Biofilm Formation By Staphylococci And Streptococci Structural Functional And Regulatory Aspects And Implications For Pathogenesis
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Biofilm Formation By Staphylococci And Streptococci Structural Functional And Regulatory Aspects And Implications For Pathogenesis
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Author : Joan A. Geoghegan
language : en
Publisher: Frontiers Media SA
Release Date : 2015-06-25
Biofilm Formation By Staphylococci And Streptococci Structural Functional And Regulatory Aspects And Implications For Pathogenesis written by Joan A. Geoghegan and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-25 with Infectious and parasitic diseases categories.
Members of the genus Staphylococcus and Streptococcus are the causative agnets of many human and animal diseases. Over the past decade the complete sequencing of many staphylococcal and streptococcal genomes has promoted a significant advance in our knowledge of these important pathogens. The pathogenicity of these bacteria is due to the expression of a large variety of virulence factors. Such determinants, which are cell wall-associated and secreted proteins, include adhesins that confer to the pathogen the ability to attach to extracellular matrix/plasma and host cell surfaces, proteins that contribute to host cell invasion and intracellular survival and soluble factors that decrease phagocytosis and modulate the immune response. Furthermore, these Gram-positive cocci in many natural environments (heart valve, lung, oral cavity, throat) and infections on implanted devices live in matrix-encased groups known as biofilms. Biofilms are specialized bacterial communities with high order organization analogous to that of a tissue in multicellular organism that adhere to abiotic or biological substrata and produce an exopolymeric matrix composed of polysaccarides, proteins, DNA or combination thereof. Bacteria within a biofilm persist in adverse conditions, show resistance to killing by antibiotics and to host immune defences and are difficult to eradicate and treat clinically. Therefore, understanding the mechanisms of biofilm development will allow us to effectively combat staphylococcal/streptococcal biofilm-based infections. This Research Topic will focus on the molecular components involved in biofilm formation by staphylococci and streptococci, the role they play in the development, maturation and dispersal of biofilm and on the regulatory aspects of such complex processes. The implication for the pathogenesis of infective diseases and potential therapeutic strategies against biofilm-based infections will be also discussed. The articles will highlight both the recent advances and future challenges inherent in this rapidly evolving area.
Biofilms In Human Diseases Treatment And Control
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Author : Sunil Kumar
language : en
Publisher: Springer Nature
Release Date : 2019-11-19
Biofilms In Human Diseases Treatment And Control written by Sunil Kumar and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-11-19 with Medical categories.
This book highlights treatment strategies for bacterial biofilms in connection with a variety of human diseases. In particular, it reviews bacterial biofilm formation and its mechanism. Topics covered include biofilms in human health, the role of biofilms in mediating human diseases, and methods for testing bacterial biofilms. Further sections concentrate on biofilm-mediated diseases in different parts of the human gastrointestinal tract, while therapeutic strategies for biofilm control and natural agents that disrupt bacterial biofilms are also covered. Readers will also find the latest advances in probiotics and biofilms, as well as the use of probiotics to counteract biofilm-associated infections. Biofilms and antimicrobial resistance are discussed. Subsequent chapters address the management of inflammatory bowel disease via probiotics biofilms, as well as the role of probiotics bacteria in the treatment of human diseases associated with bacterial biofilms. The book is chiefly intended for clinicians/scientists in the fields of medical microbiology, applied microbiology, biochemistry, and biotechnology.
Bacterial Biofilms
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Author : Tony Romeo
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-02-26
Bacterial Biofilms written by Tony Romeo and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-02-26 with Medical categories.
