520 results match your criteria: "Institute of Tropical Medicine NEKKEN[Affiliation]"

Transient transfection of Babesia ovis using heterologous promoters.

Ticks Tick Borne Dis

October 2019

Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa (IHMT-UNL), R. da Junqueira 100, 1349-008, Lisboa, Portugal; Global Health and Tropical Medicine, Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa (GHTM-IHMT-UNL), Rua da Junqueira, 100, 1349-008, Portugal.

Babesia species, etiological agents of babesiosis, a recognized emerging tick-borne disease, are a significant animal and human health concern with a worldwide socio-economic impact. The development of genetic manipulation techniques, such as transfection technology, is pivotal to improve knowledge regarding the biology of these poorly studied parasites towards better disease control strategies. For Babesia ovis, responsible for ovine babesiosis, a tick-borne disease of small ruminants, these tools are not yet available.

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Dengue remains a major public health problem in the Philippines. In this study, we determined the circulating dengue serotypes in the Philippines during the 2015-2017 outbreaks using a total of 678 serum samples from 537 individual dengue patients. Following an increase in the number of DENV-4 patients in recent years, we conducted a comprehensive molecular and epidemiology analysis on the DENV-4 strains isolated recently in the Philippines.

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Aim: Diuretics are a cornerstone in treatment of heart failure (HF). Torasemide is a loop diuretic with a potential advantage over other diuretics. We aim to meta-analyse and compare the effect of torasemide with furosemide in HF patients.

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Background: Amoebiasis, caused by Entamoeba histolytica infection, is a global public health problem. However, available drugs to treat amoebiasis are currently limited, and no effective vaccine exists. Therefore, development of new preventive measures against amoebiasis is urgently needed.

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Attenuated strains of avian Eimeria parasites, generated by the selection of precocious lines through serial passaging in chicks, have been used widely as live vaccines. Detailed morphological transitions including their life cycle depending on the passages remain poorly understood. Here, we showed early development and acceleration of transitions in morphological forms of the asexual schizonts of E.

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Background: The massive abundance of studies relating to tropical medicine and health has increased strikingly over the last few decades. In the field of tropical medicine and health, a well-conducted systematic review and meta-analysis (SR/MA) is considered a feasible solution for keeping clinicians abreast of current evidence-based medicine. Understanding of SR/MA steps is of paramount importance for its conduction.

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Genomic and biological features of Plasmodium falciparum resistance against antimalarial endoperoxide N-89.

Gene

October 2019

Division of International Infectious Diseases Control, Faculty of Pharmaceutical Sciences, Okayama University, Tsushima-Naka, Kita-Ku, Okayama 700-8530, Japan. Electronic address:

Article Synopsis
  • Drug resistance in malaria parasites hampers effective treatment and control, prompting research into an antimalarial compound, N-89, which has shown promising effects.
  • In this study, a N-89-resistant clone, NRC10H, was developed from the Plasmodium falciparum FCR-3 strain, and gene mutations were identified through whole-genome sequencing and real-time PCR.
  • Seven genes related to drug resistance showed mutations in NRC10H, with the specific variant A532S in the multidrug resistance protein 2 (mdr2) being unique to this clone, indicating it plays a role in the resistance mechanism against N-89.
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Background: The quality of systematic reviews and meta-analyses (SR/MAs) depends on the extent of the methods used. We investigated the methodological steps used by authors of SR/MAs of clinical trials via an author survey.

Methods: We conducted an email-based cross-sectional study by contacting corresponding authors of SR/MAs that were published in 2015 and 2016 and retrieved through the PubMed database.

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Identification of Mitochondrial Malate: Quinone Oxidoreductase Inhibitors from the Pathogen Box.

Genes (Basel)

June 2019

Department of Biomedical Chemistry, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Article Synopsis
  • - Malaria poses a significant global health threat, particularly due to drug-resistant parasites, making the development of new treatments urgently needed.
  • - Researchers have identified a trifunctional enzyme, malate quinone oxidoreductase (MQO), in the malaria parasite's mitochondria as a promising target for new drugs.
  • - In a study screening 400 compounds, seven were found to effectively target MQO, with four showing promising anti-parasitic activity, indicating that MQO could be a viable focus for antimalarial drug development.
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Several vector-borne pathogens restrict livestock farming and have significant economic impact worldwide. In endemic areas livestock are exposed to different tick species carrying various pathogens which could result in co-infection with several tick-borne pathogens in a single host. Although the co-infection of and the interaction among pathogens are critical factors to determine the disease outcome, pathogen interactions in the vector and the host are poorly understood.

