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https://www.readbyqxmd.com/read/28428784/the-roles-of-mast-cells-in-parasitic-protozoan-infections
#1
REVIEW
Fangli Lu, Shiguang Huang
Protozoan parasites such as Plasmodium spp., Leishmania spp., Trypanosoma spp., and Toxoplasma gondii are major causes of parasitic diseases in both humans and animals. The immune system plays a critical role against protozoa, but their immune mechanism remains poorly understood. This highlights the need to investigate the function of immune cells involved in the process of parasite infections and the responses of host immune system to parasite infections. Mast cells (MCs) are known to be central players in allergy and anaphylaxis, and it has been demonstrated that MCs have crucial roles in host defense against a number of different pathogens, including parasites...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28427904/leishmania-donovani-tyrosyl-trna-synthetase-structure-in-complex-with-a-tyrosyl-adenylate-analog-and-comparisons-with-human-and-protozoan-counterparts
#2
Ximena Barros-Álvarez, Keshia M Kerchner, Cho Yeow Koh, Stewart Turley, Els Pardon, Jan Steyaert, Ranae M Ranade, J Robert Gillespie, Zhongsheng Zhang, Christophe L M J Verlinde, Erkang Fan, Frederick S Buckner, Wim G J Hol
The crystal structure of Leishmania donovani tyrosyl-tRNA synthetase (LdTyrRS) in complex with a nanobody and the tyrosyl adenylate analog TyrSA was determined at 2.75 Å resolution. Nanobodies are the variable domains of camelid heavy chain-only antibodies. The nanobody makes numerous crystal contacts and in addition reduces the flexibility of a loop of LdTyrRS. TyrSA is engaged in many interactions with active site residues occupying the tyrosine and adenine binding pockets. The LdTyrRS polypeptide chain consists of two pseudo-monomers, each consisting of two domains...
April 17, 2017: Biochimie
https://www.readbyqxmd.com/read/28426408/isolation-and-molecular-characterization-of-a-naegleria-strain-from-a-recreational-water-fountain-in-tenerife-canary-islands-spain
#3
María Reyes-Batlle, Carolina Wagner, Atteneri López-Arencibia, Ines Sifaoui, Enrique Martínez-Carretero, Basilio Valladares, Jose E Piñero, Jacob Lorenzo-Morales
Free-Living Amoebae (FLA) are widely distributed protozoa in the environment and have been isolated from many sources such as dust, soil and water. Among the pathogenic genera included in this group Acanthamoeba spp., Naegleria fowleri and Balamuthia mandrillaris have been reported to be causative agents of lethal encephalitis, disseminated infections and keratitis. Naegleria fowleri is a pathogenic FLA species which causes Primary Amoebic Meningoencephalitis (PAM). At present there are not many available data on the distribution of Naegleria species in Spain from environmental sources...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28426403/pcr-denaturing-gradient-gel-electrophoresis-as-a-useful-method-to-identify-of-intestinal-bacteria-flora-in-haemaphysalis-flava-ticks
#4
Tian-Yin Cheng, Guo-Hua Liu
Ticks are blood-sucking ectoparasites of great medical and veterinary significance that can transmit bacteria, protozoa, fungi and viruses, causing a variety of human and animal diseases worldwide. In the present study, the intestinal bacterial flora associated with Haemaphysalis flava ticks in different developmental stages were analyzed using polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE). Eleven distinct DGGE bands were found using PCR-DGGE method. Sequences analyses indicated that they belonged to Bacillus cereus, Candidatus rickettsia, Erwinia sp...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28416689/contractile-and-chiral-activities-codetermine-the-helicity-of-swimming-droplet-trajectories
#5
Elsen Tjhung, Michael E Cates, Davide Marenduzzo
Active fluids are a class of nonequilibrium systems where energy is injected into the system continuously by the constituent particles themselves. Many examples, such as bacterial suspensions and actomyosin networks, are intrinsically chiral at a local scale, so that their activity involves torque dipoles alongside the force dipoles usually considered. Although many aspects of active fluids have been studied, the effects of chirality on them are much less known. Here, we study by computer simulation the dynamics of an unstructured droplet of chiral active fluid in three dimensions...
