapeutic applications, particularly in the fields of anticancer and antimicrobial treatments. Previous research revealed that a group of structurally diverse gold compounds cause conspicuous inhibition of the protease activities of the human proteasome. Given the pharmacological importance of protease inhibition, the present study further explored whether these gold compounds might inhibit a few other proteases that are accepted druggable targets for disease treatment...
March 10, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28283754/leishmania-donovani-chaperonin-10-regulates-parasite-internalization-and-intracellular-survival-in-human-macrophages
#17
Lucie Colineau, Joachim Clos, Kyung-Mee Moon, Leonard J Foster, Neil E Reiner
Protozoa of the genus Leishmania infect macrophages in their mammalian hosts causing a spectrum of diseases known as the leishmaniases. The search for leishmania effectors that support macrophage infection is a focus of significant interest. One such candidate is leishmania chaperonin 10 (CPN10) which is secreted in exosomes and may have immunosuppressive properties. Here, we report for the first time that leishmania CPN10 localizes to the cytosol of infected macrophages. Next, we generated two genetically modified strains of Leishmania donovani (Ld): one strain overexpressing CPN10 (CPN10+++) and the second, a CPN10 single allele knockdown (CPN10+/-), as the null mutant was lethal...
March 11, 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/28283071/comparison-of-myocardial-damage-among-dogs-at-different-stages-of-clinical-leishmaniasis-and-dogs-with-idiopathic-chronic-kidney-disease
#18
L Martínez-Hernández, D Casamian-Sorrosal, R Barrera-Chacón, J M Cuesta-Gerveno, S Belinchón-Lorenzo, L C Gómez Nieto, F J Duque-Carrasco
Canine leishmaniasis (CanL) is a systemic disease caused by the protozoan parasite Leishmania infantum. Myocarditis in CanL has been described previously in CanL by histopathological analysis of post-mortem specimens and by evaluation of cardiac troponin I (cTnI) levels. However, the degree of myocardial damage at different stages of CanL and the role that concurrent azotaemia plays in this myocardial injury are unknown. The aim of this study was to prospectively evaluate and compare the presence of myocardial injury in dogs at different stages of clinical CanL and in dogs with severe idiopathic chronic kidney disease (CKD) by measuring cTnI...
March 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28282886/chroman-4-one-derivatives-targeting-pteridine-reductase-1-and-showing-anti-parasitic-activity
#19
Flavio Di Pisa, Giacomo Landi, Lucia Dello Iacono, Cecilia Pozzi, Chiara Borsari, Stefania Ferrari, Matteo Santucci, Nuno Santarem, Anabela Cordeiro-da-Silva, Carolina B Moraes, Laura M Alcantara, Vanessa Fontana, Lucio H Freitas-Junior, Sheraz Gul, Maria Kuzikov, Birte Behrens, Ina Pöhner, Rebecca C Wade, Maria Paola Costi, Stefano Mangani
Flavonoids have previously been identified as antiparasitic agents and pteridine reductase 1 (PTR1) inhibitors. Herein, we focus our attention on the chroman-4-one scaffold. Three chroman-4-one analogues (1-3) of previously published chromen-4-one derivatives were synthesized and biologically evaluated against parasitic enzymes (Trypanosoma brucei PTR1-TbPTR1 and Leishmania major-LmPTR1) and parasites (Trypanosoma brucei and Leishmania infantum). A crystal structure of TbPTR1 in complex with compound 1 and the first crystal structures of LmPTR1-flavanone complexes (compounds 1 and 3) were solved...
March 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28280494/a-chimera-containing-cd4-and-cd8-t-cell-epitopes-of-the-leishmania-donovani-nucleoside-hydrolase-nh36-optimizes-cross-protection-against-leishmania-amazonesis-infection
#20
Marcus Vinícius Alves-Silva, Dirlei Nico, Alexandre Morrot, Marcos Palatnik, Clarisa B Palatnik-de-Sousa
The Leishmania donovani nucleoside hydrolase (NH36) and NH A34480 of Leishmania amazonensis share 93% of sequence identity. In mice, the NH36 induced protection against visceral leishmaniasis is mediated by a CD4+ T cell response against its C-terminal domain (F3). Besides this CD4+ Th1 response, prevention and cure of L. amazonensis infection require also additional CD8+ and regulatory T-cell responses to the NH36 N-terminal (F1 domain). We investigated if mice vaccination with F1 and F3 domains cloned in tandem, in a recombinant chimera, with saponin, optimizes the vaccine efficacy against L...
2017: Frontiers in Immunology
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