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https://www.readbyqxmd.com/read/27931200/amoebic-liver-abscess-an-unusual-cause-for-a-right-iliac-fossa-mass-a-case-report
#1
Vithiya Ratnasamy, Kumanan Thirunavukarasu, Kannathasan Selvam, Murugananthan Arumugam
BACKGROUND: Amoebic liver abscess is the most common extra intestinal manifestation of amoebiasis in tropical countries. It usually presents with right hypochondrial pain, fever and anorexia. Amoebic liver abscess has gained clinical significance due to the wide variety of clinical presentations which can cause diagnostic dilemmas and high mortality in untreated cases. CASE PRESENTATION: We report a case of a 63-year-old male with a history of anorexia for 3 weeks, fever for 4 days and examination findings of tender hepatomegaly with a liver span of 15 cm in the mid clavicular line and a firm irregular mass in the right iliac fossa...
December 8, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27930733/phosphorylation-of-eukaryotic-initiation-factor-2%C3%AE-during-stress-and-encystation-in-entamoeba-species
#2
Holland M Hendrick, Brenda H Welter, Matthew A Hapstack, Steven E Sykes, William J Sullivan, Lesly A Temesvari
Entamoeba histolytica is an enteric pathogen responsible for amoebic dysentery and liver abscess. It alternates between the host-restricted trophozoite form and the infective environmentally-stable cyst stage. Throughout its lifecycle E. histolytica experiences stress, in part, from host immune pressure. Conversion to cysts is presumed to be a stress-response. In other systems, stress induces phosphorylation of a serine residue on eukaryotic translation initiation factor-2α (eIF2α). This inhibits eIF2α activity resulting in a general decline in protein synthesis...
December 8, 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27930683/deep-insight-into-the-phosphatomes-of-parasitic-protozoa-and-a-web-resource-protozphosdb
#3
Tamanna Anwar, Samudrala Gourinath
Phosphorylation dynamically regulates the function of proteins by maintaining a balance between protein kinase and phosphatase activity. A comprehensive understanding of the role phosphatases in cellular signaling is lacking in case of protozoans of medical and veterinary importance worldwide. The drugs used to treat protozoal diseases have many undesired effects and the development of resistance, highlights the need for new effective and safer antiprotozoal agents. In the present study we have analyzed phosphatomes of 15 protozoans of medical significance...
2016: PloS One
https://www.readbyqxmd.com/read/27930312/metal-dependence-and-branched-rna-cocrystal-structures-of-the-rna-lariat-debranching-enzyme-dbr1
#4
Nathaniel E Clark, Adam Katolik, Kenneth M Roberts, Alexander B Taylor, Stephen P Holloway, Jonathan P Schuermann, Eric J Montemayor, Scott W Stevens, Paul F Fitzpatrick, Masad J Damha, P John Hart
Intron lariats are circular, branched RNAs (bRNAs) produced during pre-mRNA splicing. Their unusual chemical and topological properties arise from branch-point nucleotides harboring vicinal 2',5'- and 3',5'-phosphodiester linkages. The 2',5'-bonds must be hydrolyzed by the RNA debranching enzyme Dbr1 before spliced introns can be degraded or processed into small nucleolar RNA and microRNA derived from intronic RNA. Here, we measure the activity of Dbr1 from Entamoeba histolytica by using a synthetic, dark-quenched bRNA substrate that fluoresces upon hydrolysis...
December 6, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27923058/effect-of-mass-stool-examination-and-mass-treatment-for-decreasing-intestinal-helminth-and-protozoan-infection-rates-in-bolivian-children-a-cross-sectional-study
#5
Takao Asai, Claudia Còrdova Vidal, Wilma Strauss, Toshikazu Ikoma, Kazuo Endoh, Masaharu Yamamoto
Bolivia is one of the countries with a high intestinal helminth and protozoan infection rate. Despite the high prevalence of the parasitic infection, nationwide preventive measures for Bolivian children have not yet been implemented. We evaluated the effect of mass stool examination and treatment as a strategy for decreasing the infection rate. This study was conducted between 2013 and 2015 in children aged 2-18 years. A total of 2,033 stool samples (575 in 2013, 815 in 2014 and 642 in 2015) were collected and examined using the formalin-ether medical sedimentation method...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27912173/improved-anticancer-and-antiparasitic-activity-of-new-lawsone-mannich-bases
#6
Katharina Mahal, Aamir Ahmad, Florian Schmitt, Julia Lockhauserbäumer, Kathrin Starz, Rohan Pradhan, Subhash Padhye, Fazlul H Sarkar, Waleed S Koko, Rainer Schobert, Klaus Ersfeld, Bernhard Biersack
Substituted lawsone Mannich bases 2a-e, 3a-e and 4a-e were prepared and tested for their biological activities. The new fatty alkyl substituted compounds 2a-c exhibited strong and selective growth inhibitory activities in the low one-digit micromolar and sub-micromolar range against a panel of human cancer cell lines associated with ROS formation. In addition, compounds 2a-c revealed sub-micromolar anti-trypanosomal activities against parasitic Trypanosoma brucei brucei cells via deformation of the microtubule cytoskeleton...