April 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28415906/effect-of-piplartine-and-cinnamides-on-leishmania-amazonensis-plasmodium-falciparum-and-on-peritoneal-cells-of-swiss-mice
#6
Keline Medeiros de Araújo-Vilges, Stefan Vilges de Oliveira, Shirley Claudino Pereira Couto, Harold Hilarion Fokoue, Gustavo Adolfo Sierra Romero, Massuo Jorge Kato, Luiz Antonio Soares Romeiro, José Roberto Souza Almeida Leite, Selma Aparecida Souza Kuckelhaus
CONTEXT: Plants of the Piperaceae family produce piplartine that was used to synthesize the cinnamides. OBJECTIVE: To assess the effects of piplartine (1) and cinnamides (2-5) against the protozoa responsible for malaria and leishmaniasis, and peritoneal cells of Swiss mice. MATERIALS AND METHODS: Cultures of Leishmania amazonensis, Plasmodium falciparum-infected erythrocytes, and peritoneal cells were incubated, in triplicate, with different concentrations of the compounds (0 to 256 μg/mL)...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/28414928/new-iminodibenzyl-derivatives-with-anti-leishmanial-activity
#7
Anderson Arndt, Cleber Wanderlei Liria, Jenicer K U Yokoyama-Yasunaka, M Terêsa Machini, Sílvia Reni Bortolin Uliana, Breno Pannia Espósito
Leishmaniasis is an infection caused by protozoa of the genus Leishmania and transmitted by sandflies. Current treatments are expensive and time-consuming, involving Sb(V)-based compounds, lipossomal amphotericin B and miltefosine. Recent studies suggest that inhibition of trypanothione reductase (TR) could be a specific target in the development of new drugs because it is essential and exclusive to trypanosomatids. This work presents the synthesis and characterization of new iminodibenzyl derivatives (dado) with ethylenediamine (ea), ethanolamine (en) and diethylenetriamine (dien) and their copper(II) complexes...
April 4, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28412947/report-of-the-first-clinical-case-of-intestinal-trichomoniasis-caused-by-tritrichomonas-foetus-in-a-cat-with-chronic-diarrhoea-in-brazil
#8
Aline S Hora, Samantha I Miyashiro, Fabiana C Cassiano, Paulo E Brandão, Archivaldo Reche-Junior, Hilda F J Pena
BACKGROUND: Tritrichomonas foetus is an emergent and important enteric pathogen of cats, which causes prolonged diarrhoea in cats. CASE PRESENTATION: This study describes a T. foetus infection in a seven-month-old, entire male domestic shorthair kitten with a six-month history of persistent large intestinal diarrhoea, faecal incontinence, prostration, apathy and weight loss. Parasites were microscopically observed and confirmed by PCR and DNA sequencing. Molecular analyses were carried out comparing the sequence obtained in this study with T...
April 17, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28411089/evidence-for-polymicrobial-communities-in-explanted-vascular-filters-and-atheroma-debris
#9
Jeremy E Ellis, Richard Heuser, Dara S Missan, Delyn Martinez, Avory Heningburg, Matthew Shabilla, Renata Schwartz, Stephen Fry
RATIONALE: Microbial communities have been implicated in a variety of disease processes and have been intermittently observed in arterial disease; however, no comprehensive unbiased community analysis has been performed. We hypothesize that complex microbial communities may be involved in chronic vascular diseases as well and may be effectively characterized by molecular assays. OBJECTIVE: The main objective is to survey vascular debris, atheroma, and vascular filters for polymicrobial communities consisting of prokaryotic and eukaryotic microbes, specifically eukaryotic microbes...
April 11, 2017: Molecular and Cellular Probes
https://www.readbyqxmd.com/read/28403147/cryptosporidium-spp-and-giardia-spp-in-feces-and-water-and-the-associated-exposure-factors-on-dairy-farms
#10
Roberta Dos Santos Toledo, Felippe Danyel Cardoso Martins, Fernanda Pinto Ferreira, Jonatas Campos de Almeida, Liza Ogawa, Hannah Lia Ettiene Peruch Lemos Dos Santos, Maíra Moreira Dos Santos, Filipe Aguera Pinheiro, Italmar Teodorico Navarro, João Luis Garcia, Roberta Lemos Freire
The aims of this study were to verify the prevalence of Cryptosporidium spp. and Giardia spp. in animal feces and drinking water on dairy farms and to identify a possible relation between the exposure factors and the presence of these parasites. Fecal samples from cattle and humans and water samples were collected on dairy farms in Paraná, Brazil. Analysis of (oo)cysts in the feces was performed by the modified Ziehl-Neelsen staining and centrifugal flotation in zinc sulfate. Test-positive samples were subjected to nested PCR amplification of the 18SSU ribosomal RNA gene for identification of Cryptosporidium and Giardia and of the gp60 gene for subtyping of Cryptosporidium...
