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A complete understanding of how behavior is controlled by the nervous system must include detailed knowledge of the underlying circuitry and neurochemistry. The parasitic nematode Ascaris suum, with only 298 neurons, is an exceptionally well-suited system in which to obtain this level of detail. Whereas a great deal of the cytoarchitecture, electrophysiological properties, and classical transmitter phenotypes of individual cells has been described, much is still unknown about the great diversity of modulatory neuropeptides. A description of their structure and activity is essential for understanding the in the control of behavior. In this thesis, we use a combination of mass spectrometry (MS), bioinformatics, and molecular biology to discover and localize neuropeptides in the motor nervous system. The peptides are then chemically synthesized and tested for bioactivity. Direct profiling of single neurons by matrix assisted laser desorption/ ionization time-of-flight (MALDI-TOF) MS identified diverse and interesting patterns of peptide expression. In parts one and two, we targeted ventral cord motorneurons that innervate the somatic body wall musculature responsible for locomotion. In the cholinergic excitatory motorneurons, two different peptide expression profiles were observed. The first was found in neurons responsible for forward locomotion, and the second, a completely different set of peptides, was present in neurons responsible for backwards locomotion. Aside from confirming the identity of previously known peptides, all of which had been shown to be bioactive, we also identified six novel peptides. In the second part, in the GABAergic inhibitory motorneurons we found a novel bioactive peptide with potent inhibitory effects on muscle contraction. In the third part, we mapped peptide expression in the 4 GABAergic RME ring motorneurons neurons of the head. The peptides in these neurons, of which 7 were novel, were different from those in the ventral cord inhibitors. Three peptides encoded by one of the transcripts had inhibitory effects on muscle contraction. This is the first study to identify peptide expression patterns in the motor neurons. In this study we have not only found novel peptides but also identified the peptides that are likely to be most relevant to locomotion in A. suum.
The need to continually discover new agents for the control or treatment of invertebrate pests and pathogens is undeniable. Agriculture, both animal and plant, succeeds only to the extent that arthropod and helminth consumers, vectors and pathogens can be kept at bay. Humans and their companion animals are also plagued by invertebrate parasites. The deployment of chemical agents for these purposes inevitably elicits the selection of resistant populations of the targets of control, necessitating a regular introduction of new kinds of molecules. Experience in other areas of chemotherapy has shown that a thorough understanding of the biology of disease is an essential platform upon which to build a discovery program. Unfortunately, investment of research resources into understanding the basic physiology of invertebrates as a strategy to illuminate new molecular targets for pesticide and parasiticide discovery has been scarce, and the pace of introduction of new molecules for these indications has been slowed as a result. An exciting and so far unexploited area to explore in this regard is invertebrate neuropeptide physiology. This book was assembled to focus attention on this promising field by compiling a comprehensive review of recent research on neuropeptides in arthropods and helminths, with contributions from many of the leading laboratories working on these systems.
The definitive guide to peptidomics- a hands-on lab reference The first truly comprehensive book about peptidomics for protein and peptide analysis, this reference provides a detailed description of the hows and whys of peptidomics and how the techniques have evolved. With chapters contributed by leading experts, it covers naturally occurring peptides, peptidomics methods and new developments, and the peptidomics approach to biomarker discovery. Explaining both the principles and the applications, Peptidomics: Methods and Applications: * Features examples of applications in diverse fields, including pharmaceutical science, toxicity biomarkers, and neuroscience * Details the successful peptidomic analyses of biological material ranging from plants to mammals * Describes a cross section of analytical techniques, including traditional methodologies, emerging trends, and new techniques for high throughput approaches An enlightening reference for experienced professionals, this book is sufficiently detailed to serve as a step-by-step guide for beginning researchers and an excellent resource for students taking biotechnology and proteomics courses. It is an invaluable reference for protein chemists and biochemists, professionals and researchers in drug and biopharmaceutical development, analytical and bioanalytical chemists, toxicologists, and others.
Handbook of Biologically Active Peptides, Second Edition, is the definitive, indispensable reference for peptide researchers, biochemists, cell and molecular biologists, neuroscientists, pharmacologists, and endocrinologists. Its chapters are designed to be a source for workers in the field and enable researchers working in a specific area to examine related areas outside their expertise. Peptides play a crucial role in many physiological processes, including actions as neurotransmitters, hormones, and antibiotics. Research has shown their importance in such fields as neuroscience, immunology, pharmacology, and cell biology. The second edition of Handbook of Biologically Active Peptides presents this tremendous body of knowledge in the field of biologically active peptides in one single reference. The section editors and contributors represent some of the most sophisticated and distinguished scientists working in basic sciences and clinical medicine. - Presents all aspects of biologically active peptides in one resource - Features more than 20 sections spanning plant, bacterial, fungal, venom, and invertebrate peptides to general peptides - Includes immunological, inflammatory, cancer, vaccine, and neurotrophic peptides - Discusses peptide precursors, mRNA distribution, processing, and receptors, not just pathophysiological implications
A comprehensive portrayal of the behaviour genetics of the fruit fly (Drosophila melanogaster) and the methods used in these studies.
