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Toxoplasmosis gondii

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https://www.readbyqxmd.com/read/28096851/acetylcholinesterase-inhibitor-improves-learning-and-memory-impairment-induced-by-toxoplasma-gondii-infection
#1
Hossein Mahmoudvand, Vahid Sheibani, Hossein Keshavarz, Saeedeh Shojaee, Khadijeh Esmaeelpour, Naser Ziaali
BACKGROUND: Here, we established the mouse models of chronic toxoplasmosis by T. gondii Tehran strain to provide a good understanding about defining the possible association between T. gondii exposure and learning and memory impairments. Moreover, as secondary objective of the present study, we hypothesized whether administration of an acetylcholinesterase (AChE) inhibitor could reduce learning and memory impairments induced by T. gondii infection. METHODS: Twenty-four male BALB/c mice were used to establishment of latent toxoplasmosis...
April 2016: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/28093212/long-term-sera-storage-does-not-significantly-modify-the-interpretation-of-toxoplasmosis-serologies
#2
C Dard, S Bailly, T Drouet, H Fricker-Hidalgo, M P Brenier-Pinchart, H Pelloux
BACKGROUND: Serological investigation of Toxoplasma gondii can answer many questions about toxoplasmosis in human pathology. Along these lines, studies on serum storage in biobanks need to be performed especially in terms of determining the impact of storage on relevance of sera analysis after freezing. This study assessed the impact of long-term sera storage on the stability of anti-Toxoplasma immunoglobulins. MATERIAL AND METHODS: The stability of anti-Toxoplasma IgG and IgM was studied in 244 and 242 sera respectively, stored at -20°C from one month to ten years...
January 13, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28090819/toxoplasmic-encephalitis-relapse-rates-with-pyrimethamine-based-therapy-systematic-review-and-meta-analysis
#3
Mark P Connolly, Elizabeth Goodwin, Carina Schey, Jacqueline Zummo
Toxoplasmic encephalitis (TE) is caused by Toxoplasma gondii infection and can be a life-threatening disease in immunocompromised patients. This study evaluated the rate of relapse associated with pyrimethamine-based maintenance therapy (i.e. secondary prophylaxis) in patients with human immunodeficiency virus (HIV) or AIDs treated prior to and after the common use (i.e. 1996) of highly active antiretroviral therapy (HAART) (pre-HAART and post-HAART, respectively). PubMed, Google Scholar, and Cochrane databases were searched to 6 June 2016 using search terms: pyrimethamine, Daraprim, Fansidar, Metakelfin, Fansimef, 5-(4-chlorophenyl)-6-ethyl-2,4-pyrimidinediamine, encephalitis, cerebral, toxoplasmosis, toxoplasmic, and gondii...
January 16, 2017: Pathogens and Global Health
https://www.readbyqxmd.com/read/28086987/a-systematic-review-and-meta-analysis-of-the-seroprevalence-of-toxoplasma-gondii-in-cats-in-mainland-china
#4
Huan Ding, Yu-Meng Gao, Yao Deng, Poppy H L Lamberton, Da-Bing Lu
BACKGROUND: Toxoplasmosis is caused by Toxoplasma gondii which can infect all warm-blooded animals. As the most common feline definitive host, cats play a vital role in the transmission of T. gondii. However, national estimates of the seroprevalence of T. gondii in cats in mainland China are lacking, and therefore a systematic review and meta-analysis were performed to provide insight into national environmental transmission levels and potential transmission to humans. METHODS: Studies published up until July 1, 2016, on T...
January 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28075410/is-toxoplasma-gondii-a-trigger-of-bipolar-disorder
#5
REVIEW
Claudia Del Grande, Luca Galli, Elisa Schiavi, Liliana Dell'Osso, Fabrizio Bruschi
Toxoplasma gondii, a ubiquitous intracellular parasite, has a strong tropism for the brain tissue, where it forms intracellular cysts within the neurons and glial cells, establishing a chronic infection. Although latent toxoplasmosis is generally assumed to be asymptomatic in immunocompetent individuals, it is now clear that it can induce behavioral manipulations in mice and infected humans. Moreover, a strong relation has emerged in recent years between toxoplasmosis and psychiatric disorders. The link between T...
