Malaria in Pregnancy: the Relevance of Animal Models for Vaccine Development Justin Doritchamou, Andrew Teo, Michal Fried & Patrick E Duffy
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Molecular Data and the Evolutionary History of Dinoflagellates by Juan Fernando Saldarriaga Echavarria Diplom, Ruprecht-Karls-Un
Molecular data and the evolutionary history of dinoflagellates by Juan Fernando Saldarriaga Echavarria Diplom, Ruprecht-Karls-Universitat Heidelberg, 1993 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE STUDIES Department of Botany We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA November 2003 © Juan Fernando Saldarriaga Echavarria, 2003 ABSTRACT New sequences of ribosomal and protein genes were combined with available morphological and paleontological data to produce a phylogenetic framework for dinoflagellates. The evolutionary history of some of the major morphological features of the group was then investigated in the light of that framework. Phylogenetic trees of dinoflagellates based on the small subunit ribosomal RNA gene (SSU) are generally poorly resolved but include many well- supported clades, and while combined analyses of SSU and LSU (large subunit ribosomal RNA) improve the support for several nodes, they are still generally unsatisfactory. Protein-gene based trees lack the degree of species representation necessary for meaningful in-group phylogenetic analyses, but do provide important insights to the phylogenetic position of dinoflagellates as a whole and on the identity of their close relatives. Molecular data agree with paleontology in suggesting an early evolutionary radiation of the group, but whereas paleontological data include only taxa with fossilizable cysts, the new data examined here establish that this radiation event included all dinokaryotic lineages, including athecate forms. Plastids were lost and replaced many times in dinoflagellates, a situation entirely unique for this group. Histones could well have been lost earlier in the lineage than previously assumed. -
Malaria Plasmodium Chabaudi Against Blood-Stage Long-Term Strain
IFN- −γ Induced Priming Maintains Long-Term Strain-Transcending Immunity against Blood-Stage Plasmodium chabaudi Malaria This information is current as of September 25, 2021. Henrique Borges da Silva, Érika Machado de Salles, Raquel Hoffmann Panatieri, Silvia Beatriz Boscardin, Sérgio Marcelo Rodríguez-Málaga, José Maria Álvarez and Maria Regina D'Império Lima J Immunol 2013; 191:5160-5169; Prepublished online 16 Downloaded from October 2013; doi: 10.4049/jimmunol.1300462 http://www.jimmunol.org/content/191/10/5160 http://www.jimmunol.org/ Supplementary http://www.jimmunol.org/content/suppl/2013/10/16/jimmunol.130046 Material 2.DC1 References This article cites 46 articles, 12 of which you can access for free at: http://www.jimmunol.org/content/191/10/5160.full#ref-list-1 by guest on September 25, 2021 Why The JI? Submit online. • Rapid Reviews! 30 days* from submission to initial decision • No Triage! Every submission reviewed by practicing scientists • Fast Publication! 4 weeks from acceptance to publication *average Subscription Information about subscribing to The Journal of Immunology is online at: http://jimmunol.org/subscription Permissions Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html Email Alerts Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts The Journal of Immunology is published twice each month by The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 2013 by The -
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1 Exploring the male-induced female reproduction of Schistosoma mansoni in a novel medium Jipeng Wang1, Rui Chen1, James Collins1 1) UT Southwestern Medical Center. Schistosomiasis is a neglected tropical disease caused by schistosome parasites that infect over 200 million people. The prodigious egg output of these parasites is the sole driver of pathology due to infection. Female schistosomes rely on continuous pairing with male worms to fuel the maturation of their reproductive organs, yet our understanding of their sexual reproduction is limited because egg production is not sustained for more than a few days in vitro. Here, we explore the process of male-stimulated female maturation in our newly developed ABC169 medium and demonstrate that physical