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dc.contributor.authorChavez, Miquella
dc.date.accessioned2011-06-03T17:27:14Z
dc.date.available2011-06-03T17:27:14Z
dc.date.issued2011-06-03
dc.date.submittedJuly 2009
dc.identifier.urihttp://hdl.handle.net/1928/12630
dc.description.abstractPoor wound healing is a serious medical issue of particular concern in the elderly and people with diabetes. One major obstacle for these patients to achieve complete wound healing is incomplete reepithelialization which is necessary for restoration of barrier function. One molecule that has promising therapeutic value for promoting reepithelialization is epidermal growth factor receptor (EGFR). Using a squamous cell carcinoma cell line (SCC 12F) that expresses moderate levels of EGFR, we investigated the contributions of EGFR activation to reepithelialization, and specifically its roles in modulation of cell-cell junctions. Decreased cell-cell adhesion mediated by adherens junctions and desmosomes is necessary for epithelial outgrowth into the wound area. We find that elevated EGFR levels are necessary for successful reepithelialization in an in vitro model. EGFR activation led to junctional and cytoskeletal disruption, nuclear localization of the junctional protein ß-catenin and upregulation of target genes involved in wound healing. We also find desmosomes and adherens junctions are modulated by different mechanisms. EGF stimulation caused the desmosomal cadherin desmoglein-2 to internalize and enter a recycling pathway, while the adherens junction protein E-cadherin underwent a matrix metalloproteinase-dependent cleavage. We conclude that EGFR can stimulate multiple mechanisms within a given cell type leading to modulation of cadherin function, and that the stimulus is an important determinant in junctional protein fate. Understanding the mechanisms that promote reepithelialization may lead to strategies to improve wound repair in populations predisposed to poor wound healing.en_US
dc.language.isoen_USen_US
dc.subjectkeratinocytesen_US
dc.subjectwound healingen_US
dc.subject.lcshKeratinocytes.
dc.subject.lcshCell junctions.
dc.subject.lcshWound healing.
dc.subject.lcshEpidermal growth factor--Receptors.
dc.titleDynamics of cell-cell junctions in keratinocytesen_US
dc.typeDissertationen_US
dc.description.degreeBiomedical Sciencesen_US
dc.description.levelDoctoralen_US
dc.description.departmentUniversity of New Mexico. Biomedical Sciences Graduate Programen_US
dc.description.advisorHudson, Laurie
dc.description.committee-memberWandinger-Ness, Angela
dc.description.committee-memberOrlando, Robert
dc.description.committee-memberFelton, Linda


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