November 22, 2016: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27905282/distribution-of-parasites-detected-in-stool-samples-of-patients-admitted-to-our-parasitology-laboratory-during-a-three-year-period-between-2012-and-2014
#7
Mehmet Burak Selek, Bayhan Bektöre, Ergenekon Karagöz, Orhan Baylan, Mustafa Özyurt
OBJECTIVE: Parasitic diseases are among the major public health issues worldwide. A number of tests are available for diagnosis, but the sentivity and specifity of these tests are assumed to be insufficient. Nevertheless, the most common diagnostic method is microscopic examination. In this study, we aimed to introduce the distribution of parasites detected in stool samples of patients admitted to our laboratory on the basis of parameters such as, age, and gender during a 3-year period between 2012 and 2014...
September 2016: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/27902886/lateral-gene-transfer-of-p-cresol-and-indole-producing-enzymes-from-environmental-bacteria-to-mastigamoeba-balamuthi
#8
Eva Nývltová, Robert Šuťák, Vojtěch Žárský, Karel Harant, Ivan Hrdý, Jan Tachezy
p-Cresol and indole are volatile biologically active products of the bacterial degradation of tyrosine and tryptophan, respectively. They are typically produced by bacteria in animal intestines, soil and various sediments. Here, we demonstrate that the free-living eukaryote Mastigamoeba balamuthi and its pathogenic relative Entamoeba histolytica produce significant amounts of indole via tryptophanase activity. Unexpectedly, M. balamuthi also produces p-cresol in concentrations that are bacteriostatic to non-p-cresol-producing bacteria...
November 30, 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27895543/proteome-analysis-of-excretory-secretory-proteins-of-entamoeba-histolytica-hm1-imss-via-lc-esi-ms-ms-and-lc-maldi-tof-tof
#9
Jorim Anak Ujang, Soon Hong Kwan, Mohd Nazri Ismail, Boon Huat Lim, Rahmah Noordin, Nurulhasanah Othman
BACKGROUND: Excretory-secretory (ES) proteins of E. histolytica are thought to play important roles in the host invasion, metabolism, and defence. Elucidation of the types and functions of E. histolytica ES proteins can further our understanding of the disease pathogenesis. Thus, the aim of this study is to use proteomics approach to better understand the complex ES proteins of the protozoa. METHODS: E. histolytica ES proteins were prepared by culturing the trophozoites in protein-free medium...
2016: Clinical Proteomics
https://www.readbyqxmd.com/read/27894878/functionally-conserved-rna-binding-and-protein-protein-interaction-properties-of-line-orf1p-in-an-ancient-clade-of-non-ltr-retrotransposons-of-entamoeba-histolytica
#10
Amit Kumar Gaurav, Jitender Kumar, Mridula Agrahari, Alok Bhattacharya, Vijay Pal Yadav, Sudha Bhattacharya
Retrotransposons are mobile genetic elements found in most organisms. Their origin and evolution is not very well understood. Retrotransposons that lack long terminal repeats (non-LTR) have been classified based on their reverse transcriptase (RT) and endonuclease sequences into groups, of which R2 is the most ancient. Its members contain a single open reading frame (ORF) while there are two ORFs in the other groups, of which ORF2 contains the RT and endonuclease sequences. It is thought that ORF1 was added later to the single-ORF-containing elements, and codes for a protein with nucleic acid binding activity...
