Download or read book Identifying Mechanisms of Thin Filament Activation in Cardiac Muscle Contraction written by John L. Williams and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Myocardial contractions are generated by the binding of myosin motor proteins to cardiac actin in the thin filament. This process is regulated by the binding of calcium ions to troponin C. When Ca2+ binds to site II of troponin C, the troponin complex undergoes a conformational change which displaces tropomyosin and uncovers the myosin-binding sites on actin. This allows myosin to bind, and in the presence of ATP, allows for cross-bridges to cycle in order to generate force. While calcium binding to troponin is considered to be the key regulating mechanism for striated muscle contraction, myosin cross-bridges are also thought to play a role in cooperatively activating the thin filament. This cross-bridge contribution to thin filament activation appears to be more important in cardiac muscle systems than it is in skeletal muscle. However, many of these experiments examined the effects of cross-bridges under non-physiological conditions, leading to questions about the importance of actively cycling cross-bridges. Furthermore, there are questions as to the contribution of cross-bridge activation under conditions of low cross-bridge number, such as during filament sliding, primarily due to the inability to effectively change the number of cross-bridges that bind within a system in a controlled manner. In order to examine this possibility, I developed a porcine cardiac heavy meromyosin fragment that could be used to effectively vary the amount of myosin cross-bridges present in the in vitro motility assay. Additionally, I utilized this fragment at varying concentrations to determine several key characteristics of the cooperative mechanisms that govern thin filament activation. As a result, it was determined that cardiac myosin is sensitive to temperature when being proteolytically cleaved to form pcHMM, and subsequently, the protocol for making pcHMM requires decreasing the reaction temperature and increasing the protease concentration in order to yield a functional fragment. Secondly, it was determined that cardiac myosin cross-bridges number plays a minimal role in enhancing the activation of the thin filament by Ca2+ during unloaded filament sliding, and that this contribution in cardiac systems will be seen in the presence of a high density of actively cycling motors. Lastly, it is suggested that the enhancement that is seen due to increased numbers of cycling cardiac motors may be due to the regulatory proteins modulating the speed of myosin cycling, which is consistent with previously published literature. These findings help to advance our understanding of the contractile process and increase our understanding of the molecular complexities that govern thin filament activation by Ca2+.

Download or read book Molecular Control Mechanisms in Striated Muscle Contraction written by R.J. Solaro and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Control Mechanisms in Striated Muscle Contraction addresses the molecular mechanisms by which contraction of heart and skeletal muscles is regulated, as well as the modulation of these mechanisms by important (patho)physiological variables such as ionic composition of the myoplasm and phosphorylations of contractile and regulatory proteins. For the novice, this volume includes chapters that summarize current understanding of excitation-contraction coupling in striated muscles, as well as the compositions and structures myofibrillar thick and thin filaments. For the expert, this volume presents detailed pictures of current understanding of the mechanisms underlying the CA2+ regulation of contraction in heart and skeletal muscles and discusses important directions for future investigation.

Download or read book Molecular and Cellular Aspects of Muscle Contraction written by Haruo Sugi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the proceedings of a muscle symposium, which was supported by the grant from the Fujihara Foundation of Science to be held as the Fourth Fujihara Seminar on October 28 -November 1, 2002, at Hakone, Japan. The Fujihara Seminar covers all fields of natural science, while only one proposal is granted every year. It is therefore a great honor for me to be able to organize this meeting. Before this symposium, I have organized muscle symposia five times, and published the proceedings: " Cross-bridge Mechanism in Muscle Contraction (University of Tokyo Press, 1978), "Contractile Mechanisms in Muscle" (plenum, 1984); "Molecular Mechanisms of Muscle Contraction" (plenum, 1988); "Mechanism of MyofIlament Sliding in Muscle contraction" (plenum, 1993); "Mechanisms of Work Production and Work Absorption in Muscle" (plenum, 1998). As with these proceedings, this volume contains records of discussions made not only after each presentation but also during the periods of General Discussion, in order that general readers may properly evaluate each presentation and the up-to-date situation of this research field. It was my great pleasure to have Dr. Hugh Huxley, a principal discoverer of the sliding fIlament mechanism in muscle contraction, in this meeting. On my request, Dr. Huxley kindly gave a special lecture on his monumental discovery of myofIlament-lattice structure by X-ray diffraction of living skeletal muscle. I hope general readers to learn how a breakthrough in a specific research field can be achieved.

