The pharyngeal arches are embryonic structures that develop into the face, neck, a part of the heart, and several endocrine glands in animals. They are thought to have played a key role in vertebrate evolution as their derivatives impact the mode of feeding and breathing. Moreover, perturbation in pharyngeal arch development is associated with several major groups of birth defects in humans. During early embryonic development, cells from all three germ layers come together to assemble the pharyngeal arches. Subsequently, the pharyngeal arches undergo growth, morphogenesis, and cell type differentiation to give rise to musculoskeletal, cardiovascular, neural, and glandular components. These processes are guided by interactions amongst different tissues, via signaling molecules. A large number of genes, with a complex network of regulatory relationships, govern each aspect of pharyngeal arch development. With the advance of molecular genetics tools in model organisms such as mice, we are beginning to understand the molecular and cellular mechanisms underlying development of the pharyngeal arches and related birth defects. This eBook will provide an introduction into development of the pharyngeal arch system, with a detailed discussion on the genetic regulation of this process.

Among the offspring of humans and other animals are occasional individuals that are malformed in whole or in part. The most grossly abnormal of these have been referred to from ancient times as monsters, because their birth was thought to foretell doom; the less severely affected are usually known as anomalies. This volume digs deeply into the cellular and molecular processes of embryonic development that go awry in such exceptional situations. It focuses on the physical mechanisms of how genes instruct cells to build anatomy, as well as the underlying forces of evolution that shaped these mechanisms over eons of geologic time. The narrative is framed in a historical perspective that should help students trying to make sense of these complex subjects. Each chapter is written in the style of a Sherlock Holmes story, starting with the clues and ending with a solution to the mystery.

This monograph, for the first time, presents a comprehensive overview of different mechanisms of immune dysfunction in cancer as well as therapeutic approaches to their correction. It discusses a number of new mechanisms that have never been discussed in a monograph before: T-cell inhibitory molecules, regulatory tolerogenic DCs, and signaling pathways in antigen-presenting cells involved in T-cell tolerance. There is now a pressing need to discuss the already described and newly emerging mechanisms to see how they can be put together in a more or less cohesive structure and how they can help to improve immune response to tumors.

During evolution the vertebrate head has acquired a number of unique features including specialized paired sense organs and cranial sensory ganglia. These evolutionary novelties arise from discrete thickenings of the head ectoderm known as cranial placodes. They include the adenohypophyseal, olfactory, lens, trigeminal, profundal, otic, epibranchial and lateral line placodes. While distinct in the derivatives and cell types they will form, all cranial placodes originate from a common preplacodal domain surrounding the anterior neural plate. Recent evidence suggests that the induction of this pre-placodal domain and its subsequent subdivision into individual placodes with specific identities is a multi-step process. Here we describe the development of these placodes and their derivatives and summarize recent advances in the characterization of the repertoire of transcription factors underlying their development. We also review recent studies that have started to address the role of several classes of signaling molecules in placode induction and segregation, including Bone Morphogenetic Proteins, Fibroblast Growth Factors and Wnt molecules.Table of Contents: Introduction / Cranial Placodes and Their Derivatives / Molecular Identity of Cranial Placodes / Induction and Segregation of the Cranial Placodes / Conclusion / Acknowledgments / References / Author Biographies

Receptor tyrosine kinases are cell-surface receptors that respond to numerous hormones and growth factors, including insulin, insulin-like growth factors, epidermal growth factor, and nerve growth factor. They activate highly conserved intracellular signaling pathways that regulate cell proliferation, differentiation, and metabolism, playing essential roles in developing and adult animals. This book examines the nature of these receptors and their ligands, the molecular mechanisms that they regulate within cells, and the roles of the receptors in normal physiology and control of embryogenesis. It also discusses how dysfunction of these mechanisms can contribute to cancer and other diseases.

This volume explores the richness of contemporary developmental biology, in addition to the organismal, cellular and molecular aspects of animal development.

The neural crest is a remarkable embryonic population of cells found only in vertebrates and has the potential to give rise to many different cell types contributing throughout the body. These derivatives range from the mesenchymal bone and cartilage comprising the facial skeleton, to neuronal derivatives of the peripheral sensory and autonomic nervous systems, to melanocytes throughout the body, and to smooth muscle of the great arteries of the heart. For these cells to correctly progress from an unspecifi ed, nonmigratory population to a wide array of dynamic, differentiated cell types-some of which retain stem cell characteristics presumably to replenish these derivatives-requires a complex network of molecular switches to control the gene programs giving these cells their defi ning structural, enzymatic, migratory, and signaling capacities. This review will bring together current knowledge of neural crest-specifi c transcription factors governing these progressions throughout the course of development. A more thorough understanding of the mechanisms of transcriptional control in differentiation will aid in strategies designed to push undifferentiated cells toward a particular lineage, and unraveling these processes will help toward reprogramming cells from a differentiated to a more naive state. Table of Contents: Introduction / AP Genes / bHLH Genes / ETS Genes / Fox Genes / Homeobox Genes / Hox Genes / Lim Genes / Pax Genes / POU Domain Genes / RAR/RXR Genes / Smad Genes / Sox Genes / Zinc Finger Genes / Other Miscellaneous Genes / References / Author Biographies

