Myo Inositol Phosphates Phosphoinositides And Signal Transduction

`The heterogeneity of topics ... is very ambitious, and the result is, overall, successful because of the high quality of the individual contributions ... highly recommended.' -American Scientist, from a review of a previous volume Volume 26 examines the emerging areas of signal transduction based on myoinositol phosphates and Ca2+ while focusing on plant and animal responses. Chapters explore synthesis, separation, and identification of different inositol phosphates.

This volume describes the current status of the biology of inositols and phosphoinositides with an emphasis on the development in the area since the publication of volume 26 in 1996 in this series. The progress made in dissecting the genetics, structure and evolution of the seminal enzyme for synthesis of inositol in the biological system has driven the understanding of the enzyme forward. With the current genomic and proteomic tools in place the new role of inositols, inositol phosphates and phosphoinositides in cell signaling or stress response has been explored. These advances are described in this volume and are expected to give new insights into the functional implications of inositol compounds across evolutionary diverse species.

Many of the phospholipases and even the receptor for inositol 1,4,5-trisphosphate have recently been cloned and sequenced and play an important role in neurotransmission. Methods developed in recent years for the study of the enzymes and intermediates involved in the regulation of neuronal signal transduction involving phospholipid turnover are presented in this volume. Techniques for examining the role of phosphoinositides in signal transduction Techniques related to protein kinase C Analysis of inositol phosphates Techniques to analyze phospholipid turnover in the brain

Phosphoinositides play a major role in cellular signaling and membrane organization. During the last three decades we have learned that enzymes turning over phosphoinositides control vital physiological processes and are involved in the initiation and progression of cancer, inflammation, neurodegenerative, cardiovascular, metabolic disease and more. In two volumes, this book elucidates the crucial mechanisms that control the dynamics of phosphoinositide conversion. Starting out from phosphatidylinositol, a chain of lipid kinases collaborates to generate the oncogenic lipid phosphatidylinositol(3,4,5)-trisphosphate. For every phosphate group added, there are specific lipid kinases – and phosphatases to remove it. Additionally, phospholipases can cleave off the inositol head group and generate poly-phosphoinositols, which act as soluble signals in the cytosol. Volume II extends into the role of phosphoinositides in membrane organization and vesicular traffic. Endocytosis and exocytosis are modulated by phosphoinositides, which determine the fate and activity of integral membrane proteins. Phosphatidylinositol(4,5)-bisphosphate is a prominent flag in the plasma membrane, while phosphatidylinositol-3-phosphate decorates early endosomes. The Golgi apparatus is rich in phosphatidylinositol-4-phosphate, stressed cells increase phosphatidylinositol(3,5)-bisphosphate, and the nucleus has a phosphoinositide metabolism of its own. Phosphoinositide-dependent signaling cascades and the spatial organization of distinct phosphoinositide species are required in organelle function, fission and fusion, membrane channel regulation, cytoskeletal rearrangements, adhesion processes, and thus orchestrate complex cellular responses including growth, proliferation, differentiation, cell motility, and cell polarization.

Phosphoinositides (PIs) are minor components of cellular membranes that play critical regulatory roles in several intracellular functions. This book describes the main enzymes regulating the turnover of each of the seven PIs in mammalian cells, some of their intracellular functions and some evidence of their involvement in human diseases. Due to the complex inter-relation between the distinct PIs and the plethora of functions that they can regulate inside a cell, this book is not meant to be a comprehensive coverage of all aspects of PIs signalling but rather an overview on the current state of the field and where it could go from here. Phosphoinositide and inositol phosphates interact with and modulate the recruitment and activation of key regulatory proteins and in doing so control diverse functions including cell growth and proliferation, apoptosis, cytoskeletal dynamics, insulin action, vesicle trafficking and nuclear function. Initially, inositide signaling was limited to the PLC pathway; however, it is now clear that all the seven phosphoinositides and more than 30 different inositol phosphates likely have specific signaling functions. Moreover there is a growing list of proteins that are regulated by inositol signaling. This has raised the question as to how inositol signaling can control diverse processes and yet maintain signaling specificity. Controlling the levels of inositol signaling molecules and their subcellular compartmentalisation is likely to be critical. This meeting will bring together scientists from different backgrounds to discuss how understanding inositol signaling may be used to target complex human diseases that manifest themselves when inositol signaling is deregulated.

The discovery that inositol lipids are integral in cellular signaling mechanisms has been one of the most exciting breakthroughs in recent years. As secondary messengers in a wide variety of tissues and involved processes as diverse as rapid contraction of skeletal muscle, insulin secretion, and the slow activation of cell proliferation in cancer cells, their impact on biochemistry is akin to that of cyclic AMP two decades ago. Drawing together the many strands of research on inositol lipid-mediated signalling and containing contributions by leading authorities in their fields, Inositol Lipids in Cell Signalling is essential for any involved biochemist, cell biologist, or pharmacologist.

Offers a review of developments along with tried and tested methods for isolation, resolution and quantification of inositol phospholipids and inositol polyphosphates in both cells and tissues. This book includes detailed methodology for identification of molecular species of inositol phospholipids, including their phosphates and glycans.

Inositol metabolism has special importance in plant biology.