Written by recognized experts in the study of proteins, Proteomics for Biological Discovery begins by discussing the emergence of proteomics from genome sequencing projects and a summary of potential answers to be gained from proteome-level research. The tools of proteomics, from conventional to novel techniques, are then dealt with in terms of underlying concepts, limitations and future directions. An invaluable source of information, this title also provides a thorough overview of the current developments in post-translational modification studies, structural proteomics, biochemical proteomics, microfabrication, applied proteomics, and bioinformatics relevant to proteomics. Presents a comprehensive and coherent review of the major issues faced in terms of technology development, bioinformatics, strategic approaches, and applications Chapters offer a rigorous overview with summary of limitations, emerging approaches, questions, and realistic future industry and basic science applications Discusses higher level integrative aspects, including technical challenges and applications for drug discovery Accessible to the novice while providing experienced investigators essential information Proteomics for Biological Discovery is an essential resource for students, postdoctoral fellows, and researchers across all fields of biomedical research, including biochemistry, protein chemistry, molecular genetics, cell/developmental biology, and bioinformatics.
The Use of Mass Spectrometry Technology (MALDI-TOF) in Clinical Microbiology presents the state-of the-art for MALDI-TOF mass spectrometry. It is a key reference defining how MALDI-TOF mass spectrometry is used in clinical settings as a diagnostic tool of microbial identification and characterization that is based on the detection of a mass of molecules. The book provides updated applications of MALDI-TOF techniques in clinical microbiology, presenting the latest information available on a technology that is now used for rapid microbial identification at relatively low cost, thus offering an alternative to conventional laboratory diagnosis and proteomic identification systems. Although the main use of the technology has, until now, been identification or typing of bacteria from a positive culture, applications in the field of virology, mycology, microbacteriology and resistances are opening up new opportunities. - Presents updated applications of MALDI-TOF techniques in clinical microbiology - Describes the use of mass spectrometry in the lab, the principles of the technology, preparation of samples, device calibration and maintenance, treatment of microorganisms, and quality control - Presents key information for researchers, including possible uses of the technology, differences between devices, how to interpret results, and future applications - Covers the topic in a systematic and comprehensive manner that is useful to both clinicians and researchers
A reference for investigators in pulmonary toxicology and immunotoxicology and for people involved in administrating and regulating matters related to inhale materials, and serviceable as a textbook for a graduate or advanced undergraduate course in pulmonary immunotoxicology. US researchers from academic and industrial laboratories provide information concerning the effects of various inhaled materials on the immune system of the respiratory tract. They cover basic background concepts including the normal structure and function of the respiratory system and its basic immunology, the major types of pathological consequences that can arise from immunomodulation within the respiratory tract, the specific major classes of airborne agents that are known to alter immune function, and risk assessment. Annotation copyrighted by Book News, Inc., Portland, OR
Invertebrates have proven to be extremely useful model systems for gaining insights into the neural and molecular mechanisms of sensory processing, motor control and higher functions such as feeding behavior, learning and memory, navigation, and social behavior. A major factor in their enormous contributions to neuroscience is the relative simplicity of invertebrate nervous systems. In addition, some invertebrates, primarily the molluscs, have large cells, which allow analyses to take place at the level of individually identified neurons. Individual neurons can be surgically removed and assayed for expression of membrane channels, levels of second messengers, protein phosphorylation, and RNA and protein synthesis. Moreover, peptides and nucleotides can be injected into individual neurons. Other invertebrate model systems such as Drosophila and Caenorhabditis elegans offer tremendous advantages for obtaining insights into the neuronal bases of behavior through the application of genetic approaches. The Oxford Handbook of Invertebrate Neurobiology reviews the many neurobiological principles that have emerged from invertebrate analyses, such as motor pattern generation, mechanisms of synaptic transmission, and learning and memory. It also covers general features of the neurobiology of invertebrate circadian rhythms, development, and regeneration and reproduction. Some neurobiological phenomena are species-specific and diverse, especially in the domain of the neuronal control of locomotion and camouflage. Thus, separate chapters are provided on the control of swimming in annelids, crustaea and molluscs, locomotion in hexapods, and camouflage in cephalopods. Unique features of the handbook include chapters that review social behavior and intentionality in invertebrates. A chapter is devoted to summarizing past contributions of invertebrates to the understanding of nervous systems and identifying areas for future studies that will continue to advance that understanding.