January 10, 2017: Pathogens
https://www.readbyqxmd.com/read/28069296/inflammatory-early-events-associated-to-the-role-of-p2x7-receptor-in-acute-murine-toxoplasmosis
#6
Gladys Corrêa, Carolina de Almeida Lindenberg, Aline Cristina de Abreu Moreira-Souza, Luiz Eduardo Baggio Savio, Christina Maeda Takiya, Camila Marques-da-Silva, Rossiane Claudia Vommaro, Robson Coutinho-Silva
Activation of the purinergic P2X7 receptor by extracellular ATP (eATP) potentiates proinflammatory responses during infections by intracellular pathogens. Extracellular ATP triggers an antimicrobial response in macrophages infected with Toxoplasma gondii in vitro, suggesting that purinergic signaling may stimulate host defense mechanisms against toxoplasmosis. Here, we provide in vivo evidence in support of this hypothesis, by showing that P2X7(-/-) mice are more susceptible than P2X7(+/+) mice to acute infection by the RH strain of T...
December 30, 2016: Immunobiology
https://www.readbyqxmd.com/read/28056837/vaccination-with-toxofilin-dna-in-combination-with-an-alum-monophosphoryl-lipid-a-mixed-adjuvant-induces-significant-protective-immunity-against-toxoplasma-gondii
#7
Pengxia Song, Shenyi He, Aihua Zhou, Gang Lv, Jingjing Guo, Jian Zhou, Yali Han, Huaiyu Zhou, Zhen Hao, Hua Cong
BACKGROUND: A widely prevalent disease, toxoplasmosis poses serious health threats to both humans and animals; therefore, development of an ideal DNA vaccine against Toxoplasma gondii is needed eagerly. The purpose of the present study is to assess the protective efficacy of a DNA vaccine encoding the T. gondii toxofilin gene (pEGFP-toxofilin). In addition, toxofilin DNA vaccine combined with the individual adjuvants, alum or monophosphoryl lipid A (MPLA), or a mixture of alum-MPLA adjuvant were screened for their ability to enhance antibody responses...
January 5, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28056829/seroprevalence-and-determinants-of-toxoplasmosis-in-pregnant-women-attending-antenatal-clinic-at-the-university-teaching-hospital-lusaka-zambia
#8
Christiana Frimpong, Mpundu Makasa, Lungowe Sitali, Charles Michelo
BACKGROUND: Toxoplasmosis is a neglected zoonotic disease which is prevalent among pregnant women especially in Africa. This study aimed to determine the seroprevalence and determinants of the disease among pregnant women attending antenatal clinic at the University Teaching Hospital (UTH). METHOD: A cross-sectional study was employed where 411 pregnant women attending antenatal clinic at UTH were interviewed using closed ended questionnaires. Their blood was also tested for Toxoplasma gondii IgG and IgM antibodies using the OnSite Toxo IgG/IgM Combo Rapid test cassettes by CTK Biotech, Inc, USA...
January 5, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28056092/improvement-and-evaluation-of-loop-mediated-isothermal-amplification-for-rapid-detection-of-toxoplasma-gondii-infection-in-human-blood-samples
#9
Xi-Meng Sun, Yong-Sheng Ji, Xian-Yong Liu, Mei Xiang, Guang He, Li Xie, Jing-Xia Suo, Xun Suo
Loop-mediated isothermal amplification (LAMP), an attractive DNA amplification method, was developed as a valuable tool for the rapid detection of Toxoplasma gondii. In this study, species-specific LAMP primers were designed by targeting the AF146527 sequence, which was a conserved sequence of 200- to 300-fold repetitive 529 bp fragment of T.gondii. LAMP reaction system was optimized so that it could detect the minimal DNA sample such as a single tachyzoite or 10 copies of recombinant plasmid. No cross-reactivity was found when using DNA from other parasites as templates...
2017: PloS One
https://www.readbyqxmd.com/read/28054995/antiparasitic-activity-of-sulfur-and-fluorine-containing-bisphosphonates-against-trypanosomatids-and-apicomplexan-parasites
#10
Tamila Galaka, Mariana Ferrer Casal, Melissa Storey, Catherine Li, María N Chao, Sergio H Szajnman, Roberto Docampo, Silvia N J Moreno, Juan B Rodriguez
Based on crystallographic data of the complexes 2-alkyl(amino)ethyl-1,1-bisphosphonates-Trypanosoma cruzi farnesyl diphosphate synthase, some linear 1,1-bisphosphonic acids and other closely related derivatives were designed, synthesized and biologically evaluated against T. cruzi, the responsible agent of Chagas disease and against Toxoplasma gondii, the etiologic agent of toxoplasmosis and also towards the target enzymes farnesyl pyrophosphate synthase of T. cruzi (TcFPPS) and T gondii (TgFPPS), respectively...
