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https://www.readbyqxmd.com/read/29321371/assessing-drug-efficacy-against-plasmodium-falciparum-liver-stages-in-vivo
#1
Erika L Flannery, Lander Foquet, Vorada Chuenchob, Matthew Fishbaugher, Zachary Billman, Mary Jane Navarro, William Betz, Tayla M Olsen, Joshua Lee, Nelly Camargo, Thao Nguyen, Carola Schafer, Brandon K Sack, Elizabeth M Wilson, Jessica Saunders, John Bial, Brice Campo, Susan A Charman, Sean C Murphy, Margaret A Phillips, Stefan Hi Kappe, Sebastian A Mikolajczak
Malaria eradication necessitates new tools to fight the evolving and complex Plasmodium pathogens. These tools include prophylactic drugs that eliminate Plasmodium liver stages and consequently prevent clinical disease, decrease transmission, and reduce the propensity for resistance development. Currently, the identification of these drugs relies on in vitro P. falciparum liver stage assays or in vivo causal prophylaxis assays using rodent malaria parasites; there is no method to directly test in vivo liver stage activity of candidate antimalarials against the human malaria-causing parasite P...
January 11, 2018: JCI Insight
https://www.readbyqxmd.com/read/29310655/methylene-blue-induced-morphological-deformations-in-plasmodium-falciparum-gametocytes-implications-for-transmission-blocking
#2
Ishan Wadi, C Radhakrishna Pillai, Anupkumar R Anvikar, Abhinav Sinha, Mahendra Nath, Neena Valecha
BACKGROUND: Malaria remains a global health problem despite availability of effective tools. For malaria elimination, drugs targeting sexual stages of Plasmodium falciparum need to be incorporated in treatment regimen along with schizonticidal drugs to interrupt transmission. Primaquine is recommended as a transmission blocking drug for its effect on mature gametocytes but is not extensively utilized because of associated safety concerns among glucose-6-phosphate dehydrogenase (G6PD) deficient patients...
January 8, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29305344/review-and-drug-therapy-implications-of-glucose-6-phosphate-dehydrogenase-deficiency
#3
REVIEW
Kristen D Belfield, Eric M Tichy
PURPOSE: The pathophysiology, diagnosis, and medication-use implications of glucose-6-phosphate dehydrogenase (G6PD) deficiency, the most common enzyme deficiency in humans, are reviewed. SUMMARY: Originally identified as favism in patients who experienced hemolysis after ingestion of fava beans, G6PD deficiency results from an X-linked chromosomal mutation that leads to reduced activity of the enzyme responsible for the final step of the pentose phosphate pathway, through which reduced nicotinamide adenine dinucleotide phosphate required for protection of cells from oxidative stress is produced...
January 5, 2018: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/29216842/a-clinical-tool-to-predict-plasmodium-vivax-recurrence-in-malaysia
#4
Norliza Mat Ariffin, Farida Islahudin, Endang Kumolosasi, Mohd Makmor-Bakry
BACKGROUND: Recurrence rates of Plasmodium vivax infections differ across various geographic regions. Interestingly, South-East Asia and the Asia-Pacific region are documented to exhibit the most frequent recurrence incidences. Identifying patients at a higher risk for recurrences gives valuable information in strengthening the efforts to control P. vivax infections. The aim of the study was to develop a tool to identify P. vivax- infected patients that are at a higher risk of recurrence in Malaysia...
December 8, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29169341/prevalence-genetic-variants-and-clinical-implications-of-g-6-pd-deficiency-in-burkina-faso-a-systematic-review
#5
Abdoul Karim Ouattara, Pouiré Yameogo, Lassina Traore, Birama Diarra, Maléki Assih, Tegwindé Rébéca Compaore, Dorcas Obiri-Yeboah, Serge Théophile Soubeiga, Florencia Wendkuuni Djigma, Jacques Simpore
BACKGROUND: It is now well-known that some antimalarials such as primaquine may induce severe hemolytic anemia in people with G-6-PD deficiency. Antimalarial drug prescriptions must, therefore take into account the patient's G-6-PD status in malaria endemic areas such as Burkina Faso, where the prevalence of this genetic abnormality is relatively high. Although great clinical heterogeneity is observed depending on the molecular nature of the deficiency and the residual enzyme activity in the red blood cell, there is very poor data on the prevalence of G-6-PD deficiency and the distribution of involved genetic variants in Burkina Faso...