November 25, 2016: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/27890948/study-of-infections-among-human-immunodeficiency-virus-acquired-immunodeficiency-syndrome-patients-in-shadan-hospital-telangana-india
#11
Sukumar Gajjala Reddy, Syed Yousuf Ali, Azheel Khalidi
BACKGROUND: Human immunodeficiency virus (HIV) pandemicity is a major concern today as it causes greater loss of productivity than any other disease. HIV infection leads to profound immune deficiency and patients become highly susceptible to opportunistic infections (OIs). HIV epidemic in India is heterogeneous in nature, both in terms of routes of transmission as well as geographical spread. AIMS: (1) Determine prevalence of OIs among HIV-seropositive patients and their relation to CD4 count and to focus on the routes of transmission...
July 2016: Indian Journal of Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27884121/prevalence-and-risk-factors-of-intestinal-protozoan-infections-a-population-based-study-in-rural-areas-of-boyer-ahmad-district-southwestern-iran
#12
Bahador Sarkari, Ghasem Hosseini, Mohammad Hossein Motazedian, Mohammad Fararouei, Abdolali Moshfe
BACKGROUND: Parasitic infections are still a significant health problem in rural areas in developing countries including Iran. There is no recent population-based data about the prevalence of human intestinal parasites in most rural areas of Iran. The current study aimed to determine the prevalence of intestinal protozoan infection in inhabitants of rural areas of Boyer-Ahmad district, Southwestern Iran. METHODS: A total of 1025 stool samples were collected from the inhabitant of 50 randomly selected villages in Boyer-Ahmad Township...
November 25, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27876112/antioxidant-defense-of-nrf2-vs-pro-inflammatory-system-of-nf-%C3%AE%C2%BAb-during-the-amoebic-liver-infection-in-hamster
#13
Liseth R Aldaba-Muruato, Martin H Muñoz-Ortega, María Del R Campos-Esparza, José R Macías-Pérez, Nayeli A Márquez-Muñoz, Ana G Villalobos-Santos, Javier Ventura-Juárez
Entamoeba histolytica is the causative agent of amoebic liver abscess (ALA), which course with an uncontrolled inflammation and nitro-oxidative stresses, although it is well known that amoeba has an effective defence mechanisms against this toxic environment, the underlying molecular factors responsible for progression of tissue damage remain largely unknown. The purpose of the present study was to determine during the acute stage of ALA in hamsters, the involvement of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) and nuclear factor-kappa B (NF-κB), which are activated in response to oxidative stress...
November 23, 2016: Parasitology
https://www.readbyqxmd.com/read/27871871/paleoparasitological-analysis-of-the-extinct-myotragus-balearicus-bate-1909-artiodactyla-caprinae-from-mallorca-balearic-islands-western-mediterranean
#14
Victor Hugo Borba Nunes, Josep Antoni Alcover, Valmir Laurentino Silva, Paula Borba Cruz, José Roberto Machado-Silva, Adauto José Gonçalves de Araújo
Myotragus balearicus (Artiodactyla, Caprinae) is an extinct caprine endemic of the Eastern Balearic Islands or Gymnesics (i.e., Mallorca, Menorca and surrounding islets, Western Mediterranean Sea). In spite of its small size, c. 50cm height at the shoulder, it was the largest mammal inhabiting these islands until the human arrival, and it had peculiar short legs and frontal vision. It disappeared between 2830 and 2210calBCE. The coprolites here studied were recovered from Cova Estreta, in Pollença, Mallorca...
November 18, 2016: Parasitology International
https://www.readbyqxmd.com/read/27861635/multiplex-real-time-pcr-assay-targeting-eight-parasites-customized-to-the-korean-population-potential-use-for-detection-in-diarrheal-stool-samples-from-gastroenteritis-patients
#15
Eun Jeong Won, Soo Hyun Kim, Seung Jung Kee, Jong Hee Shin, Soon Pal Suh, Jong Yil Chai, Dong Wook Ryang, Myung Geun Shin
Intestinal parasitic diseases occur worldwide and can cause diarrhea or gastroenteritis; however, their diagnosis is quite difficult, especially in low-endemism countries. We developed a multiplex real-time PCR assay for detection of eight intestinal parasites and prospectively evaluated it for patients with gastroenteritis. The assay targeted Cryptosporidium parvum, Giardia lamblia, Entamoeba histolytica, Blastocystis hominis, Dientamoeba fragilis, Clonorchis sinensis, Metagonimus yokogawai, and Gymnophalloides seoi...
