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Full-Text Articles in Cell Biology

Genetic Analysis Of Ton2 Dependent Processes In Microtubule Organization In Arabidopsis Thaliana, Samantha Nicole Atkinson Oct 2014

Genetic Analysis Of Ton2 Dependent Processes In Microtubule Organization In Arabidopsis Thaliana, Samantha Nicole Atkinson

Theses and Dissertations

Microtubules carry out many functions within the cell. They're used during mitosis and meiosis to move chromosomes to opposite sides of the cell so that cell division can occur. They're also used as structural support for the cell and are involved in establishing the cell shape. Microtubules are also able to reorient from a longitudinal orientation to a transverse orientation in response to gibberellic acid and auxin (two hormones that are involved in cell elongation). The mechanism for how this reorientation occurs is unknown. The TONNEAU2 (TON2) protein is necessary for proper microtubule organization. We looked at how ...


A Rhog/Ilk/Elmo2/Rac1 Pathways Modulates Microtubule Stability, Bradley C. Jackson Sep 2014

A Rhog/Ilk/Elmo2/Rac1 Pathways Modulates Microtubule Stability, Bradley C. Jackson

Electronic Thesis and Dissertation Repository

Integrin-linked kinase (ILK) is a widely expressed scaffold protein important for cell adhesion, migration, and phagocytosis. ILK and its interacting partner, engulfment and cell motility protein 2 (ELMO2), may also modulate microtubule dynamics. Here, I show that sustained microtubule growth and acetylated tubulin levels are reduced in the absence of ILK and, conversely, that exogenous ILK exerts a stabilizing effect on microtubules. Further, exogenous ELMO2, ras homology growth related protein (RHOG) and ras-related C3 botulinum toxin substrate 1 (RAC1) stabilize microtubules in an ILK-dependent manner. Potential downstream effectors of the effect of ILK on microtubule stability include glycogen synthase kinase- ...


Gbetagamma-Microtubule Mediated Mechanism Of Neuronal Differentiation, Jorge Anibal Sierra Fonseca Jan 2014

Gbetagamma-Microtubule Mediated Mechanism Of Neuronal Differentiation, Jorge Anibal Sierra Fonseca

Open Access Theses & Dissertations

Neurodegeneration, a progressive loss of nerve cells (neurons), occurs in many neurological disorders, including Alzheimer's and Parkinson's diseases, as well as in the aging brain. Disruption of microtubules in neurons and the aggregation of proteins associated with them is the hallmark of neurodegeneration. Nevertheless, the cause of this disorder is largely unknown, and no effective drugs are available to treat the disease processes. Therefore, there is a need to understand the molecular mechanisms that drive the assembly and disassembly of microtubules during neurite outgrowth and differentiation. Evidence suggests that nerve growth factor (NGF) induces neurite outgrowth from PC12 ...


Microtubule Motors Drive Nuclear Dynamics And Positioning In Developing Skeletal Muscle Cells, Meredith Hayley Wilson Jan 2014

Microtubule Motors Drive Nuclear Dynamics And Positioning In Developing Skeletal Muscle Cells, Meredith Hayley Wilson

Publicly Accessible Penn Dissertations

Dynamic interactions with the cytoskeleton are essential to move and anchor nuclei during tissue development, and defects resulting in nuclear mispositioning are often associated with human disease, such as muscular dystrophy and myopathy. Skeletal muscle cells are large syncytia formed by fusion of myoblasts, and contain hundreds of nuclei positioned regularly along the length the cell. During muscle cell development, nuclear movement in myotubes requires microtubules, but the mechanisms involved have not been elucidated. Here, we find that nuclei actively translocate through myotubes. As they translocate, they also rotate in three-dimensions. These movements require an intact microtubule cytoskeleton, which forms ...