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Thanatogen expression during involution of the rat ventral prostate after castration
R S Guenette1, L Daehlin, M Mooibroek
1Department of Biochemistry, University of Ottawa, Ontario, Canada.
Abstract:
After castration the rat ventral prostate undergoes regression. This process occurs due to the induction of apoptosis, or active cell death, in the epithelial cells of the gland. Several genes, including TRPM-2, (testosterone repressed prostate message), RVP.1, fos, and myc, have been shown to be induced in the prostate during this process. We have investigated the expression of several other genes that may be associated with apoptosis, including tissue transglutaminase (TGase), poly(ADP)ribose polymerase (PARP), and heat shock protein 27 (Hsp27). Northern hybridization has been used to determine the steady-state mRNA levels of these genes in the ventral prostate after castration, and the time course of induction has been compared to the changes in the steady-state levels of prostate steroid binding protein (PSBP), alpha-tubulin, and TRPM-2 mRNAs. The results show that the mRNAs for PARP, transglutaminase, and Hsp27, in addition to TRPM-2, are induced by androgen ablation in the rat ventral prostate and reach maximum levels between days 3 and 4 after castration. Using in situ hybridization we have established that these genes are expressed in the epithelial cells of the prostate that are known to undergo active cell death; this result suggests that their gene products may be required in the dying cells to ensure that the biochemical and morphological processes of apoptosis are completed appropriately.
Insights
Androgen ablation in rats induces apoptosis in the ventral prostate. Key genes like PARP, transglutaminase, and Hsp27 are upregulated in dying prostate cells, suggesting their role in apoptosis.
Area of Science:
- Molecular Biology
- Cell Biology
- Endocrinology
Background:
- Prostate cancer is a significant health concern.
- Androgen deprivation therapy is a common treatment for prostate cancer.
- Understanding the molecular mechanisms of prostate regression is crucial for developing new therapies.
Purpose of the Study:
- To investigate the expression of apoptosis-associated genes in the rat ventral prostate after castration.
- To determine the role of tissue transglutaminase (TGase), poly(ADP)ribose polymerase (PARP), and heat shock protein 27 (Hsp27) in prostate apoptosis.
Main Methods:
- Northern hybridization to analyze mRNA levels of selected genes.
- In situ hybridization to determine the spatial expression of these genes within the prostate.
Main Results:
- Castration induced apoptosis in rat ventral prostate epithelial cells.
- mRNA levels of PARP, TGase, and Hsp27, along with TRPM-2, were significantly upregulated post-castration.
- Maximum induction of these genes occurred between days 3 and 4 after castration.
- In situ hybridization confirmed gene expression in apoptotic epithelial cells.
Conclusions:
- Androgen ablation triggers apoptosis in the rat ventral prostate.
- PARP, TGase, and Hsp27 are induced during prostate regression and may play essential roles in the apoptotic process.
- These findings provide insights into the molecular mechanisms of programmed cell death in the prostate.