Download or read book Analysis of Drug Resistance Mechanisms in Intact Plasmodium Falciparum infected Red Blood Cells written by Sarah Reiling and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Malaria is a major global health concern, with half of the world's population being at risk of infection. Among the Plasmodium species that infect humans, P. falciparum causes most fatalities. Chloroquine (CQ) was the drug of choice for decades and considered safe, affordable and easy-to-use until resistance emerged. However, the exact mechanism of CQ resistance is not known. CQ is suggested to accumulate in the parasite's digestive vacuole due to its weak base properties, where it exerts its antimalarial action. Several transporters are involved in intracellular distribution of antimalarial drugs. Among them are the P. falciparum chloroquine resistance transporter (PfCRT) and the P. falciparum multidrug resistance 1 transporter (PfMDR1). Both are located in the digestive vacuolar membrane but transport substrates in opposing directions. While PfCRT transports substrates out of the digestive vacuole (DV), PfMDR1 transports substrates into the DV. PfMDR1 contains five polymorphisms that are suggested to be involved in altered drug transport, although the exact role of each amino acid mutation remains unknown. To gain more insight into the transport functions of PfMDR1, variants with different mutation patterns were analyzed using the fluorescent substrate Fluo-4. We found a crucial role for asparagine (N) at residue 1042 in Fluo-4 transport, while substitution with aspartic acid (D) abolished all transport. In addition, we showed an association of the PfMDR1 N1042D mutation with increased mefloquine but decreased quinine sensitivity. Furthermore, competition studies of Fluo-4 with the antimalarial drugs chloroquine, mefloquine and quinine showed distinct transport inhibition patterns for parasites of different genetic background. This can be used as a tool to evaluate parasite susceptibility to antimalarial drugs.Next, we investigated the mechanism of resistance to CQ in more detail. We showed that parasite survival is higher in CQ-resistant strains compared to CQ-sensitive strains in the initial 10 hours after exposure to equally lethal CQ concentrations. Moreover, dark cytosolic structures appeared in CQ-sensitive strains that were later confirmed as hemozoin-containing compartments surrounded by a membrane bilayer. Leakage of hemozoin crystals out of the DV was ruled out since lysis of the digestive vacuolar membrane did not occur during that time frame. These data suggest that CQ resistance is not linked to reduced drug concentrations in the DV alone, and additional regulatory mechanisms in the parasite must play a crucial role during CQ exposure.To pursue these findings, a commercially available fluorescent tagged CQ analogue, LynxTagTM-CQ-GREEN (CQ-GREEN), was examined for its suitability in studying CQ transport and intracellular drug accumulation. While CQ-GREEN was half as effective in parasite killing of CQ-sensitive strains compared to unmodified CQ, no significant changes in parasite killing were observed in CQ-resistant strains. However, live cell imaging showed that CQ-GREEN accumulated in the parasite cytosol and not the DV. These results show for the first time a potential target for a CQ analogue outside the digestive vacuole. Moreover, intracellular CQGREEN uptake rates were reduced in CQ-resistant strains compared to CQ-sensitive strains. This, too, suggests that CQ-resistant strains must have evolved a regulatory mechanism to decrease intracellular CQ accumulation.The results presented in this thesis expand our understanding of substrate transport by PfMDR1. Furthermore, a novel phenotype was described for CQ-sensitive strains upon drug exposure that was not seen in CQ-resistant strains. These data suggest that altered regulatory mechanisms play a role in CQ resistance and are likely located in the parasite cytosol." --

Download or read book Saving Lives Buying Time written by Institute of Medicine and published by National Academies Press. This book was released on 2004-09-09 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 50 years, low-cost antimalarial drugs silently saved millions of lives and cured billions of debilitating infections. Today, however, these drugs no longer work against the deadliest form of malaria that exists throughout the world. Malaria deaths in sub-Saharan Africaâ€"currently just over one million per yearâ€"are rising because of increased resistance to the old, inexpensive drugs. Although effective new drugs called "artemisinins" are available, they are unaffordable for the majority of the affected population, even at a cost of one dollar per course. Saving Lives, Buying Time: Economics of Malaria Drugs in an Age of Resistance examines the history of malaria treatments, provides an overview of the current drug crisis, and offers recommendations on maximizing access to and effectiveness of antimalarial drugs. The book finds that most people in endemic countries will not have access to currently effective combination treatments, which should include an artemisinin, without financing from the global community. Without funding for effective treatment, malaria mortality could double over the next 10 to 20 years and transmission will intensify.