2017: PloS One
https://www.readbyqxmd.com/read/28402567/nonsense-mediated-mrna-decay-in-tetrahymena-is-ejc-independent-and-requires-a-protozoa-specific-nuclease
#11
Miao Tian, Wentao Yang, Jing Zhang, Huai Dang, Xingyi Lu, Chengjie Fu, Wei Miao
Nonsense-mediated mRNA decay (NMD) is essential for removing premature termination codon-containing transcripts from cells. Studying the NMD pathway in model organisms can help to elucidate the NMD mechanism in humans and improve our understanding of how this biologically important process has evolved. Ciliates are among the earliest branching eukaryotes; their NMD mechanism is poorly understood and may be primordial. We demonstrate that highly conserved Upf proteins (Upf1a, Upf2 and Upf3) are involved in the NMD pathway of the ciliate, Tetrahymena thermophila...
April 11, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28390095/the-anti-trichomonas-vaginalis-phloroglucinol-derivative-isoaustrobrasilol-b-modulates-extracellular-nucleotides-hydrolysis
#12
Camila Braz Menezes, Graziela Vargas Rigo, Henrique Bridi, Danielle da Silva Trentin, Alexandre José Macedo, Gilsane Lino Von Poser, Tiana Tasca
Trichomonas vaginalis causes trichomoniasis, a neglected sexually transmitted disease. Due to severe health consequences and treatment failure, new therapeutic alternatives are crucial. Phloroglucinols from Southern Brazilian Hypericum species demonstrated anti-T. vaginalis and anti-Leishmania amazonensis activities. The modulation of biochemical pathways involved in the control of inflammatory response by ectonucleotidases, NTPDase and ecto-5'-nucleotidase, represents new targets for combating protozoa. This study investigated the activity of phloroglucinol derivatives of Hypericum species from Southern Brazil against T...
April 8, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28382023/antiprotozoal-effect-of-saponins-in-the-rumen-can-be-enhanced-by-chemical-modifications-in-their-structure
#13
Eva Ramos-Morales, Gabriel de la Fuente, Stephane Duval, Christof Wehrli, Marc Bouillon, Martina Lahmann, David Preskett, Radek Braganca, Charles J Newbold
The antiprotozoal effect of saponins is transitory, as when saponins are deglycosylated to the sapogenin by rumen microorganisms they become inactive. We postulated that the substitution of the sugar moiety of the saponin with small polar residues would produce sapogen-like analogs which might be resistant to degradation in the rumen as they would not be enzymatically cleaved, allowing the antiprotozoal effect to persist over time. In this study, we used an acute assay based on the ability of protozoa to break down [(14)C] leucine-labeled Streptococcus bovis and a longer term assay based on protozoal motility over 24 h to evaluate both the antiprotozoal effect and the stability of this effect with fifteen hederagenin bis-esters esterified with two identical groups, and five cholesterol and cholic acid based derivatives carrying one to three succinate residues...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28378987/stray-dogs-and-cats-as-potential-sources-of-soil-contamination-with-zoonotic-parasites
#14
Katarzyna Szwabe, Joanna Blaszkowska
INTRODUCTION AND OBJECTIVE: The main source of many zoonoses is soil contaminated with feline and canine faeces. Thus, the aim of this study was to estimate the prevalence of intestinal parasites in stray dogs and cats adopted in Lodz shelter (Poland). MATERIALS AND METHODS: In total, 163 faecal samples were collected from 95 dogs and 68 cats from 2011 to 2012. The samples were processed by sedimentation techniques using Mini Parasep®SF. RESULTS: Six parasite genera belonging to protozoa, cestoda, and nematoda, were found in dogs, while eight were found in cats...
