Characterization of Hypoxia-inducible Factor-1Alpha (HIF-1Alpha) and Its Involvement in Oxygen-dependent Transferrin Expression PDF Download
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Author: Amira F. Mohamed Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Preconditioning to lowered oxygen levels (hypoxia) may occur when an animal is subjected to non-lethal levels of hypoxia and then returned to normoxic conditions. During a subsequent exposure to hypoxia, the pre-exposed animals may exhibit increased tolerance compared to naive animals. I have demonstrated, by analysis of critical PO2's (Pcrit), that zebrafish embryos can be preconditioned to hypoxia. Preconditioned embryos display a lower Pcrit than controls, indicating a heightened ability to endure hypoxic conditions. The role of the hypoxia inducible factor-1 (HIF-1) in promoting hypoxic preconditioning was examined. To determine the role of HIF-1 in preconditioning, embryos deficient in HIF-1alpha (using antisense oligonucleotide morpholinos) were assessed under hypoxic conditions. No significant difference between preconditioning capacities of control- and HIF-1alpha deficient embryos was observed. In addition to assessing Pcrit, a suite of hypoxia responsive genes were analysed by real time PCR. IGFBP-2 showed a significant decrease in expression in the HIF-1alpha deficient embryos, and EPO showed a significant increase in HIF-1alpha deficient embryos. All other genes examined showed no significant change between treated and control embryos.
Author: U. Feige Publisher: Birkhäuser ISBN: 3034890885 Category : Science Languages : en Pages : 487
Book Description
This book will deal with heat shock proteins and more generally with stress-related inducible gene expression as a pleiotropic adaptive response to stress. It presents a textbook-like overview of the field not only to heat shock experts, but to physiologists, pharmacologists, physicians, neuropsychologists and others as well. It is intended to be a state-of-the-art and perspective book rather than an up-to-date presentation of recent data. It should provide a basis for new experimetal approaches to fields at the edge of the classical heat shock field. Drugs, UV irradiation and environmental toxics will be considered as important modulators of the stress response. Radical scavengers such as superoxide dismutases and inducible regulatory proteins of metallic ion status such as ferritin as well as immunophilins and protein disulfide isomerases will be considered within the frame of stress proteins. The potential practical applications of heat shock proteins in toxicology and medicine for the diagnosis, prognosis and eventually therapy of clinical conditions associated with an increased oxidative burden will be outlined. The role of heat shock proteins in the modulation of immune responses will also be included. The book considers heat shock from a broad perspective including fields for which heat-shock may become of importance in the very near future such as cellular responses to environmental stresses and complex stress responses under specific conditions. It was also felt timely to incorporate a whole section on medical and technological applications of stress proteins. The book will be invaluable for all those working on stress and is intended for every "stress laboratory" as a source of knowledge and perspectives.
Author: Publisher: Elsevier ISBN: 0080497195 Category : Science Languages : en Pages : 867
Book Description
The ability of cells to sense and respond to changes in oxygenation underlies a multitude of developmental, physiological, and pathological processes. This volume provides a comprehensive compendium of experimental approaches to the study of oxygen sensing in 48 chapters that are written by leaders in their fields.