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Tukwarlba I, Aninagyei E, Mavis PD, Attoh J, Duedu KO, Kumi J, Ampem-Danso E, Acheampong DO. Point-of-care circulating cathodic antigen positivity and associated factors in school children one year after mass praziquantel administration in an endemic district in Ghana. Heliyon 2024; 10:e28529. [PMID: 38596068 PMCID: PMC11002594 DOI: 10.1016/j.heliyon.2024.e28529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 03/11/2024] [Accepted: 03/20/2024] [Indexed: 04/11/2024] Open
Abstract
Background Mass drug administration of praziquantel is expected to reduce Schistosome carriage in treated children in endemic communities. However, the effectiveness of this annual exercise has not been assessed in Ghana. Therefore, this study aimed to detect viable Schistosoma mansoni infection using point-of-care circulating cathodic antigen (POC-CCA) positivity as proxy and associated factors in children previously treated with praziquantel in an endemic municipality in Ghana. Materials and methods This cross-sectional study was done in the Assin Central municipality in the Central Region of Ghana. School children, less than 16 years of age, treated with 40 mg/kg of praziquantel (treatment period: February-March 2019), provided early morning urine (∼40 mL) and stool (∼4 g) samples. Immediately, POC-CCA (ICT International, South Africa) was done, while S. mansoni ova were detected in formalin fixed samples using microscopy later. Additionally, participant's socio-demographic information and factors associated with S, mansoni infection transmission were collected from each child. Results A total of 520 children participated in the study (males-51.9%, majority age range [9-11 years, 34.4%]). Overall, 244 (46.9%) were positive for urinary CCA with no S. mansoni detected by microscopy. POC-CCA positivity was higher in females (48.4%), children with 2-3 siblings (49.3%), children aged 6-8-year range (55.4%) and residents of Brofoyedur (52%). However, age (x2 = 16.1, p = 0.0003) and town of residence (x2 = 11.7, p = 0.019) associated with CCA positivity. Further, location of water body (x2 = 16.4, p = 0.008), frequency of water contact (x2 = 12.3, p = 0.015) and handling of the Biomphalaria intermediate host (x2 = 5.1, p = 0.024) associated with POC-CCA outcome. Conclusion About 47% of the school children were positive for CCA, one year after mass praziquantel administration in the Assin Central municipality. Varied factors associated with the post-praziquantel administration POC-CCA positivity. This study should be replicated in other endemic areas to identify groups at risk of parasite persistence or reinfection to inform modification of control and preventive measures.
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Affiliation(s)
- Isaac Tukwarlba
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Enoch Aninagyei
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Volta Region, Ghana
| | - Puopelle Dakorah Mavis
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Juliana Attoh
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Kwabena Obeng Duedu
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Volta Region, Ghana
- College of Life Sciences, Birmingham City University, City South Campus, Birmingham, United Kingdom
| | - Justice Kumi
- Department of Clinical Pathology, Noguchi Memorial Institute for Medical Research, University of Ghana Legon, Accra, Ghana
| | - Eunice Ampem-Danso
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
- Department of Clinical Pathology, Noguchi Memorial Institute for Medical Research, University of Ghana Legon, Accra, Ghana
| | - Desmond Omane Acheampong
- Department of Biomedical Sciences, School of Allied Health Sciences, University of Cape Coast, Cape Coast, Ghana
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Oliosi E, Angoulvant A, Marteau A, Paris L, Bouchaud O, Guegan H, Choinier P, Tattevin P, Gangneux JP, Delobre G, Houzé S, Jauréguiberry S. Chronic schistosomiasis imported in France: A retrospective multicentre analysis of 532 patients, calling for international recommendations. Travel Med Infect Dis 2023; 56:102644. [PMID: 37820948 DOI: 10.1016/j.tmaid.2023.102644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 09/02/2023] [Accepted: 09/25/2023] [Indexed: 10/13/2023]
Abstract
BACKGROUND Schistosomiasis is a major public health issue for migrants. This study aims to describe the clinical presentation and management of imported schistosomiasis in France. METHODS We included all new cases of schistosomiasis in patients aged ≥18 years, defined by a positive specific Western blot and/or a positive parasitological analysis of urine, stool or biopsy, between January 1, 2016, and December 31, 2019, in 4 laboratories in Paris and Western France. RESULTS Over the study period, 532 patients were included. Mean age was 37 years (18-91), and 461/532 (87 %) were men. Among 476/532 (89 %) patients born in an endemic area, 433 (91 %) were born in sub-Saharan Africa. Most of the patients (405/532, 76 %) had only a positive serology, and 127/532 (24 %) had ova on microscopic examination. Among 361/532 (68 %) who had at least one urine, stool or biopsy analysis, microscopic analysis was positive in 127 (35 %). Imaging showed lesions compatible with schistosomiasis in 88/164 (54 %) patients with clinical symptoms and 13/29 (45 %) patients without (p = 0.5). Patients who arrived in France less than one year before diagnosis were more likely to have clinical symptoms than those who arrived in France 1-5 years and >5 years prior to diagnosis (52 %, 41 % and 43 %, respectively, p = 0.03). Two-hundred and seventeen patients (40.8 %) were left untreated. CONCLUSION Approximately 50 % of patients with imported chronic schistosomiasis have radiological abnormalities, whether they are symptomatic or not, and management is heterogeneous. Multidisciplinary international guidelines are requested to clarify the management of this neglected disease.
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Affiliation(s)
- Emma Oliosi
- Université Paris-Saclay, Service des Maladies Infectieuses et Tropicales, AP-HP, Hôpital Bicêtre, Le Kremlin Bicêtre, 94270, France.
| | - Adela Angoulvant
- Université Paris-Saclay, Laboratoire de Parasitologie-mycologie, AP-HP, Hôpital Bicêtre, Le Kremlin Bicêtre, 94270, France
| | - Anthony Marteau
- Université Sorbonne Paris Nord, Service de Parasitologie-Mycologie, AP-HP, Hôpital Avicenne, Bobigny, 93000, France
| | - Luc Paris
- Sorbonne Université, Service de Parasitologie-Mycologie, AP-HP, Hôpital Pitié-Salpêtrière, Paris, 75013, France
| | - Olivier Bouchaud
- Université Sorbonne Paris Nord, Service des Maladies Infectieuses et Tropicales, AP-HP, Hôpital Avicenne, Bobigny, 93000, France
| | - Hélène Guegan
- Université Rennes, CHU de Rennes, Inserm, Irset (Institut de Recherche en Santé, Environnement et Travail) UMR_S 1085, Rennes, 35000, France
| | - Pascaline Choinier
- Sorbonne Université, Service de Pneumologie, AP-HP, Hôpital Tenon, Paris, 75020, France
| | - Pierre Tattevin
- Université Rennes 1, Service des Maladies Infectieuses et Tropicales, Hôpital Pontchaillou, Rennes, 35000, France
| | - Jean-Pierre Gangneux
- Université Rennes, CHU de Rennes, Inserm, Irset (Institut de Recherche en Santé, Environnement et Travail) UMR_S 1085, Rennes, 35000, France
| | | | - Sandrine Houzé
- Université Paris-Cité, Laboratoire de Parasitologie-Mycologie, AP-HP, Hôpital Bichat-Claude Bernard, Paris, 75018, France
| | - Stéphane Jauréguiberry
- Université Paris-Saclay, Service des Maladies Infectieuses et Tropicales, AP-HP, Hôpital Bicêtre, Le Kremlin Bicêtre, 94270, France; Société Française de Médecine des Voyages, France.
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3
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Manciulli T, Marangoni D, Salas-Coronas J, Bocanegra C, Richter J, Gobbi F, Motta L, Minervini A, Bartoloni A, Zammarchi L. Diagnosis and management of complicated urogenital schistosomiasis: a systematic review of the literature. Infection 2023; 51:1185-1221. [PMID: 37466786 PMCID: PMC10545601 DOI: 10.1007/s15010-023-02060-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 05/31/2023] [Indexed: 07/20/2023]
Abstract
BACKGROUND Currently, there are no standardized guidelines for the diagnosis or management of the complications of urogenital schistosomiasis (UGS). This systematic review of the literature aims to investigate the state of the art in reference to diagnostic approaches and the clinical management of this condition. METHODS A systematic review of literature published between January 1990 and January 2021 was conducted in the MEDLINE database, scoping for articles regarding diagnostic means or therapeutic options for the complications of UGS, namely obstructive uropathy, bladder cancer, abortion, ectopic pregnancy, infertility, kidney failure, urolithiasis and the need for invasive procedures. Relevant data were then extracted from the articles deemed eligible according to the inclusion criteria. MAIN RESULTS In total, 3052 articles were identified by the research query, of which 167 articles fulfilling inclusion criteria after title/abstract screening and full-text evaluation were included, 35% on both diagnostic and therapeutic aspects, and 51% on diagnosis and 14% on therapy. Ultrasound was the most frequently tool employed for the diagnosis of UGS complications showing a good performance. Concerning the management of hydronephrosis, the majority of available evidences came from community-based studies where universal treatment with praziquantel was used leading to decrease of prevalence of obstructive uropathy. Concerning studies on surgical procedures, laser endoureterotomy followed by stenting was mostly employed in adult patients leading to a crude cure rate of 60% (43 of 71 patients). In the case of severe hydronephrosis, surgery consisting of ureteral re-implantation showed excellent results with a crude cure rate of 98% (157 cured patients of 160 treated). Concerning bladder cancer, data on 93 patients with a clear diagnosis of UGS-related bladder were available reporting a variable and sometime combined approach based on disease stage. Available data on diagnosis and management of abortion, ectopic pregnancy, infertility, kidney failure, urolithiasis and the need for invasive procedures due to UGS are also presented. CONCLUSIONS The review produced a complete picture of the diagnostic and therapeutic options currently available for complicated UGS. These results can be useful both for guiding clinicians towards correct management and for tracing the direction of future research.
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Affiliation(s)
- Tommaso Manciulli
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Davide Marangoni
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | | | - Cristina Bocanegra
- Tropical Medicine and International Health Unit Vall d'Hebron-Drassanes, Infectious Diseases Department, Vall d'Hebron University Hospital, PROSICS Barcelona, Barcelona, Spain
| | - Joachim Richter
- Institute of Tropical Medicine and International Health, Charité Universitätsmedizin, Corporate Member of Free University and Humboldt University Berlin and Berlin Health Institute, Berlin, Germany
| | - Federico Gobbi
- Infectious-Tropical Diseases and Microbiology Department, IRCCS Ospedale Sacro Cuore Don Calabria, Negrar di Valpolicella, Verona, Italy
| | - Leonardo Motta
- Infectious-Tropical Diseases and Microbiology Department, IRCCS Ospedale Sacro Cuore Don Calabria, Negrar di Valpolicella, Verona, Italy
| | - Andrea Minervini
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
- Unit of Oncologic Minimally-Invasive Urology and Andrology, Azienda Ospedaliero Universitaria Careggi, Florence, Italy
| | - Alessandro Bartoloni
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
- Department of Infectious and Tropical Diseases, Azienda Ospedaliero Universitaria Careggi, Largo Giovanni Alessandro Brambilla, 3, 50134, Florence, Italy
| | - Lorenzo Zammarchi
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.
- Department of Infectious and Tropical Diseases, Azienda Ospedaliero Universitaria Careggi, Largo Giovanni Alessandro Brambilla, 3, 50134, Florence, Italy.