Download or read book Sliding Filament Mechanism in Muscle Contraction written by Haruo Sugi and published by Springer Science & Business Media. This book was released on 2007-04-27 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sliding Filament Mechanism in Muscle Contraction: Fifty Years of Research covers the history of the sliding filament mechanism in muscle contraction from its discovery in 1954 by H.E. Huxley through and including modern day research. Chapters include topics in dynamic X-ray diffraction, electron microscopy, muscle mechanisms, in-vitro motility assay, cardiac versus smooth muscle, motile systems, and much more.

Download or read book Role of the C terminal Region of Cardiac Troponin I in Thin Filament Regulation written by Zhiqun Zhou and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abnormal contraction and/or relaxation of cardiac muscle can cause heart diseases, heart failure, or even death. Contractile behavior of cardiac muscle is regulated by a series of Ca2+-induced structural transitions of troponin. These Ca2+-induced structural transitions regulate the alternating interactions between myosin heads and actin, but the detailed mechanisms of the regulation remain unclear. The long-term goal is to uncover the molecular basis of the Ca2+-induced protein structure transitions that underlie the regulation of cardiac function and to understand how these are altered in the diseased state. The overall objective of this work is to define the detailed dynamic and kinetic mechanisms of Ca2+-induced cardiac thin filament activation/deactivation, specific C-terminal of cTnI in the reconstituted preparations and determine how it is affected by troponin phosphorylation and cardiomyopathy mutations found in cTnI. The central hypothesis of this work is that different functional regions of cTnI play different roles in regulating dynamics and kinetics of the thin filament. We tested our hypothesis by monitoring the structural dynamic and kinetic transitions using various fluorescence spectroscopic techniques. Specific Aim 1 was designed to determine the dynamic and kinetic of each function region of C terminal of cTnI within reconstituted thin filament. Specific Aim 2 was designed to determine the structural and kinetic effects of selected hypertrophy cardiomyopathy (HCM) related cTnI mutations on the regulatory switching activity of cTnI within reconstituted thin filament. Specific Aim 3 was designed to determine the structural and kinetic effects of PKC-dependent phosphomimetic mutations on C-cTnI within reconstituted thin filament. Our findings reveal that each functional region of C-terminal of cTnI plays unique dynamic and kinetic roles in regulating Ca2+-induced crossbridge attachment/detachment; HCM-related mutations and PKC phosphomimetic mutations on C-cTnI modulate the dynamic and kinetic transitions in unique and various ways; the fly casting mechanism that normally underlies deactivation is preserved in spite of mutations. The positive impact of this work is that it provides a more detailed understanding of the mechanism of cardiac muscle regulation, which is important for understanding the molecular basis of disease-causing mutations and the possibility of rational therapeutic intervention.

Download or read book The Effects of Varying the Level of Thin Filament Activation in the Regulation of Muscle Contraction written by Carl A. Morris and published by . This book was released on 1999 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Biophysics written by and published by Academic Press. This book was released on 2012-04-12 with total page 3533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biophysics is a rapidly-evolving interdisciplinary science that applies theories and methods of the physical sciences to questions of biology. Biophysics encompasses many disciplines, including physics, chemistry, mathematics, biology, biochemistry, medicine, pharmacology, physiology, and neuroscience, and it is essential that scientists working in these varied fields are able to understand each other's research. Comprehensive Biophysics, Nine Volume Set will help bridge that communication gap. Written by a team of researchers at the forefront of their respective fields, under the guidance of Chief Editor Edward Egelman, Comprehensive Biophysics, Nine Volume Set provides definitive introductions to a broad array of topics, uniting different areas of biophysics research - from the physical techniques for studying macromolecular structure to protein folding, muscle and molecular motors, cell biophysics, bioenergetics and more. The result is this comprehensive scientific resource - a valuable tool both for helping researchers come to grips quickly with material from related biophysics fields outside their areas of expertise, and for reinforcing their existing knowledge. Biophysical research today encompasses many areas of biology. These studies do not necessarily share a unique identifying factor. This work unites the different areas of research and allows users, regardless of their background, to navigate through the most essential concepts with ease, saving them time and vastly improving their understanding The field of biophysics counts several journals that are directly and indirectly concerned with the field. There is no reference work that encompasses the entire field and unites the different areas of research through deep foundational reviews. Comprehensive Biophysics fills this vacuum, being a definitive work on biophysics. It will help users apply context to the diverse journal literature offering, and aid them in identifying areas for further research Chief Editor Edward Egelman (E-I-C, Biophysical Journal) has assembled an impressive, world-class team of Volume Editors and Contributing Authors. Each chapter has been painstakingly reviewed and checked for consistent high quality. The result is an authoritative overview which ties the literature together and provides the user with a reliable background information and citation resource