The unique architecture and physiology of the mammalian intestine, together with a tightly coordinated regulatory system, allows for the handling and absorption of as much as 9 L of fluid a day with 98% or greater efficiency. Advances in the past 40 years have made inroads into revealing the intricacies and interplay of numerous ion transporters and their modulators that are responsible for intestinal electrolyte and water transport. Studies of two devastating diseases, the virulent infectious disease cholera and the autosomal recessive disease cystic fibrosis, were largely responsible for this information explosion. These advances have been critical in the development of new therapeutic strategies to combat life-threatening diseases of varying etiologies ranging from enteric infections to cystic fibrosis and inflammatory bowel diseases. Yet, the story is far from complete, and progress needs to continue on translating information gained from reductionistic cell and tissue culture models, in vivo models, and ultimately human studies and on improving therapeutic approaches. This book reviews the current status of our knowledge of fluid transport across the intestine, including the complexities of transcellular and paracellular ion transport down the length of the intestine and how aberrations of normal physiological processes lead to disease. Table of Contents: Overview / Epithelial Cell and Tissue Architecture / Principles of Transepithelial Electrolyte and Water Movement / Intestinal Architecture and Electrolyte Transport / Electrolyte Transporters--Pumps, Carriers, and Channels / Water Transport / Regulation / Intestinal Disorders and Advances Toward Better Treatment of Intestinal Disorders / Conclusion / References

Though we have other distinguishing characteristics (walking on two legs, for instance, and relative hairlessness), the brain and the behavior it produces are what truly set us apart from the other apes and primates. And how this three-pound organ composed of water, fat, and protein turned a mammal species into the dominant animal on earth today is the story John S. Allen seeks to tell. Adopting what he calls a "bottom-up" approach to the evolution of human behavior, Allen considers the brain as a biological organ; a collection of genes, cells, and tissues that grows, eats, and ages, and is subject to the direct effects of natural selection and the phylogenetic constraints of its ancestry. An exploration of the evolution of this critical organ based on recent work in paleo anthropology, brain anatomy and neuroimaging, molecular genetics, life history theory, and related fields, his book shows us the brain as a product of the contexts in which it evolved: phylogenetic, somatic, genetic, ecological, demographic, and ultimately, cultural-linguistic. Throughout, Allen focuses on the foundations of brain evolution rather than the evolution of behavior or cognition. This perspective demonstrates how, just as some aspects of our behavior emerge in unexpected ways from the development of certain cognitive capacities, a more nuanced understanding of behavioral evolution might develop from a clearer picture of brain evolution.

This book is an intellectual tour de force: a comprehensive Darwinian interpretation of human development. Looking at the entire range of human evolutionary history, Melvin Konner tells the compelling and complex story of how cross-cultural and universal characteristics of our growth from infancy to adolescence became rooted in genetically inherited characteristics of the human brain.

All study of our evolution starts with one simple truth: human beings take an extraordinarily long time to grow up. What does this extended period of dependency have to do with human brain growth and social interactions? And why is play a sign of cognitive complexity, and a spur for cultural evolution? As Konner explores these questions, and topics ranging from bipedal walking to incest taboos, he firmly lays the foundations of psychology in biology.

As his book eloquently explains, human learning and the greatest human intellectual accomplishments are rooted in our inherited capacity for attachments to each other. In our love of those we learn from, we find our way as individuals and as a species. Never before has this intersection of the biology and psychology of childhood been so brilliantly described.

"Nothing in biology makes sense except in the light of evolution," wrote Dobzhansky. In this remarkable book, Melvin Konner shows that nothing in childhood makes sense except in the light of evolution.

The transformative wave of Darwinian insight continues to expand throughout the human sciences. While still centered on evolution-focused fields such as evolutionary psychology, ethology, and human behavioral ecology, this insight has also influenced cognitive science, neuroscience, feminist discourse, sociocultural anthropology, media studies, and clinical psychology. This handbook's goal is to amplify the wave by bringing together world-leading experts to provide a comprehensive and up-to-date overview of evolution-oriented and influenced fields. While evolutionary psychology remains at the core of the collection, it also covers the history, current standing, debates, and future directions of the panoply of fields entering the Darwinian fold. As such, The Cambridge Handbook of Evolutionary Perspectives on Human Behavior is a valuable reference not just for evolutionary psychologists but also for scholars and students from many fields who wish to see how the evolutionary perspective is relevant to their own work.

