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Role of heat shock protein 27 and Lyn tyrosine kinase in regulation of androgen receptor expression and activity in prostate cancer Zardan, Anousheh
Abstract
Prostate Cancer (PCa) is the most common male cancer and the second leading cause of cancer‐related deaths in North America. While many gains have been made in early detection and treatment of localized PCa, many men still die of the metastatic disease. Androgen ablation therapy remains the most effective therapy for patients with advanced disease. While ~80% of patients respond initially to this treatment, most patients progress to Castrate Resistant Prostate Cancer (CRPC) stage. Current literature indicates that CRPC tumours are not uniformly hormone refractory and may remain sensitive to therapies directed against the AR axis. Therefore, several new classes of AR‐targeting agents are now in clinical development, including more potent AR antagonists (MDV3100) and inhibitors of steroidogenesis (abiraterone). Although enthusiasm for this approach remains high, prostate tumour heterogeneity and the inevitable development of resistance dictates a critical need to better understand the mechanisms of resistance in which AR remain active. In the current doctoral thesis role of heat shock protein (Hsp) 27 and Lyn tyrosine kinase in regulation of AR protein expression was investigated. The central hypothesis is that increased expression and activity of Hsp27 and Lyn kinase stabilizes and activates AR protein and leads to prostate cancer progression through promoting prostate cancer cell survival. Three specific objectives were accomplished in this thesis. First, the relationship between Hsp27 and AR was studied. To this end, it was demonstrated that expression and activity of Hsp27 via a nongenomic mechanism regulates AR protein stability, shuttling and transcriptional activity. In the next step, the underlying molecular mechanisms through which Lyn tyrosine kinase regulates AR activity in the castrated environment was investigated. The experiments demonstrated that Lyn kinase regulates AR protein expression and transcriptional activity and that it plays a key role in PCa progression to the castrated resistant stage. Finally, a novel role for Lyn kinase in Epidermal Growth Factor‐mediated (EGF‐mediated) AR activity was defined. The results obtained in this thesis defined new pathways involved in regulation of AR protein stability and justified further investigation of Hsp27 and Lyn kinase as therapeutic targets for CRPC.
Item Metadata
Title |
Role of heat shock protein 27 and Lyn tyrosine kinase in regulation of androgen receptor expression and activity in prostate cancer
|
Creator | |
Publisher |
University of British Columbia
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Date Issued |
2012
|
Description |
Prostate Cancer (PCa) is the most common male cancer and the second leading cause of
cancer‐related deaths in North America. While many gains have been made in early detection
and treatment of localized PCa, many men still die of the metastatic disease. Androgen ablation
therapy remains the most effective therapy for patients with advanced disease. While ~80% of
patients respond initially to this treatment, most patients progress to Castrate Resistant
Prostate Cancer (CRPC) stage. Current literature indicates that CRPC tumours are not uniformly
hormone refractory and may remain sensitive to therapies directed against the AR axis.
Therefore, several new classes of AR‐targeting agents are now in clinical development,
including more potent AR antagonists (MDV3100) and inhibitors of steroidogenesis
(abiraterone). Although enthusiasm for this approach remains high, prostate tumour
heterogeneity and the inevitable development of resistance dictates a critical need to better
understand the mechanisms of resistance in which AR remain active.
In the current doctoral thesis role of heat shock protein (Hsp) 27 and Lyn tyrosine kinase
in regulation of AR protein expression was investigated. The central hypothesis is that increased
expression and activity of Hsp27 and Lyn kinase stabilizes and activates AR protein and leads to
prostate cancer progression through promoting prostate cancer cell survival.
Three specific objectives were accomplished in this thesis. First, the relationship
between Hsp27 and AR was studied. To this end, it was demonstrated that expression and activity of Hsp27 via a nongenomic mechanism regulates AR protein stability, shuttling and
transcriptional activity. In the next step, the underlying molecular mechanisms through which
Lyn tyrosine kinase regulates AR activity in the castrated environment was investigated. The
experiments demonstrated that Lyn kinase regulates AR protein expression and transcriptional
activity and that it plays a key role in PCa progression to the castrated resistant stage. Finally, a
novel role for Lyn kinase in Epidermal Growth Factor‐mediated (EGF‐mediated) AR activity was
defined.
The results obtained in this thesis defined new pathways involved in regulation of AR
protein stability and justified further investigation of Hsp27 and Lyn kinase as therapeutic
targets for CRPC.
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Genre | |
Type | |
Language |
eng
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Date Available |
2013-04-30
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0103441
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2012-05
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International