Download or read book Anatomy Physiology written by Lindsay Biga and published by . This book was released on 2019-09-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A version of the OpenStax text

Download or read book Dilated Cardiomyopathy written by Gianfranco Sinagra and published by Springer. This book was released on 2019-05-17 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book presents a comprehensive overview of dilated cardiomyopathy, providing readers with practical guidelines for its clinical management. The first part of the book analyzes in detail the disease’s pathophysiology, its diagnostic work up as well as the prognostic stratification, and illustrates the role of genetics and gene-environment interaction. The second part presents current and future treatment options, highlighting the importance of long-term and individualized treatments and follow-up. Furthermore, it discusses open issues, such as the apparent healing phenomenon, the early prognosis of arrhythmic events or the use of genetic testing in clinical practice. Offering a multidisciplinary approach for optimizing the clinical management of DCM, this book is an invaluable aid not only for the clinical cardiologists, but for all physicians involved in the care of this challenging disease.

Download or read book Tropomyosin written by Peter Gunning and published by Springer Science & Business Media. This book was released on 2009-09-30 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recent review of one of my grant applications commented on the ‘rediscovery of tropomyosin’. I was tempted to write back in my rebuttal to the reviewer that I didn’t realise it had been lost. Uncharacteristic maturity prevailed and I resisted the temptation, but I was struck by the underlying observation that research on the str- ture and function of tropomyosin has been somewhat invisible, particularly in terms of the cytoskeleton isoforms. So, how can it be that one of the two major components of the actin filament has been so thoroughly overlooked? I suspect that the answer is disappointingly pedestrian. Whereas the biochemistry of the 1980s revealed the potential of tropomyosin isoforms to diversify the function of actin filaments, the subsequent disenchantment with isoform biology in general in the 1990s inhibited growth of this field. With the development of more sophisticated experimental - proaches we are now seeing a growing realisation of the importance of tropomyosin in regulating actin filaments beyond its pivotal role in muscle contraction. The opportunity to edit this book came at a time when we had written several reviews on different aspects of tropomyosin function and I had just finished the background reading for a comprehensive review of tropomyosin biology. I realised that the field was simply beyond the capacity of any one person to do the field j- tice.

Download or read book Molecular Biology of The Cell written by Bruce Alberts and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Smith s Anesthesia for Infants and Children E Book written by Peter J. Davis and published by Elsevier Health Sciences. This book was released on 2016-10-15 with total page 1829 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now thoroughly up to date with new chapters, Smith’s Anesthesia for Infants and Children, 9th Edition, by Drs. Peter Davis and Franklyn Cladis, covers the information you need to provide effective perioperative care for any type of pediatric surgery. Leading experts in pediatric anesthesia bring you up to date with every aspect of both basic science and clinical practice, helping you incorporate the latest clinical guidelines and innovations in your practice. Quick-reference appendices: drug dosages, growth curves, normal values for pulmonary function tests, and a listing of common and uncommon syndromes. Outstanding visual guidance in full color throughout the book. Consult this title on your favorite e-reader, conduct rapid searches, and adjust font sizes for optimal readability. More than 100 video demonstrations, including new regional anesthesia videos, echocardiograms of congenital heart lesions, anatomic dissections of various congenital heart specimens with audio explanations, various pediatric surgical operative procedures, airway management, and much more. Table of Contents has been reorganized and new chapters added on statistics, sedation, pediatric obesity, and cardiac critical care pediatrics. A new chapter on regional anesthesia for pediatrics, including video and ultrasound demonstrations online. A new chapter on dermatology, specifically for the anesthesiologist, with more than 100 photos. A new chapter on medical missions to third-world countries, including what you should know before you go. A new Questions chapter provides opportunities for self-assessment. New coverage includes cardiac anesthesia for congenital heart disease, anesthesia outside the operating room, and a new neonatology primer for the pediatric anesthesiologist.