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Valli A, Achilonu I. Molecular dynamics-derived pharmacophores of Schistosoma glutathione transferase in complex with bromosulfophthalein: Screening and analysis of potential inhibitors. J Mol Graph Model 2023; 122:108457. [PMID: 37004419 DOI: 10.1016/j.jmgm.2023.108457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 02/27/2023] [Accepted: 03/16/2023] [Indexed: 03/28/2023]
Abstract
Schistosoma glutathione transferases (GSTs) have been identified as attractive drug targets for the design of novel antischistosomals. Here, we used in silico methods to validate the discriminative inhibitory properties of bromosulfophthalein (BSP) against the 26-kDa GST from S. japonicum (Sj26GST), and the 28-kDa GST from S. haematobium (Sh28GST), versus human GST (hGST) isoforms alpha (hGSTA), mu (hGSTM) and pi (hGSTP). The use of BSP as an archetypal selective inhibitor was harnessed to produce molecular dynamics-derived pharmacophores of the two targets. Pharmacophore-based screening using a large dataset of experimental and approved drug compounds was performed to produce a shortlist of candidates. The top candidate for each target was prioritised via molecular docking, yielding guanosine-3'-monophosphate-5'-diphosphate (G3D) for Sj26GST, and quercetin-3'-O-phosphate (Q3P) for Sh28GST. Comparative molecular dynamics studies of both candidates compared to BSP showed similar characteristics of binding stability and strength, suggesting their potential to emulate the inhibitory effects of BSP.
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Affiliation(s)
- Akeel Valli
- Protein Structure-Function Research Unit, School of Molecular and Cell Biology, Faculty of Science, University of the Witwatersrand, Johannesburg, 2050, South Africa
| | - Ikechukwu Achilonu
- Protein Structure-Function Research Unit, School of Molecular and Cell Biology, Faculty of Science, University of the Witwatersrand, Johannesburg, 2050, South Africa.
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Senghor B, Mathieu-Begné E, Rey O, Doucouré S, Sow D, Diop B, Sène M, Boissier J, Sokhna C. Urogenital schistosomiasis in three different water access in the Senegal river basin: prevalence and monitoring praziquantel efficacy and re-infection levels. BMC Infect Dis 2022; 22:968. [PMID: 36581796 PMCID: PMC9801593 DOI: 10.1186/s12879-022-07813-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 10/26/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Urogenital schistosomiasis is a neglected tropical disease most prevalent in sub-Saharan Africa. In the Senegal river basin, the construction of the Diama dam led to an increase and endemicity of schistosomiasis. Since 2009, praziquantel has frequently been used as preventive chemotherapy in the form of mass administration to Senegalese school-aged children without monitoring of the treatment efficacy and the prevalence after re-infection. This study aims to determine the current prevalence of urogenital schistosomiasis (caused by Schistosoma haematobium), the efficacy of praziquantel, and the re-infection rates in children from five villages with different water access. METHODS The baseline prevalence of S. haematobium was determined in August 2020 in 777 children between 5 and 11 years old and a single dose of praziquantel (40 mg/kg) was administered to those positive. The efficacy of praziquantel and the re-infection rates were monitored 4 weeks and 7 months after treatment, respectively, in 226 children with a high intensity of infection at baseline. RESULTS At the baseline, prevalence was low among children from the village of Mbane who live close to the Lac de Guiers (38%), moderate among those from the villages of Dioundou and Khodit, which neighbor the Doue river (46%), and very high at Khodit (90.6%) and Guia (91.2%) which mainly use an irrigation canal. After treatment, the observed cure rates confirmed the efficacy of praziquantel. The lowest cure rate (88.5%) was obtained in the village using the irrigation canal, while high cure rates were obtained in those using the lake (96.5%) and the river (98%). However, high egg reduction rates (between 96.7 and 99.7%) were obtained in all the villages. The re-infection was significantly higher in the village using the canal (42.5%) than in the villages accessing the Lac de Guiers (18.3%) and the Doue river (14.8%). CONCLUSION Praziquantel has an impact on reducing the prevalence and intensity of urogenital schistosomiasis. However, in the Senegal river basin, S. haematobium remains a real health problem for children living in the villages near the irrigation canals, despite regular treatment, while prevalence is declining from those frequenting the river and the Lac de Guiers. Trial registration ClinicalTrials.gov, NCT04635553. Registered 19 November 2020 retrospectively registered, https://www. CLINICALTRIALS gov/ct2/show/NCT04635553?cntry=SN&draw=2&rank=4.
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Affiliation(s)
- Bruno Senghor
- grid.418291.70000 0004 0456 337XCampus International IRD-UCAD de Hann, Vectors-Tropical and Mediterranean Infections (VITROME) Laboratory, 1386 Dakar, Senegal
| | - Eglantine Mathieu-Begné
- grid.121334.60000 0001 2097 0141Host Pathogen Environments Interactions (IHPE) Laboratory, CNRS, IFREMER, University of Montpellier, University of Perpignan via Domitia, Perpignan, France
| | - Olivier Rey
- grid.121334.60000 0001 2097 0141Host Pathogen Environments Interactions (IHPE) Laboratory, CNRS, IFREMER, University of Montpellier, University of Perpignan via Domitia, Perpignan, France
| | - Souleymane Doucouré
- grid.418291.70000 0004 0456 337XCampus International IRD-UCAD de Hann, Vectors-Tropical and Mediterranean Infections (VITROME) Laboratory, 1386 Dakar, Senegal
| | - Doudou Sow
- grid.442784.90000 0001 2295 6052Department of Parasitology-Mycology, UFR of Health Sciences, University Gaston Berger, 234, Saint-Louis, Senegal
| | - Bocar Diop
- grid.442784.90000 0001 2295 6052Laboratory of Biological and Agronomic Sciences and Modelling of Complex Systems, UFRS2ATA, Gaston Berger University of Saint-Louis, Saint-Louis, Senegal
| | - Mariama Sène
- National Schistosomiasis Control Program (NSCP), Ministry of Health, Dakar, Senegal
| | - Jérôme Boissier
- grid.121334.60000 0001 2097 0141Host Pathogen Environments Interactions (IHPE) Laboratory, CNRS, IFREMER, University of Montpellier, University of Perpignan via Domitia, Perpignan, France
| | - Cheikh Sokhna
- grid.418291.70000 0004 0456 337XCampus International IRD-UCAD de Hann, Vectors-Tropical and Mediterranean Infections (VITROME) Laboratory, 1386 Dakar, Senegal ,grid.5399.60000 0001 2176 4817VITROME, IRD, SSA, AP-HM, IHU-Mediterranean Infection, Aix-Marseille Univ, Marseille, France
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Efficacy of Praziquantel for the Treatment of Human Schistosomiasis in Ethiopia: A Systematic Review and Meta-Analysis. J Trop Med 2021; 2021:2625255. [PMID: 34966433 PMCID: PMC8712180 DOI: 10.1155/2021/2625255] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 12/04/2021] [Indexed: 01/02/2023] Open
Abstract
Background Schistosomiasis is one of the neglected tropical diseases causing a serious human health problem in Ethiopia. Praziquantel is the only drug that has been used for the treatment of human schistosomiasis in the country. In line with this, the efficacy of praziquantel has been evaluated in a few interventional studies in the country, but there is a lack in systematically gathered and analyzed information for policymakers. The aim of this systematic review and meta-analysis was to provide a summary of the efficacy of praziquantel for the treatment of human schistosomiasis in Ethiopia. Methods We conducted a literature search from ScienceDirect, PubMed/Medlin, and Google Scholar databases. A total of 140 articles published in English from 1980 to June 2021 were accessed and 15 of them were eligible for this meta-analysis. The meta-analysis was conducted using Stata 14 software, "metan command." The heterogeneities among studies were evaluated using I 2 test. Results A total of 140 articles were reviewed, but only 15 of them fulfilled the inclusion criteria. The polled cure rate of 40 mg/kg praziquantel was 89.2% (95% CI: 85.4-93.1) and 93.6% (95% CI: 80.6-106) among Schistosoma mansoni and S. haematobium, respectively. Similarly, the mean egg reduction rates of 40 mg/kg praziquantel were 90.2% and 85% among S. mansoni and S. haematobium infected subjects, respectively. The common adverse events observed after receiving praziquantel include abdominal pain, vomiting, headache, diarrhea, and bloody stool. Conclusion This systematic review and meta-analysis has indicated that praziquantel is still an appropriate drug for the treatment of human schistosomiasis in Ethiopia.
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Angeli A, Ferraroni M, Da'dara AA, Selleri S, Pinteala M, Carta F, Skelly PJ, Supuran CT. Structural Insights into Schistosoma mansoni Carbonic Anhydrase (SmCA) Inhibition by Selenoureido-Substituted Benzenesulfonamides. J Med Chem 2021; 64:10418-10428. [PMID: 34232641 DOI: 10.1021/acs.jmedchem.1c00840] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Tegumental carbonic anhydrase from the worm Schistosoma mansoni (SmCA) is considered a new anti-parasitic target because suppressing its expression interferes with schistosome metabolism and virulence. Here, we present the inhibition profiles of selenoureido compounds on recombinant SmCA and resolution of the first X-ray crystal structures of SmCA in adduct with a selection of such inhibitors. The key molecular features of such compounds in adduct with SmCA were obtained and compared to the human isoform hCA II, in order to understand the main structural factors responsible for enzymatic affinity and selectivity. Compounds that more specifically inhibited the schistosome versus human enzymes were identified. The results expand current knowledge in the field and pave the way for the development of more potent antiparasitic agents in the near future.
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Affiliation(s)
- Andrea Angeli
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, 50019 Florence, Italy.,Centre of Advanced Research in Bionanoconjugates and Biopolymers Department, "Petru Poni" Institute of Macromolecular Chemistry, 707410 Iasi, Romania
| | - Marta Ferraroni
- Dipartimento di Chimica "Ugo Schiff", University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Florence, Italy
| | - Akram A Da'dara
- Department of Infectious Disease and Global Health, Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts 01536, United States
| | - Silvia Selleri
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, 50019 Florence, Italy
| | - Mariana Pinteala
- Centre of Advanced Research in Bionanoconjugates and Biopolymers Department, "Petru Poni" Institute of Macromolecular Chemistry, 707410 Iasi, Romania
| | - Fabrizio Carta
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, 50019 Florence, Italy
| | - Patrick J Skelly
- Department of Infectious Disease and Global Health, Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts 01536, United States
| | - Claudiu T Supuran
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, 50019 Florence, Italy
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Mawa PA, Kincaid-Smith J, Tukahebwa EM, Webster JP, Wilson S. Schistosomiasis Morbidity Hotspots: Roles of the Human Host, the Parasite and Their Interface in the Development of Severe Morbidity. Front Immunol 2021; 12:635869. [PMID: 33790908 PMCID: PMC8005546 DOI: 10.3389/fimmu.2021.635869] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 02/25/2021] [Indexed: 12/14/2022] Open
Abstract
Schistosomiasis is the second most important human parasitic disease in terms of socioeconomic impact, causing great morbidity and mortality, predominantly across the African continent. For intestinal schistosomiasis, severe morbidity manifests as periportal fibrosis (PPF) in which large tracts of macro-fibrosis of the liver, visible by ultrasound, can occlude the main portal vein leading to portal hypertension (PHT), sequelae such as ascites and collateral vasculature, and ultimately fatalities. For urogenital schistosomiasis, severe morbidity manifests as pathology throughout the urinary system and genitals, and is a definitive cause of squamous cell bladder carcinoma. Preventative chemotherapy (PC) programmes, delivered through mass drug administration (MDA) of praziquantel (PZQ), have been at the forefront of schistosomiasis control programmes in sub-Saharan Africa since their commencement in Uganda in 2003. However, despite many successes, 'biological hotspots' (as distinct from 'operational hotspots') of both persistent high transmission and morbidity remain. In some areas, this failure to gain control of schistosomiasis has devastating consequences, with not only persistently high infection intensities, but both "subtle" and severe morbidity remaining prevalent. These hotspots highlight the requirement to revisit research into severe morbidity and its mechanisms, a topic that has been out of favor during times of PC implementation. Indeed, the focality and spatially-structured epidemiology of schistosomiasis, its transmission persistence and the morbidity induced, has long suggested that gene-environmental-interactions playing out at the host-parasite interface are crucial. Here we review evidence of potential unique parasite factors, host factors, and their gene-environmental interactions in terms of explaining differential morbidity profiles in the human host. We then take the situation of schistosomiasis mansoni within the Albertine region of Uganda as a case study in terms of elucidating the factors behind the severe morbidity observed and the avenues and directions for future research currently underway within a new research and clinical trial programme (FibroScHot).