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This study investigated the role of childhood parental deprivation in the association between quality of life (QOL) and the Epstein-Barr virus (EBV) antibody titer, a marker of cellular immune functioning, using data from 734 adults living in seven communities in rural Fujian, China. Parental deprivation was defined if either of their parents had died, divorced, or left them for migratory work for more than 1 year before they turned (a) 16 years of age (childhood and adolescence), or (b) 3 years of age (early childhood). A mixed-effects regression analysis with a random effects model revealed that parental deprivation during early childhood was positively associated with the EBV antibody titer (coefficient = 0.

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Genome Editing of Using the CRISPR/Cas9 System.

mSphere

June 2019

Department of Protozoology, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan

, the most virulent causative agent of bovine babesiosis, is prevalent in tropical and subtropical regions of the world. Although the whole-genome sequence was released more than a decade ago, functional analysis of the genomics of this parasite is hampered by the limited breadth of genetic engineering tools. In this study, we implemented the clustered regularly interspaced short palindromic repeat (CRISPR)/Cas9 system for and demonstrated its potential for genome editing.

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Roles of YIGL sequence of Ebola virus VP40 on genome replication and particle production.

J Gen Virol

July 2019

National Research Center for the Control and Prevention of Infectious Diseases (CCPID), Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523, Japan.

Ebola virus (EBOV) VP40 is a major driving force of nascent virion production and a negative regulator of genome replication/transcription. Here, we showed that the YIGL sequence at the C-terminus of EBOV VP40 is important for virus-like particle (VLP) production and the regulation of genome replication/transcription. Accordingly, a mutation in the YIGL sequence caused defects in VLP production and genome replication/transcription.

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Schistosomiasis japonica is one of seven NTDs endemic in the Philippines that continues to threaten public health in the country. The causative agent, the blood fluke Schistosoma japonicum, uses an amphibious snail Oncomelania hupensis quadrasi which can harbor larval stages that multiply asexually, eventually producing the infective cercariae which are shed into the water. Contamination of freshwater bodies inhabited by the snail intermediate host occurs through release of human and animal feces containing S.

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A commentary on the medicinal use of marijuana.

Trop Med Health

May 2019

6Department of Clinical Product Development, Institute of Tropical Medicine (NEKKEN), Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523 Japan.

Background: Lately, the number of people using marijuana in the USA has dramatically increased. In 2018, many states have legalized marijuana use for both medical and recreational purposes, thus exploring the evidence behind medical marijuana use became essential. Muslim majority countries enforce rigorous rules as marijuana has been a long-debated issue due to the stigma associated with its use as a treatment.

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Bronchial asthma is one of the most common chronic inflammatory diseases. Complementary and alternative medicine is increasingly used for treating bronchial asthma. Ten electronic databases were searched to investigate whether honey alone or in combination with other ingredients can be considered as the potential treatment for bronchial asthma.

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Multiple charged amino acids of Plasmodium falciparum SURFIN N-terminal region are important for efficient export to the red blood cell.

Parasitol Int

August 2019

Leading Program, Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan; Department of Protozoology, Institute of Tropical Medicine (NEKKEN), Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan. Electronic address:

Plasmodium falciparum, an obligate intracellular protozoan parasite which causes the severe form of human malaria, exports numerous proteins to the infected red blood cell that are important for its survival and of severe pathological effect to its host. These proteins and their export mechanisms are candidates for drug and vaccine development, and among them is the Plasmodium SURFIN family of proteins. Previously we showed that the N-terminal region along with the sequence surrounding the transmembrane domain of SURFIN is essential for its export to Maurer's clefts in the red blood cell cytoplasm.

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In Kenya, communities residing along the shores and islands of Lake Victoria bear a substantial burden of schistosomiasis. Although there is a school-based deworming program in place, the transmission of varies even at a fine scale. Given the focal nature of schistosomes' transmission, we aim to identify areas with high intensity of infection in Mbita, Homabay County, western Kenya, for prioritized integrated control measures.

