Download or read book Mechanistic Insights of Drug Resistance in Staphylococcus Aureus with Special Reference to Newer Antibiotics written by Atamjit Singh and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Staphylococcus aureus is the most ubiquitous microorganism in both environment as well as animals and exists as commensal and pathogenic bacterium. In past few years it has been emerged as a superbug causing serious burden on healthcare system. This bacterium has been found to be the most resistant one toward most of the antibiotics due to its rapid structural and genetic modifications. This chapter will shed light on various types of molecular mechanisms responsible for resistance of Staphylococcus aureus showcasing how it has been emerged as a superbug. Moreover, the recent approaches which include exploring of different drug targets keeping in view the structural and functional behavior of the Staphylococcus aureus has also been discussed.
Download or read book Insights Into Drug Resistance in Staphylococcus aureus written by and published by BoD – Books on Demand. This book was released on 2021-12-08 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Staphylococcus aureus is a coccus, gram-positive, non-spore forming, and non-motile bacterium. Its commensal and opportunistic capabilities make it able to colonize different sites of animals and humans. Resistance to antibiotics has resulted in development of new strains and new types within strains. Types of methicillin-resistant S. aureus (MRSA) include hospital-acquired MRSA (HA-MRSA), community-acquired MRSA (CA-MRSA), and livestock-acquired MRSA (LA-MRSA). There are also new strains like vancomycin-resistant S. aureus (VRSA) and vancomycin-intermediate S. aureus (VISA). Expansion in resistance is expected to give rise to newer strains resistant to antibiotics such as macrolide (erm gene), tetracycline (tet genes), mupirocin (mupR), and fusidic acid (fusD). Alternative approaches like nanoparticles, bacteriophages, phytochemicals, and more are required to tackle this pathogen. This book contains information on epidemiology, resistance mechanisms, and alternative ways to curtail S. aureus infection, as well as future research opportunities.
Download or read book The Rise of Virulence and Antibiotic Resistance in Staphylococcus aureus written by Shymaa Enany and published by BoD – Books on Demand. This book was released on 2017-03-08 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Staphylococcus aureus S. aureus is a growing issue both within hospitals and community because of its virulence determinants and the continuing emergence of new strains resistant to antimicrobiotics. In this book, we present the state of the art of S. aureus virulence mechanisms and antibiotic-resistance profiles, providing an unprecedented and comprehensive collection of up-to-date research about the evolution, dissemination, and mechanisms of different staphylococcal antimicrobial resistance patterns alongside bacterial virulence determinants and their impact in the medical field. We include several review chapters to allow readers to better understand the mechanisms of methicillin resistance, glycopeptide resistance, and horizontal gene transfer and the effects of alterations in S. aureus membranes and cell walls on drug resistance. In addition, we include chapters dedicated to unveiling S. aureus pathogenicity with the most current research available on S. aureus exfoliative toxins, enterotoxins, surface proteins, biofilm, and defensive responses of S. aureus to antibiotic treatment.
Download or read book Mechanisms of antibiotic resistance written by Jun Lin and published by Frontiers Media SA. This book was released on 2015-06-01 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antibiotics represent one of the most successful forms of therapy in medicine. But the efficiency of antibiotics is compromised by the growing number of antibiotic-resistant pathogens. Antibiotic resistance, which is implicated in elevated morbidity and mortality rates as well as in the increased treatment costs, is considered to be one of the major global public health threats (www.who.int/drugresistance/en/) and the magnitude of the problem recently prompted a number of international and national bodies to take actions to protect the public (http://ec.europa.eu/dgs/health_consumer/docs/road-map-amr_en.pdf: http://www.who.int/drugresistance/amr_global_action_plan/en/; http://www.whitehouse.gov/sites/default/files/docs/carb_national_strategy.pdf). Understanding the mechanisms by which bacteria successfully defend themselves against the antibiotic assault represent the main theme of this eBook published as a Research Topic in Frontiers in Microbiology, section of Antimicrobials, Resistance, and Chemotherapy. The articles in the eBook update the reader on various aspects and mechanisms of antibiotic resistance. A better understanding of these mechanisms should facilitate the development of means to potentiate the efficacy and increase the lifespan of antibiotics while minimizing the emergence of antibiotic resistance among pathogens.