November 23, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/29121061/a-randomized-double-blind-active-control-trial-to-evaluate-the-efficacy-and-safety-of-a-three-day-course-of-tafenoquine-monotherapy-for-the-treatment-of-plasmodium-vivax-malaria
#6
Mark M Fukuda, Srivicha Krudsood, Khadeeja Mohamed, Justin A Green, Sukhuma Warrasak, Harald Noedl, Ataya Euswas, Mali Ittiverakul, Nillawan Buathong, Sabaithip Sriwichai, R Scott Miller, Colin Ohrt
BACKGROUND: Tafenoquine is an investigational 8-aminoquinoline for the prevention of Plasmodium vivax relapse. Tafenoquine has a long half-life and the potential for more convenient dosing, compared with the currently recommended 14-day primaquine regimen. METHODS: This randomized, active-control, double-blind trial was conducted in Bangkok, Thailand. Seventy patients with microscopically confirmed P. vivax were randomized (2:1) to tafenoquine 400 mg once daily for 3 days or 2500 mg total dose chloroquine phosphate (1500 mg chloroquine base) given over 3 days plus primaquine 15 mg daily for 14 days...
2017: PloS One
https://www.readbyqxmd.com/read/29082022/systematic-review-of-the-clinical-manifestations-of-glucose-6-phosphate-dehydrogenase-deficiency-in-the-greater-mekong-subregion-implications-for-malaria-elimination-and-beyond
#7
Ken Ing Cherng Ong, Hodaka Kosugi, Sophea Thoeun, Hitomi Araki, Moe Moe Thandar, Moritoshi Iwagami, Bouasy Hongvanthong, Paul T Brey, Shigeyuki Kano, Masamine Jimba
INTRODUCTION: To achieve malaria elimination in the Greater Mekong Subregion (GMS) by 2030, proper case management is necessary. 8-aminoquinolines, such as primaquine, are the only available medicines effective in preventing relapse of the hypnozoite stage of Plasmodium vivax, as well as the onward transmission of Plasmodium falciparum. However, primaquine can cause haemolysis in individuals who have glucose-6-phosphate dehydrogenase deficiency (G6PDd). We conducted a systematic review on the reported clinical manifestations of G6PDd to provide a comprehensive overview of the situation in the GMS...
2017: BMJ Global Health
https://www.readbyqxmd.com/read/29016333/distribution-of-mutations-associated-with-antifolate-and-chloroquine-resistance-among-imported-plasmodium-vivax-in-the-state-of-qatar
#8
Devendra Bansal, Anushree Acharya, Praveen K Bharti, Mohamed H Abdelraheem, Ashraf Elmalik, Salem Abosalah, Fahmi Y Khan, Mohamed ElKhalifa, Hargobinder Kaur, Pradyumna K Mohapatra, Rakesh Sehgal, Mohammed A Idris, Jagadish Mahanta, Neeru Singh, Hamza A Babiker, Ali A Sultan
Plasmodium vivax is the most prevalent parasite worldwide, escalating by spread of drug resistance. Currently, in Qatar, chloroquine (CQ) plus primaquine are recommended for the treatment of P. vivax malaria. The present study examined the prevalence of mutations in dihydrofolate reductase (dhfr), dihydropteroate synthase (dhps) genes and CQ resistance transporter (crt-o) genes, associated with sulphadoxine-pyrimethamine (SP) and chloroquine resistance, among imported P. vivax cases in Qatar. Blood samples were collected from patients positive for P...