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Affiliation(s)
- Patrice A. Mawa
- Immunomodulation and Vaccines Programme, Medical Research Council-Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine (MRC/UVRI and LSHTM) Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Department of Infection Biology, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Julien Kincaid-Smith
- Centre for Emerging, Endemic and Exotic Diseases (CEEED), Department of Pathobiology and Population Sciences (PPS), Royal Veterinary College, University of London, Herts, United Kingdom
| | | | - Joanne P. Webster
- Centre for Emerging, Endemic and Exotic Diseases (CEEED), Department of Pathobiology and Population Sciences (PPS), Royal Veterinary College, University of London, Herts, United Kingdom
| | - Shona Wilson
- Department of Pathology, University of Cambridge, Cambridge, United Kingdom
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Abstract
While disease and outbreaks are mainly clonal for bacteria and other asexually reproducing organisms, sexual reproduction in schistosomes and other helminths usually results in unique individuals. For sexually reproducing organisms, the traits conserved in clones will instead be conserved in the group of organisms that tends to breed together, the population. While the same tools are applied to characterize DNA, how results are interpreted can be quite different at times (see another article in this collection, http://www.asmscience.org/content/journal/microbiolspec/10.1128/microbiolspec.AME-0002-2018). It is difficult to know what the real effect any control program has on the parasite population without assessing the health of this population, how they respond to the control measure, and how they recover, if they do. This review, part of the Microbiology Spectrum Curated Collection: Advances in Molecular Epidemiology of Infectious Diseases, concentrates on one approach using pooled samples to study schistosome populations and shows how this and other approaches have contributed to our understanding of this parasite family's biology and epidemiology. *This article is part of a curated collection.
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Tetteh-Quarcoo PB, Forson PO, Amponsah SK, Ahenkorah J, Opintan JA, Ocloo JEY, Okine EN, Aryee R, Afutu E, Anang AK, Ayeh-Kumi PF. Persistent Urogenital Schistosomiasis and Its Associated Morbidity in Endemic Communities within Southern Ghana: Suspected Praziquantel Resistance or Reinfection? Med Sci (Basel) 2020; 8:E10. [PMID: 32050572 PMCID: PMC7151560 DOI: 10.3390/medsci8010010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 01/31/2020] [Accepted: 02/06/2020] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND schistosomiasis is a neglected tropical disease caused by helminths of the genus Schistosoma. The disease has a worldwide distribution, with more cases occurring in Africa. Urogenital schistosomiasis caused by S. haematobium with its associated morbidity is prevalent in many areas of Ghana. Praziquantel is still the recommended drug of choice for schistosomiasis treatment, although a number of studies have reported sub-therapeutic effects and associated treatment failure. The current study, therefore, assessed whether persistent schistosomiasis, with its associated morbidity among children living in endemic areas within the Greater Accra Region of Ghana, is as a result of reinfection or suspected praziquantel resistance. METHODOLOGY this was a longitudinal study involving a baseline and follow-up sampling after praziquantel treatment. Urine samples were collected from school children (whose parents had also consented) for the detection of S. haematobium ova using a sedimentation technique. The morbidity parameters were examined with urine chemistry strips, as well as microscopy. Viability was assessed using a modified hatchability technique, vital staining (0.4% trypan blue and 1% neutral red) and fluorescent (Hoechst 33258) microscopy. Infected individuals were treated with a single dose of praziquantel (40mg/kg). Resampling to determine reinfection was done sixth months post-treatment, after evidence of total egg clearance. For possible resistance assessment, egg counts and viability testing were conducted on the positive samples at the baseline, as well as weekly post-treatment follow-ups for 12 weeks. RESULTS out of the 420 school children sampled, 77 were initially positive but, after the sixth month sampling for reinfection assessment, eight out of the initial positives were infected again, giving a reinfection percentage of 10.4%. No suspected praziquantel resistance was recorded in the 21 positives detected out of the 360 sampled for suspected resistance assessment. The egg reduction rate increased weekly in the follow-up samples with a gradual reduction in the egg count. The study also recorded a gradual decrease in the percentage of live eggs after the first week; with all viability testing methods used complimenting each other. The morbidity parameters (proteinuria, haematuria and pyuria) changed between the baseline and post-treatment samples, eventually reducing to zero. CONCLUSIONS the outcome of this study suggests that the persistent schistosomiasis, with its associated morbidity observed in these endemic communities, is not likely to be as a result of praziquantel resistance, but reinfection. Even though there was no suspected resistance observed in the study, there remains the need to continuously intensify the monitoring of praziquantel in other endemic communities.
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Affiliation(s)
- Patience B. Tetteh-Quarcoo
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana; (P.O.F.); (J.A.O.); (R.A.); (E.A.); (P.F.A.-K.)
| | - Peter O. Forson
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana; (P.O.F.); (J.A.O.); (R.A.); (E.A.); (P.F.A.-K.)
| | - Seth K. Amponsah
- Department of Pharmacology and Toxicology, School of Pharmacy, College of Health Sciences, University of Ghana, Accra 233, Ghana;
| | - John Ahenkorah
- Department of Anatomy, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana;
| | - Japheth A. Opintan
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana; (P.O.F.); (J.A.O.); (R.A.); (E.A.); (P.F.A.-K.)
| | - Janet E. Y. Ocloo
- Department of Pathology, Korle-Bu Teaching Hospital, Korle-Bu, Accra 233, Ghana;
| | - Esther N. Okine
- Central Laboratory Services, Korle-Bu Teaching Hospital, Korle-Bu, Accra 233, Ghana;
| | - Robert Aryee
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana; (P.O.F.); (J.A.O.); (R.A.); (E.A.); (P.F.A.-K.)
- Department of Physiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana
| | - Emmanuel Afutu
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana; (P.O.F.); (J.A.O.); (R.A.); (E.A.); (P.F.A.-K.)
| | - Abraham K. Anang
- Department of Parasitology, Noguchi Memorial Institute for Medical Research, College of Health Sciences, University of Ghana, Accra 233, Ghana;
| | - Patrick F. Ayeh-Kumi
- Department of Medical Microbiology, School of Biomedical and Allied Health Sciences, College of Health Sciences, University of Ghana, Accra 233, Ghana; (P.O.F.); (J.A.O.); (R.A.); (E.A.); (P.F.A.-K.)
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11
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Abou El Dahab MM, Shahat SM, Mahmoud SSM, Mahana NA. In vitro effect of curcumin on Schistosoma species viability, tegument ultrastructure and egg hatchability. Exp Parasitol 2019; 199:1-8. [PMID: 30790572 DOI: 10.1016/j.exppara.2019.02.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Revised: 01/01/2019] [Accepted: 02/16/2019] [Indexed: 12/12/2022]
Abstract
Schistosomiasis remains a severe problem of public health in developing countries. The development of resistance to praziquantel (PZQ) has justified the search for new alternative chemotherapies with new formulations, more effective, and without adverse effects. Curcumin (CUR), the major phenolic compound present in rhizome of turmeric (Curcuma longa L.), has been traditionally used against various diseases including parasitic infections. Here, the antischistosomal activity of CUR (50-500 μM), evaluated in parallel against S. mansoni and S. haematobium adult worms, appeared significant (P < 0.05 to < 0.0001) in a time- and dose-dependent manner. Two h incubation with CUR (500 μM) caused 100% irreversible killing of both schistosomal species. CUR (250 μM) caused the death of S. haematobium and S. mansoni worms after 2 h and 4 h, respectively. As CUR concentration decreases (50 μM), all coupled adult worms were separated into individual male and female but the worms remained viable up to 4 h. Scanning and transmission electron microscopy revealed that S. haematobium are more sensitive than S. mansoni to CUR schistosomicidal effects. In support, CUR was found to affect the antigenicity of surface membrane molecules of S. haematobium, but not S. mansoni. Of importance, CUR significantly (P < 0.05 to < 0.0001) affected S. mansoni eggs hatchability and viability, a ground for its use in chemotherapy of schistosomiasis mansoni and japonicum because of its increased bioavailability in the gastrointestinal tract. The data together emphasize that CUR is a promising potential schistosomicidal drug.
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MESH Headings
- Animals
- Antigens, Helminth/immunology
- Antigens, Helminth/isolation & purification
- Antigens, Surface/immunology
- Antigens, Surface/isolation & purification
- Cricetinae
- Curcumin/pharmacology
- Dose-Response Relationship, Drug
- Enzyme-Linked Immunosorbent Assay
- Female
- Intestine, Small/parasitology
- Liver/parasitology
- Male
- Mesocricetus
- Mice
- Mice, Inbred BALB C
- Microscopy, Electron, Scanning
- Microscopy, Electron, Transmission
- Ovum/drug effects
- Ovum/physiology
- Schistosoma haematobium/drug effects
- Schistosoma haematobium/immunology
- Schistosoma haematobium/physiology
- Schistosoma haematobium/ultrastructure
- Schistosoma mansoni/drug effects
- Schistosoma mansoni/immunology
- Schistosoma mansoni/physiology
- Schistosoma mansoni/ultrastructure
- Schistosomicides/pharmacology
- Time Factors
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Affiliation(s)
- Marwa M Abou El Dahab
- Zoology Department, Faculty of Science, Cairo University, Giza, 12613, Egypt; Zoology Department, Faculty of Science, Ain Shams University, Cairo, 11566, Egypt
| | - Sondos M Shahat
- Zoology Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
| | | | - Noha A Mahana
- Zoology Department, Faculty of Science, Cairo University, Giza, 12613, Egypt.
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12
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Bergquist R, Elmorshedy H. Artemether and Praziquantel: Origin, Mode of Action, Impact, and Suggested Application for Effective Control of Human Schistosomiasis. Trop Med Infect Dis 2018; 3:tropicalmed3040125. [PMID: 30572592 PMCID: PMC6306701 DOI: 10.3390/tropicalmed3040125] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 12/05/2018] [Accepted: 12/11/2018] [Indexed: 02/02/2023] Open
Abstract
The stumbling block for the continued, single-drug use of praziquantel (PZQ) against schistosomiasis is less justified by the risk of drug resistance than by the fact that this drug is inactive against juvenile parasites, which will mature and start egg production after chemotherapy. Artemisinin derivatives, currently used against malaria in the form of artemisinin-based combination therapy (ACT), provide an opportunity as these drugs are not only active against malaria plasmodia, but surprisingly also against juvenile schistosomes. An artemisinin/PZQ combination would be complementary, and potentially additive, as it would kill two schistosome life cycle stages and thus confer a transmission-blocking modality to current chemotherapy. We focus here on single versus combined regimens in endemic settings. Although the risk of artemisinin resistance, already emerging with respect to malaria therapy in Southeast Asia, prevents use in countries where ACT is needed for malaria care, an artemisinin-enforced praziquantel treatment (APT) should be acceptable in regions of North Africa (including Egypt), the Middle East, China, and Brazil that are not endemic for malaria. Thanks to recent progress with respect to high-resolution diagnostics, based on circulating schistosome antigens in humans and molecular approaches for snail surveys, it should be possible to keep areas scheduled for schistosomiasis elimination under surveillance, bringing rapid response to bear on problems arising. The next steps would be to investigate where and for how long APT should be applied to make a lasting impact. A large-scale field trial in an area with modest transmission should tell how apt this approach is.