Download or read book Antibiotic Discovery and Development written by Thomas J. Dougherty and published by Springer Science & Business Media. This book was released on 2011-12-18 with total page 1119 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers all aspects of the antibiotic discovery and development process through Phase II/III. The contributors, a group of highly experienced individuals in both academics and industry, include chapters on the need for new antibiotic compounds, strategies for screening for new antibiotics, sources of novel synthetic and natural antibiotics, discovery phases of lead development and optimization, and candidate compound nominations into development. Beyond discovery , the handbook will cover all of the studies to prepare for IND submission: Phase I (safety and dose ranging), progression to Phase II (efficacy), and Phase III (capturing desired initial indications). This book walks the reader through all aspects of the process, which has never been done before in a single reference. With the rise of antibiotic resistance and the increasing view that a crisis may be looming in infectious diseases, there are strong signs of renewed emphasis in antibiotic research. The purpose of the handbook is to offer a detailed overview of all aspects of the problem posed by antibiotic discovery and development.
Download or read book Treating Infectious Diseases in a Microbial World written by National Research Council and published by National Academies Press. This book was released on 2006-01-03 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humans coexist with millions of harmless microorganisms, but emerging diseases, resistance to antibiotics, and the threat of bioterrorism are forcing scientists to look for new ways to confront the microbes that do pose a danger. This report identifies innovative approaches to the development of antimicrobial drugs and vaccines based on a greater understanding of how the human immune system interacts with both good and bad microbes. The report concludes that the development of a single superdrug to fight all infectious agents is unrealistic.
Download or read book Beta lactam Resistance and Novel Therapeutics for Staphylococcus Aureus written by Liana Chan and published by . This book was released on 2014 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract [beta]-Lactam Resistance and Novel Therapeutics for Staphylococcus aureus by Liana Celene Chan Doctor of Philosophy in Infectious Diseases & Immunity University of California, Berkeley Professor George Sensabaugh, Chair Staphylococcus aureus is an important human pathogen capable of causing disease in otherwise healthy individuals. It causes mostly skin and soft tissue infections but can cause more invasive diseases. Treatment for S. aureus has become a problem due to increasing resistance and limited new therapeutics, particularly for more serious infections. Methicillin-resistant S. aureus (MRSA) displays class resistance to [beta]-lactam antibiotics through the presence of penicillin-binding protein 2a (PBP2a), encoded by mecA. Chapter 1 contains a thorough literature review on MRSA and antibiotic resistance, including epidemiology, therapeutic options, mechanisms of antibiotic resistance, modes of resistance acquisition and S. aureus animal models. MRSA has a great capacity to rapidly develop antibiotic resistance, defined as the ability of bacteria to resist a drug to which it was originally sensitive. Limited antibiotics are approved for severe MRSA infections including vancomycin, daptomycin, linezolid and ceftaroline. Resistance to these drugs almost always occurs in MRSA backgrounds rather than methicillin-sensitive S. aureus (MSSA) backgrounds. Invasive MRSA infections have been associated with treatment failure and increased risk of mortality. The development of new antibiotics is of utmost importance. This dissertation encompasses the following areas of research: i) ability of