Download or read book Mechanisms of Drug Resistance in Plasmodium Falciparum written by and published by . This book was released on 1992 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drug resistance has emerged as a major problem in the treatment of all microbial agents and in many cancer chemotherapies. This has necessitated the continuous development of new chemotherapeutic agents both for treatment of infectious agents and for cancer chemotherapy. In the case of malaria, drug resistance is an ever present and increasing problem throughout the world with parasites developing resistance to all commonly used antimalarial drugs, even those recently introduced such as mefloquine and halofantrin. Multidrug resistance has emerged as a major problem in the treatment of many cancers and remains a major obstacle to the successful control of certain neoplasias with chemotherapy. It is an emerging problem in parasitic protozoa, and a major question to be investigated in this proposal is the similarity of multidrug resistance in parasites to that found in mammalian cells. In the case of malaria, the similarity in the pharmacological features of the chloroquine resistance in P. falciparum, namely the proposed efflux mechanism and the reversal of resistance by verapamil, desipramine and related compounds led to the proposal that a similar mechanism for drug resistance was operating in P. falciparum . We have identified genes that had sequence and predicted structural similarity to the mdr genes and have completed the sequence, analyzed the expressed mRNA and protein. These genes and their encoded proteins are indeed related to the family of genes known as the ATP-Binding Cassette family and have the highest homology with the mdr genes from mouse and human ... Malaria, Plasmodium falciparum, Drug Resistance, Molecular biology, Pharmacology, RA 1.

Download or read book Malaria written by Institute of Medicine and published by National Academies Press. This book was released on 1991-02-01 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Malaria is making a dramatic comeback in the world. The disease is the foremost health challenge in Africa south of the Sahara, and people traveling to malarious areas are at increased risk of malaria-related sickness and death. This book examines the prospects for bringing malaria under control, with specific recommendations for U.S. policy, directions for research and program funding, and appropriate roles for federal and international agencies and the medical and public health communities. The volume reports on the current status of malaria research, prevention, and control efforts worldwide. The authors present study results and commentary on the: Nature, clinical manifestations, diagnosis, and epidemiology of malaria. Biology of the malaria parasite and its vector. Prospects for developing malaria vaccines and improved treatments. Economic, social, and behavioral factors in malaria control.

Download or read book Global Report on Antimalarial Drug Efficacy and Drug Resistance written by and published by . This book was released on 2010 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a comprehensive, global overview of antimalarial drug efficacy and the resistance of malaria parasites to the antimalarial medicines used between 2000 and June 2010. Policy-makers in national ministries of health will benefit from this document, as it provides both a global and a regional picture of the efficacy of the antimalarial medicines currently used in national treatment programmes. In addition, the report will be a reference for scientists, enhancing their understanding of the complexity of antimalarial drug resistance.

Download or read book Encyclopedia of Malaria written by and published by Springer. This book was released on 2018-07-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Malaria represents a vast databank of information about the study of malaria. It provides an overview of the historical, rapid and significant developments that have occurred in malaria research, including the 2002 genome sequencing of Plasmodium falciparum and its mosquito vector, Anopheles gambiae. This work provides a concise source of up-to-date research findings in the form of definitions and essays and present comprehensive coverage of topics from history to findings to diagnosis and treatment, written by recognized malaria researchers with practical experience. It appeals to a diverse audience, including malaria researchers, teachers, investigators and public health professionals.

Download or read book Bacterial Adaptation to Co resistance written by Santi M. Mandal and published by Springer Nature. This book was released on 2019-11-17 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed book aims to understand the mechanism of survival of microorganisms in response to chemical stress in various ecological niches that suffer direct human intervention, more so the agricultural, domestic and hospital settings. Microbicides (e.g. disinfectants, antiseptics, fungicides, algaecides, insecticides and pesticides) are used rampantly to control undesirable microbes. Insecticides and pesticides are routinely used in agriculture which directly affect the microbial population in farms, orchards and fields. Health care environments are always stressed with disinfectants and antibiotics. It is always probable that microbicide-stressed microorganisms are in a dynamic state, displaced from one niche to the other. Some soil and water borne bacteria or their resistance determinants are also getting prominence in hospital settings after suffering selective pressure from agricides. In order to reveal the survival strategies of microbicidal-resistant microbes, it is of prime importance to know the mode of action of these complete range of microbicides (agricides to antibiotics). The present book intends to address these issues. There will be several chapters dealing with tolerance and cross resistance in microbes and bacteria in particular, dwelling in various niches. Till date, there is no consensus among scientists in theorizing molecular mechanisms to explain bacterial tolerance and their cross resistance to agricides and antibiotics.