Throughout the biological world, bacteria thrive predominantly in surface-attached, matrix-enclosed, multicellular communities or biofilms, as opposed to isolated planktonic cells. This choice of lifestyle is not trivial, as it involves major shifts in the use of genetic information and cellular energy, and has profound consequences for bacterial physiology and survival. Growth within a biofilm can thwart immune function and antibiotic therapy and thereby complicate the treatment of infectious diseases, especially chronic and foreign device-associated infections. Modern studies of many important biofilms have advanced well beyond the descriptive stage, and have begun to provide molecular details of the structural, biochemical, and genetic processes that drive biofilm formation and its dispersion. There is much diversity in the details of biofilm development among various species, but there are also commonalities. In most species, environmental and nutritional conditions greatly influence biofilm development. Similar kinds of adhesive molecules often promote biofilm formation in diverse species. Signaling and regulatory processes that drive biofilm development are often conserved, especially among related bacteria. Knowledge of such processes holds great promise for efforts to control biofilm growth and combat biofilm-associated infections. This volume focuses on the biology of biofilms that affect human disease, although it is by no means comprehensive. It opens with chapters that provide the reader with current perspectives on biofilm development, physiology, environmental, and regulatory effects, the role of quorum sensing, and resistance/phenotypic persistence to antimicrobial agents during biofilm growth.
Streptococcal Superantigens
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Author : Anshu Babbar
language : en
Publisher:
Release Date : 2015
Streptococcal Superantigens written by Anshu Babbar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
This book provides ample knowledge and better understanding of Streptococcus pyogenes and their superantigens. Many illustrations make this a highly informative book. This book elucidates briefly Streptococcus pyogenes as a strict human pathogen possessing an array of virulence factors. These help in evading host immune responses such as by the activation of non-specific T-cell subpopulations by producing superantigens. This book mainly focuses on streptococcal superantigens and explains how they are different from conventional antigens. Moreover, it elaborates those diseases in which superantigens are actively involved. Useful aspects of superantigens and different therapeutic interventions to eradicate superantigens induced diseased are also discussed.
Model Organisms For Microbial Pathogenesis Biofilm Formation And Antimicrobial Drug Discovery
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Author : Busi Siddhardha
language : en
Publisher: Springer Nature
Release Date : 2020-03-28
Model Organisms For Microbial Pathogenesis Biofilm Formation And Antimicrobial Drug Discovery written by Busi Siddhardha and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-28 with Science categories.
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.
Oral Biofilms
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Author : S. Eick
language : en
Publisher: Karger Medical and Scientific Publishers
Release Date : 2020-12-21
Oral Biofilms written by S. Eick and has been published by Karger Medical and Scientific Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-21 with Medical categories.
Biofilms are highly organized polymicrobial communities that are embedded in an extracellular matrix and formed on natural and artificial surfaces. In the oral cavity, biofilms are formed not only on natural teeth, but also on restorative materials, prosthetic constructions, and dental implants. Oral diseases like caries, gingivitis, periodontitis, and also pulp inflammation are associated with biofilms. This publication is an up-to-date overview on oral biofilms from different clinically relevant perspectives. Experts comprising basic researchers and clinicians report on recent research relating to biofilms - from general summaries to recommendations for daily clinical work. This book covers all aspects of oral biofilms, including models used in the laboratory, biofilms in dental water unit lines, periodontal and peri-implant biofilms, caries-related biofilms, halitosis, endodontic biofilms, and Candida infections, as well as biofilms on dental materials and on orthodontic appliances. Several chapters deal with anti-biofilm therapy, from the efficacy of mechanical methods and the use of antimicrobials, to alternative concepts. This publication is particularly recommended to dental medicine students, practitioners, other oral healthcare professionals, and scientists with an interest in translational research on biofilms.
Staphylococcus
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Author : Greg A. Somerville
language : en
Publisher: Caister Academic Press Limited
Release Date : 2016
Staphylococcus written by Greg A. Somerville and has been published by Caister Academic Press Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Medical categories.
