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Full-Text Articles in Life Sciences

The Chromatin Remodeling Protein Atrx In Development And Maintenance Of Mouse Skeletal Tissues, Lauren A. Solomon Jun 2013

The Chromatin Remodeling Protein Atrx In Development And Maintenance Of Mouse Skeletal Tissues, Lauren A. Solomon

Electronic Thesis and Dissertation Repository

Alpha-thalassemia X-linked mental retardation (ATR-X) syndrome is a rare genetic disorder associated with severe developmental delay, mental retardation and craniofacial dysmorphism. This syndrome is caused by mutations in the ATRX gene which encodes a member of the SWI/SNF family of chromatin remodeling proteins. ATR-X patients exhibit dwarfism and skeletal defects, including hand and foot deformities. I hypothesized that the skeletal deformities in ATR-X syndrome are due to a direct role of ATRX in the development of the skeleton. My objective was to characterise skeletal phenotypes observed in three animal models conditionally deficient for ATRX in different skeletal tissues. Mice ...


Subcellular Analysis Of The Disulfide Proteome In P66shc Expressing Nerve Cells, Tyler Cann Jan 2013

Subcellular Analysis Of The Disulfide Proteome In P66shc Expressing Nerve Cells, Tyler Cann

Electronic Thesis and Dissertation Repository

The longevity associated protein p66Shc has been suggested to regulate organismal lifespan through initiation of apoptotic pathways. Following stress-induced translocation into the mitochondria, p66Shc promotes increased reactive oxygen species (ROS) production and triggers poorly defined downstream signaling events that lead to decreased cell viability. Protein disulfide bonding has recently emerged as aROSdependent post-translational modification that regulates protein function and signaling processes. Using the mouse hippocampal HT-22 cell line, I sought to determine the changes in the disulfide proteome associated with p66Shc mediatedROSproduction. Through Redox 2D-SDSPAGEanalysis of mitochondrial and cytosolic extracts, redox sensitive proteins altered by p66Shc mediatedROSformation were identified. Of ...


Regulation And Dynamic Behavior Of The Heat Shock Transcription Factor Hsf-1 In C. Elegans, Elizabeth A. Morton Jan 2013

Regulation And Dynamic Behavior Of The Heat Shock Transcription Factor Hsf-1 In C. Elegans, Elizabeth A. Morton

Publicly Accessible Penn Dissertations

Eukaryotic cells respond to heat stress by activating the transcription factor HSF1. In addition to its role in stress response, HSF1 also functions in protein homeostasis, aging, innate immunity, and cancer. Despite prominent HSF1 involvement in processes pertinent to human health and disease, there are still gaps in our understanding of HSF1. For example, controversy exists regarding the localization of HSF1, the identity of HSF1 regulators, and the function and conservation of heat-induced HSF1 stress granules. Many of the physiological roles for HSF1 have been defined using the model organism Caenorhabditis elegans, yet little is known about how the molecular ...


Effect Of Advanced Age On The Innate Immune Response To Cutaneous Wound Infection, Aleah Lin Brubaker Jan 2013

Effect Of Advanced Age On The Innate Immune Response To Cutaneous Wound Infection, Aleah Lin Brubaker

Dissertations

An estimated 25 billion in US health care expenditure is spent on care of chronic, non-healing wounds. The failure to effectively heal wounds is often compounded by co-morbidities, such as diabetes or obesity. Another major patient population afflicted with chronic wounds are the elderly. Advanced age is associated with a decline in immunologic function that contributes to a poor response to vaccination, infection and tissue injury resulting in prolonged hospital stays and age-related morbidity and mortality. Specifically, clinical observations and laboratory studies have suggested an age-related decline in cutaneous wound healing, marked by protracted wound closure, wound dehiscence and chronic ...