Download or read book The Cytoskeleton written by Thomas Dean Pollard and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cytoskeleton is the intracellular filament system that controls the morphology of a cell, allows it to move, and provides trafficking routes for intracellular transport. It comprises three major filament systems-actin, microtubules, and intermediate filaments-along with a host of adaptors, regulators, molecular motors, and additional structural proteins. This textbook presents a comprehensive and up-to-date view of the cytoskeleton, cataloguing its many different components and explaining how they are functionally integrated in different cellular processes. It starts by laying out the basic molecular hardware, before describing in detail how these components are assembled in cells and linked to neighboring cells and the extracellular matrix to maintain tissue architecture. It then surveys the roles of the cytoskeleton in processes such as intracellular transport, cell motility, signal transduction, and cell division. The book is thus essential reading for students learning about intracellular structure. It also represents a vital reference for all cell and developmental biologists working in this field.

Download or read book Basic Physiology for Anaesthetists written by David Chambers and published by Cambridge University Press. This book was released on 2019-07-25 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: Easily understood, up-to-date and clinically relevant, this book provides junior anaesthetists with an essential physiology resource.

Download or read book Fibrous Proteins Structures and Mechanisms written by David A.D. Parry and published by Springer. This book was released on 2017-01-18 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the readers with an up-to-date review of the design, structure and function of a representative selection of fibrous proteins in both health and disease. The importance of the α-helical coiled coil, a conformational motif based on the heptad repeat in the amino acid sequence of all α-fibrous proteins (and parts of some globular proteins) is underlined by three Chapters devoted to its design, structure, function and topology. Specific proteins covered in the text and which depend on the coiled coil for their structure and function, include the intermediate filament proteins, tropomyosin, myosin, paramyosin, fibrin and members of the spectrin superfamily. Also described are fibrous proteins based on the β-pleated sheet and collagen conformations. Recombinant structural proteins, especially of silk and collagen, are discussed in the context of developing new biomaterials with varied applications. Established researchers and postgraduate students in the fields of protein chemistry, biochemistry and structural biophysics will find Fibrous Proteins: Structures and Mechanisms to be an invaluable collection of topical reviews that describe the basic advances made in the field of fibrous proteins over the past decade. This book, written by recognized authorities in the field, provides a clear account of the current status of fibrous protein research and, in addition, establishes the basis for deciding the most appropriate directions for future activity, including the applications of protein engineering and the commercial exploitation of new biomaterials.

Download or read book Machina Carnis written by Dorothy M. Needham and published by Cambridge University Press. This book was released on 1971-11-30 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an account of the centuries of experiment and speculation that have led to our understanding of how muscles work.

Download or read book An Introduction to Smooth Muscle Mechanics 2nd Edition written by Chun Y. Seow and published by Cambridge Scholars Publishing. This book was released on 2020-11-13 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition is an updated version of an introductory level textbook intended for students who are interested in understanding the mechanical properties of smooth muscle. Compared with skeletal and cardiac muscles, smooth muscle is the least understood in terms of its contraction mechanism and the structure of its contractile apparatus. Nevertheless, it is an important tissue that is vital in many organ functions, such as blood pressure control, intestinal peristalsis, and the emptying of the bladder. Dysfunction of the muscle has been implicated in many diseases such as high blood pressure, asthma, and overactive bladders. This is the only book-length treatment of functional models of a variety of smooth muscle behaviors with their corresponding mathematical descriptions, and offers an easy-to-follow, step-by-step mathematical derivation that will help students to appreciate the muscle cell as a fine-tuned aggregate of mechanisms governed by the fundamental laws of physics. In addition to providing a detailed description of the known subcellular structure and mechanical function of the contractile apparatus of smooth muscle, it also covers experimentation techniques, instrumentation, and data analysis. The book is a must-have information source for anyone interested in smooth muscle cell ultrastructure, physiology, biochemistry, and pharmacology.