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Efficacy and resistance of different artemisinin-based combination therapies: a systematic review and network meta-analysis.

Parasitol Int

February 2020

Department of Immunogenetics, Institute of Tropical Medicine (NEKKEN), Leading Graduate School Program, Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto, Nagasaki, Japan. Electronic address:

Background: Malaria parasites have developed resistance to most of the known antimalarial drugs in clinical practice, with reports of artemisinin resistance emerging in South East Asia (SEA). We sort to find the status of artemisinin resistance and efficacy of different modalities of the current artemisinin-based combination therapies (ACTs).

Methods: We carried out a systematic search in 11 electronic databases to identify in vivo studies published between 2001 and 2017 that reported artemisinin resistance.

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This systematic review and meta-analysis aimed to study the efficacy and safety of chamomile for the treatment of state anxiety, generalized anxiety disorders (GADs), sleep quality, and insomnia in human. Eleven databases including PubMed, Science Direct, Cochrane Central, and Scopus were searched to retrieve relevant randomized control trials (RCTs), and 12 RCTs were included. Random effect meta-analysis was performed by meta package of R statistical software version 3.

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Nonsense mutation in causes normal-pressure hydrocephalus with ciliary abnormalities.

Neurology

May 2019

From the Departments of Neuropsychiatry (Y.M., N.Y., H.O.) and Otolaryngology-Head and Neck Surgery (C.S.), Unit of Translation Medicine, and Department of Human Genetics (S.Y., A.K., H.M., K.-i.Y., S.O.), Nagasaki University Graduate School of Biomedical Sciences; Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute (K.M., M.N.), Central Laboratory, Institute of Tropical Medicine (NEKKEN) (M.S.), and Gene Research Center, Center for Frontier Life Sciences (T.K.), Nagasaki University; Department of Infectious Diseases (T.T.) and Child and Adolescent Psychiatry Community Partnership Unit (A.I.), Nagasaki University Hospital; Department of Cell Pathology (Y.K.), Graduate School of Medical Sciences, Kumamoto University; and Department of Clinical Psychology, Faculty of Medicine (N.K.), Kagawa University, Takamatsu, Japan.

Objective: To identify genes related to normal-pressure hydrocephalus (NPH) in one Japanese family with several members with NPH.

Methods: We performed whole-exome sequencing (WES) on a Japanese family with multiple individuals with NPH and identified a candidate gene. Then we generated knockout mouse using CRISPR/Cas9 to confirm the effect of the candidate gene on the pathogenesis of hydrocephalus.

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NT-proBNP incorporated in prediction rule of major peri-operative adverse cardiac event in non-cardiac surgery.

Surgeon

June 2019

Evidence Based Medicine Research Group, Ton Duc Thang University, Ho Chi Minh City, 70000, Viet Nam; Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, 70000, Viet Nam; Department of Clinical Product Development, Institute of Tropical Medicine (NEKKEN), School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki 852-8523, Japan. Electronic address:

Background: Patients undergoing non-cardiac surgery are at risk for peri-operative major cardiac events (PMCEs). The most common risk assessment tool is Revised Cardiac Risk Index (RCRI). N-terminal pro-brain natriuretic peptide (NT-proBNP) measured peri-operatively has prognostic information but the implication is uncertain.

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Reporting quality in systematic reviews of studies: a systematic review.

Curr Med Res Opin

September 2019

Evidence Based Medicine Research Group & Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam.

Systematic reviews (SRs) and/or meta-analyses of research have an important role in establishing the foundation for clinical studies. In this study, we aimed to evaluate the reporting quality of SRs of studies using the PRISMA checklist. Four databases were searched including PubMed, Virtual Health Library (VHL), Web of Science (ISI) and Scopus.

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Background: A significant reduction in malaria cases over the recent years in Nepal has encouraged the government to adopt a goal of "malaria-free nation by 2025." Nevertheless, to achieve this goal, it is critical to identify the epidemiological burden of malaria by specific regions and areas for an effective targeted intervention. The main objective of this study was to estimate the risk of malaria at Village Development Committee (VDC) level in Nepal based on disease, vector, parasite, and geography.

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