dc.contributor.author | Boonstra, Kristen | |
dc.date.accessioned | 2016-09-26 17:35:19 (GMT) | |
dc.date.available | 2017-09-27 04:50:10 (GMT) | |
dc.date.issued | 2016-09-26 | |
dc.date.submitted | 2016-09-09 | |
dc.identifier.uri | http://hdl.handle.net/10012/10906 | |
dc.description.abstract | Prior research has indicated a crucial role for apoptotic signaling in skeletal muscle cell differentiation. Although a number of caspases (-3, -8, -9) have been implicated in this process, few prior investigations have identified a role for the most enigmatic member of the caspase family, caspase-2. Due to its unique nuclear localization as well as its purported roles in cell cycle regulation and DNA damage response; caspase-2 is a likely candidate for regulating differentiation. In order to examine the role of caspase-2 in myocyte differentiation, we assessed enzyme activity throughout the time course of C2C12 differentiation. Additionally, we stably transfected C2C12 cells with caspase-2 shRNA to assess the impact of a caspase-2 knockdown on myocyte differentiation. Finally, we identified the subcellular localization of caspase-2 and p21 throughout the early stages of differentiation. Enzyme activity of caspase-2 transiently increased more than two-fold within 24 hours of differentiation induction, with levels returning to normal by day 7, indicating that the enzyme likely plays a role in the differentiation process. Furthermore, knockdown of caspase-2 dramatically impaired myotube formation and induction of cell cycle inhibitor p21 and myogenic regulatory factor myogenin. Caspase-3 activity was also ablated in the caspase-2 knockdown C2C12 cells. Finally, subcellular fractionation of C2C12 cells at early time points in differentiation revealed a nuclear retention of both caspase-2 and p21 throughout the process. Given the nuclear localization of caspase-2 and p21 as well as the impairment in p21 induction in caspase-2 KD cells, we propose that the role of caspase-2 in myocyte differentiation is to regulate p21 induction at the onset of differentiation. Collectively, the results of this study highlight a novel function for caspase-2 in regulating myocyte differentiation. | en |
dc.language.iso | en | en |
dc.publisher | University of Waterloo | en |
dc.subject | caspase-2 | en |
dc.subject | differentiation | en |
dc.subject | cell cycle regulation | en |
dc.title | Examining the role of caspase-2 in skeletal muscle cell differentiation | en |
dc.type | Master Thesis | en |
dc.pending | false | |
uws-etd.degree.department | Kinesiology | en |
uws-etd.degree.discipline | Kinesiology | en |
uws-etd.degree.grantor | University of Waterloo | en |
uws-etd.degree | Master of Science | en |
uws-etd.embargo.terms | 1 year | en |
uws.contributor.advisor | Quadrilatero, Joe | |
uws.contributor.affiliation1 | Faculty of Applied Health Sciences | en |
uws.published.city | Waterloo | en |
uws.published.country | Canada | en |
uws.published.province | Ontario | en |
uws.typeOfResource | Text | en |
uws.peerReviewStatus | Unreviewed | en |
uws.scholarLevel | Graduate | en |