contact with a male worm, and not insemination, is sufficient to induce female development and the production of viable parthenogenetic haploid embryos. By performing an RNAi screen for genes whose expression was enriched in the female reproductive organs, we identify a single nuclear hormone receptor that is required for differentiation and maturation of germ line stem cells in female gonad. Furthermore, we screen genes in non-reproductive tissues that maybe involved in mediating cell signaling during the male-female interplay and identify a transcription factor gli1 whose knockdown prevents male worms from inducing the female sexual maturation while having no effect on male:female pairing. Using RNA-seq, we characterize the gene expression changes of male worms after gli1 knockdown as well as the female transcriptomic changes after pairing with gli1-knockdown males. We are currently exploring the downstream genes of this transcription factor that may mediate the male stimulus associated with pairing. -
Real-Time Dynamics of Plasmodium NDC80 Reveals Unusual Modes of Chromosome Segregation During Parasite Proliferation Mohammad Zeeshan1,*, Rajan Pandey1,*, David J
© 2020. Published by The Company of Biologists Ltd | Journal of Cell Science (2021) 134, jcs245753. doi:10.1242/jcs.245753 RESEARCH ARTICLE SPECIAL ISSUE: CELL BIOLOGY OF HOST–PATHOGEN INTERACTIONS Real-time dynamics of Plasmodium NDC80 reveals unusual modes of chromosome segregation during parasite proliferation Mohammad Zeeshan1,*, Rajan Pandey1,*, David J. P. Ferguson2,3, Eelco C. Tromer4, Robert Markus1, Steven Abel5, Declan Brady1, Emilie Daniel1, Rebecca Limenitakis6, Andrew R. Bottrill7, Karine G. Le Roch5, Anthony A. Holder8, Ross F. Waller4, David S. Guttery9 and Rita Tewari1,‡ ABSTRACT eukaryotic organisms to proliferate, propagate and survive. During Eukaryotic cell proliferation requires chromosome replication and these processes, microtubular spindles form to facilitate an equal precise segregation to ensure daughter cells have identical genomic segregation of duplicated chromosomes to the spindle poles. copies. Species of the genus Plasmodium, the causative agents of Chromosome attachment to spindle microtubules (MTs) is malaria, display remarkable aspects of nuclear division throughout their mediated by kinetochores, which are large multiprotein complexes life cycle to meet some peculiar and unique challenges to DNA assembled on centromeres located at the constriction point of sister replication and chromosome segregation. The parasite undergoes chromatids (Cheeseman, 2014; McKinley and Cheeseman, 2016; atypical endomitosis and endoreduplication with an intact nuclear Musacchio and Desai, 2017; Vader and Musacchio, 2017). Each membrane and intranuclear mitotic spindle. To understand these diverse sister chromatid has its own kinetochore, oriented to facilitate modes of Plasmodium cell division, we have studied the behaviour movement to opposite poles of the spindle apparatus. During and composition of the outer kinetochore NDC80 complex, a key part of anaphase, the spindle elongates and the sister chromatids separate, the mitotic apparatus that attaches the centromere of chromosomes to resulting in segregation of the two genomes during telophase. -
Looking Under the Skin: the First Steps in Malarial Infection and Immunity
REVIEWS Looking under the skin: the first steps in malarial infection and immunity Robert Ménard1, Joana Tavares1, Ian Cockburn2, Miles Markus3, Fidel Zavala4 and Rogerio Amino1 Abstract | Malaria, which is caused by Plasmodium spp., starts with an asymptomatic phase, during which sporozoites, the parasite form that is injected into the skin by a mosquito, develop into merozoites, the form that infects erythrocytes. This pre-erythrocytic phase is still the most enigmatic in the parasite life cycle, but has long been recognized as an attractive vaccination target. In this Review, we present what has been learned in recent years about the natural history of the pre-erythrocytic stages, mainly using intravital imaging in rodents. We also consider how this new knowledge is in turn changing our understanding of the immune response mounted by the host against the pre-erythrocytic forms. Sterilizing immunity Malaria is the most deadly parasitic infection of humans. subject of intensive immunological