p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells
Current therapy for advanced prostate cancer is largely based on androgen deprivation and is mostly palliative because all patients eventually relapse with androgen-independent disease. Doxorubicin (Dx), an anthracycline used commonly as a chemotherapeutic agent in relapsed prostate cancer, is a str...
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2002
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01433334_v23_n8_p1289_Martinez http://hdl.handle.net/20.500.12110/paper_01433334_v23_n8_p1289_Martinez |
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paper:paper_01433334_v23_n8_p1289_Martinez2023-06-08T15:11:48Z p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells Vázquez, Elba Susana androgen anthracycline derivative antineoplastic agent antisense oligonucleotide caspase DNA doxorubicin growth factor protein p21 protein p53 virus protein Adenovirus advanced cancer apoptosis article cancer cell culture cancer chemotherapy cancer growth cancer recurrence cancer survival cell cycle cell kinetics concentration response controlled study DNA damage down regulation drug sensitization enzyme activation hormonal regulation hormone inhibition human human cell knockout gene nonhuman oxidative stress palliative therapy priority journal prostate cancer protein expression protein function protein induction regulatory mechanism transactivation Current therapy for advanced prostate cancer is largely based on androgen deprivation and is mostly palliative because all patients eventually relapse with androgen-independent disease. Doxorubicin (Dx), an anthracycline used commonly as a chemotherapeutic agent in relapsed prostate cancer, is a strong inducer of p53 expression and p21CIP1/WAF1 (p21) transactivation. Previous reports suggest that p21 may have a role in the modulation to chemotherapy-induced apoptosis, prostate cancer progression and androgen regulation. In order to investigate if p21 has a pro-survival role in the response of prostate cancer cells to cellular stress, we exposed two androgen-regulated human prostate cancer cell lines (MDA PCa 2b and LNCaP) to Dx and growth factor withdrawal. We then studied expression of p53 and p21, cell-cycle kinetics and apoptosis. We have found that p53 protein accumulated in a dose-and time-dependent manner after Dx treatment, while p21 expression increased over time with low but decreased with high Dx doses. Apoptosis occurred in parallel with p21 down-modulation. Dx treatment of p53 knockout cells demonstrated that p21 induction was strictly p53 dependent. Reduction of p21 levels in prostate cancer cells with an antisense p21 adenovirus resulted in sensitization to Dx and accelerated onset of apoptosis in response to growth factor withdrawal. The evidence presented here also suggests that caspase activation mediates the apoptosis in this system and supports that p21 may modulate the threshold of apoptosis in prostate cancer. These observations may thus provide implications onto the integration of chemotherapy and androgen ablation. Fil:Vazquez, E.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01433334_v23_n8_p1289_Martinez http://hdl.handle.net/20.500.12110/paper_01433334_v23_n8_p1289_Martinez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
androgen anthracycline derivative antineoplastic agent antisense oligonucleotide caspase DNA doxorubicin growth factor protein p21 protein p53 virus protein Adenovirus advanced cancer apoptosis article cancer cell culture cancer chemotherapy cancer growth cancer recurrence cancer survival cell cycle cell kinetics concentration response controlled study DNA damage down regulation drug sensitization enzyme activation hormonal regulation hormone inhibition human human cell knockout gene nonhuman oxidative stress palliative therapy priority journal prostate cancer protein expression protein function protein induction regulatory mechanism transactivation |
| spellingShingle |
androgen anthracycline derivative antineoplastic agent antisense oligonucleotide caspase DNA doxorubicin growth factor protein p21 protein p53 virus protein Adenovirus advanced cancer apoptosis article cancer cell culture cancer chemotherapy cancer growth cancer recurrence cancer survival cell cycle cell kinetics concentration response controlled study DNA damage down regulation drug sensitization enzyme activation hormonal regulation hormone inhibition human human cell knockout gene nonhuman oxidative stress palliative therapy priority journal prostate cancer protein expression protein function protein induction regulatory mechanism transactivation Vázquez, Elba Susana p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells |
| topic_facet |
androgen anthracycline derivative antineoplastic agent antisense oligonucleotide caspase DNA doxorubicin growth factor protein p21 protein p53 virus protein Adenovirus advanced cancer apoptosis article cancer cell culture cancer chemotherapy cancer growth cancer recurrence cancer survival cell cycle cell kinetics concentration response controlled study DNA damage down regulation drug sensitization enzyme activation hormonal regulation hormone inhibition human human cell knockout gene nonhuman oxidative stress palliative therapy priority journal prostate cancer protein expression protein function protein induction regulatory mechanism transactivation |
| description |
Current therapy for advanced prostate cancer is largely based on androgen deprivation and is mostly palliative because all patients eventually relapse with androgen-independent disease. Doxorubicin (Dx), an anthracycline used commonly as a chemotherapeutic agent in relapsed prostate cancer, is a strong inducer of p53 expression and p21CIP1/WAF1 (p21) transactivation. Previous reports suggest that p21 may have a role in the modulation to chemotherapy-induced apoptosis, prostate cancer progression and androgen regulation. In order to investigate if p21 has a pro-survival role in the response of prostate cancer cells to cellular stress, we exposed two androgen-regulated human prostate cancer cell lines (MDA PCa 2b and LNCaP) to Dx and growth factor withdrawal. We then studied expression of p53 and p21, cell-cycle kinetics and apoptosis. We have found that p53 protein accumulated in a dose-and time-dependent manner after Dx treatment, while p21 expression increased over time with low but decreased with high Dx doses. Apoptosis occurred in parallel with p21 down-modulation. Dx treatment of p53 knockout cells demonstrated that p21 induction was strictly p53 dependent. Reduction of p21 levels in prostate cancer cells with an antisense p21 adenovirus resulted in sensitization to Dx and accelerated onset of apoptosis in response to growth factor withdrawal. The evidence presented here also suggests that caspase activation mediates the apoptosis in this system and supports that p21 may modulate the threshold of apoptosis in prostate cancer. These observations may thus provide implications onto the integration of chemotherapy and androgen ablation. |
| author |
Vázquez, Elba Susana |
| author_facet |
Vázquez, Elba Susana |
| author_sort |
Vázquez, Elba Susana |
| title |
p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells |
| title_short |
p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells |
| title_full |
p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells |
| title_fullStr |
p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells |
| title_full_unstemmed |
p21 modulates threshold of apoptosis induced by DNA-damage and growth factor withdrawal in prostate cancer cells |
| title_sort |
p21 modulates threshold of apoptosis induced by dna-damage and growth factor withdrawal in prostate cancer cells |
| publishDate |
2002 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01433334_v23_n8_p1289_Martinez http://hdl.handle.net/20.500.12110/paper_01433334_v23_n8_p1289_Martinez |
| work_keys_str_mv |
AT vazquezelbasusana p21modulatesthresholdofapoptosisinducedbydnadamageandgrowthfactorwithdrawalinprostatecancercells |
| _version_ |
1768543272083390464 |