January 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28043380/survival-of-toxoplasma-gondii-tachyzoites-in-simulated-gastric-fluid-and-cow-s-milk
#11
Martin Koethe, Carolin Schade, Karsten Fehlhaber, Martina Ludewig
The protozoan parasite Toxoplasma gondii is one of the most important food-related pathogens worldwide. Besides contact to oocysts or ingestion of tissue cysts mainly by consumption of raw or undercooked meat from infected animals, raw milk is considered to be a risk factor and possible route of transmission for tachyzoites. This stage of the parasite is usually very sensitive to acidic pH and, therefore, considered unlikely to survive stomach passage. However, tachyzoites were shown to survive for several days in milk and there are also reports on transmission of toxoplasmosis via milk...
January 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28042412/molecular-detection-and-genotypic-characterization-of-toxoplasma-gondii-in-paraffin-embedded-fetoplacental-tissues-of-women-with-recurrent-spontaneous-abortion
#12
Amir Abdoli, Abdolhossein Dalimi, Haleh Soltanghoraee, Fatemeh Ghaffarifar
BACKGROUND: Congenital toxoplasmosis is an important cause of spontaneous abortion worldwide. However, there is limited information on detection and genotypic characterization of Toxoplasma gondii (T. gondii) in women with recurrent spontaneous abortion (RSA). The aim of this study is the molecular detection and genotypic characterization of T. gondii in formalin-fixed, paraffin-embedded fetoplacental tissues (FFPTs) of women with RSA that have referred to the Avicenna Research Institute in Tehran, Iran...
January 2017: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/28040304/validation-of-igg-igm-multiplex-plasmonic-gold-platform-in-french-clinical-cohorts-for-the-serodiagnosis-and-follow-up-of-toxoplasma-gondii-infection
#13
Christelle Pomares, Bo Zhang, Shylaja Arulkumar, Geraldine Gonfrier, Pierre Marty, Su Zhao, Steven Cheng, Meijie Tang, Hongjie Dai, Jose G Montoya
We report the use of the multiplexed T. gondii IgG, IgM test on plasmonic gold (pGOLD) platform in the setting of T. gondii infection by analyzing 244 sera from Nice, France (seroconversion, chronically infected, non-infected and newborns serum samples). Results were compared with commercial tests for the detection of IgG and IgM and their overall clinical final interpretation of a complete serological profile. The IgG and IgM test results on the platform were in agreement in, respectively, 95% and 93% with the commercial kits...
September 8, 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28030925/comparison-of-the-efficiency-of-two-commercial-kits-elfa-and-western-blot-in-estimating-the-phase-of-toxoplasma-gondii-infection-in-pregnant-women
#14
COMPARATIVE STUDY
Jacek Sroka, Angelina Wójcik-Fatla, Violetta Zając, Anna Sawczyn, Ewa Cisak, Jacek Karamon, Jacek Dutkiewicz, Iwona Bojar
Sera of 89 pregnant women were selected according to the results of ELFA IgM, IgG and avidity IgG, and tested with commercial tests IgM, IgG and avidity IgG Western Blot (WB) to compare the efficacy of both techniques in determining the phase of T. gondii infection. In total, 81 of 89 tested sera (91.0%) were classified as positive, both in the ELFA and WB tests for the presence of anti-Toxoplasma antibodies of class IgG, indicating a past infection, while the prevalence of anti-Toxoplasma positive reactions associated with the antibodies of class IgM indicating a recent infection was much lower - 31...
23, 2016: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28028000/phylogeography-of-toxoplasma-gondii-points-to-a-south-american-origin
#15
Emilie Bertranpetit, Thibaut Jombart, Emmanuel Paradis, Hilda Pena, Jitender Dubey, Chunlei Su, Aurélien Mercier, Sébastien Devillard, Daniel Ajzenberg
Toxoplasma gondii, a protozoan found ubiquitously in mammals and birds, is the etiologic agent of toxoplasmosis, a disease causing substantial public health burden worldwide, including about 200,000 new cases of congenital toxoplasmosis each year. Clinical severity has been shown to vary across geographical regions, with South America exhibiting the highest burden. Unfortunately, the drivers of these heterogeneities are still poorly understood, and the geographical origin and historical spread of the pathogen worldwide are currently uncertain...