March 22, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28373871/fc%C3%AE-receptor-heterogeneity-in-leukocyte-functional-responses
#15
REVIEW
Carlos Rosales
Antibodies participate in defense of the organism from all types of pathogens, including viruses, bacteria, fungi, and protozoa. IgG antibodies recognize their associated antigen via their two Fab portions and are in turn recognized though their Fc portion by specific Fcγ receptors (FcγRs) on the membrane of immune cells. Multiple types and polymorphic variants of FcγR exist. These receptors are expressed in many cells types and are also redundant in inducing cell responses. Crosslinking of FcγR on the surface of leukocytes activates several effector functions aimed toward the destruction of pathogens and the induction of an inflammatory response...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28369980/the-costa-of-trichomonads-a-complex-macromolecular-cytoskeleton-structure-made-of-uncommon-proteins
#16
Ivone de Andrade Rosa, Marjolly Caruso Brigido, Eidy de Oliveira Santos, Luiz Gonzaga, Russolina Benedeta Zingali, Ana Tereza R de Vasconcelos, Wanderley de Souza, Marlene Benchimol
BACKGROUND INFORMATION: The costa is a prominent striated fiber that is found in protozoa of the Trichomonadidae family that present an undulating membrane. It is composed primarily of proteins that have not yet been explored. In this study, we used cell fractionation to obtain a highly enriched costa fraction whose structure and composition was further analyzed by electron microscopy and mass spectrometry. RESULTS: Electron microscopy of negatively stained samples revealed that the costa, which is a periodic structure with alternating electron-dense and electron-lucent bands, displays three distinct regions, named the head, neck and body...
March 31, 2017: Biology of the Cell
https://www.readbyqxmd.com/read/28369798/immunotherapy-for-infectious-diseases-in-haematological-immunocompromise
#17
REVIEW
Maria-Teresa Cutino-Moguel, Chris Eades, Katayoun Rezvani, Darius Armstrong-James
Opportunistic infections remain a major problem across a broad spectrum of immunocompromised haematological patient groups, with viruses, bacteria, fungi and protozoa all presenting significant challenges. Given the major difficulties in treating many of these infections with the currently available antimicrobial chemotherapeutic arsenal, and the rapid emergence of antimicrobial resistance amongst all of the microbial kingdoms, novel strategies that enable host control or elimination of infection are urgently required...
March 29, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28368313/free-living-amoebae-as-hosts-for-and-vectors-of-intracellular-microorganisms-with-public-health-significance
#18
REVIEW
Carsten Balczun, Patrick L Scheid
Free-living amoebae (FLA) are parasites within both humans and animals causing a wide range of symptoms and act as hosts of, and vehicles for phylogenetically diverse microorganisms, called endocytobionts. The interaction of the FLA with sympatric microorganisms leads to an exceptional diversity within FLA. Some of these bacteria, viruses, and even eukaryotes, can live and replicate intracellularly within the FLA. This relationship provides protection to the microorganisms from external interventions and a dispersal mechanism across various habitats...
April 1, 2017: Viruses
https://www.readbyqxmd.com/read/28367781/simple-dialkyl-pyrazole-3-5-dicarboxylates-show-in-vitro-and-in-vivo-activity-against-disease-causing-trypanosomatids
#19
Felipe Reviriego, Francisco Olmo, Pilar Navarro, Clotilde Marín, Inmaculada Ramírez-Macías, Enrique García-España, María Teresa Albelda, Ramón Gutiérrez-Sánchez, Manuel Sánchez-Moreno, Vicente J Arán
The synthesis and antiprotozoal activity of some simple dialkyl pyrazole-3,5-dicarboxylates (compounds 2-6) and their sodium salts (pyrazolates) (compounds 7-9) against Trypanosoma cruzi, Leishmania infantum and Leishmania braziliensis are reported. In most cases the studied compounds showed, especially against the clinically significant amastigote forms, in vitro activities higher than those of the reference drugs (benznidazole for T. cruzi and glucantime for Leishmania spp.); furthermore, the low non-specific cytotoxicities against Vero cells and macrophages shown by these compounds led to good selectivity indexes, which are 8-72 times higher for T...
April 3, 2017: Parasitology
https://www.readbyqxmd.com/read/28365316/bacterial-arthropod-borne-diseases-in-west-africa
#20
REVIEW
C B Ehounoud, F Fenollar, M Dahmani, J D N'Guessan, D Raoult, O Mediannikov
Arthropods such as ticks, lice, fleas and mites are excellent vectors for many pathogenic agents including bacteria, protozoa and viruses to animals. Moreover, many of these pathogens can also be accidentally transmitted to humans throughout the world. Bacterial vector-borne diseases seem to be numerous and very important in human pathology, however, they are often ignored and are not well known. Yet they are in a phase of geographic expansion and play an important role in the etiology of febrile episodes in regions of Africa...
March 30, 2017: Acta Tropica
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