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The first major comprehensive overview of the anatomical, physiological, evolutionary, and embryological aspects of brain peptides, focusing on peptides described in the past decade. Examines the role of peptides in affecting major homeostatic systems. Presents the methodologies applicable to the study of brain peptides. Summarizes current knowledge of individual peptides.
Metabolism of Brain Peptides discusses neuropeptide metabolism in light of recent research. It describes the processing mechanisms in the production of biologically active peptides. It details distribution of the variety of neuropeptides in the brain and comprehensively reviews the effects of these neuropeptides on behavioral and physiological functions. The book also examines termination mechanisms for the biological activities of neuropeptides in light of recent knowledge of their distribution, their receptors and their possible inactivation enzymes in various functional regions of the brain and at the blood-brain barrier.
Near the end of September 1980, the contributors to Hormonally Active Brain Pep tides: Structure and Function met to discuss their chapters for the monograph. This meeting was the eighth sponsored by the International Foundation for Biochemical Endocrinology and was held at the Hotel Plakir in Dubrovnik, Yugoslavia. Several months were allowed after the meeting for the contributors to revise their manuscripts and for editing. Professor Dr. Vladimir Pantie and the Serbian Academy of Sciences and Arts were in charge of the local arrangements and social activities. The Foundation is grateful for the splendid job that was done and for the out standing scientific, cultural, and social activities. I thank the Serbian Acad emy of Sciences and Arts and the Yugoslav Council of Academies for spon soring my stay in Yugoslavia. I greatly enjoyed giving lectures, visiting laboratories, and discussing research projects in a number of centers in Yugoslavia. A diverse group of topics was presented in Dubrovnik concerning cer tain brain peptides. The topics included "Structure, Function, and Confor mation of Neuropeptides," "Distribution of Peptides in the Brain," "Reg ulation of the Release of Peptide Hormones," "The Active Center of Gonadotropins," "In Vitro Synthesis of Hypothalamic Hormones," "Stud ies on Gonadotropin-Releasing Hormone," "Studies on the Biosynthesis, Release, and Degradation of LH-RH," "Genesis and Properties of Pitu itary ACTH, Prolactin, and Growth Hormone Producing Cells," "Precur sors to Oligopeptide Hormones," and "Stress Effects on Peptide Hormone Synthesis
The first major comprehensive overview of the anatomical, physiological, evolutionary, and embryological aspects of brain peptides, focusing on peptides described in the past decade. Examines the role of peptides in affecting major homeostatic systems. Presents the methodologies applicable to the study of brain peptides. Summarizes current knowledge of individual peptides.
Definition of the barrier The interstitial fluid (rSF) of the brain is separated from the blood by the blood-brain barrier (BBB). This barrier must not be thought of as a single entity or as an absolute restriction to all molecules, but as a multiple structure located at several sites within the brain. The first of these interfaces is located at the endothelium of the brain capillaries. Secondly there is a potential site for interchange on the outer linings of the brain between the dura and the arachnoid membranes. Thirdly, there are the choroid plexuses and the cerebrospinal fluid (CSF) which is in contact with the very permeable internal ependymal lining of the brain (Figure 1. 1). Finally there are areas of the brain which lack a blood-brain barrier. These areas constitute the circumventricu lar organs and have leaky capillaries with a barrier at the ependyma which limits the spread of molecules from those regions (Figure 1. 2). Each of these BBB sites has its own characteristic permeability and transport functions. We will now consider the properties of each of these barrier sites between the blood and the brain. THE CEREBRAL CAPILLARY ENDOTHELIUM Morphology This interface has both the largest surface area and the shortest path length between the blood and the brain rSF. The cerebral capillaries, which at first sight seem little different from the rest of the systemic circulation, are in fact unique to the brain.
Hypo- or hypersecretion, alteration in storage, release, catabolism, and post-translational processing of neuropeptides are associated with the etiology of many diseases affecting the central nervous system (CNS). Various peptides native to the brain and the spinal cord, as well as various synthetic peptides, peptide analogues and peptidomimetics developed as their agonists or antagonists could be useful in the treatment of these CNS maladies. However, peptides face a formidable obstacle in reaching the intended site of action due to the existence of the blood-brain barrier (BBB), a vital element in the regulation of the internal environment of the brain and the spinal cord. After reviews on the role and neuropharmaceutical potential of peptides, properties of the BBB in the context of peptide transport in the CNS and potential transport mechanisms to cross the BBB, this volume discusses the development, present state-of-the-art and future trends of various strategies to overcome this major obstacle to peptide pharmacotherapy involving the CNS. Chapters are devoted to cover invasive approaches that circumvent the BBB by direct administration into the brain or the spinal cord and by transiently opening the tight junctions of or permeabilizing the endothelial cells separating the systemic circulation from the interstitial fluid of the CNS. Subsequently, physiologically based strategies that utilize biological carriers to gain access to the CNS are discussed in detail, followed by methods encompassing prodrug and chemical delivery/targeting strategies, which aim at altering the properties of the peptide to enhance BBB transport, and drug delivery strategies based on peptide vectors. Finally, a comparative evaluation on the present status and perspectives of the techniques is presented.
An update of the larger volume on brain peptides published in 1983, the first seven chapters of this book address general areas of relevance to brain peptides, including biosynthesis, structural characterization, recent studies on receptors and enzymatic degradation, and techniques of measurement and analysis and for defining anatomic distribution of peptides. A chapter by Ruth Siegal reveals new developments in in situ hybridization. The second section examines recent developments with respect to specific neuropeptides, including TRH, which has recently been cloned, new findings on cholecystokin, the elucidation of the VIP gene, and two chapters on the enkephalins and other opioid peptides. Also reviewed are the latest findings on the structure and functions of bombesin and GRP, and the brain-angiotensin system. Of particular interest to psychiatrists is the update on peptides and psychiatry. New to this volume is a review of neurotrophic factors.
This book elucidates the role of brain-gut peptides in neuroendocrine regulation for understanding how these peptides interact with the reproductive neuroendocrine axis and for developing novel therapeutic agents for fertility or contraceptive therapies.
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 Handbook of Biologically Active Peptides presents, for the first time, 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. The Handbook of Biologically Active Peptides is a definitive, all-encompassing reference that will be indispensable for individuals ranging from peptide researchers, to biochemists, cell and molecular biologists, neuroscientists, pharmacologists, and to endocrinologists. Chapters are designed to be a source for workers in the field and will enable researchers working in a specific area to examine other related areas with which they would not ordinarily be familiar.*Chapters are designed to be a source for workers in the field and will enable researchers working in a specific area to examine other related areas that they would not ordinarily be familiar.*Fascinating relationships described in the book include the presence of some peptides originally found in frog skin that persist in the human human and brain where they can affect food intake and obesity.