2016: PloS One
https://www.readbyqxmd.com/read/27853522/recent-advances-in-entamoeba-biology-rna-interference-drug-discovery-and-gut-microbiome
#16
REVIEW
Pedro Morgado, Dipak Manna, Upinder Singh
In recent years, substantial progress has been made in understanding the molecular and cell biology of the human parasite Entamoeba histolytica, an important pathogen with significant global impact. This review outlines some recent advances in the Entamoeba field in the last five years, focusing on areas that have not recently been discussed in detail: (i) molecular mechanisms regulating parasite gene expression, (ii) new efforts at drug discovery using high-throughput drug screens, and (iii) the effect of gut microbiota on amoebiasis...
2016: F1000Research
https://www.readbyqxmd.com/read/27847377/underestimated-amoebic-appendicitis-among-hiv-1-infected-individuals-in-japan
#17
Taiichiro Kobayashi, Koji Watanabe, Hideaki Yano, Yukinori Murata, Toru Igari, Kumiko Nakada-Tsukui, Kenji Yagita, Tomoyoshi Nozaki, Mitsuo Kaku, Kunihisa Tsukada, Hiroyuki Gatanaga, Yoshimi Kikuchi, Shinichi Oka
Entamoeba histolytica is not a common causative agent of acute appendicitis. However, amoebic appendicitis could sometimes be severe and life-threatening, mainly due to lack of awareness. Also, its frequency, clinical features and pathogenesis remain unclear. The study subjects were HIV-1-infected individuals who presented with acute appendicitis and later underwent appendectomy at our hospital between 1996 and 2014. Formalin-fixed paraffin-embedded preserved appendix specimens were re-examined by Periodic acid-Schiff (PAS) staining and PCR to identify undiagnosed amoebic appendicitis...
November 9, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27821451/phase-i-clinical-trial-results-of-auranofin-a-novel-antiparasitic-agent
#18
Edmund V Capparelli, Robin Bricker-Ford, M John Rogers, James H McKerrow, Sharon L Reed
Under an NIH priority to identify new drugs to treat Class B parasitic agents, we performed high throughput screens, which identified Auranofin's (Ridaura™) activity against Entamoeba histolytica and Giardia intestinalis, major causes of water- and food-borne outbreaks. Auranofin, an oral, gold-containing compound FDA approved in 1985 for rheumatoid arthritis, was effective in vitro and in vivo against E histolytica and both metronidazole-sensitive and resistant strains of Giardia We now report the results of an NIH sponsored Phase I trial to characterize the PK and safety of auranofin in healthy volunteers using modern techniques to measure gold levels...
November 7, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27808157/n-acetyl-ornithine-deacetylase-is-a-moonlighting-protein-and-is-involved-in-the-adaptation-of-entamoeba-histolytica-to-nitrosative-stress
#19
Preeti Shahi, Meirav Trebicz-Geffen, Shruti Nagaraja, Rivka Hertz, Sharon Alterzon-Baumel, Karen Methling, Michael Lalk, Mohit Mazumder, Gourinath Samudrala, Serge Ankri
Adaptation of the Entamoeba histolytica parasite to toxic levels of nitric oxide (NO) that are produced by phagocytes may be essential for the establishment of chronic amebiasis and the parasite's survival in its host. In order to obtain insight into the mechanism of E. histolytica's adaptation to NO, E. histolytica trophozoites were progressively adapted to increasing concentrations of the NO donor drug, S-nitrosoglutathione (GSNO) up to a concentration of 110 μM. The transcriptome of NO adapted trophozoites (NAT) was investigated by RNA sequencing (RNA-seq)...
November 3, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27806046/migrant-workers-in-malaysia-current-implications-of-sociodemographic-and-environmental-characteristics-in-the-transmission-of-intestinal-parasitic-infections
#20
Norhidayu Sahimin, Yvonne A L Lim, Farnaza Ariffin, Jerzy M Behnke, John W Lewis, Siti Nursheena Mohd Zain
A cross-sectional study of intestinal parasitic infections amongst migrant workers in Malaysia was conducted. A total of 388 workers were recruited from five sectors including manufacturing, construction, plantation, domestic and food services. The majority were recruited from Indonesia (n = 167, 43.3%), followed by Nepal (n = 81, 20.9%), Bangladesh (n = 70, 18%), India (n = 47, 12.1%) and Myanmar (n = 23, 5.9.2%). A total of four nematode species (Ascaris lumbricoides, Trichuris trichiura, Enterobius vermicularis and hookworms), one cestode (Hymenolepis nana) and three protozoan species (Entamoeba histolytica/dispar, Giardia sp...
November 2016: PLoS Neglected Tropical Diseases
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