In the twenty first century, the bacterium Staphylococcus aureus continues to be a global threat to human and animal health. There is currently no vaccine for preventing S. aureus infections and the bacterium has developed resistance to many, if not most, antibiotics, hence the therapeutic options are rapidly disappearing. The genetic and physiological flexibility that allows this commensal bacterium to become a powerful pathogen and elucidating the myriad of mechanisms it employs to avoid the host and/or antimicrobials are important areas of research. This book brings together respected S. aureus experts from around the world to provide a timely overview of staphylococcal research. Topics covered include: historical background; medical significance in humans and animals; genetic variation; virulence factors; metabolism and physiology; physiological proteomics; cell wall assembly and physiology; transition metal ion homeostasis; molecular strategies of antibiotic resistance; genetic regulation; and immune response. Essential reading for scientists working with staphylococci. This text is an excellent introduction for entry level scientists, as well as those seeking a deeper understanding of this critically important bacterial pathogen.
Functional Characterization Of The Streptococcus Sanguinis Com Regulon
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Author : Jill Callahan
language : en
Publisher:
Release Date : 2011
Functional Characterization Of The Streptococcus Sanguinis Com Regulon written by Jill Callahan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Streptococcus sanguinis is an important component of the dental plaque biofilm and is believed to play a beneficial role in the oral cavity. S. sanguinis is also a leading cause of infective endocarditis (IE), a potentially lethal infection of the cardiac valves. S. sanguinis possesses genetic competence, the ability to acquire exogenous DNA into its genome. In the well characterized system of S. pneumoniae, genetic competence requires a quorum sensing system encoded by the early comCDE genes, as well as late genes controlled by the alternate sigma factor, ComX. Previous studies in other streptococcal species have suggested functions for the com regulon apart from DNA uptake. Here we characterized functions of the S. sanguinis com regulon genes in genetic competence, IE virulence, and biofilm formation. Our findings indicated that the early regulatory genes and those under the control of ComX in S. sanguinis play similar roles in genetic competence as their orthologs in other competent streptococci; however the sequence and mechanism of processing of the quorum sensing signal, competence-stimulating peptide, CSP, were determined to be unique. Using a rabbit endocarditis model, we determined that the comCDE and comX genes were not required for virulence, bacteremia, or pathology under a variety of infection conditions. In contrast, examination of biofilms by microscopy and crystal violet staining indicated that S. sanguinis CSP enhanced biofilm formation in a comDE-dependent manner. Deletion of the early com gene SSA_0195 eliminated this effect, while expression of the gene from an inducible promoter increased biofilm formation in the absence of CSP. Deletion of the comX gene resulted in biofilms with increased staining, cell death, and profoundly altered structure. Treatment with DNase I reduced biofilm formation in a com-independent manner. Taken together, these results suggest that expression of SSA_0195 is both necessary and sufficient for CSP-dependent biofilm enhancement, and that the late gene activator, ComX, is required to maintain normal biofilm architecture. Our findings suggest the com regulon of S. sanguinis may be an important determinant of competitiveness in the mouth, where native CSP production may occur at levels sufficient to influence biofilm formation.
The Staphylococci And Staphylococcal Pathogenesis
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Author : David Heinrichs
language : en
Publisher: Frontiers E-books
Release Date :
The Staphylococci And Staphylococcal Pathogenesis written by David Heinrichs and has been published by Frontiers E-books this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Members of the genus Staphylococcus play important roles in disease causation in humans and animals. Over the past decade, the completed sequencing of many staphylococcal genomes has contributed to a surge in the number of publications, which have promoted a tremendous advance in our knowledge of these important pathogens. Significant developments include the emergence of new and highly virulent strains of S. aureus, advances in tracking the evolution of human and animal adapted strains, a heightened appreciation of the role of mobile genetic elements in antibiotic resistance and pathogenesis, and important insights into staphylococcal physiology, immune evasion strategies, and cell surface proteins, as well as significant advances in vaccine development and therapeutics. This Research Topic will focus attention on the latest developments in these areas as they pertain to S. aureus and members of the coagulase-negative Staphylococci, and will also strive to identify areas of future development.