October 2, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28886443/antiplasmodial-activities-of-dyes-against-plasmodium-falciparum-asexual-and-sexual-stages-contrasted-uptakes-of-triarylmethanes-brilliant-green-green-s-e142-and-patent-blue-v-e131-by-erythrocytes
#9
Louis-Jérôme Leba, Jean Popovici, Yannick Estevez, Stéphane Pelleau, Eric Legrand, Lise Musset, Christophe Duplais
The search for safe antimalarial compounds acting against asexual symptom-responsible stages and sexual transmission-responsible forms of Plasmodium species is one of the major challenges in malaria elimination programs. So far, among current drugs approved for human use, only primaquine has transmission-blocking activity. The discovery of small molecules targeting different Plasmodium falciparum life stages remains a priority in antimalarial drug research. In this context, several independent studies have recently reported antiplasmodial and transmission-blocking activities of commonly used stains, dyes and fluorescent probes against P...
August 2, 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28883977/management-of-plasmodium-vivax-risk-and-illness-in-travelers
#10
EDITORIAL
J Kevin Baird
Malaria poses an exceptionally complex problem for providers of travel medicine services. Perceived high risk of exposure during travel typically prompts prescribing protective antimalarial drugs. Suppressive chemoprophylactic agents have dominated strategy for that practice for over 70 years. This broad class of therapeutic agents kills parasites after they emerge from the liver and attempt development in red blood cells. The dominance of suppressive chemoprophylaxis in travel medicine stems largely from the view of Plasmodium falciparum as the utmost threat to the patient - these drugs are poorly suited to preventing Plasmodium vivax and Plasmodium ovale due to inactivity against the latent liver stages of these species not produced by P...
2017: Tropical Diseases, Travel Medicine and Vaccines
https://www.readbyqxmd.com/read/28862132/the-complex-relationship-of-exposure-to-new-plasmodium-infections-and-incidence-of-clinical-malaria-in-papua-new-guinea
#11
Natalie E Hofmann, Stephan Karl, Rahel Wampfler, Benson Kiniboro, Albina Teliki, Jonah Iga, Andreea Waltmann, Inoni Betuela, Ingrid Felger, Leanne J Robinson, Ivo Mueller
The molecular force of blood-stage infection (molFOB) is a quantitative surrogate metric for malaria transmission at population level and for exposure at individual level. Relationships between molFOB, parasite prevalence and clinical incidence were assessed in a treatment-to-reinfection cohort, where P.vivax (Pv) hypnozoites were eliminated in half the children by primaquine (PQ). Discounting relapses, children acquired equal numbers of new P. falciparum (Pf) and Pv blood-stage infections/year (Pf-molFOB = 0-18, Pv-molFOB = 0-23) resulting in comparable spatial and temporal patterns in incidence and prevalence of infections...
September 1, 2017: ELife
https://www.readbyqxmd.com/read/28857064/implementation-of-g6pd-testing-and-primaquine-for-p-vivax-radical-cure-operational-perspectives-from-thailand-and-cambodia
#12
Suravadee Kitchakarn, Dysoley Lek, Sea Thol, Chantheasy Hok, Aungkana Saejeng, Rekol Huy, Nipon Chinanonwait, Krongthong Thimasarn, Chansuda Wongsrichanalai
Following progressive success in reducing the burden of malaria over the past two decades, countries of the Asia Pacific are now aiming for elimination of malaria by 2030. Plasmodium falciparum and Plasmodium vivax are the two main malaria species that are endemic in the region. P. vivax is generally perceived to be less severe but will be harder to eliminate, owing partly to its dormant liver stage (known as a hypnozoite) that can cause multiple relapses following an initial clinical episode caused by a mosquito-borne infection...