S. aureus to develop resistance to new [beta]-lactam antibiotics, ii) potential pathways to prevent antibiotic resistance and iii) efficacy studies of a new antibiotic as a potential alternative for MRSA treatment. Ceftobiprole and ceftaroline, members of a new class of [beta]-lactams, target PBP2a with high affinity, the core component of [beta]-lactam resistance in MRSA strains. Ceftobiprole is in phase 3 clinical trials while ceftaroline has been FDA approved. The goal of Chapters 2 and 3 was to identify mechanisms of resistance and likely targets associated with resistance. Chapter 2 determined resistance could be generated to ceftobiprole and ceftaroline by passaging MRSA strains in increasing concentrations of antibiotic. The mechanism of resistance in these mutants was mutagenesis of mecA and mutations in other PBPs. Chapter 3 analyzed mecA-independent mechanisms of resistance to determine the affect of these antibiotics in the absence of PBP2a. MRSA strains cured of SCCmec were passaged in ceftaroline and ceftobiprole, resulting in mutants with high-level, broad-spectrum [beta]-lactam resistance. These mutants have mutations in pbp4 and other genes as well as upregulaed pbp4 mRNA levels in some mutants. Knowledge gained from these studies will provide information on novel mechanisms of [beta]-lactam resistance and will guide development of new antibiotics. Chapter 4 is dedicated to exploring the role of the SOS stress response in antibiotic resistance. The SOS response is a stress response regulated by LexA, a transcriptional repressor, and RecA, activator of LexA. When bacteria are exposed to stimuli that break DNA (e.g. UV, antibiotics, etc.), RecA activates LexA, causing derepression of the SOS genes, including error-prone polymerases that increase mutational frequencies. [beta]-lactams have been shown to activate the SOS response in certain strains but not in a prevalent community-acquired MRSA (CA-MRSA) background. Given the increasing prevalence of CA-MRSA strains and [beta]-lactam resistance, exposure of MRSA to [beta]-lactams could potentially activate the SOS response resulting in increased antibiotic resistance. The goal of this chapter is to test the role of the SOS response in antibiotic resistance with [beta]-lactam induction in CA-MRSA. To test this hypothesis, a non-cleavable lexA mutant was created, which constitutively represses the SOS response. The results of this study indicate that, in the USA300 background, the SOS response was not solely responsible for increased antibiotic resistance and suggests that this pathway might not be a good therapeutic target to decrease emergence of resistance in CA-MRSA strains. Chapter 5 explores recently discovered options in the presence of ceftaroline-resistance or [beta]-lactam intolerance. Given the emergence of strains resistant to antibiotics used for severe MRSA infections including vancomycin, daptomycin, linezolid and ceftaroline, new therapeutics are needed. Tedizolid phosphate is a second-generation oxazolidinone in late stage clinical development with activity against MRSA. The goal of this chapter is to test the efficacy of tedizolid phosphate in an animal model of invasive MRSA infection. Tedizolid phosphate was compared to standard of care antibiotics used to treat MRSA bacteremia, vancomycin and daptomycin, in a rabbit model of endocarditis. At high doses, tedizolid phosphate was non-inferior to vancomycin. At doses achieving serum concentrations similar to human doses, tedizolid phosphate was not as efficacious as vancomycin or daptomycin. Our results suggest tedizolid phosphate is ineffective at treating severe infections, such as MRSA endocarditis, compared to vancomycin. The dissertation confirms the ability of S. aureus to develop resistance to new antibiotics and further describes the difficulty in developing efficacious new therapies. Discovering mechanisms of resistance will provide knowledge for potential new anti-MRSA therapeutics.