research ever since Immunity resulting in parasite Although economic development and the implementa- the first demonstrations, in animal models and humans, clearance from the host. tion of control measures during the twentieth century that injection of attenuated parasites which do not cause have eliminated malaria from many areas of the world1, blood infection confers protection against sporozoite the disease is still rampant in the tropics and in the poor- challenge4–6. Today, this vaccination method is still 1Institut Pasteur, Unité de est regions of the globe, affecting 3 billion people and the most efficient at offering sterilizing immunity against Biologie et Génétique du 2 Paludisme, 28 Rue du Dr Roux, killing up to 1 million annually . -
Chromerid Genomes Reveal the Evolutionary Path From
RESEARCH ARTICLE elifesciences.org Chromerid genomes reveal the evolutionary path from photosynthetic algae to obligate intracellular parasites Yong H Woo1*, Hifzur Ansari1,ThomasDOtto2, Christen M Klinger3†, Martin Kolisko4†, Jan Michalek´ 5,6†, Alka Saxena1†‡, Dhanasekaran Shanmugam7†, Annageldi Tayyrov1†, Alaguraj Veluchamy8†§, Shahjahan Ali9¶,AxelBernal10,JavierdelCampo4, Jaromır´ Cihla´ rˇ5,6, Pavel Flegontov5,11, Sebastian G Gornik12,EvaHajduskovˇ a´ 5, AlesHorˇ ak´ 5,6,JanJanouskovecˇ 4, Nicholas J Katris12,FredDMast13,DiegoMiranda- Saavedra14,15, Tobias Mourier16, Raeece Naeem1,MridulNair1, Aswini K Panigrahi9, Neil D Rawlings17, Eriko Padron-Regalado1, Abhinay Ramaprasad1, Nadira Samad12, AlesTomˇ calaˇ 5,6, Jon Wilkes18,DanielENeafsey19, Christian Doerig20, Chris Bowler8, 4 10 3 21,22 *For correspondence: yong. Patrick J Keeling , David S Roos ,JoelBDacks, Thomas J Templeton , 12,23 5,6,24 5,6,25 1 [email protected] (YHW); arnab. Ross F Waller , Julius Lukesˇ , Miroslav Obornık´ ,ArnabPain* [email protected] (AP) 1Pathogen Genomics Laboratory, Biological and Environmental Sciences and Engineering † These authors contributed Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia; equally to this work 2Parasite Genomics, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Present address: ‡Vaccine and Cambridge, United Kingdom; 3Department of Cell Biology, University of Alberta, Infectious Disease Division, Fred Edmonton, Canada; 4Canadian Institute for Advanced Research, Department of Botany, -
Sex Ratios in the Rodent Malaria Parasite, Plasmodium Chabaudi
419 Sex ratios in the rodent malaria parasite, Plasmodium chabaudi S. E. REECE*, A. B. DUNCAN, S. A. WEST and A. F. READ Institute of Cell, Animal and Population Biology, Ashworth Laboratories, West Mains Road, University of Edinburgh, Edinburgh EH9 3JT, UK (Received 30 January 2003; revised 3 June 2003; accepted 10 June 2003) SUMMARY The sex ratios of malaria and related Apicomplexan parasites play a major role in transmission success. Here, we address 2 fundamental issues in the sex ratios of the rodent malaria parasite, Plasmodium chabaudi. First we test the accuracy of empirical methods for estimating sex ratios in malaria parasites, and show that sex ratios made with standard thin smears may overestimate the proportion of female gametocytes. Secondly, we test whether the mortality rate differs between male and female gametocytes, as assumed by sex ratio theory. Conventional application of sex ratio theory to malaria parasites assumes that the primary sex ratio can be accurately determined from mature gametocytes circulating in the peripheral circulation. We stopped gametocyte production with chloroquine in order to study a cohort of gametocytes in vitro. The mortality rate was significantly higher for female gametocytes, with an average half-life of 8 h for female gametocytes and 16 h for male gametocytes. Key words: sex allocation theory, gametocyte, mortality, blood smears. INTRODUCTION ratio (r*), should be related to the inbreeding rate by the equation r* (1–F)/2, where F is Wrights co- In order for malaria parasites to transmit to new ver- = efficient of inbreeding (the probability that 2 hom- tebrate hosts, a round of sexual reproduction must ologous genes in 2 mating gametes are identical by be undertaken in the mosquito vector. -
Impact of Babesia Microti Infection on the Initiation and Course Of