December 24, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28026138/towards-a-molecular-architecture-of-the-centrosome-in-toxoplasma-gondii
#16
REVIEW
Juliette Morlon-Guyot, Maria E Francia, Jean-François Dubremetz, Wassim Daher
Toxoplasma gondii is the causative agent of toxoplasmosis. The pathogenicity of this unicellular parasite is tightly linked to its ability to efficiently proliferate within its host. Tachyzoites, the fast dividing form of the parasite, divide by endodyogeny. This process involves a single round of DNA replication, closed nuclear mitosis, and assembly of two daughter cells within a mother. The successful completion of endodyogeny relies on the temporal and spatial coordination of a plethora of simultaneous events...
December 27, 2016: Cytoskeleton
https://www.readbyqxmd.com/read/28012901/pravastatin-and-simvastatin-inhibit-the-adhesion-replication-and-proliferation-of-toxoplasma-gondii-rh-strain-in-hela-cells
#17
Raquel Arruda Sanfelice, Suelen Santos da Silva, Larissa Rodrigues Bosqui, Milena Menegazzo Miranda-Sapla, Bellisa Freitas Barbosa, Rafaela José Silva, Eloísa A Vieira Ferro, Luciano Aparecido Panagio, Italmar Teodorico Navarro, Juliano Bordignon, Ivete Conchon-Costa, Wander Rogerio Pavanelli, Ricardo Sergio Almeida, Idessania Nazareth Costa
The conventional treatment for toxoplasmosis with pyrimethamine and sulfadiazine shows toxic effects to the host, and it is therefore necessary to search for new drugs. Some studies suggest the use of statins, which inhibit cholesterol synthesis in humans and also the initial processes of isoprenoid biosynthesis in the parasite. Thus, the objective of this study was to evaluate the activity of the statins pravastatin and simvastatin in HeLa cells infected in vitro with the RH strain of T. gondii. HeLa cells (1×10(5)) were infected with T...
December 21, 2016: Acta Tropica
https://www.readbyqxmd.com/read/27999640/toxoplasmosis-in-iran-a-guide-for-general-physicians-working-in-the-iranian-health-network-setting-a-systematic-review
#18
REVIEW
Seyed Mohammad Alavi, Leila Alavi
BACKGROUND: Human toxoplasmosis is an important zoonotic infection worldwide which is caused by the intracellular parasite Toxoplasma gondii (T.gondii). The aim of this study was to review briefly the general aspects of toxoplasma infection in in Iranian health system network. METHODS: We searched published toxoplasmosis related articles in English databases including Science Direct, Pub Med, Scopus, Google Scholar, Magiran, Iran Medex, Iran Doc and Scientific Information Database (SID) for toxoplasmosis...
2016: Caspian Journal of Internal Medicine
https://www.readbyqxmd.com/read/27994750/discovery-of-potent-and-selective-leads-against-toxoplasma-gondii-dihydrofolate-reductase-via-structure-based-design
#19
Matthew E Welsch, Jian Zhou, Yueqiang Gao, Yunqing Yan, Gene Porter, Gautam Agnihotri, Yingjie Li, Henry Lu, Zhongguo Chen, Stephen B Thomas
Current treatment of toxoplasmosis targets the parasite's folate metabolism through inhibition of dihydrofolate reductase (DHFR). The most widely used DHFR antagonist, pyrimethamine, was introduced over 60 years ago and is associated with toxicity that can be largely attributed to a similar affinity for parasite and human DHFR. Computational analysis of biochemical differences between Toxoplasma gondii and human DHFR enabled the design of inhibitors with both improved potency and selectivity. The approach described herein yielded TRC-19, a promising lead with an IC50 of 9 nM and 89-fold selectivity in favor of Toxoplasma gondii DHFR, as well as crystallographic data to substantiate in silico methodology...
December 8, 2016: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27988201/early-detection-of-toxoplasma-gondii-infection-by-using-a-interferon-gamma-release-assay-a-review
#20
REVIEW
Shima Mahmoudi, Setareh Mamishi, Xun Suo, Hossein Keshavarz
Antibody-based serological tests are currently the most common diagnostic methods for detection of Toxoplasma gondii; however, these tests bear several limitations. Recently, Interferon-gamma release assay (IGRA), a T-cell-based test, was introduced as an in vitro test for detection of T. gondii infection. Few studies have investigated the potential role of cell immunity in diagnosis of toxoplasmosis. IGRA accurately distinguished infected from uninfected individuals, showing strong lymphocyte activation after in vitro stimulation with T...
December 14, 2016: Experimental Parasitology
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