Download or read book Antibiotic Drug Resistance written by José-Luis Capelo-Martínez and published by John Wiley & Sons. This book was released on 2019-09-24 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a thorough and authoritative overview of the multifaceted field of antibiotic science – offering guidance to translate research into tools for prevention, diagnosis, and treatment of infectious diseases. Provides readers with knowledge about the broad field of drug resistance Offers guidance to translate research into tools for prevention, diagnosis, and treatment of infectious diseases Links strategies to analyze microbes to the development of new drugs, socioeconomic impacts to therapeutic strategies, and public policies to antibiotic-resistance-prevention strategies
Download or read book Frontiers in Staphylococcus aureus written by Shymaa Enany and published by BoD – Books on Demand. This book was released on 2017-03-08 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Staphylococcus was first recognized as a human pathogen in 1880 and was named for its grape cluster-like appearance. In 1884, Staphylococcus aureus was identified and named for its vibrant golden color, which was later found to be the result of golden toxin production. Here, experts examine in-depth patterns of S. aureus colonization and exposures in humans, mammals, and birds that have led to the development of various clinical diseases. The mode of transmission of S. aureus and different methods for its detection in different samples are defined. Conventional antibiotic options to treat this aggressive, multifaceted, and readily adaptable pathogen are becoming limited. Alternative, novel chemotherapeutics to target S. aureus are discussed in the pages within, including herbal medicines, bee products, and modes of delivery.
Download or read book New Antibiotic Targets written by W. Scott Champney and published by Springer Science & Business Media. This book was released on 2008-01-15 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines specific techniques which can be used to explore new drug targets and the effectiveness of new antibiotics. By testing new antimicrobial agents and modified existing drugs, the most vulnerable cell processes, such as cell wall and membrane synthesis, DNA replication, RNA transcription and protein synthesis, can be better exploited. This in-depth volume, however, delves even deeper by identifying additional novel cellular targets for these new therapies. The book will provide laboratory investigators with the vital tools they need to test the antimicrobial potential of products and to curb the rise of so many infectious diseases.
Download or read book Innovations in Biotechnology for a Sustainable Future written by Naga Raju Maddela and published by Springer Nature. This book was released on 2021-10-23 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This contributed volume compiles the latest improvements in the field of biotechnology. It focuses on topics that comprises industrial, environment, agricultural and medical related issues to technology and biological studies and exhibits the correlation between the biological world and the dependence of humans on it. The book is organized into five parts covering the role of biotechnology in industrial products, environmental remediation, agriculture and pharmacological agents. Ranging from micro-scale studies to macro, it covers a huge domain of agricultural biotechnology and focuses on important commercial crops (e.g. cacao and coffee), arbuscular mycorrhizal fungi, flow and distribution of phosphorus in agricultural soils in the Latin American region. Overall, the book portrays the importance of modern biotechnology and its role in solving the problems in modern day life. The book is a ready reference for practicing students, researchers of environmental engineering, chemical engineering, agricultural engineering, and other allied fields likewise.
Download or read book Antimicrobial Resistance written by World Health Organization and published by . This book was released on 2014 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary report published as technical document with reference number: WHO/HSE/PED/AIP/2014.2.
Download or read book Kucers The Use of Antibiotics written by M. Lindsay Grayson and published by CRC Press. This book was released on 2017-10-02 with total page 4894 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kucers’ The Use of Antibiotics is the definitive, internationally-authored reference, providing everything that the infectious diseases specialist and prescriber needs to know about antimicrobials in this vast and rapidly developing field. The much-expanded Seventh Edition comprises 4800 pages in 3 volumes in order to cover all new and existing therapies, and emerging drugs not yet fully licensed. Concentrating on the treatment of infectious diseases, the content is divided into four sections - antibiotics, anti-fungal drugs, anti-parasitic drugs, and anti-viral drugs - and is highly structured for ease of reference. Each chapter is organized in a consistent format, covering susceptibility, formulations and dosing (adult and pediatric), pharmacokinetics and pharmacodynamics, toxicity, and drug distribution, with detailed discussion regarding clinical uses - a feature unique to this title. Compiled by an expanded team of internationally renowned and respected editors, with expert contributors representing Europe, Africa, Asia, Australia, South America, the US, and Canada, the Seventh Edition adopts a truly global approach. It remains invaluable for anyone using antimicrobial agents in their clinical practice and provides, in a systematic and concise manner, all the information required when prescribing an antimicrobial to treat infection.