Tołkacz et al. Parasites Vectors (2021) 14:132 https://doi.org/10.1186/s13071-021-04638-0 Parasites & Vectors RESEARCH Open Access Impact of Babesia microti infection on the initiation and course of pregnancy in BALB/c mice Katarzyna Tołkacz1,2*, Anna Rodo3, Agnieszka Wdowiarska4, Anna Bajer1† and Małgorzata Bednarska5† Abstract Background: Protozoa in the genus Babesia are transmitted to humans through tick bites and cause babesiosis, a malaria-like illness. Vertical transmission of Babesia spp. has been reported in mammals; however, the exact timing and mechanisms involved are not currently known. The aims of this study were to evaluate the success of vertical transmission of B. microti in female mice infected before pregnancy (mated during the acute or chronic phases of Babesia infection) and that of pregnant mice infected during early and advanced pregnancy; to evaluate the pos- sible infuence of pregnancy on the course of parasite infections (parasitaemia); and to assess pathological changes induced by parasitic infection. Methods: The frst set of experiments involved two groups of female mice infected with B. microti before mating, and inseminated on the 7th day and after the 40th day post infection. A second set of experiments involved female mice infected with B. microti during pregnancy, on the 4th and 12th days of pregnancy. Blood smears and PCR targeting the 559 bp 18S rRNA gene fragment were used for the detection of B. microti. Pathology was assessed histologically. Results: Successful development of pregnancy was recorded only in females mated during the chronic phase of infection. The success of vertical transmission of B. -
The Kinetics of Cellular and Humoral Immune Responses of Common Carp to Presporogonic Development of the Myxozoan Sphaerospora Molnari Tomáš Korytář1,2, Geert F
Korytář et al. Parasites Vectors (2019) 12:208 https://doi.org/10.1186/s13071-019-3462-3 Parasites & Vectors RESEARCH Open Access The kinetics of cellular and humoral immune responses of common carp to presporogonic development of the myxozoan Sphaerospora molnari Tomáš Korytář1,2, Geert F. Wiegertjes3, Eliška Zusková2, Anna Tomanová4, Martina Lisnerová1,4, Sneha Patra1, Viktor Sieranski4,5, Radek Šíma1, Ana Born‑Torrijos1, Annelieke S. Wentzel6, Sandra Blasco‑Monleon1, Carlos Yanes‑Roca2, Tomáš Policar2 and Astrid S. Holzer1* Abstract Background: Sphaerospora molnari is a myxozoan parasite causing skin and gill sphaerosporosis in common carp (Cyprinus carpio) in central Europe. For most myxozoans, little is known about the early development and the expan‑ sion of the infection in the fsh host, prior to spore formation. A major reason for this lack of information is the absence of laboratory model organisms, whose life‑cycle stages are available throughout the year. Results: We have established a laboratory infection model for early proliferative stages of myxozoans, based on separation and intraperitoneal injection of motile and dividing S. molnari stages isolated from the blood of carp. In the present study we characterize the kinetics of the presporogonic development of S. molnari, while analyzing cellular host responses, cytokine and systemic immunoglobulin expression, over a 63‑day period. Our study shows activation of innate immune responses followed by B cell‑mediated immune responses. We observed rapid parasite efux from the peritoneal cavity (< 40 hours), an initial covert infection period with a moderate proinfammatory response for about 1–2 weeks, followed by a period of parasite multiplication in the blood which peaked at 28 days post‑infection (dpi) and was associated with a massive lymphocyte response. -
New Phylogenomic Analysis of the Enigmatic Phylum Telonemia Further Resolves the Eukaryote Tree of Life
bioRxiv preprint doi: https://doi.org/10.1101/403329; this version posted August 30, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. New phylogenomic analysis of the enigmatic phylum Telonemia further resolves the eukaryote tree of life Jürgen F. H. Strassert1, Mahwash Jamy1, Alexander P. Mylnikov2, Denis V. Tikhonenkov2, Fabien Burki1,* 1Department of Organismal Biology, Program in Systematic Biology, Uppsala University, Uppsala, Sweden 2Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Yaroslavl Region, Russia *Corresponding author: E-mail: [email protected] Keywords: TSAR, Telonemia, phylogenomics, eukaryotes, tree of life, protists bioRxiv preprint doi: https://doi.org/10.1101/403329; this version posted August 30, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. Abstract The broad-scale tree of eukaryotes is constantly improving, but the evolutionary origin of several major groups remains unknown. Resolving the phylogenetic position of these ‘orphan’ groups is important, especially those that originated early in evolution, because they represent missing evolutionary links between established groups. Telonemia is one such orphan taxon for which little is known. The group is composed of molecularly diverse biflagellated protists, often prevalent although not abundant in aquatic environments. -
