The Regulation of Stat5A Expression and Its Function in the Developing Mouse Mammary Gland PDF Download
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Author: Sarah Jane Santos
Publisher:
ISBN:
Category : Cellular signal transduction
Languages : en
Pages : 282
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Author: Sarah Jane Santos
Publisher:
ISBN:
Category : Cellular signal transduction
Languages : en
Pages : 282
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Author: Monica M. Richert
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: Elizabeth Wellberg
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Sim2s is a basic helix-loop-helix Per-Arnt-Sim (bHLH-PAS) transcription factor. In Drosophila, the Sim2 homolog, sim, is necessary for cell fate determination during central nervous system (CNS) development. In mammals, both Sim2 isoforms are involved in development of various tissues, including muscle, cartilage, and mammary gland. Loss-of-function studies revealed a role for Sim2s in specifying epithelial cell fate during mammary development and inhibiting growth and invasion of aggressive breast cancer cells. This study determined the role of Sim2s in mammary epithelial cell differentiation. Our hypothesis is that Sim2s is sufficient to promote lactogenic differentiation in vivo, characterized by expression of lactation-specific genes. Two models were used to test this hypothesis: (1) a transgenic mouse, expressing Sim2s under control of the MMTV-LTR, and (2) the mouse mammary epithelial cell line HC11. Together, these models allow analysis of the effect of Sim2s on global mammary gland differentiation and the mechanism through which it accomplishes this in a relatively homogenous population of cells. We determined that precocious expression of Sim2s in vivo is associated with upregulation of a subset of milk protein genes in nulliparous females. During early pregnancy, Sim2s regulation of lactogenic differentiation extended to a larger group of genes. Following pup removal, Sim2s appears to promote survival of alveolar epithelial cells. In vitro, Sim2s expression is necessary for maximal Csn2 expression, as determined by loss-of-function studies. Overexpression of Sim2s is sufficient to enhance prolactin-mediated Csn2 expression. Chromatin immunoprecipitation assays performed in HC11 cells revealed enhanced recruitment of Stat5a and RNA Polymerase II (RNAPII) to the regulatory region of Csn2 in the presence of Sim2s. In addition, Sim2s and RNAPII were found in a complex that was localized to both the promoter and coding region of the Csn2 gene. These studies support the idea that Sim2s is upregulated in a developmental stage-specific manner in the mouse mammary gland to promote the survival and differentiation of alveolar epithelial cells expressing high levels of milk protein genes. Further, Sim2s may regulate the function of a specific subset of alveolar cells by targeting the RNAPII holoenzyme complex to genes expressed during lactogenic differentiation.
Author: Mark Douglas Aupperlee
Publisher:
ISBN:
Category : Breast
Languages : en
Pages : 396
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Author: John A. Mol
Publisher: Springer Science & Business Media
ISBN: 0306468328
Category : Science
Languages : en
Pages : 309
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Book Description
Proceedings of the European Cooperation in the Field of Scientific and Technical Research (COST 825) Symposium on Mammary Gland Biology, held September 16-18, 1999, in Tours, France. It is difficult to overstate the evolutionary and functional significance of mammary tissue in biology. Substantial progress has been made by researchers in various disciplines, particularly over the last fifteen years, towards realizing the potential of this tissue to yield powerful experimental models for morphogenesis and tissue development; for cellular differentiation; for the biosynthesis and secretion of proteins, lipids, small molecules and inorganic salts; and for the coordination and regulation of these processes. More recently, the possibility of exploiting the secretory epithelial cells of mammary tissue as `cell factories' has become a reality and the recombinant production by lactating animals of an increasing number of proteins, valuable both in the pharmaceutical and `nutraceutical' fields, is in progress or under development. Also in this sphere of agricultural production, genetic as well as nutritional technologies are under investigation and exploitation to optimize milk composition for various end-uses - for instance in food process and manufacture. The possibilities of deriving health benefit from the bioactive properties of some of the minor constituents of milk are emerging to counter the highly-publicized negative health impact of excessive consumption of saturated animal fats. In human nutrition and medicine, the mammary gland is both a source of nutrition to the neonate and a potential health threat to the adult female - breast cancer remains the major single cause of female mortality in most developed countries. This volume provides a unique glimpse into our understanding, at the cutting edge of a variety of disciplines, of this versatile and extraordinary tissue, at the birth of the twenty-first century.