Download or read book Treatment and Prevention of Malaria written by Henry M. Staines and published by Springer Science & Business Media. This book was released on 2012-01-06 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Malaria has defeated previous efforts at eradication and remains a massive global public health problem despite being readily preventable and treatable. It is a devastating disease that also extracts huge economic costs from the poorest countries in endemic regions. Starting with an overview of the disease and its current political, financial and technical context, this Milestones in Drug Therapy volume describes the history, chemistry, mechanisms of action and resistance, preclinical and clinical use, pharmacokinetics and safety and tolerability of the current range of antimalarial drugs. There is particular emphasis on artemisinins and related peroxides, as these drugs have now become the frontline treatment for malaria. Next generation antimalarials, molecular markers for detecting resistance, the importance of diagnostics and disease prevention are also covered in detail.

Download or read book World Malaria Report 2014 written by World Health Organization and published by World Health Organization. This book was released on 2015-07-07 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: The World malaria report 2014 summarizes information received from 97 malaria endemic countries and other sources and updates the analyses presented in 2013. It assesses global and regional malaria trends highlights progress made towards global targets and describes opportunities and challenges in controlling and eliminating the disease. Most of the data presented in this report are for 2013.

Download or read book Malaria Drugs Disease and Post genomic Biology written by David Sullivan and published by Springer Science & Business Media. This book was released on 2006-01-09 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite rapid increases in knowledge, malaria continues to kill more than a million people each year and causes symptomatic disease in a further 300 million individuals. This volume brings some of the world's best investigators to describe recent advances in both the scientific and clinical aspects of malaria, and bridges between the two.

Download or read book Sulfated Polysaccharides written by Miguel Gama and published by Nova Science Publishers. This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the post-genomic era, science is still challenged to explain the biosynthesis of complex polysaccharides and glycoconjugates. Unlike nucleic acids and proteins, the information needed for their biosynthesis is not clearly contained to this day within the genome of the various organisms. This means that no biosynthetic code has been revealed yet. As a result, there will be millions of structurally distinct, functional chemical species at the end of their biosynthesis. This book offers an up-to-date view on sulfated polysaccharide structure and function state of the art in different life kingdoms: bacteria, protista, plantae, fungi and animalia. The structure, activities and current thinking on the interplay between these two vital features (as well as ways to study them) are reviewed in the present book. The growing economical interest in sulfated polysaccharides due to their potential biotechnological use in different areas, such as pharmaceutical and food industries, are also commented on. The information within the chapters adds to other prior available literature; the intention of the authors was to extend and further develop the discussions related to glycobiology.

Download or read book Antimalarial Natural Products written by A. Douglas Kinghorn and published by Springer Nature. This book was released on 2022-01-02 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume begins with a short history of malaria and follows with a summary of its biology. It then traces the fascinating history of the discovery of quinine for malaria treatment, and then describes quinine’s biosynthesis, its mechanism of action, and its clinical use, concluding with a discussion of synthetic antimalarial agents based on quinine’s structure. It also covers the discovery of artemisinin and its development as the source of the most effective current antimalarial drug, including summaries of its synthesis and biosynthesis, its mechanism of action, and its clinical use and resistance. A short discussion of other clinically used antimalarial natural products leads to a detailed treatment of additional natural products with significant antiplasmodial activity, classified by compound type. Although the search for new antimalarial natural products from Nature’s combinatorial library is challenging, it is very likely to yield new antimalarial drugs. This book thus ends by identifying ten natural products with development potential as clinical antimalarial agents.