Parasite, Plasmodium Berghei
Wild Anopheles funestus Mosquito Genotypes Are Permissive for Infection with the Rodent Malaria Parasite, Plasmodium berghei Jiannong Xu1,2,3., Julia´n F. Hillyer2,4., Boubacar Coulibaly5, Madjou Sacko5, Adama Dao5, Oumou Niare´ 5, Michelle M. Riehle2, Sekou F. Traore´ 5, Kenneth D. Vernick1,2* 1 Unit of Insect Vector Genetics and Genomics, Department of Parasitology and Mycology, Institut Pasteur, Paris, France, 2 Microbial and Plant Genomics Institute, Department of Microbiology, University of Minnesota, Saint Paul, Minnesota, United States of America, 3 Department of Biology, New Mexico State University, Las Cruces, New Mexico, United States of America, 4 Department of Biological Sciences and Institute for Global Health, Vanderbilt University, Nashville, Tennessee, United States of America, 5 Malaria Research and Training Center, University of Bamako, Bamako, Mali Abstract Background: Malaria parasites undergo complex developmental transitions within the mosquito vector. A commonly used laboratory model for studies of mosquito-malaria interaction is the rodent parasite, P. berghei. Anopheles funestus is a major malaria vector in sub-Saharan Africa but has received less attention than the sympatric species, Anopheles gambiae. The imminent completion of the A. funestus genome sequence will provide currently lacking molecular tools to describe malaria parasite interactions in this mosquito, but previous reports suggested that A. funestus is not permissive for P. berghei development. Methods: An A. funestus population was generated in the laboratory by capturing female wild mosquitoes in Mali, allowing them to oviposit, and rearing the eggs to adults. These F1 progeny of wild mosquitoes were allowed to feed on mice infected with a fluorescent P. berghei strain. -
Species-Specific Escape of Plasmodium Sporozoites From
Orfano et al. Malar J (2016) 15:394 DOI 10.1186/s12936-016-1451-y Malaria Journal RESEARCH Open Access Species‑specific escape of Plasmodium sporozoites from oocysts of avian, rodent, and human malarial parasites Alessandra S. Orfano1, Rafael Nacif‑Pimenta1, Ana P. M. Duarte1,2, Luis M. Villegas1, Nilton B. Rodrigues1, Luciana C. Pinto1, Keillen M. M. Campos2, Yudi T. Pinilla2, Bárbara Chaves1,2, Maria G. V. Barbosa Guerra2, Wuelton M. Monteiro2, Ryan C. Smith4,5, Alvaro Molina‑Cruz6, Marcus V. G. Lacerda2,3, Nágila F. C. Secundino1, Marcelo Jacobs‑Lorena5, Carolina Barillas‑Mury6 and Paulo F. P. Pimenta1,2* Abstract Background: Malaria is transmitted when an infected mosquito delivers Plasmodium sporozoites into a vertebrate host. There are many species of Plasmodium and, in general, the infection is host-specific. For example, Plasmodium gallinaceum is an avian parasite, while Plasmodium berghei infects mice. These two parasites have been extensively used as experimental models of malaria transmission. Plasmodium falciparum and Plasmodium vivax are the most important agents of human malaria, a life-threatening disease of global importance. To complete their life cycle, Plasmodium parasites must traverse the mosquito midgut and form an oocyst that will divide continuously. Mature oocysts release thousands of sporozoites into the mosquito haemolymph that must reach the salivary gland to infect a new vertebrate host. The current understanding of the biology of oocyst formation and sporozoite release is mostly based on experimental infections with P. berghei, and the conclusions are generalized to other Plasmodium species that infect humans without further morphological analyses. Results: Here, it is described the microanatomy of sporozoite escape from oocysts of four Plasmodium species: the two laboratory models, P.