Scientists elucidate the astounding collective sensory capacity of Earth and its evolution through time. Chimeras and Consciousness begins the inquiry into the evolution of the collective sensitivities of life. Scientist-scholars from a range of fields-including biochemistry, cell biology, history of science, family therapy, genetics, microbial ecology, and primatology-trace the emergence and evolution of consciousness. Complex behaviors and the social imperatives of bacteria and other life forms during 3,000 million years of Earth history gave rise to mammalian cognition. Awareness and sensation led to astounding activities; millions of species incessantly interacted to form our planet's complex conscious system. Our planetmates, all of them conscious to some degree, were joined only recently by us, the aggressive modern humans. From social bacteria to urban citizens, all living beings participate in community life. Nested inside families within communities inside ecosystems, each metabolizes, takes in matter, expends energy, and excretes. Each of the members of our own and other species, in groups with incessantly shifting alliances, receives and processes information. Mergers of radically different life forms with myriad purposes-the "chimeras" of the title-underlie dramatic metamorphosis and other positive evolutionary change. Since early bacteria avoided, produced, and eventually used oxygen, Earth's sensory systems have expanded and complexified. The provocative essays in this book, going far beyond science but undergirded by the finest science, serve to put sensitive, sensible life in its cosmic context.

The vascular endothelium lining the inner surface of blood vessels serves as the first interface for circulating blood components to interact with cells of the vascular wall and surrounding extravascular tissues. In addition to regulating blood delivery and perfusion, a major function of vascular endothelia, especially those in exchange microvessels (capillaries and postcapillary venules), is to provide a semipermeable barrier that controls blood-tissue exchange of fluids, nutrients, and metabolic wastes while preventing pathogens or harmful materials in the circulation from entering into tissues. During host defense against infection or tissue injury, endothelial barrier dysfunction occurs as a consequence as well as cause of inflammatory responses. Plasma leakage disturbs fluid homeostasis and impairs tissue oxygenation, a pathophysiological process contributing to multiple organ dysfunction associated with trauma, infection, metabolic disorder, and other forms of disease. In this book, we provide an updated overview of microvascular endothelial barrier structure and function in health and disease. The discussion is initiated with the basic physiological principles of fluid and solute transport across microvascular endothelium, followed by detailed information on endothelial cell-cell and cell-matrix interactions and the experimental techniques that are employed to measure endothelial permeability. Further discussion focuses on the signaling and molecular mechanisms of endothelial barrier responses to various stimulations or drugs, as well as their relevance to several common clinical conditions. Taken together, this book provides a comprehensive analysis of microvascular endothelial cell and molecular pathophysiology. Such information will assist scientists and clinicians in advanced basic and clinical research for improved health care. Table of Contents: Acknowledgments / Introduction / Structure and Function of Exchange Microvessels / Methods for Measuring Permeability / The Endothelial Barrier / Signaling Mechanisms in the Regulation of Endothelial Permeability / Endothelial Barrier Protectors / Pathophysiology and Clinical Relevance / Conclusion / References

This book aims at providing an overview and in depth analysis of recent developments in stem cell research and therapy. It is composed of recently published review articles that went through peer-review process. Stem cells are the building blocks of the body. They can develop into any of the cells that make up our bodies. Stem cells hold a great deal of hope for the treatment of a broad range of diseases and injuries, spanning from cancers, diabetes, genetic diseases, graft-versus-host disease, eye, heart and liver diseases, inflammatory and autoimmune disorders, to neurological diseases and injuries, particularly neurodegenerative diseases. These include Alzheimer's and Parkinson's diseases, cerebral strokes, and traumatic brain and spinal cord injuries. Therefore, Stem cell research is as important for the understanding of the physio- and pathology of the body, as well as for the development and therapy, including the nervous system. Volume IV provides an overview and in depth analysis of recent developments on the role and functions of newly generated neuronal cells of the adult brain in the physio- and pathology of the nervous system. It further emphasises the tremendous potential of adult neural stem cells, as a promising model, for cellular therapy and regenerative medicine.