Download or read book Towards Malaria Elimination written by Sylvie Manguin and published by BoD – Books on Demand. This book was released on 2018-07-18 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Towards Malaria Elimination - A Leap Forward was started to mark the occasion for renewed commitment to end malaria transmission for good (the WHO's call for "Malaria Free World" by 2030). This book is dedicated for the benefit of researchers, scientists, program and policy managers, students and anyone interested in malaria and other mosquito-borne diseases with the goal of sharing recent information on success stories, innovative control approaches and challenges in different regions of the world. Some main issues that emerged included multidrug-resistant malaria and pandemic risk, vaccines, cross-border malaria, asymptomatic parasite reservoir, the threat of Plasmodium vivax and Plasmodium knowlesi, insecticide resistance in Anopheles vectors and outdoor malaria transmission. This book is one little step forward to bring together in 17 chapters the experiences of malaria-expert researchers from five continents to present updated information on disease epidemiology and control at the national/regional level, highlighting the constraints, challenges, accomplishments and prospects of malaria elimination.

Download or read book Antimicrobial Drug Resistance written by Douglas Mayers and published by Springer Science & Business Media. This book was released on 2009-07-06 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ? rst edition of Antimicrobial Drug Resistance grew out of a desire by the editors and authors to have a comprehensive resource of information on antimicrobial drug resistance that encompassed the current information available for bacteria, fungi, protozoa and viruses. We believe that this information will be of value to clinicians, epidemiologists, microbiologists, virologists, parasitologists, public health authorities, medical students and fellows in training. We have endeavored to provide this information in a style which would be accessible to the broad community of persons who are concerned with the impact of drug resistance in our cl- ics and across the broader global communities. Antimicrobial Drug Resistance is divided into Volume 1 which has sections covering a general overview of drug resistance and mechanisms of drug resistance ? rst for classes of drugs and then by individual microbial agents including bacteria, fungi, protozoa and viruses. Volume 2 addresses clinical, epidemiologic and public health aspects of drug resistance along with an overview of the conduct and interpretation of speci? c drug resistance assays. Together, these two volumes offer a comprehensive source of information on drug resistance issues by the experts in each topic.

Download or read book Chemotherapy and Drug Resistance in Malaria written by Wallace Peters and published by . This book was released on 1987 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Drug Resistance in Bacteria Fungi Malaria and Cancer written by Gunjan Arora and published by Springer. This book was released on 2017-03-21 with total page 629 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compilation of past and recent knowledge in the field of emerging drug resistance. The book covers major aspects of drug resistance in bacteria, fungi, malaria, and cancer.Human survival on earth is constantly threatened by disease and syndrome. From the early days, the aim of research in medicine was to find therapeutic agents that can improve the quality of human life. Although humans are dependent on natural compounds from early days their dependence of drugs increased excessively in last century. The advances in chemistry and biology have helped researchers to identify the drugs that have improved treatment of many diseases. The primary factor for treatment of these diseases is dependent on the efficacy of drugs available. The development of resistance to these drugs is one of the major hindrances. Although there are number of books available on this topic, “drug resistance” biology across kingdoms has never been discussed in a coherent way.

Download or read book Rodent Malaria written by R. Killick-Kendrick and published by Elsevier. This book was released on 2012-12-02 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rodent Malaria reviews significant findings concerning malaria parasites of rodents, including their taxonomy, zoogeography, and evolution, along with life cycles and morphology; genetics and biochemistry; and concomitant infections. This volume is organized into eight chapters and begins by sketching out the history of the discovery of rodent as well as aspects of parasitology, immunology, and chemotherapy. These concepts are investigated two decades following Ignace Vincke's major discovery and Meir Yoeli's successful establishment of the method of cyclical transmission of the parasite. The following chapters focus on the taxonomy and systematics of the subgenus Vinckeia, with reference to the concepts of species and subspecies of animals and the degree to which they apply to malaria parasites, in particular to those of rodents. The discussion then shifts to how the rodent malaria parasites provide a unique insight into the subcellular organization of Plasmodium species, the use of rodent malaria as an experimental model to study immunological responses, and infectious agents that interact with malaria parasites. The book concludes with a chapter on malaria chemotherapy, with emphasis on the value of rodent malaria in antimalarial drug screening and the use of antimalarial drugs as biological probes. This book will be of interest to protozoologists and physicians as well as those from other disciplines including biochemistry, immunology, pharmacology, cell biology, and genetics.