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Affiliation(s)
| | - Hala Elmorshedy
- College of Medicine, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia.
- Department of Tropical Health, High Institute of Public Health, Alexandria University, Alexandria 21561, Egypt.
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13
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Identification of Peptide Antagonists to Thioredoxin Glutathione Reductase of Schistosoma japonicum. BIOMED RESEARCH INTERNATIONAL 2018; 2018:9483928. [PMID: 29967790 PMCID: PMC6008883 DOI: 10.1155/2018/9483928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 03/23/2018] [Accepted: 04/03/2018] [Indexed: 01/19/2023]
Abstract
Schistosomiasis is one of the world's major public health problems. Praziquantel is currently the only effective drug against schistosomiasis. As resistance of praziquantel has emerged in some endemic areas, development of new antischistosomal agents should be a high priority. In this study, a phage display peptide library was used for screening for peptide antagonists of thioredoxin glutathione reductase of Schistosoma japonicum (SjTGR), which has been identified as an alternative drug target. Three rounds of panning produced four different fusion phages. ELISA proved that all four phages could bind to SjTGR. One peptide, JIPDys1 (aa, WPHNWWPHFKVK), reduced enzyme activity of SjTGR by more than 50%. 2 μM of the synthesized peptide of JIPDys1 inhibited the activity of TrxR, GR, and Grx of SjTGR by 32.5%, 100%, and 100%, respectively. The IC50 values of the synthetic peptide JIPDys1 for TrxR, GR, and Grx were 3.67 μM, 0.11 μM, and 0.97 μM, respectively. Based on computer simulation, it appeared that JIPDys1 binds to the substrate binding sites of glutathione reductase (GR) and glutaredoxin (Grx). Our data show that the peptide, JIPDys1 (aa, WPHNWWPHFKVK), is a promising candidate to develop novel drugs against S. japonicum which acts by binding with SjTGR and reduces enzyme activity of SjTGR.
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14
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Singh R, Beasley R, Long T, Caffrey CR. Algorithmic Mapping and Characterization of the Drug-Induced Phenotypic-Response Space of Parasites Causing Schistosomiasis. IEEE/ACM TRANSACTIONS ON COMPUTATIONAL BIOLOGY AND BIOINFORMATICS 2018; 15:469-481. [PMID: 27071187 PMCID: PMC5915339 DOI: 10.1109/tcbb.2016.2550444] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Neglected tropical diseases, especially those caused by helminths, constitute some of the most common infections of the world's poorest people. Amongst these, schistosomiasis (bilharzia or 'snail fever'), caused by blood flukes of the genus Schistosoma, ranks second only to malaria in terms of human impact: two hundred million people are infected and close to 800 million are at risk of infection. Drug screening against helminths poses unique challenges: the parasite cannot be cloned and is difficult to target using gene knockouts or RNAi. Consequently, both lead identification and validation involve phenotypic screening, where parasites are exposed to compounds whose effects are determined through the analysis of the ensuing phenotypic responses. The efficacy of leads thus identified derives from one or more or even unknown molecular mechanisms of action. The two most immediate and significant challenges that confront the state-of-the-art in this area are: the development of automated and quantitative phenotypic screening techniques and the mapping and quantitative characterization of the totality of phenotypic responses of the parasite. In this paper, we investigate and propose solutions for the latter problem in terms of the following: (1) mathematical formulation and algorithms that allow rigorous representation of the phenotypic response space of the parasite, (2) application of graph-theoretic and network analysis techniques for quantitative modeling and characterization of the phenotypic space, and (3) application of the aforementioned methodology to analyze the phenotypic space of S. mansoni - one of the etiological agents of schistosomiasis, induced by compounds that target its polo-like kinase 1 (PLK 1) gene - a recently validated drug target. In our approach, first, bio-image analysis algorithms are used to quantify the phenotypic responses of different drugs. Next, these responses are linearly mapped into a low- dimensional space using Principle Component Analysis (PCA). The phenotype space is modeled using neighborhood graphs which are used to represent the similarity amongst the phenotypes. These graphs are characterized and explored using network analysis algorithms. We present a number of results related to both the nature of the phenotypic space of the S. mansoni parasite as well as algorithmic issues encountered in constructing and analyzing the phenotypic-response space. In particular, the phenotype distribution of the parasite was found to have a distinct shape and topology. We have also quantitatively characterized the phenotypic space by varying critical model parameters. Finally, these maps of the phenotype space allows visualization and reasoning about complex relationships between putative drugs and their system-wide effects and can serve as a highly efficient paradigm for assimilating and unifying information from phenotypic screens both during lead identification and lead optimization.
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15
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Stenzel K, Chakrabarti A, Melesina J, Hansen FK, Lancelot J, Herkenhöhner S, Lungerich B, Marek M, Romier C, Pierce RJ, Sippl W, Jung M, Kurz T. Isophthalic Acid-Based HDAC Inhibitors as Potent Inhibitors of HDAC8 fromSchistosoma mansoni. Arch Pharm (Weinheim) 2017. [DOI: 10.1002/ardp.201700096] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Katharina Stenzel
- Institute of Pharmaceutical and Medicinal Chemistry; Heinrich-Heine-University; Düsseldorf Germany
| | - Alokta Chakrabarti
- Institute of Pharmaceutical Sciences; Albert-Ludwigs-University Freiburg; Freiburg Germany
| | - Jelena Melesina
- Institute of Pharmacy; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Finn K. Hansen
- Institute of Pharmaceutical and Medicinal Chemistry; Heinrich-Heine-University; Düsseldorf Germany
- Pharmaceutical/Medicinal Chemistry; Institute of Pharmacy; Leipzig University; Leipzig Germany
| | - Julien Lancelot
- Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille; U1019 UMR 8204CIIL - Centre d'Infection et d'Immunité de Lille; Lille France
| | - Simon Herkenhöhner
- Institute of Pharmaceutical and Medicinal Chemistry; Heinrich-Heine-University; Düsseldorf Germany
| | - Beate Lungerich
- Institute of Pharmaceutical and Medicinal Chemistry; Heinrich-Heine-University; Düsseldorf Germany
| | - Martin Marek
- IGBMC; Université de Strasbourg; Illkirch France
| | | | - Raymond. J. Pierce
- Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille; U1019 UMR 8204CIIL - Centre d'Infection et d'Immunité de Lille; Lille France
| | - Wolfgang Sippl
- Institute of Pharmacy; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Manfred Jung
- Institute of Pharmaceutical Sciences; Albert-Ludwigs-University Freiburg; Freiburg Germany
| | - Thomas Kurz
- Institute of Pharmaceutical and Medicinal Chemistry; Heinrich-Heine-University; Düsseldorf Germany
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16
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Prophylactic effect of artemether on human schistosomiasis mansoni among Egyptian children: A randomized controlled trial. Acta Trop 2016; 158:52-58. [PMID: 26921676 DOI: 10.1016/j.actatropica.2016.02.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 02/15/2016] [Accepted: 02/21/2016] [Indexed: 11/23/2022]
Abstract
A double-blind, randomized controlled trial was conducted in an endemic focus for Schistosoma mansoni in Kafr El-Sheikh Governorate, Northern Nile Delta, Egypt, to evaluate the prophylactic effect of artemether (ART) given in conjunction with praziquantel (PZQ). The study encompassed 913 primary school children randomly assigned to two treatment groups PZQ/ART and PZQ/ART-placebo. At baseline, both groups received 40 mg/kg body weight of PZQ twice four weeks apart, after which one group received 6 mg/kg body weight of ART every 3 weeks in 5 cycles during the transmission season and the other group received ART-placebo. At the end of the study, prevalence of infection among the PZQ/ART was approximately half that of the PZQ/ART-placebo group, i.e. 6.7% versus 11.6%, and incidence of new infections for the PZQ/ART was 2.7% versus 6.5% for the PZQ/ART-placebo. In conclusion, PZQ/ART combined therapy might be considered as an adjunct measure against human schistosomiasis, by specifically reducing transmission and therefore contribute to disease elimination.
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17
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Mendonça AMB, Feitosa APS, Veras DL, Matos-Rocha TJ, Cavalcanti MGDS, Barbosa CCGS, Brayner FA, Alves LC. THE SUSCEPTIBILITY OF RECENT ISOLATES OF Schistosoma mansoni TO PRAZIQUANTEL. Rev Inst Med Trop Sao Paulo 2016; 58:7. [PMID: 26910445 PMCID: PMC4793948 DOI: 10.1590/s1678-9946201658007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 05/18/2015] [Indexed: 12/03/2022] Open
Abstract
Introduction: Schistosomiasis is a chronic disease caused by trematode flatworms of the genus
Schistosoma and its control is dependent on a single drug, praziquantel (PZQ), but
concerns over PZQ resistance have renewed interest in evaluating the in vitro
susceptibility of recent isolates of Schistosoma mansoni to PZQ in comparison with
well-established strains in the laboratory. Material and methods: The in vitro activity of PZQ (6.5-0.003 µg/mL) was evaluated in terms of
mortality, reduced motor activity and ultrastructural alterations against S.
mansoni. Results: After 3 h of incubation, PZQ, at 6.5 µg/mL, caused 100% mortality of all adult
worms in the three types of recent isolates, while PZQ was inactive at
concentrations of 0.08-0.003 µg/mL after 3 h of incubation. The results show that
the SLM and Sotave isolates basically presented the same pattern of
susceptibility, differing only in the concentration of 6.5 µg/mL, where deaths
occurred from the range of 1.5 h in Sotave and just in the 3 h range of SLM.
Additionally, this article presents ultrastructural evidence of rapid severe
PZQ-induced surface membrane damage in S. mansoni after treatment with the drug,
such as disintegration, sloughing, and erosion of the surface. Conclusion: According to these results, PZQ is very effective to induce tegument destruction
of recent isolates of S. mansoni.