Platelets are essential mediators of the physiologic process of hemostasis and pathologic thrombosis. While platelets do not interact with vascular walls under normal conditions, vascular injury or inflammation result in a coordinated series of events including platelet adhesion, aggregation, and promotion of coagulation. In this review, we describe the primary mechanisms involved in these responses in various vascular beds of both macro- and microvessels, and outline key unresolved aspects of these important interactions.Table of Contents: Introduction / General Characteristics of Platelets / Platelet Adhesion to Vascular Walls / Platelet Aggregation / Platelet Recruitment and Blood Coagulation / Arterial, Venous, and Microvascular Hemostasis/Thrombosis / Summary

For millennia, Africans have lived on the African continent, in close contact with the diversities of nature: floral, faunal and human; and in so doing they have developed cultures, values, attitudes and perspectives to the problems, ethical and otherwise, that have arisen from the existential pressures of their situation. The problem, however, is that such values and perspectives do not necessarily form coherent ethical theories. Theory-making is a second order activity requiring a certain amount of leisure and comfort which the existential conditions of life on the African continent have not easily permitted in the retrospect-able past. The elements of African bioethics are to be found in its cultural values, traditions, customs and practices. These are research-able, highlight-able and usable by those who would. The bioethical problems of our current global existential situation are such that all possible solutions, no matter their provenance, ought to be tried. Western culture has far too loud a voice combined with deaf ears in contemporary ethical discourse. But it should never be forgotten that other cultures have their own word to say and that alternative values, ways of thinking and practices exist, and attempt should always be made to bring these out and to highlight them, if they could possibly contribute to the satisfactory solution of a global problem. This book brings together various papers on bioethical issues and problems, written at different times, some previously published, each of which attempts to bring out some African elements, perspective or concern. The African narrative style predominates through these essays but their framing conforms, more or less, to the Western paradigm for presenting academic issues.

The fibroblast growth factors (FGFs) represent one of the relatively few families of extracellular signalling peptides that have been shown in recent decades to be key regulators of metazoan development. FGFs are required for multiple processes in both protostome and deuterostome groups. Given the wide range of regulatory roles attributed to the FGFs, it is perhaps not surprising that misregulation of this signalling pathway has been implicated in a number of human disease conditions. The focus of the present review is to look at the fundamental components of the FGF pathway and illustrate how this highly conserved regulatory cassette has been deployed to regulate multiple, diverse processes during vertebrate development. This review will explore examples from several vertebrate model organisms and include discussions of the role of FGF signalling in regulating the establishment of the mesoderm, neural patterning, morphogenesis, myogenesis, limb development, and the establishment of right-left asymmetry.Table of Contents: Introduction / FGF Ligands / FGF Receptors / Heparan Sulphate Proteoglycans / FGF Signal Transduction / Regulators / Integration with Other Signalling Pathways / Mesoderm Induction / Neural Induction / FGF Signalling and Posterior Neural Patterning / FGF Signalling at the Isthmic Organizer / FGF Signalling at the Anterior Neural Ridge / Morphogenesis / Somitogenesis / FGF and Myogenesis / Limb Development / FGF and Left-Right Asymmetry / Perspectives / References / About the Authors

The Wnt/ -catenin signaling pathway is a key regulator of cell fate specification, differentiation, and growth in multiple systems throughout the animal kingdom. In vertebrate posterior neural development, Wnt/ -catenin signaling controls this complex multistep process. It initially induces the posterior regions of the nervous system, including the mid-hindbrain border, hindbrain, spinal cord and neural crest, and then subsequently fine-tunes the pattern of each region and determines the different cell fates within them. In this review, we explore the function of the Wnt/ -catenin pathway during the formation of these specific posterior neural regions. We have examined the important transcriptional targets of the Wnt/ -catenin pathway acting downstream to mediate its morphogenetic activity. Different regulatory networks are activated in different posterior neural regions, and these networks induce specific neural cell types in each region. Eludidating how each of these networks specify different cell fates is crucial for understanding the basic tenets of how Wnt morphogenetic activity induces the posterior nervous system during the earliest stages of vertebrate development. Table of Contents: Introduction / Making the Neural Rear / Wnt Morphogenetic Activity in Neural Posterior Induction / Induction of the Midbrain-Hindbrain Border / Induction of the Hindbrain / Induction of the Spinal Cord / Downstream of Wnt: Hindbrain or Spinal Cord? / Neural Crest Induction / Anti-Wnt Anterior Determinants / The Role of Mesoderm and Specific Wnt Ligands in Neural Patterning / Concluding Remarks / References

Technological advances have given us increased life expectancy, conquest of disease and hunger, provided us the wherewithal to explore other worlds, and our inner selves. Yet, we owe a certain pessimism to the materialism of the mind. Beyond Biology transposes brain science from mere description of diseases and lesions, into a realm of limitless possibility. The brain, mediator for all behavior, is the springboard of all human capacity, taking us far beyond our physical and biological limitations. Do computers and other tools extend mental and physical capacities? For science, music, architecture, all of civilization, our brain is their launching pad. Beyond Biology views physicality as the mere beginning of human potential, not its end. Scientific understanding, far from being just reductionist, must ignite a new spiritual awakening. This work seeks to transport the reader into the metaphysical world through the lens of brain biology