The Origin Of A New Progenitor Stem Cell Group In Human Development
Download The Origin Of A New Progenitor Stem Cell Group In Human Development PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get The Origin Of A New Progenitor Stem Cell Group In Human Development book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages.
The Origin of a New Progenitor Stem Cell Group in Human Development
This book presents an overview of a new group of progenitor stem cells. Their origins were originally detected in light- and electron microscopical sections of plastic embedded human embryonal and fetal organs. The distribution of these cells can result in a large quantity of ectopic stem cells. The observation of these ectopic stem cells leads us to postulate the existence of a basic wave of stem cell progenitors. This process proceeds earlier and independently from germ cell migration. This first wave of progenitor stem cell migration initially reaches the peri-aortal AMG-region (Aortal-Mesonephric-Gonadal region). From here, some of these progenitor cells enter the aorta, are distributed through the vascular system and become the embryonal stem cells (reserve cells) in many peripheral tissues. A second part delivers progenitor cells for the adrenal 'anlage'. Within the peripheral Zona definitiva of the adrenal cortex the progenitor cells multiplicate and subsequently leave the adrenal cortex through a gate of the capsule. The progenitor cells arrive at the pre-aortal sympathic plexus ('second brain'). Within the plexus ganglia they form new organ-like clusters, the paraganglia. In a second process the progenitor cells (Chromaffine cells) enter sympathetic nerve bundles. Here an 'axonal migration' starts, which guides the progenitor cells to several peripheral organs. During this migration process the stem cells develop into their final state. In the adrenal cortex the ingrowing nerves guide the stem cells to the adrenal medulla. In the pancreas the ingrowing nerve fibers guide the stem cells to the islets. These newly detected stem cells represent a specific developmental step which is found only in humans.
Stem Cells and the Future of Regenerative Medicine
Author: Institute of Medicine
language: en
Publisher: National Academies Press
Release Date: 2002-01-25
Recent scientific breakthroughs, celebrity patient advocates, and conflicting religious beliefs have come together to bring the state of stem cell researchâ€"specifically embryonic stem cell researchâ€"into the political crosshairs. President Bush's watershed policy statement allows federal funding for embryonic stem cell research but only on a limited number of stem cell lines. Millions of Americans could be affected by the continuing political debate among policymakers and the public. Stem Cells and the Future of Regenerative Medicine provides a deeper exploration of the biological, ethical, and funding questions prompted by the therapeutic potential of undifferentiated human cells. In terms accessible to lay readers, the book summarizes what we know about adult and embryonic stem cells and discusses how to go about the transition from mouse studies to research that has therapeutic implications for people. Perhaps most important, Stem Cells and the Future of Regenerative Medicine also provides an overview of the moral and ethical problems that arise from the use of embryonic stem cells. This timely book compares the impact of public and private research funding and discusses approaches to appropriate research oversight. Based on the insights of leading scientists, ethicists, and other authorities, the book offers authoritative recommendations regarding the use of existing stem cell lines versus new lines in research, the important role of the federal government in this field of research, and other fundamental issues.
Emerging Concepts in Endocrine Structure and Functions
Author: Ebtesam A. Al-Suhaimi
language: en
Publisher: Springer Nature
Release Date: 2022-04-22
This book uniquely presents conceptual understanding as well as advancements in the field of endocrinology. It emphasizes the harmonization between the function and the structure of different endocrine glands in the body. The book's initial chapters introduce hormones' biological synthesis, structure, function, and signaling pathways. The subsequent chapters examine the functional relationship between hypothalamus and pituitary gland and its leading and regulating roles on other endocrine and non- endocrine organs. A separate chapter discusses the synergistic functions of adrenal glands and pineal gland in the circadian rhythm and analyze the role of corticoids in carbohydrate and mineral metabolism. Furthermore, the book addresses the role of growth hormones, prolactin, gonads regulating hormones, adrenocorticotropin, thyroid hormones, parathormone, gluco- and mineral corticoids, insulin and glucagon, Physiology of bone remodeling is presented with the role of parathyroid glands, C cells and vitamin D explaining the bone as an endocrine organ. The regulation of male and female reproductive functions is represented well. Lastly, the book reviews the novel endocrine role and metabolic aspects of adipose tissue as an endocrine tissue and its relationship to inflammatory diseases, insulin resistance and many metabolic disorders. The book introduces key parts for endocrine’s stem cell in each gland is discussed in term of its survival, proliferation, migration, homing, differentiation and its regeneration and remodeling roles.