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Affiliation(s)
| | - Ana Paula S Feitosa
- Department of Parasitology, Centro de Pesquisas Aggeu Magalhães, Recife, PE, Brazil
| | - Dyana L Veras
- Department of Parasitology, Centro de Pesquisas Aggeu Magalhães, Recife, PE, Brazil
| | - Thiago J Matos-Rocha
- Department of Parasitology, Centro de Pesquisas Aggeu Magalhães, Recife, PE, Brazil
| | | | | | - Fábio A Brayner
- Department of Parasitology, Centro de Pesquisas Aggeu Magalhães, Recife, PE, Brazil
| | - Luiz C Alves
- Department of Parasitology, Centro de Pesquisas Aggeu Magalhães, Recife, PE, Brazil
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18
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Walker M, Mabud TS, Olliaro PL, Coulibaly JT, King CH, Raso G, Scherrer AU, Stothard JR, Sousa-Figueiredo JC, Stete K, Utzinger J, Basáñez MG. New approaches to measuring anthelminthic drug efficacy: parasitological responses of childhood schistosome infections to treatment with praziquantel. Parasit Vectors 2016; 9:41. [PMID: 26813154 PMCID: PMC4728951 DOI: 10.1186/s13071-016-1312-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 11/20/2015] [Indexed: 11/30/2022] Open
Abstract
Background By 2020, the global health community aims to control and eliminate human helminthiases, including schistosomiasis in selected African countries, principally by preventive chemotherapy (PCT) through mass drug administration (MDA) of anthelminthics. Quantitative monitoring of anthelminthic responses is crucial for promptly detecting changes in efficacy, potentially indicative of emerging drug resistance. Statistical models offer a powerful means to delineate and compare efficacy among individuals, among groups of individuals and among populations. Methods We illustrate a variety of statistical frameworks that offer different levels of inference by analysing data from nine previous studies on egg counts collected from African children before and after administration of praziquantel. Results We quantify responses to praziquantel as egg reduction rates (ERRs), using different frameworks to estimate ERRs among population strata, as average responses, and within strata, as individual responses. We compare our model-based average ERRs to corresponding model-free estimates, using as reference the World Health Organization (WHO) 90 % threshold of optimal efficacy. We estimate distributions of individual responses and summarize the variation among these responses as the fraction of ERRs falling below the WHO threshold. Conclusions Generic models for evaluating responses to anthelminthics deepen our understanding of variation among populations, sub-populations and individuals. We discuss the future application of statistical modelling approaches for monitoring and evaluation of PCT programmes targeting human helminthiases in the context of the WHO 2020 control and elimination goals. Electronic supplementary material The online version of this article (doi:10.1186/s13071-016-1312-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Martin Walker
- Department of Infectious Disease Epidemiology, School of Public Health, Faculty of Medicine (St Mary's Campus), Imperial College London, London, W2 1PG, UK. .,London Centre for Neglected Tropical Disease Research, Department of Infectious Disease Epidemiology, Imperial College London, London, W2 1PG, UK.
| | - Tarub S Mabud
- Department of Infectious Disease Epidemiology, School of Public Health, Faculty of Medicine (St Mary's Campus), Imperial College London, London, W2 1PG, UK. .,Present address: Stanford School of Medicine, 291 Campus Drive, Stanford, CA, 94305, USA.
| | - Piero L Olliaro
- UNICEF/UNDP/World Bank/WHO Special Programme on Research and Training in Tropical Diseases (TDR), World Health Organization, Av. Appia 20, CH-1211, Geneva 27, Switzerland. .,Centre for Tropical Medicine and Global Health Nuffield Department of Medicine Research Building, University of Oxford Old Road Campus, Roosevelt Drive, Oxford, OX3 7FZ, UK.
| | - Jean T Coulibaly
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, P.O. Box, CH-4002, Basel, Switzerland. .,University of Basel, P.O. Box, CH-4003, Basel, Switzerland. .,Unité de Formation et de Recherche Biosciences, Université Félix Houphouët-Boigny, 22 BP 770, Abidjan 22, Côte d'Ivoire. .,Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, 01 BP 1303, Abidjan 01, Côte d'Ivoire.
| | - Charles H King
- Center for Global Health and Diseases, Case Western Reserve University, 2109 Adelbert Road, Cleveland, OH, 44106, USA. .,Schistosomiasis Consortium for Operational Research and Evaluation, University of Georgia, 500 D W Brooks Drive, Athens, GA, 30602, USA.
| | - Giovanna Raso
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, P.O. Box, CH-4002, Basel, Switzerland. .,University of Basel, P.O. Box, CH-4003, Basel, Switzerland.
| | - Alexandra U Scherrer
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Rämistrasse 100, CH-8091, Zurich, Switzerland.
| | - J Russell Stothard
- Department of Parasitology, London School of Tropical Medicine, Liverpool, L3 5QA, UK.
| | - José Carlos Sousa-Figueiredo
- Centro de Investigação em Saúde de Angola (Health Research Center in Angola), Rua direita do Caxito, Hospital Provincial, Bengo, Angola. .,Department of Life Sciences, Natural History Museum, Wolfson Wellcome Biomedical Laboratories, Cromwell Road, London, SW7 5BD, UK.
| | - Katarina Stete
- Center for Infectious Diseases and Travel Medicine, Department of Medicine, University Hospital Freiburg, Hugstetter Strasse 55, D-79106, Freiburg, Germany.
| | - Jürg Utzinger
- Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, P.O. Box, CH-4002, Basel, Switzerland. .,University of Basel, P.O. Box, CH-4003, Basel, Switzerland.
| | - Maria-Gloria Basáñez
- Department of Infectious Disease Epidemiology, School of Public Health, Faculty of Medicine (St Mary's Campus), Imperial College London, London, W2 1PG, UK. .,London Centre for Neglected Tropical Disease Research, Department of Infectious Disease Epidemiology, Imperial College London, London, W2 1PG, UK.
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19
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Stecher CW, Kallestrup P, Kjetland EF, Vennervald B, Petersen E. Considering treatment of male genital schistosomiasis as a tool for future HIV prevention: a systematic review. Int J Public Health 2015; 60:839-48. [PMID: 26298443 DOI: 10.1007/s00038-015-0714-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 06/26/2015] [Accepted: 07/03/2015] [Indexed: 01/31/2023] Open
Abstract
OBJECTIVES Male genital schistosomiasis (MGS) is a neglected manifestation of Schistosoma haematobium infection with ignored implications on reproductive health and a differential diagnosis to sexually transmitted infections in endemic regions. MGS may have associations with HIV transmission and acquisition, and treatment could be a neglected chance of HIV prevention. This review summarizes current knowledge on epidemiology, clinical manifestations, diagnosis and treatment of MGS as a hypothesized risk factor for HIV transmission. Future research areas of global interest are suggested. METHODS PubMed published literature was reviewed based on the MOOSE guidelines. All publications on MGS were included regardless of publication year and study design. Furthermore, all publications were searched for information on possible HIV association. RESULTS The 40 identified publications related to MGS were dominated by case reports and observational studies. No randomized clinical trials have been conducted to date, and very scant information related to possible associations with HIV transmission was presented. CONCLUSIONS Clinical, randomized studies and epidemiological studies covering the possible association between MGS and HIV are urgently needed. Furthermore, field diagnostic tools should be developed and future mass treatment programs should include adults to reduce morbidity and prevent HIV acquisition. SYSTEMATIC REVIEW REGISTRATION NUMBER CRD42015016252.
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Affiliation(s)
- Chalotte Willemann Stecher
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.
- Center for Global Health (GloHAU), Aarhus University, Aarhus, Denmark.
| | - Per Kallestrup
- Center for Global Health (GloHAU), Aarhus University, Aarhus, Denmark.
| | - Eyrun Floerecke Kjetland
- Norwegian Centre for Imported and Tropical Diseases, Oslo University Hospital, Oslo, Norway.
- Discipline of Public Health Medicine, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa.
| | - Birgitte Vennervald
- Department of Parasitology and Aquatic Diseases, University of Copenhagen, Copenhagen, Denmark.
| | - Eskild Petersen
- Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark.
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Mwangi IN, Sanchez MC, Mkoji GM, Agola LE, Runo SM, Cupit PM, Cunningham C. Praziquantel sensitivity of Kenyan Schistosoma mansoni isolates and the generation of a laboratory strain with reduced susceptibility to the drug. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2014; 4:296-300. [PMID: 25516840 PMCID: PMC4266778 DOI: 10.1016/j.ijpddr.2014.09.006] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We isolated S. mansoni miracidia from 72 Kenyan adults and children. We found no evidence of S. mansoni with reduced praziquantel sensitivity. An S. mansoni lab isolate with reduced praziquantel sensitivity was established. The potential for the emergence of praziquantel resistance remains.
Schistosomiasis is a neglected tropical disease caused by blood-dwelling flukes of the genus Schistosoma. While the disease may affect as many as 249 million people, treatment largely relies on a single drug, praziquantel. The near exclusive use of this drug for such a prevalent disease has led to concerns regarding the potential for drug resistance to arise and the effect this would have on affected populations. In this study, we use an in vitro assay of drug sensitivity to test the effect of praziquantel on miracidia hatched from eggs obtained from fecal samples of Kenyan adult car washers and sand harvesters as well as school children. Whereas in a previous study we found the car washers and sand harvesters to harbor Schistosoma mansoni with reduced praziquantel sensitivity, we found no evidence for the presence of such strains in any of the groups tested here. Using miracidia derived from seven car washers to infect snails, we used the shed cercariae to establish a strain of S. mansoni with significantly reduced praziquantel sensitivity in mice. This was achieved within 5 generations by administering increasing doses of praziquantel to the infected mice until the parasites could withstand a normally lethal dose. This result indicates that while the threat of praziquantel resistance may have diminished in the Kenyan populations tested here, there is a strong likelihood it could return if sufficient praziquantel pressure is applied.
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Affiliation(s)
- Ibrahim N Mwangi
- Center for Biotechnology Research and Development, Kenya Medical Research Institute, Nairobi, Kenya
| | - Melissa C Sanchez
- Dept. of Biology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Gerald M Mkoji
- Center for Biotechnology Research and Development, Kenya Medical Research Institute, Nairobi, Kenya
| | - Lelo E Agola
- Center for Biotechnology Research and Development, Kenya Medical Research Institute, Nairobi, Kenya
| | - Steven M Runo
- Dept. of Biochemistry and Biotechnology, Kenyatta University, Nairobi, Kenya
| | - Pauline M Cupit
- Dept. of Biology, University of New Mexico, Albuquerque, NM 87131, USA
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Liu YX, Wu W, Liang YJ, Jie ZL, Wang H, Wang W, Huang YX. New uses for old drugs: the tale of artemisinin derivatives in the elimination of schistosomiasis japonica in China. Molecules 2014; 19:15058-74. [PMID: 25244286 PMCID: PMC6271675 DOI: 10.3390/molecules190915058] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 09/09/2014] [Accepted: 09/10/2014] [Indexed: 11/16/2022] Open
Abstract
Artemisinin (qinghaosu), extracted from the Chinese herb Artemisia annua L. in 1972, and its three major derivatives--artemether, artesunate and dihydroartemisinin--were firstly identified as antimalarials and found active against all species of the malaria parasite. Since the early 1980s, artemisinin and its derivatives have been found efficacious against Schistosoma spp., notably larval parasites, and artemisinin derivatives have played a critical role in the prevention and treatment of human schistosomiasis in China. Currently, China is moving towards the progress of schistosomiasis elimination. However, the potential development of praziquantel resistance may pose a great threat to the progress of elimination of schistosomiasis japonica in China. Fortunately, these three major artemisinin derivatives also exhibit actions against adult parasites, and reduced sensitivity to artemether, artesunate and dihydroartemisinin has been detected in praziquantel-resistant S. japonicum. In this review, we describe the application of artemisinin derivatives in the prevention and treatment of schistosomiasis japonica in China, so as to provide tools for the global agenda of schistosomiasis elimination. In addition to antimalarial and antischistosomal actions, they also show activities against other parasites and multiple cancers. Artemisinin derivatives, as old drugs identified firstly as antimalarials, continue to create new stories.
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Affiliation(s)
- Yi-Xin Liu
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, China.
| | - Wei Wu
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, China.
| | - Yue-Jin Liang
- Department of Microbiology and Immunology, The University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, USA.
| | - Zu-Liang Jie
- Department of Microbiology and Immunology, The University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, USA.
| | - Hui Wang
- Department of Integrative Biology and Pharmacology, The University of Texas Health Science Center at Houston, 6431 Fannin St, Houston, TX 77030, USA.
| | - Wei Wang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, China.
| | - Yi-Xin Huang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, China.
