The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells
Purpose: Aberrant activation of the phosphatidylinositol 3'-kinase (PI3K)-Akt signaling pathway is observed in many types of human cancer including triple negative breast cancer (TNBC). Additionally, dysregulation in the homologous recombination (HR)-dependent DNA-repair is associated with TNBC...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-12-01
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| Series: | Journal of Pharmacy & Pharmaceutical Sciences |
| Online Access: | https://journals.library.ualberta.ca/jpps/index.php/JPPS/article/view/30684 |
| _version_ | 1797722238035689472 |
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| author | Gamze Guney Eskiler |
| author_facet | Gamze Guney Eskiler |
| author_sort | Gamze Guney Eskiler |
| collection | DOAJ |
| description | Purpose: Aberrant activation of the phosphatidylinositol 3'-kinase (PI3K)-Akt signaling pathway is observed in many types of human cancer including triple negative breast cancer (TNBC). Additionally, dysregulation in the homologous recombination (HR)-dependent DNA-repair is associated with TNBC phenotype due to BRCA1/2 mutations or HR deficiency. Therefore, the hypothesis of this study was to evaluate the association of PI3K inhibition with HR pathway in TNBC in terms of BRCA1 mutation status. Methods: To examine the potential therapeutic effect of LY294002, an inhibitor of PI3K, on TNBC cell lines with known BRCA1 status, WST-1, annexin V, cell cycle analysis and AO/EB staining were performed. Additionally, RT-PCR and immunofluorescence analysis was used to explore the interaction between the inhibition of PI3K and HR functionality. Results: The findings showed that LY294002 could significantly inhibited the proliferation of TNBC cells. Furthermore, the suppression of PI3K resulted in HR impairment by BRCA1 and RAD51 downregulation and apoptotic cell death by the induction of DNA damage and BAX overexpression. Therefore, LY294002 was more effective in BRCA1-deficient TNBC cells. Conclusions: Consequently, targeted therapies based on the interaction of PI3K inhibition with BRCA1 mutations or HR deficiency in TNBC may be a promising strategy for the treatment of patients with TNBC. |
| first_indexed | 2024-03-12T09:44:38Z |
| format | Article |
| id | doaj.art-ed09e5886bd642fdb49e933b46f00559 |
| institution | Directory Open Access Journal |
| issn | 1482-1826 |
| language | English |
| last_indexed | 2024-03-12T09:44:38Z |
| publishDate | 2019-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Journal of Pharmacy & Pharmaceutical Sciences |
| spelling | doaj.art-ed09e5886bd642fdb49e933b46f005592023-09-02T13:00:36ZengFrontiers Media S.A.Journal of Pharmacy & Pharmaceutical Sciences1482-18262019-12-0122110.18433/jpps30684The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer CellsGamze Guney Eskiler0Department of Medical Biology, Faculty of Medicine, Sakarya University, Sakarya, Turkey.Purpose: Aberrant activation of the phosphatidylinositol 3'-kinase (PI3K)-Akt signaling pathway is observed in many types of human cancer including triple negative breast cancer (TNBC). Additionally, dysregulation in the homologous recombination (HR)-dependent DNA-repair is associated with TNBC phenotype due to BRCA1/2 mutations or HR deficiency. Therefore, the hypothesis of this study was to evaluate the association of PI3K inhibition with HR pathway in TNBC in terms of BRCA1 mutation status. Methods: To examine the potential therapeutic effect of LY294002, an inhibitor of PI3K, on TNBC cell lines with known BRCA1 status, WST-1, annexin V, cell cycle analysis and AO/EB staining were performed. Additionally, RT-PCR and immunofluorescence analysis was used to explore the interaction between the inhibition of PI3K and HR functionality. Results: The findings showed that LY294002 could significantly inhibited the proliferation of TNBC cells. Furthermore, the suppression of PI3K resulted in HR impairment by BRCA1 and RAD51 downregulation and apoptotic cell death by the induction of DNA damage and BAX overexpression. Therefore, LY294002 was more effective in BRCA1-deficient TNBC cells. Conclusions: Consequently, targeted therapies based on the interaction of PI3K inhibition with BRCA1 mutations or HR deficiency in TNBC may be a promising strategy for the treatment of patients with TNBC.https://journals.library.ualberta.ca/jpps/index.php/JPPS/article/view/30684 |
| spellingShingle | Gamze Guney Eskiler The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells Journal of Pharmacy & Pharmaceutical Sciences |
| title | The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells |
| title_full | The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells |
| title_fullStr | The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells |
| title_full_unstemmed | The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells |
| title_short | The Interaction of PI3K Inhibition with Homologous Recombination Repair in Triple Negative Breast Cancer Cells |
| title_sort | interaction of pi3k inhibition with homologous recombination repair in triple negative breast cancer cells |
| url | https://journals.library.ualberta.ca/jpps/index.php/JPPS/article/view/30684 |
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