Download or read book Model Organisms for Microbial Pathogenesis Biofilm Formation and Antimicrobial Drug Discovery written by Busi Siddhardha and published by Springer Nature. This book was released on 2020-03-28 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides essential insights into microbial pathogenesis, host-pathogen interactions, and the anti-microbial drug resistance of various human pathogens on the basis of various model organisms. The initial sections of the book introduce readers to the mechanisms of microbial pathogenesis, host-pathogen interactions, anti-microbial drug resistance, and the dynamics of biofilm formation. Due to the emergence of various microbial resistant strains, it is especially important to understand the prognosis for microbial infections, disease progression profiles, and mechanisms of resistance to antibiotic therapy in order to develop novel therapeutic strategies. In turn, the second part of the book presents a comparative analysis of various animal models to help readers understand microbial pathogenesis, host-pathogen interactions, anti-microbial drug discovery, anti-biofilm therapeutics, and treatment regimes. Given its scope, the book represents a valuable asset for microbiologists, biotechnologists, medical professionals, drug development researchers, and pharmacologists alike.
Download or read book Antimicrobial Resistance written by Maria Cristina Ossiprandi and published by BoD – Books on Demand. This book was released on 2015-11-26 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antibiotic resistance has become a worldwide health issue, globally recognized as the first priority by WHO. Many forms of resistance can spread with remarkable speed and cross international boundaries. World health leaders are devoting efforts to the problem by planning strategies for monitoring the effectiveness of public health interventions and detecting new trends and threats. This volume focuses on the problem from different perspectives, taking into consideration geographical dissemination (soil and water), human medicine (methicillin-resistant Staphylococcus aureus and Klebsiella pneumoniae) and veterinary (Enterococcus spp.) impact and molecular analysis. The purpose of this volume is to provide a useful tool for control and prevention and to discuss useful epidemiological data concerning ways of obtaining an accurate picture of resistance in different communities.
Download or read book Antibiofilm Agents written by Kendra P. Rumbaugh and published by Springer Science & Business Media. This book was released on 2014-05-08 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a survey of recent advances in the development of antibiofilm agents for clinical and environmental applications. The fact that microbes exist in structured communities called biofilms has slowly become accepted within the medical community. We now know that over 80% of all infectious diseases are biofilm-related; however, significant challenges still lie in our ability to diagnose and treat these extremely recalcitrant infections. Written by experts from around the globe, this book offers a valuable resource for medical professionals seeking to treat biofilm-related disease, academic and industry researchers interested in drug discovery and instructors who teach courses on microbial pathogenesis and medical microbiology.
Download or read book Antibiotics written by Christopher Walsh and published by John Wiley & Sons. This book was released on 2020-08-06 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: A chemocentric view of the molecular structures of antibiotics, their origins, actions, and major categories of resistance Antibiotics: Challenges, Mechanisms, Opportunities focuses on antibiotics as small organic molecules, from both natural and synthetic sources. Understanding the chemical scaffold and functional group structures of the major classes of clinically useful antibiotics is critical to understanding how antibiotics interact selectively with bacterial targets. This textbook details how classes of antibiotics interact with five known robust bacterial targets: cell wall assembly and maintenance, membrane integrity, protein synthesis, DNA and RNA information transfer, and the folate pathway to deoxythymidylate. It also addresses the universe of bacterial resistance, from the concept of the resistome to the three major mechanisms of resistance: antibiotic destruction, antibiotic active efflux, and alteration of antibiotic targets. Antibiotics also covers the biosynthetic machinery for the major classes of natural product antibiotics. Authors Christopher Walsh and Timothy Wencewicz provide compelling answers to these questions: What are antibiotics? Where do antibiotics come from? How do antibiotics work? Why do antibiotics stop working? How should our limited inventory of effective antibiotics be addressed? Antibiotics is a textbook for graduate courses in chemical biology, pharmacology, medicinal chemistry, and microbiology and biochemistry courses. It is also a valuable reference for microbiologists, biological and natural product chemists, pharmacologists, and research and development scientists.