Author: Brigid Hogan
Publisher: Cold Spring Harbor Laboratory Press
ISBN:
Category : Nature
Languages : en
Pages : 352
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Book Description
Of mouse development -- Setting up a colony for the production of transgenic mice -- Recovery, culture, and transfer of embryos -- Introduction of new genetic information into the developing mouse embryo -- Iolation of pluripotential stem cell lines -- Techhniques for visualizing genes and gene products -- In vitro culture of eggs, embryos, and teratocarcinoma cels -- Chemicals, supplies, and solutions.
Author: Natalie Gassman
Publisher: Royal Society of Chemistry
ISBN: 1839162066
Category : Science
Languages : en
Pages : 195
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Book Description
Bisphenol A (BPA) is a high production volume endocrine-disrupting chemical present in numerous consumer products. Extensive use of BPA has led to wide-spread contamination in the air, soil, and water, leading to ubiquitous human exposure. Research into BPA has grown exponentially over the past ten years, with numerous modes of action being identified that impact human health and disease development. While BPA has estrogenic effects, emerging literature has identified several non-receptor mediated modes of action, such as epigenetic reprogramming, that can affect the long-term health of the population. This book highlights the multiple modes of action BPA can use to reprogram cells genetically and metabolically. By compiling critical studies in BPA and outlining the connections and disparities in the literature to build a broader understanding of this complex endocrine-disrupting chemical and its impact on the environment and human health, this book is an ideal resource for postgraduates and researchers in a range of disciplines from toxicology to epigenetics and cancer epidemiology.
Author: Jen-Chywan Wang
Publisher: Springer
ISBN: 1493928953
Category : Science
Languages : en
Pages : 387
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Book Description
This timely volume provides a comprehensive overview of glucocorticoids and their role in regulating many aspects of physiology and their use in the treatment of disease. The book is broken into four sections that begin by giving a general introduction to glucocorticoids and a brief history of the field. The second section will discuss the effects of glucocorticoids on metabolism, while the third section will cover the effects of glucocorticoids on key tissues. The final section will discuss general topics, such as animal models in glucocorticoid research and clinical implications of glucocorticoid research. Featuring chapters from leaders in the field, this volume will be of interest to both researchers and clinicians.
Author: Vincent Goffin
Publisher: Springer Science & Business Media
ISBN: 9780792376606
Category : Medical
Languages : en
Pages : 340
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Book Description
Multicellular organisms require a means of intracellular communication to organize and develop the complex body plan that occurs during embryogenesis and then for cell and organ systems to access and respond to an ever changing environmental milieu. Mediators of this constant exchange of information are growth factors, neurotransmmitters, peptide and protein hormones which bind to cell surface receptors and transduce their signals from the extracellular space to the intracellular compartment. Via multiple signaling pathways, receptors of this general class affect growth, development and differentiation. Smaller hydrophobic signaling molecules, such as steroids and non-steroid hormones, vitamins and metabolic mediators interact with a large family of nuclear receptors. These receptors function as transcription factors affecting gene expression, to regulate the multiple aspects of animal and human physiology, including development, reproduction and homeostasis. The aim of this book is to cover various aspects of intracellular signaling involving hormone receptors.
Author:
Publisher: Academic Press
ISBN: 0128033304
Category : Medical
Languages : en
Pages : 476
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Book Description
Molecular Mechanisms That Orchestrate the Assembly of Antigen Receptor Loci, the latest volume in the Advances in Immunology series focuses on the generation of an effective immune response to invading pathogens As B and T lymphocytes are characterized by the expression of antigen receptors that specifically recognize determinants expressed on pathogens, this volume discusses how antigen receptors are synthesized in B and T lymphocytes. Focuses on the generation of an effective immune response to invading pathogens Contains contributions from leading authorities Informs and updates on all the latest developments in the field of immunology
