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Medical Sciences

Molecular

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Full-Text Articles in Cell Biology

The Role Of Integrin Mediated Adhesion And Signaling During Xenopus Retinal Development , Ming Li Jan 2003

The Role Of Integrin Mediated Adhesion And Signaling During Xenopus Retinal Development , Ming Li

Retrospective Theses and Dissertations

Integrins are the major family of cell adhesion receptors for extracellular matrix (ECM) components and are involved in cell-cell and cell-ECM adhesion. Integrins also participate in cytoskeletal rearrangements, activation of signal transductions, and co-regulation of growth factor activities.;In this dissertation, I have investigated the role of beta1 integrin-mediated adhesion and signaling during early Xenopus retinal development. First, I characterized the expression patterns of focal adhesion associated proteins, beta1 integrin, talin, vinculin, paxillin and phosphotyrosine in retinal glial cell line XR1 and in the developing Xenopus retina. These proteins are colocalized at focal adhesions located at the termini of F-actin ...


Nitric Oxide In Astrocyte-Neuron Signaling , Nianzhen Li Jan 2002

Nitric Oxide In Astrocyte-Neuron Signaling , Nianzhen Li

Retrospective Theses and Dissertations

Astrocytes, a subtype of glial cell, have recently been shown to exhibit Ca2+ elevations in response to neurotransmitters. A Ca 2+ elevation can propagate to adjacent astrocytes as a Ca2+ wave, which allows an astrocyte to communicate with its neighbors. Additionally, glutamate can be released from astrocytes via a Ca2+ -dependent mechanism, thus modulating neuronal activity and synaptic transmission.;In this dissertation, I investigated the roles of another endogenous signal, nitric oxide (NO), in astrocyte-neuron signaling. First I tested if NO is generated during astrocytic Ca2+ signaling by imaging NO in purified murine cortical astrocyte cultures. Physiological concentrations of a ...