David C. Spray – författare

This is a second edition of a book that provides an overview of the most current findings on the diverse roles played by astrocytes in the function and dysfunction of the central nervous system (CNS), with emphasis on their cellular connections. Astrocytes are highly elaborated cells and likely the only neural cells that simultaneously establish associations with different cellular types. The fine processes of astrocytes are found in practically all nearby cellular types in the CNS, including astrocytes themselves, neurons, oligodendrocytes, microglia, and brain endothelial cells. Such close morphological associations, together with the fact that astrocytes express a multitude of ion channels, transporters, and membrane receptors, endow these cells with the unique capability to sense and influence diverse CNS functions. Disruption of these elaborated connections and altered astrocyte polarization are implicated in numerous pathological conditions, such as epilepsy, stroke, leukodystrophies, Alzheimer’s, and autism, and also certain psychiatric disorders, major depression, and schizophrenia.

This is a second edition of a book that provides an overview of the most current findings on the diverse roles played by astrocytes in the function and dysfunction of the central nervous system (CNS), with emphasis on their cellular connections. Astrocytes are highly elaborated cells and likely the only neural cells that simultaneously establish associations with different cellular types. The fine processes of astrocytes are found in practically all nearby cellular types in the CNS, including astrocytes themselves, neurons, oligodendrocytes, microglia, and brain endothelial cells. Such close morphological associations, together with the fact that astrocytes express a multitude of ion channels, transporters, and membrane receptors, endow these cells with the unique capability to sense and influence diverse CNS functions. Disruption of these elaborated connections and altered astrocyte polarization are implicated in numerous pathological conditions, such as epilepsy, stroke, leukodystrophies, Alzheimer's, and autism, and also certain psychiatric disorders, major depression, and schizophrenia.

This is a second edition of a book that provides an overview of the most current findings on the diverse roles played by astrocytes in the function and dysfunction of the central nervous system (CNS), with emphasis on their cellular connections. Astrocytes are highly elaborated cells and likely the only neural cells that simultaneously establish associations with different cellular types. The fine processes of astrocytes are found in practically all nearby cellular types in the CNS, including astrocytes themselves, neurons, oligodendrocytes, microglia, and brain endothelial cells. Such close morphological associations, together with the fact that astrocytes express a multitude of ion channels, transporters, and membrane receptors, endow these cells with the unique capability to sense and influence diverse CNS functions. Disruption of these elaborated connections and altered astrocyte polarization are implicated in numerous pathological conditions, such as epilepsy, stroke, leukodystrophies, Alzheimer's, and autism, and also certain psychiatric disorders, major depression, and schizophrenia.

A Cytoplasm Connexon or Hemichannel Cytoplasm external loop I - P. M. N-Termlnus Fig. 1. 1. Topology of gap junction channels. (A) Cap junction channels, extending from the cytoplasm of one cell to the cytoplasm of another, are formed by two connexons or hemichannels connected across extracellular space. (B) Each connexon is formed from six connexin subunits, each having four membrane-spanning domains and both amino and carboxyl termini within the cytoplasm. External/oops (I and II} are believed to provide the high affinity interactions between the hemichannels. 4 Gap }unctions in the Nervous System P-region of voltage sensitive nonjunctional molecules; these contributed disulfide 9 channels. And Delmar's group has ob- bridges are presumably involved in intra- tained evidence that intracellular acidifi- connexin and inter-EL loop tertiary struc- cation may result in a conformational ture.An old observation that should be change analogous to the ball and chain repeated stoichiometrically with modern techniques is that gap junction channels model of inactivation of voltage gated ionic can be split into connexons or hemi- channels, whereby the carboxyl terminal channels using hyperosmotic disaccharide portion of connexin43 binds to CL, closing 23 solutions again implying that linkage is the channel. Higher order structure of the channel not covalent. is believed to consist of six connexins form- ing the hemichannel or connexon in a 3.

Astrocytes play diverse roles in central nervous system (CNS) function and dysfunction, and the connections that the astrocyte makes with other cells of the brain are essential for a variety of important neural tasks. Bringing together contributions from international experts at the top of their field, Astrocytes: Wiring the Brain emphasizes cellular connections and surveys the most current findings on astrocyte activity.The first section of the book identifies major astrocyte biomarkers and describes how they define the different connectivity domains. Next, the book examines the role of these connections. It explains how their function can be manipulated under physiological conditions and how dysfunction of the connectivity leads to aberrant brain performance. The final section explores the alterations of glia that have been observed in specific diseases of the brain. These include epilepsy, autoimmune encephalitis, Alzheimer’s disease, autism, and major depression. The book identifies key mechanisms responsible for these alterations.An important and emerging field, astrocytes and their functions are critical to neuroscientists and neurologists, both in academia and in industry, particularly in the search for and development of new drugs to combat a variety of diseases affecting the CNS. As research continues to grow in this area, this volume will spur heightened advances and understanding into the effects of these neural cells on a range of pathologies.