September 2017: WHO South-East Asia Journal of Public Health
https://www.readbyqxmd.com/read/28826608/high-throughput-multiplex-genotyping-directly-from-blood-or-dried-blood-spot-without-dna-extraction-for-the-screening-of-multiple-g6pd-gene-variants-at-risk-for-drug-induced-hemolysis
#13
Xiaoyi Tian, Jun Zhou, Ye Zhao, Zhibin Cheng, Wenqi Song, Yu Sun, Xiaodong Sun, Zhi Zheng
Clinical or epidemiologic screening of single-nucleotide polymorphism markers requires large-scale multiplexed genotyping. Available genotyping tools require DNA extraction and multiplex PCR, which may limit throughput and suffer amplification bias. Herein, a novel genotyping approach has been developed, multiplex extension and ligation-based probe amplification (MELPA), which eliminates DNA extraction and achieves uniform PCR amplification. MELPA lyses blood or dried blood spot and directly captures specific target DNA to 96-well plates using tailed probes...
September 2017: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28749756/efficacy-of-different-primaquine-regimens-to-control-plasmodium-falciparum-gametocytemia-in-colombia
#14
Maria Arroyo-Arroyo, Eliana Arango, Jaime Carmona-Fonseca, Beatriz Aristizabal, Stephanie Yanow, Amanda Maestre
Treatment against Plasmodium falciparum malaria includes blood schizonticides to clear asexual parasites responsible for disease. The addition of gametocytocidal drugs can eliminate infectious sexual stages with potential for transmission and the World Health Organization recommends a single dose (SD) of primaquine (PQ) to this end. The efficacy of PQ at 0.75 mg/kg to suppress gametocytemia when administered in single or fractionated doses was evaluated. A clinical controlled study with an open-label design was executed; three groups of 20 subjects were studied sequentially...
September 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28619120/g6pd-deficiency-alleles-in-a-malaria-endemic-region-in-the-western-brazilian-amazon
#15
Jamille G Dombrowski, Rodrigo M Souza, Jonathan Curry, Laura Hinton, Natercia R M Silva, Lynn Grignard, Ligia A Gonçalves, Ana Rita Gomes, Sabrina Epiphanio, Chris Drakeley, Jim Huggett, Taane G Clark, Susana Campino, Claudio R F Marinho
BACKGROUND: Plasmodium vivax parasites are the predominant cause of malaria infections in the Brazilian Amazon. Infected individuals are treated with primaquine, which can induce haemolytic anaemia in glucose-6-phosphate dehydrogenase (G6PD)-deficient individuals and may lead to severe and fatal complications. This X-linked disorder is distributed globally and is caused by allelic variants with a geographical distribution that closely reflects populations exposed historically to endemic malaria...
June 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28606284/-efficacy-of-clindamycin-primaquine-as-the-salvage-treatment-for-pneumocystis-pneumonia-in-non-hiv-infected-patients
#16
X Wang, G F Wang, Z Jin, J J Huang, X D Mu, W Zhang
Objective: To evaluate the efficacy of clindamycin-primaquine as the salvage treatment for pneumocystis pneumonia (PCP) in non-HIV-infected patients. Methods: Clinical data of non-HIV-infected patients with PCP who were treated with clindamycin-primaquine as the salvage treatment in Peking University First Hospital from Jan 2010 to May 2016 were collected and reviewed in this retrospective study. Clinical outcomes were analyzed to evaluate the efficacy of clindamycin-primaquine as a salvage treatment. Results: A total of 19 non-HIV-infected patients with PCP were included...
June 13, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28533239/plasmodium-falciparum-and-plasmodium-vivax-demonstrate-contrasting-chloroquine-resistance-reversal-phenotypes
#17
Grennady Wirjanata, Irene Handayuni, Pak Prayoga, Leo Leonardo, Dwi Apriyanti, Leily Trianty, Ruland Wandosa, Basbak Gobay, Enny Kenangalem, Jeanne Rini Poespoprodjo, Rintis Noviyanti, Dennis E Kyle, Qin Cheng, Ric N Price, Jutta Marfurt
High-grade chloroquine (CQ) resistance has emerged in both Plasmodium falciparum and P. vivax The aim of the present study was to investigate the phenotypic differences of CQ resistance in both of these species and the ability of known CQ resistance reversal agents (CQRRAs) to alter CQ susceptibility. Between April 2015 and April 2016, the potential of verapamil (VP), mibefradil (MF), L703,606 (L7), and primaquine (PQ) to reverse CQ resistance was assessed in 46 P. falciparum and 34 P. vivax clinical isolates in Papua, Indonesia, where CQ resistance is present in both species, using a modified schizont maturation assay...