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Ojurongbe O, Sina-Agbaje OR, Busari A, Okorie PN, Ojurongbe TA, Akindele AA. Efficacy of praziquantel in the treatment of Schistosoma haematobium infection among school-age children in rural communities of Abeokuta, Nigeria. Infect Dis Poverty 2014; 3:30. [PMID: 25215186 PMCID: PMC4161270 DOI: 10.1186/2049-9957-3-30] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 08/11/2014] [Indexed: 12/25/2022] Open
Abstract
Background Chemotherapy with praziquantel (PZQ) has been the cornerstone of schistosomiasis control over the last two decades. Being the only available drug for the treatment of over 200 million people worldwide, continuous monitoring of PZQ efficacy under the pressure of widespread use is therefore advocated. Methods The efficacy of taking two doses of oral PZQ for the treatment of Schistosoma haematobium was examined among school children in Nigeria. Urine specimens were collected from 350 school children and examined using the filtration technique. Blood was collected for packed cell volume (PCV) estimation, and the weight and height of each child were estimated. S. haematobium egg positive pupils were treated with two oral doses of PZQ at 40 mg/kg with a four-week interval in between. Drug efficacy was determined based on the egg reduction rate (ERR). Results Among 350 school children, 245 (70.0%) – of which 132 were males and 113 were females, with an age range of 4 to 15 years – were diagnosed with S. haematobium. All the 245 infected children received a single oral dose of 40 mg/kg PZQ twice with a four-week interval in between and were followed up for 12 weeks. At four, eight and twelve weeks post treatment, the ERR was 57.1%, 77.6% and 100%, respectively. The ERR was significantly higher among the children with a light infection compared to those with a heavy infection. One hundred and twenty-one children were egg negative at four weeks post treatment, among which 1 (6.3) and 120 (52.4%) had heavy and light infections, respectively. Following the second round of treatment, the cure rate at eight weeks and twelve weeks was 85.3% and 100%, respectively. Conclusion This study demonstrated the efficacy of taking two doses of oral PZQ for the treatment of urinary schistosomiasis among school children in Nigeria.
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Affiliation(s)
- Olusola Ojurongbe
- Department of Medical Microbiology and Parasitology, Ladoke Akintola University of Technology, Osogbo, Nigeria
| | | | - Abass Busari
- Department of Medical Laboratory Services, Olikoye Ransome-Kuti Hospital, Abeokuta, Nigeria
| | - Patricia Nkem Okorie
- Institute for Advanced Medical Research and Training, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | | | - Akeem Abiodun Akindele
- Department of Medical Microbiology and Parasitology, Ladoke Akintola University of Technology, Osogbo, Nigeria
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Bruschi F. The challenge of antiparasitic resistance. J Glob Antimicrob Resist 2014; 2:131-132. [PMID: 27873718 DOI: 10.1016/j.jgar.2014.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Fabrizio Bruschi
- Department of Translational Research, Università di Pisa, School of Medicine, Pisa, Italy.
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Lu P, Wang W, Dai J, Liang Y. Imported African schistosomiasis: is it an emerging public health concern in China? J Travel Med 2014; 21:72-3. [PMID: 24383656 DOI: 10.1111/jtm.12073_1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ping Lu
- Key Laboratory of Technology on Parasitic Disease Prevention and Control, Jiangsu Institute of Parasitic Diseases, Ministry of Health, Wuxi, China
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Wang W, Li TY, Ji Y, Qu GL, Qian YL, Li HJ, Dai JR, Liang YS. Efficacy of artemether and artesunate in mice infected with praziquantel non-susceptible isolate of Schistosoma japonicum. Parasitol Res 2013; 113:925-31. [DOI: 10.1007/s00436-013-3724-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 11/27/2013] [Indexed: 10/25/2022]
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Praziquantel treatment of school children from single and mixed infection foci of intestinal and urogenital schistosomiasis along the Senegal River Basin: monitoring treatment success and re-infection patterns. Acta Trop 2013; 128:292-302. [PMID: 23022016 DOI: 10.1016/j.actatropica.2012.09.010] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 09/16/2012] [Accepted: 09/17/2012] [Indexed: 11/23/2022]
Abstract
Following major water development schemes in the 1980s, schistosomiasis has become a serious parasitic disease of children living in the Senegal River Basin. Both urogenital (Schistosoma haematobium) and intestinal (Schistosoma mansoni) schistosomiasis can be highly prevalent in school-aged children, with many individuals infected with both parasites. In order to investigate the transmission and re-infection dynamics of both parasite species, single and mixed infection foci at three villages (Nder and Temeye; S. mansoni and S. haematobium foci and Guia; S. haematobium focus) were studied. In each focus infected children were identified and selected for a 12-month study involving two treatments with praziquantel (40mg/kg) three weeks apart at the beginning of the study and again 6 months into the study. Urine and stool samples were examined for schistosome eggs before and at 6 weeks and 6 months after chemotherapy. Prevalence and intensity of infection were recorded for each child at each time point. Before treatment, in all three villages, the prevalence and intensity of infection was extremely high for both S. mansoni (79-100%) and S. haematobium (81-97%). With the first round of chemotherapy sufficient cure rates (CRs) of both species were achieved in all villages (38-96%) with high egg reduction rates (ERRs) (97-99%). The data show that high and rapid re-infection rates occur, especially for S. mansoni, within a six-month period following treatment. Re-infection must be highly linked to ecological and seasonal factors. The persistence of S. mansoni in Nder could raise concern as levels of infection intensity remain high (geometric mean intensity at baseline 653epg changed to 705epg at 12 months) after four rounds of chemotherapy. This phenomenon could be explained by extremely rapid re-infection dynamics or a sub-optimal efficacy of praziquantel against S. mansoni in this village. High intensities in mixed infections may influence disease epidemiology and control warranting further studies. The disease situation in the SRB must be monitored closely and new treatment regimes should be designed and implemented to control schistosomiasis in the school-age population.
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Is there a reduced sensitivity of dihydroartemisinin against praziquantel-resistant Schistosoma japonicum? Parasitol Res 2013; 113:223-8. [PMID: 24146208 DOI: 10.1007/s00436-013-3647-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 10/09/2013] [Indexed: 01/28/2023]
Abstract
Praziquantel is currently the only drug of choice for the treatment of human schistosomiases. However, it has been proved that Schistosoma japonicum subjected to drug pressure may develop resistance to praziquantel. To evaluate the efficacy of dihydroartemisinin against praziquantel-resistant S. japonicum, mice infected with a praziquantel-resistant isolate and a praziquantel-susceptible isolate of S. japonicum were treated with dihydroartemisinin at a single oral dose of 300 mg/kg given once on each of 35-36 post-infection days, while infected but untreated mice served as controls. All mice were sacrificed 50 days post-infection, and the worm burden reductions were estimated. Administration of dihydroartemisinin at a single oral dose of 300 mg/kg on each of 35-36 post-infection days reduced total worm burdens of 69.8% and female worm burdens of 86% in mice infected with the praziquantel-susceptible isolate, and total worm burdens of 66.1% and female worm burdens of 85.1% in mice infected with the praziquantel-resistant isolate (both P values > 0.05). It is concluded that the sensitivity of artemisinin derivative dihydroartemisinin does not reduce in praziquantel-resistant S. japonicum.
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Wang W, Liang YS, Hong QB, Dai JR. African schistosomiasis in mainland China: risk of transmission and countermeasures to tackle the risk. Parasit Vectors 2013; 6:249. [PMID: 23985040 PMCID: PMC3765897 DOI: 10.1186/1756-3305-6-249] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 08/24/2013] [Indexed: 11/10/2022] Open
Abstract
Schistosomiasis is a major disease of public health importance in humans occurring in 76 countries of the tropics and sub-tropics. In China, schistosomiasis japonica is one of the highest priorities in communicable disease control defined by the central government. Since 1970s, the habitats of Biomphalaria straminea, an intermediate host of Schistosoma mansoni in South America, have been identified in Hong Kong Special Administrative Region and Shenzhen city, Guangdong province of China. With the sharp growth in the China-aided projects in Africa and labor services export to Africa, a gradual rise in the cases infected with S. haematobium or S. mansoni is reported in those returning from Africa to China. The existence of intermediate snail hosts and import of infectious source of schistosomiasis results in concern about the transmission of African schistosomiasis in mainland China in the context of global climate change. This paper evaluates the risk of transmission of African schistosomiasis in China, and proposes countermeasures and research priorities to tackle the risk.
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Affiliation(s)
- Wei Wang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Jiangsu Provincial Key Laboratory of Molecular Biology of Parasites, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
| | - You-Sheng Liang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Jiangsu Provincial Key Laboratory of Molecular Biology of Parasites, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
| | - Qing-Biao Hong
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Jiangsu Provincial Key Laboratory of Molecular Biology of Parasites, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
| | - Jian-Rong Dai
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
- Jiangsu Provincial Key Laboratory of Molecular Biology of Parasites, 117 Yangxiang, Meiyuan, Wuxi, Jiangsu Province 214064, People’s Republic of China
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Use of cell-free circulating schistosome DNA in serum, urine, semen, and saliva to monitor a case of refractory imported schistosomiasis hematobia. J Clin Microbiol 2013; 51:3435-8. [PMID: 23884992 DOI: 10.1128/jcm.01219-13] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
This case of imported refractory schistosomiasis has highlighted the usefulness of cell-free parasite DNA as a diagnostic marker to assess active schistosome infection. In contrast to the rapid disappearance of ova in urine, parasite DNA remained persistent in several other specimen types even after the fourth treatment with praziquantel. This result was consistent with the presence of morphologically intact ova in bladder biopsy samples and with the corresponding symptoms.
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Abstract
Schistosomes are parasitic flatworms that cause schistosomiasis, a neglected tropical disease that affects hundreds of millions worldwide. Treatment and control of schistosomiasis relies almost entirely on the single drug praziquantel (PZQ), making the prospect of emerging drug resistance particularly worrisome. This review will survey reports of PZQ (and other drug) resistance in schistosomes and other platyhelminths, and explore mechanisms by which drug resistance might develop. Newer genomic and post-genomic strategies that offer the promise of better understanding of how drug resistance might arise in these organisms will be discussed. These approaches could also lead to insights into the mode of action of these drugs and potentially provide markers for monitoring the emergence of resistance.
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Cioli D, Basso A, Valle C, Pica-Mattoccia L. Decades down the line: the viability of praziquantel for future schistosomiasis treatment. Expert Rev Anti Infect Ther 2013; 10:835-7. [PMID: 23030319 DOI: 10.1586/eri.12.70] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Morais ER, Oliveira KC, Magalhães LG, Moreira EBC, Verjovski-Almeida S, Rodrigues V. Effects of curcumin on the parasite Schistosoma mansoni: a transcriptomic approach. Mol Biochem Parasitol 2012; 187:91-7. [PMID: 23276630 DOI: 10.1016/j.molbiopara.2012.11.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 11/19/2012] [Accepted: 11/27/2012] [Indexed: 11/28/2022]
Abstract
Schistosomiasis remains a severe problem of public health in developing countries. Several reports show that praziquantel, the drug of choice for treating schistosomiasis, can select Schistosoma mansoni strains resistant to the drug. Thus, developing new drugs against this parasitosis is a highly desirable goal. Curcumin, a phenolic compound deriving from the plant Curcuma longa, has been shown to have anticancer, anti-inflammatory and antiparasitic effects. Recently, our group has demonstrated that curcumin causes the separation of S. mansoni adult worm pairs, eggs infertility, decreased oviposition and parasite viability, leading to death. In the present work, we have investigated the effects of curcumin on S. mansoni gene expression in adult worms through microarray analyses. Our results showed 2374 genes that were significantly and differentially expressed, of which 981 were up-regulated and 1393 were down-regulated. Among the differentially expressed genes there were components of important signaling pathways involved in embryogenesis and oogenesis such as Notch and TGF-β. Gene networks most significantly enriched with altered genes were identified, including a network related to Cellular Function and Maintenance, Molecular Transport, Organ Development, which is connected to the TGF-β signaling pathway and might be related to the effect of curcumin on pairing of adult worm pairs, egg production and viability of worms. qPCR validation experiments with 7 genes have confirmed the expression changes detected with arrays. Here we suggest that transcriptional repression observed in Notch and TGF-β pathways could explain the effects on oviposition and egg development described in the literature.
