Author: Frederick Crane Publisher: Springer Science & Business Media ISBN: 1468480294 Category : Science Languages : en Pages : 437
Book Description
The objective of this workshop was to examine the nature of plasma membrane electron transport and how this electron transport contributes to growth of cells. The workshop came at a time when the study of the plasma membrane oxidoreductase activity was beginning to attract more widespread attention from researchers working with both plants and animals. The rapid response of c fos and c myc Proto-oncogene to stimulation of plasma membrane redox activity by external oxidants under scores a potential role of plasma membrane oxidoreductases in growth control. Other experiments with isolated endosomes in dicate emerging roles in endocytosis and lytic processes. Primary attention was focused on trans plasma membrane electron transport which brings about the oxidation of cytosolic, NADH, NADPH or other substrates by electron flow across the plasma membrane to external oxidants including ferric iron, semide hydroascorbate or oxygen. A major theme in the workshop was the relation of this electron flow to pH changes of the cytoplasm or the transfer of protons to the external medium. The presence and role of other oxidoreductases in the plasma membrane was documented, especially in regard to peroxide production. In plant cells this may contribute to cellular defense against invading para sites. A corresponding function in animals has been long known and extensively discussed but was beyond the scope of this workshop.
Author: Frederick L. Crane Publisher: CRC Press ISBN: 9780849369384 Category : Science Languages : en Pages : 306
Book Description
The concept of general oxidoreductase function at the plasma level is new. Oxidoreduction at the Plasma Membrane: Relation to Growth and Transport provides the first truly comprehensive coverage of the oxidoreduction reactions in plasma membranes and the role that can now be attributed to these enzymes in controlling growth and other cell functions in plants and animals. The book describes the nature and orientation of oxidoreductases in plasma membranes; the stimulation of cell growth by oxidants reacting with transplasma membrane electron transport; changes in enzymes in tumor cells; and the basis of the growth effects and oxidoreductase stimulation of membrane transport in relation to known second messenger functions, such as cellular pH changes, calcium transport, protein phosphorylation and oxidation levels of pyridine nucleotides. The book then examines the significance of these enzymes in cell culture, tumor growth, nerve transmission, ion transport, and membrane potential. The book also presents a new approach to understanding the action of antitumor drugs and herbicides. Biochemists, biologists, oncologists, cancer researchers, physiologists, and endocrinologists will find this an indispensible reference source as they conduct studies in this exciting new area.
Author: Han Asard Publisher: Springer Science & Business Media ISBN: 9401726957 Category : Medical Languages : en Pages : 334
Book Description
Oxidation-reduction (i.e. redox) processes at the plasma membrane of any cell have been attracting more and more attention, both in basic and in applied research, since the first workshop dealing with the plasma membrane oxidoreductases was organized in Cordoba, Spain, in 1988. This evolution is evident considering the numerous cell functions performed by plasma membrane redox systems not only in healthy cells but also in cells that escaped from the normal metabolic control (e.g. cancer cells) and cells under attack by pathogens. Plasma membrane redox processes have now been demonstrated to play an essential role in growth control and defense mechanisms of these cells. The great importance of the plasma membrane redox systems originates in the fact that they are located in the membrane which is essentially the site of communication between the living cell and its environment. We may say that the plasma membrane can be considered as the "sensory part" of the cell. No chemical substance can enter the cell interior without interaction with the plasma membrane.
Author: Helmut Sies Publisher: Elsevier ISBN: 0080497160 Category : Science Languages : en Pages : 461
Book Description
Quinones are members of a class of aromatic compounds with two oxygen atoms bonded to the ring as carbonyl groups. This volume covers the role of quinines enzymes in cellular signalling and modulation of gene expression.*Coenzyme Q: Detection and Quinone Reductases*Plasma Membrane Quinone Reductases*Quinones, Cellular Signaling, and Modulation of Gene Expression
Author: Saurabh Bhatia Publisher: CRC Press ISBN: 1771884207 Category : Health & Fitness Languages : en Pages : 422
Book Description
This new volume provides exhaustive knowledge on a wide range of natural products and holistic concepts that have provided promising in the treatment of leishmaniasis. Including the major natural therapies as well as traditional formulations, over 300 medicinal plants and 150 isolated compounds that are reported to have beneficial results in the treatment of the disease are explored in this comprehensive work. This book also acts as an important resource on various anti-inflammatory plants used to treat various inflammatory conditions of the disease.
Author: Y.Y. Leshem Publisher: Springer Science & Business Media ISBN: 9401726833 Category : Science Languages : en Pages : 344
Book Description
The plasma membrane is at once the window through which the cell senses the environment and the portal through which the environment influences the structure and activities of the cell. Its importance in cellular physiology can thus hardly be overestimated, since constant flow of materials between cell and environment is essential to the well-being of any biological system. The nature of the materials mov ing into the cell is also critical, since some substances are required for maintenance and growth, while others, because of their toxicity, must either be rigorously excluded or permitted to enter only after chemical alteration. Such alteration frequently permits the compounds to be sequestered in special cellular compartments having different types of membranes. This type of homogeneity, plus the fact that the wear and tear of transmembrane molecular traffic compels the system to be constantly monitored and repaired, means that the membrane system of any organism must be both structurally complex and dy namic. Membranes have been traditionally difficult to study because of their fragility and small diameter. In the last several decades, however, remarkable advances have been made because of techniques permit ting the bulk isolation of membranes from homogenized cells. From such isolated membranes have come detailed physical and chemical analyses that have given us a detailed working model of membrane. We now can make intelligent guesses about the structural and func tional interactions of membrane lipids, phospholipids, proteins, sterols and water.
Book Description
This volume documents this unique family of cell surface proteins. Despite masquerading as intractable and difficult to clone and characterize, ENOX proteins have and continue to offer remarkable opportunities for research, commercial development and outside confirmation of therapeutic, diagnostic and new paradigms to help explain complex biological processes.
Author: Christer Larsson Publisher: Springer Science & Business Media ISBN: 3642745229 Category : Science Languages : en Pages : 427
Book Description
The plasma membrane forms the living barrier between the cell and its surroundings. For this reason it has a wide range of important functions related to the regulation of the composition of the cell interior and to com munication with the cell exterior. The plasma membrane has therefore attracted a lot of research interest. Until the early 1970's it was only pos sible to study the plasma membrane in situ, its structure e. g. by electron microscopy and its function e. g. by uptake of radioactively labeled com pounds into the intact cell or tissue. The first isolation of plant protoplasts by enzymatic digestion of the cell wall in the early 1970's was an important step forward in that it provided direct access to the outer surface of the plasma membrane. More importantly, T. K. Hodges and R. J. Leonard in 1972 published the description of a method by which a fraction enriched in plasma membranes could be isolated from plant tissues using sucrose gradient centrifugation. As a result, the 1970's saw a leap forward in our understanding of the structurc and function of the plasma membrane. In 1981, S. Widell and C. Larsson published the first of a series of papers in which plasma membrane vesicles of high yield and purity were isolated from a wide range of plant tissues using aqueous polymer two-phase parti tioning.
Author: Frederick Crane
Author: Frederick L. Crane
Author: Han Asard
Author: Helmut Sies
Author: Saurabh Bhatia
Author: Y.Y. Leshem
Author: D. James Morré
Author: Christer Larsson
Author: National Library of Medicine (U.S.)
Author: National Library of Medicine (U.S.)