August 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28417346/-role-of-primaquine-in-malaria-control-and-elimination-in-french-speaking-africa
#18
S Briolant, B Pradines, L K Basco
Primaquine, an 8-aminoquinoline, is a relatively unknown and underutilized drug in French-speaking African countries. It acts against the liver stage parasites of all human malaria species, asexual blood stages of Plasmodium vivax and, to a lesser degree, Plasmodium falciparum; P. falciparum mature gametocytes, and P. vivax and Plasmodium ovale hypnozoites. Gastrointestinal disturbances are its most common side effects. The clinical utility of primaquine is limited due to its hematological side effects in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency and other contraindications (pregnant woman, breastfeeding woman, infants less than 6 months old)...
April 17, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28384505/the-vivax-surveyor-online-mapping-database-for-plasmodium-vivax-clinical-trials
#19
REVIEW
R J Commons, K Thriemer, G Humphreys, I Suay, C H Sibley, P J Guerin, R N Price
INTRODUCTION: Recurrent P. vivax infections are associated with significant morbidity and mortality. Although radical cure can reduce recurrent infection, it is confounded by antimalarial resistance and the lack of safe and effective hypnozoitocidal treatment. This study documents the available literature of published clinical trials of P. vivax, providing an up to date, online, open access tool to view and download available information. METHODS: A systematic review was conducted according to PRISMA guidelines to identify prospective P...
August 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28381261/challenges-for-achieving-safe-and-effective-radical-cure-of-plasmodium-vivax-a-round-table-discussion-of-the-apmen-vivax-working-group
#20
REVIEW
Kamala Thriemer, Benedikt Ley, Albino Bobogare, Lek Dysoley, Mohammad Shafiul Alam, Ayodhia P Pasaribu, Jetsumon Sattabongkot, Elodie Jambert, Gonzalo J Domingo, Robert Commons, Sarah Auburn, Jutta Marfurt, Angela Devine, Mohammad M Aktaruzzaman, Nayeem Sohel, Rinzin Namgay, Tobgyel Drukpa, Surender Nath Sharma, Elvieda Sarawati, Iriani Samad, Minerva Theodora, Simone Nambanya, Sonesay Ounekham, Rose Nanti Binti Mudin, Garib Da Thakur, Leo Sora Makita, Raffy Deray, Sang-Eun Lee, Leonard Boaz, Manjula N Danansuriya, Santha D Mudiyanselage, Nipon Chinanonwait, Suravadee Kitchakarn, Johnny Nausien, Esau Naket, Thang Ngo Duc, Ha Do Manh, Young S Hong, Qin Cheng, Jack S Richards, Rita Kusriastuti, Ari Satyagraha, Rintis Noviyanti, Xavier C Ding, Wasif Ali Khan, Ching Swe Phru, Zhu Guoding, Gao Qi, Akira Kaneko, Olivo Miotto, Wang Nguitragool, Wanlapa Roobsoong, Katherine Battle, Rosalind E Howes, Arantxa Roca-Feltrer, Stephan Duparc, Ipsita Pal Bhowmick, Enny Kenangalem, Jo-Anne Bibit, Alyssa Barry, David Sintasath, Rabindra Abeyasinghe, Carol H Sibley, James McCarthy, Lorenz von Seidlein, J Kevin Baird, Ric N Price
The delivery of safe and effective radical cure for Plasmodium vivax is one of the greatest challenges for achieving malaria elimination from the Asia-Pacific by 2030. During the annual meeting of the Asia Pacific Malaria Elimination Network Vivax Working Group in October 2016, a round table discussion was held to discuss the programmatic issues hindering the widespread use of primaquine (PQ) radical cure. Participants included 73 representatives from 16 partner countries and 33 institutional partners and other research institutes...
April 5, 2017: Malaria Journal
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