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Affiliation(s)
- Enyara R Morais
- Faculdade de Medicina de Ribeirão Preto, Departamento de Bioquímica e Imunologia, Universidade de São Paulo, Av. Bandeirantes, 3900, Monte Alegre, 14040-900 Ribeirão Preto, SP, Brazil.
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Wang W, Wang L, Liang YS. Susceptibility or resistance of praziquantel in human schistosomiasis: a review. Parasitol Res 2012; 111:1871-7. [PMID: 23052781 DOI: 10.1007/s00436-012-3151-z] [Citation(s) in RCA: 257] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Accepted: 09/26/2012] [Indexed: 01/07/2023]
Abstract
Since praziquantel was developed in 1970s, it has replaced other antischistosomal drugs to become the only drug of choice for treatment of human schistosomiases, due to high efficacy, excellent tolerability, few and transient side effects, simple administration, and competitive cost. Praziquantel-based chemotherapy has been involved in the global control strategy of the disease and led to the control strategy shifting from disease control to morbidity control, which has greatly reduced the prevalence and intensity of infections. Given that the drug has been widely used for morbidity control in endemic areas for more than three decades, the emergence of resistance of Schistosoma to praziquantel under drug selection pressure has been paid much attention. It is possible to induce resistance of Schistosoma mansoni and Schistosoma japonicum to praziquantel in mice under laboratorial conditions, and a reduced susceptibility to praziquantel in the field isolates of S. mansoni has been found in many foci. In addition, there are several schistosomiasis cases caused by Schistosoma haematobium infections in which repeated standard treatment fails to clear the infection. However, in the absence of exact mechanisms of action of praziquantel, the mechanisms of drug resistance in schistosomes remain unclear. The present review mainly demonstrates the evidence of drug resistance in the laboratory and field and the mechanism of praziquantel resistance and proposes some strategies for control of praziquantel resistance in schistosomes.
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Affiliation(s)
- Wei Wang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi City, Jiangsu Province 214064, People's Republic of China.
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Ahmed AM, Abbas H, Mansour FA, Gasim GI, Adam I. Schistosoma haematobium infections among schoolchildren in central Sudan one year after treatment with praziquantel. Parasit Vectors 2012; 5:108. [PMID: 22676052 PMCID: PMC3434009 DOI: 10.1186/1756-3305-5-108] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 06/07/2012] [Indexed: 11/13/2022] Open
Abstract
Background Chemotherapy with praziquantel (PZQ) is the mainstay of schistosomiasis control. However, there are recent concerns about tolerance or resistance to PZQ, so that monitoring its efficacy in different settings is required. Methods A longitudinal study was conducted to evaluate the impact of PZQ for the treatment of Schistosoma haematobium infection among schoolchildren at Al Salamania, Central Sudan. Parasitological examinations for S. haematobium were performed in a cohort of schoolchildren (6–15 years of age) before and 1 year after treatment with a single dose of PZQ 40 mg/kg. Results Out of 562 (309 boys and 253 girls) schoolchildren recruited from three elementary schools, 420 completed one longitudinal dataset that comprised of data from two time points; baseline, and follow-up 1 year after treatment with a single dose of PZQ 40 mg/kg for S. haematobium infection. A single dose of PZQ significantly reduced the prevalence of S. haematobium infection by 83.3% (from 51.4% to 8.6%) and the geometric mean intensity of infection of positive individuals by 17.0% (from 87.7 to 72.8 eggs/10 ml of urine) 1 year after treatment. While there was no significant difference in the reduction of the prevalence of S. haematobium infection between the gender or age groups, there was a significantly higher reduction of intensity of S. haematobium infection among girls in comparison with boys. Conclusion There was a significant reduction of S. haematobium infection 1 year after PZQ treatment in this setting.
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Affiliation(s)
- Abedaziz M Ahmed
- Schistosomiasis Research Laboratory, Faculty of Science, University of Khartoum, Khartoum, Sudan
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Papoutsoglou N, Tappe D, Demmer P, Kocot A, Riedmiller H. Urinary incontinence due to the presence of necrotic adult Schistosoma haematobium parasite in the bladder following travel to Egypt. Travel Med Infect Dis 2012; 10:205-7. [PMID: 22658784 DOI: 10.1016/j.tmaid.2012.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 04/30/2012] [Accepted: 05/08/2012] [Indexed: 11/25/2022]
Abstract
A case of seronegative urinary Schistosomiasis is reported in a 68-year-old Caucasian male presenting with urgency of micturition and incontinence several months after bathing in a chlorinated pool of a first class hotel in Egypt. The symptoms were initiated by a necrotic adult Schistosoma haematobium parasite found in the urinary bladder following a cystoscopic examination. The purpose of this report is to describe this probable and uncommon source of Schistosomiasis, to demonstrate that Schistosoma parasites can also be found in the urinary bladder and to emphasize the importance of travel history.
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Affiliation(s)
- N Papoutsoglou
- Department of Urology and Pediatric Urology, Julius Maximilian University Medical School, Würzburg, Germany.
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Song L, Li J, Xie S, Qian C, Wang J, Zhang W, Yin X, Hua Z, Yu C. Thioredoxin glutathione reductase as a novel drug target: evidence from Schistosoma japonicum. PLoS One 2012; 7:e31456. [PMID: 22384025 PMCID: PMC3285170 DOI: 10.1371/journal.pone.0031456] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 01/08/2012] [Indexed: 11/22/2022] Open
Abstract
Background Schistosomiasis remains a major public health concern affecting billions of people around the world. Currently, praziquantel is the only drug of choice for treatment of human schistosomiasis. The emergence of drug resistance to praziquantel in schistosomes makes the development of novel drugs an urgent task. Thioredoxin glutathione reductase (TGR) enzymes in Schistosoma mansoni and some other platyhelminths have been identified as alternative targets. The present study was designed to confirm the existense and the potential value of TGR as a target for development of novel antischistosomal agents in Schistosoma japonicum, a platyhelminth endemic in Asia. Methods and Findings After cloning the S. japonicum TGR (SjTGR) gene, the recombinant SjTGR selenoprotein was purified and characterized in enzymatic assays as a multifunctional enzyme with thioredoxin reductase (TrxR), glutathione reductase (GR) and glutaredoxin (Grx) activities. Immunological and bioinformatic analyses confirmed that instead of having separate TrxR and GR proteins in mammalian, S. japonicum only encodes TGR, which performs the functions of both enzymes and plays a critical role in maintaining the redox balance in this parasite. These results were in good agreement with previous findings in Schistosoma mansoni and some other platyhelminths. Auranofin, a known inhibitor against TGR, caused fatal toxicity in S. japonicum adult worms in vitro and reduced worm and egg burdens in S. japonicum infected mice. Conclusions Collectively, our study confirms that a multifunctional enzyme SjTGR selenoprotein, instead of separate TrxR and GR enzymes, exists in S. japonicum. Furthermore, TGR may be a potential target for development of novel agents against schistosomes. This assumption is strengthened by our demonstration that the SjTGR is an essential enzyme for maintaining the thiol-disulfide redox homeostasis of S. japonicum.
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Affiliation(s)
- LiJun Song
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, People's Republic of China
| | - JiaHuang Li
- The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, People's Republic of China
| | - ShuYing Xie
- Department of Schistosomiasis Diagnosis, Jiangxi Institute of Parasitic Disease, Nanchang, Jiangxi, People's Republic of China
| | - ChunYan Qian
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, People's Republic of China
| | - Jie Wang
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, People's Republic of China
| | - Wei Zhang
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, People's Republic of China
| | - XuRen Yin
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, People's Republic of China
| | - ZiChun Hua
- The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, People's Republic of China
- * E-mail: (ZCH); (CXY)
| | - ChuanXin Yu
- Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, Jiangsu Institute of Parasitic Diseases, Wuxi, Jiangsu, People's Republic of China
- * E-mail: (ZCH); (CXY)
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Kjetland EF, Leutscher PD, Ndhlovu PD. A review of female genital schistosomiasis. Trends Parasitol 2012; 28:58-65. [DOI: 10.1016/j.pt.2011.10.008] [Citation(s) in RCA: 165] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2011] [Revised: 10/23/2011] [Accepted: 10/24/2011] [Indexed: 12/21/2022]
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Lee H, Moody-Davis A, Saha U, Suzuki BM, Asarnow D, Chen S, Arkin M, Caffrey CR, Singh R. Quantification and clustering of phenotypic screening data using time-series analysis for chemotherapy of schistosomiasis. BMC Genomics 2012; 13 Suppl 1:S4. [PMID: 22369037 PMCID: PMC3471343 DOI: 10.1186/1471-2164-13-s1-s4] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Neglected tropical diseases, especially those caused by helminths, constitute some of the most common infections of the world's poorest people. Development of techniques for automated, high-throughput drug screening against these diseases, especially in whole-organism settings, constitutes one of the great challenges of modern drug discovery. Method We present a method for enabling high-throughput phenotypic drug screening against diseases caused by helminths with a focus on schistosomiasis. The proposed method allows for a quantitative analysis of the systemic impact of a drug molecule on the pathogen as exhibited by the complex continuum of its phenotypic responses. This method consists of two key parts: first, biological image analysis is employed to automatically monitor and quantify shape-, appearance-, and motion-based phenotypes of the parasites. Next, we represent these phenotypes as time-series and show how to compare, cluster, and quantitatively reason about them using techniques of time-series analysis. Results We present results on a number of algorithmic issues pertinent to the time-series representation of phenotypes. These include results on appropriate representation of phenotypic time-series, analysis of different time-series similarity measures for comparing phenotypic responses over time, and techniques for clustering such responses by similarity. Finally, we show how these algorithmic techniques can be used for quantifying the complex continuum of phenotypic responses of parasites. An important corollary is the ability of our method to recognize and rigorously group parasites based on the variability of their phenotypic response to different drugs. Conclusions The methods and results presented in this paper enable automatic and quantitative scoring of high-throughput phenotypic screens focused on helmintic diseases. Furthermore, these methods allow us to analyze and stratify parasites based on their phenotypic response to drugs. Together, these advancements represent a significant breakthrough for the process of drug discovery against schistosomiasis in particular and can be extended to other helmintic diseases which together afflict a large part of humankind.
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Affiliation(s)
- Hyokyeong Lee
- Department of Computer Science, San Francisco State University, San Francisco, CA 94132, USA
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40
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Liu R, Dong HF, Jiang MS. Artemisinin: the gifts from traditional Chinese medicine not only for malaria control but also for schistosomiasis control. Parasitol Res 2011; 110:2071-4. [DOI: 10.1007/s00436-011-2707-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 10/14/2011] [Indexed: 11/28/2022]
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41
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Liu R, Dong HF, Guo Y, Zhao QP, Jiang MS. Efficacy of praziquantel and artemisinin derivatives for the treatment and prevention of human schistosomiasis: a systematic review and meta-analysis. Parasit Vectors 2011; 4:201. [PMID: 22004571 PMCID: PMC3207908 DOI: 10.1186/1756-3305-4-201] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2011] [Accepted: 10/17/2011] [Indexed: 01/08/2023] Open
Abstract
Background Praziquantel has been used as first-line drug for chemotherapy of schistosomiasis since 1984. Besides praziquantel, artemether and artesunate have also been used for the control of this infectious disease since late 1990s. In this article, we conducted a systematic review and meta-analysis to evaluate the antischistosomal efficacy of different medication strategies including monotherapy or combination therapies of these drugs. Results A number of 52 trials from 38 articles published in peer-reviewed journals before July 2011 were selected for analysis after searching the following literature databases: the Cochrane Library, PubMed/Medline, ISI Web of Science, Chinese Biomedicine Literature Database, and China National Knowledge Infrastructure. Our meta-analyses showed that a dosage of 30-60 mg/kg praziquantel compared with placebo produced a protection rate of about 76% (95% CI: 67%-83%) for treating human schistosomiasis, which varied from 70% to 76% with no significant differences among the subspecies S. haematobium, S. japonicum or S. mansoni. Protection rates were higher when praziquantel doses were elevated, as concluded from the nRCTs results: the protection rate of praziquantel at 40 mg/kg was 52% (95% CI: 49%-55%), and it increased to 91% (95% CI: 88%-92%) when the dosages were elevated to 60/80/100 mg/kg divided two or more doses. Multiple doses of artemether or artesunate over 1- or 2-week intervals resulted in protection rates of 65% to 97% for preventing schistosomiasis, and increased doses and shorter medication intervals improved their efficacies. Praziquantel and artemisinin derivatives (artemether or artesunate) in combination resulted in a higher protection rate of 84% (95% CI: 64%-91%) than praziquantel monotherapy for treatment. praziquantel and artesunate in combination had a great protection rate of 96% (95% CI: 78%-99%) for preventing schistosomes infection. Conclusions According to the results, praziquantel remains effective in schistosomiasis treatment, and multiple doses would improve its efficacy; meanwhile, praziquantel is also a good drug for preventing acute schistosomiasis morbidity. It's better to use multiple doses of artemether or artesunate with 1- or 2-week intervals for prevention against schistosome infection. Praziquantel and artemether or artesunate in combination perform better in treatment than praziquantel monotherapy, and they are especially suitable for treating the patients with repeated exposure to infected water.
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Affiliation(s)
- Rong Liu
- Department of Medical Parasitology, School of Basic Medical Science, Wuhan University, Wuhan 430071, People's Republic of China.
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Ultrastructural changes of adult Schistosoma mansoni worms recovered from C57BL/6 mice passively immunized with normal and vaccinated rabbit sera in vivo. Parasitol Res 2011; 110:37-47. [DOI: 10.1007/s00436-011-2448-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Accepted: 05/06/2011] [Indexed: 01/11/2023]
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Li HJ, Wang W, Qu GL, Tao YH, Xing YT, Li YZ, Wei JY, Dai JR, Liang YS. In-vivo activity of dihydroartemisinin against Schistosoma japonicum. ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY 2011; 105:181-5. [PMID: 21396254 PMCID: PMC4084662 DOI: 10.1179/136485911x12899838683287] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Revised: 12/03/2010] [Accepted: 12/09/2010] [Indexed: 12/28/2022]
Affiliation(s)
- H-J Li
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - W Wang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - G-L Qu
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - Y-H Tao
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - Y-T Xing
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - Y-Z Li
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - J-Y Wei
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - J-R Dai
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
| | - Y-S Liang
- Jiangsu Institute of Parasitic Diseases, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China, and, Key Laboratory on Technology for Parasitic Disease Prevention and Control, Ministry of Health, 117 Yangxiang, Meiyuan, Wuxi 214064, Jiangsu Province, China
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Is there reduced susceptibility to praziquantel in Schistosoma japonicum? Evidence from China. Parasitology 2011; 137:1905-12. [PMID: 20810006 DOI: 10.1017/s0031182010001204] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Praziquantel is widely used for the treatment of human schistosomiasis. However, in recent years, there has been increasing concern about the resistance of Schistosoma species to praziquantel. The study described here was designed to evaluate the current susceptibility to praziquantel in S. japonicum in China. During the non-transmission period of schistosomiasis, a random sample of 4760 subjects from the main endemic foci of China were examined using parasitological stool examination. In total, 584 subjects were identified as being infected with S. japonicum, with a prevalence rate of 12.27%. Among them, 565 stool-egg-positive subjects were treated with praziquantel in a single oral dose of 40 mg/kg. Six weeks post-treatment, among the 505 villagers re-examined, 480 (95.05%) had no detectable S. japonicum eggs. Twenty-one subjects still excreting eggs after the first treatment were treated with praziquantel for the second time. All stool samples, including those from those participants with second treatment were re-examined 6 weeks after the second treatment, and no stool-egg-positives were found. The results indicate that the current efficacy of praziquantel against S. japonicum is still high and has not changed after more than 2 decades of repeated, expanded chemotherapy in the main endemic areas of China. It is suggested that no evidence of tolerance or resistance to praziquantel in S. japonicum was detected in China.
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Clerinx J, Van Gompel A. Schistosomiasis in travellers and migrants. Travel Med Infect Dis 2011; 9:6-24. [DOI: 10.1016/j.tmaid.2010.11.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Revised: 11/09/2010] [Accepted: 11/18/2010] [Indexed: 02/07/2023]
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Pereira HM, Berdini V, Ferri MR, Cleasby A, Garratt RC. Crystal structure of Schistosoma purine nucleoside phosphorylase complexed with a novel monocyclic inhibitor. Acta Trop 2010; 114:97-102. [PMID: 20122887 DOI: 10.1016/j.actatropica.2010.01.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Revised: 12/18/2009] [Accepted: 01/01/2010] [Indexed: 10/19/2022]
Abstract
A novel inhibitor of Schistosoma PNP was identified using an "in silico" approach allied to enzyme inhibition assays. The compound has a monocyclic structure which has not been previously described for PNP inhibitors. The crystallographic structure of the complex was determined and used to elucidate the binding mode within the active site. Furthermore, the predicted pose was very similar to that determined crystallographically, validating the methodology. The compound Sm_VS1, despite its low molecular weight, possesses an IC(50) of 1.3 microM, surprisingly low when compared with purine analogues. This is presumably due to the formation of eight hydrogen bonds with key residues in the active site E203, N245 and T244. The results of this study highlight the importance of the use of multiple conformations for the target during virtual screening. Indeed the Sm_VS1 compound was only identified after flipping the N245 side chain. It is expected that the structure will be of use in the development of new highly active non-purine based compounds against the Schistosoma enzyme.
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Guidi A, Andolina C, Makame Ame S, Albonico M, Cioli D, Juma Haji H. Praziquantel efficacy and long-term appraisal of schistosomiasis control in Pemba Island. Trop Med Int Health 2010; 15:614-8. [PMID: 20214757 DOI: 10.1111/j.1365-3156.2010.02488.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To determine whether praziquantel (PZQ) has retained its efficacy against Schistosoma haematobium on Pemba Island after 20 years of mass administration--albeit discontinuous--and to analyse retrospectively the performance of schistosomiasis control programmes. METHODS A sample of Pemba schoolchildren was examined before and after PZQ treatment by urine filtration, macro- and micro-haematuria and viability of excreted eggs. RESULTS Although 5% of treated children continued to pass some eggs in the urine up to the seventh week after PZQ administration, none of these eggs was viable, indicating an effective schistosomicidal activity followed by a slow release of dead eggs from host tissues. CONCLUSION No signs of PZQ resistance could be detected in the population under study. An overall retrospective analysis of schistosomiasis control activities in Pemba Island revealed that mass drug administration is clearly effective in reducing infection prevalence, but soon after interruption of drug distribution prevalence returns rapidly to pre-intervention levels.
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Affiliation(s)
- A Guidi
- Institute of Cell Biology, National Research Council, Monterotondo, Rome, Italy
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Abstract
BACKGROUND There is an increasing number of imported cases of schistosomiasis in Europe, but there are only few studies on the efficacy of praziquantel for the treatment of schistosomiasis in non-endemic settings. METHODS Patients treated for schistosomiasis in 2003 to 2008 were offered reexamination with serology, eosinophil count, IgE, microscopy of 24 h urine samples and/or rectal biopsies >3 months after treatment. All patients had been treated with at least one dose of praziquantel 40 to 60 mg/kg >12 weeks after exposure and had not been reexposed to schistosomiasis after treatment. RESULTS Twenty-eight traveler (15 tourists and 13 expatriates) and two immigrants were reexamined after treatment. Viable ova were detected in six traveler (20%). Ova were found in 5/23 (22%) rectal biopsies and in 2/12 (17%) urine samples. Treatment failure was suspected in a symptomatic patient who 2 years after treatment had eightfold rise in antibody titer and elevated IgE but no detectable ova in urine or rectal biopsies. Additional 13 patients had one or more parameters, which could indicate persistent infection. There were no significant differences in eosinophil count, IgE or, change in antibody titer between patients with versus without detectable ova after treatment. CONCLUSIONS In traveler with a low parasite burden, assessment of treatment results can be difficult because of the low sensitivity of microscopy and persistence of antibodies for several years after treatment. We found a high rate of treatment failure among traveler, indicating that nonimmune patients may need more than the recommended single day of treatment for eradication of parasites. Until more sensitive and specific methods for detection of persistent, active infection are available, repeated treatment should be considered in patients with continuous symptoms or other indications of treatment failure even when viable ova cannot be detected by microscopy.
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Affiliation(s)
- Marie Helleberg
- Department of Infectious Diseases, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark.
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Thors C, Holmblad P, Maleki M, Carlson J, Linder E. Schistosomiasis in Swedish travellers to sub-Saharan Africa: can we rely on serology? ACTA ACUST UNITED AC 2009; 38:794-9. [PMID: 16938734 DOI: 10.1080/00365540600643195] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In the absence of egg excretion, laboratory diagnosis of recently acquired schistosomiasis is dependent on serology. 42 of 83 Swedish adventure tourists to sub-Saharan Africa had serum anti-schistosome antibodies indicating recent infection. There is little doubt regarding the specificity and sensitivity of serology for the demonstration of infection, but there is a need for alternative serological methods which could be more widely used than the standard immunofluorescence assay (IFA) for antibodies against gut-derived antigens (anti-GAA). We present results suggesting that 40/42 anti-GAA positive cases also react with keyhole limpet haemocyanin (KLH), a readily available commercial antigen. High anti-GAA titres were seen for more than 2 y despite treatment with praziquantel. Thus we are faced with several questions. How likely is it that positive serology means treatment failure? What is the risk involved in chronic infection? What is the prospect for monitoring treatment outcome by serology? We conclude that there is a need for better information on the risk of becoming infected, for improved methods for testing and for monitoring the therapeutic effects in adventure tourists.
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Affiliation(s)
- Cecilia Thors
- Clinic of Infectious Diseases, Västerås Central Hospital, Västerås, Sweden.
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Silva IMD, Pereira Filho E, Thiengo R, Ribeiro PC, Conceição MJ, Panasco M, Lenzi HL. Schistosomiasis haematobia: histopathological course determined by cystoscopy in a patient in whom praziquantel treatment failed. Rev Inst Med Trop Sao Paulo 2009; 50:343-6. [PMID: 19082376 DOI: 10.1590/s0036-46652008000600006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2008] [Accepted: 09/18/2008] [Indexed: 11/22/2022] Open
Abstract
Schistosomiasis haematobia or urinary schistosomiasis is one of the main public health problems in Africa and the Middle East. A single dose of 40 mg praziquantel per kg body weight continues to be the treatment of choice for this infection. The aims of this follow-up were to study the post-treatment course of a patient infected with S. haematobium and not submitted to re-exposure, and to identify complications of the disease and/or therapeutic failure after praziquantel treatment by histopathological analysis. Treatments were repeated under medical supervision to ensure the correct use of the drug. In view of the suspicion of lesions in cystoscopy, the patient was submitted to bladder biopsy. The histopathological characteristics observed in biopsies obtained, after each treatment, indicated viability of parasite eggs and activity of granulomas.
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Affiliation(s)
- Iran Mendonça da Silva
- Seção de Vigilância Epidemiológica, Subdivisão de Pesquisa, Divisão de Ensino e Pesquisa, Instituto de Biologia do Exército, Rio de Janeiro, RJ, Brasil
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