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Protein Kinase C Alpha (PKCα) overexpression leads to a better response to retinoid acid therapy through Retinoic Acid Receptor Beta (RARβ) activation in mammary cancer cells.
- Source :
-
Journal of cancer research and clinical oncology [J Cancer Res Clin Oncol] 2020 Dec; Vol. 146 (12), pp. 3241-3253. Date of Electronic Publication: 2020 Aug 31. - Publication Year :
- 2020
-
Abstract
- Purpose: Retinoids have proved to be effective for hematologic malignancies treatment but till nowadays, their use as single agent for the solid tumor's management is still controversial. All-trans retinoic acid (ATRA), the main active metabolite of vitamin A, exerts non-genomic interactions with different members of the protein kinase C (PKC) family, recognized modulators of different tumor progression pathways. To determine whether a group of patients could become benefited employing a retinoid therapy, in this study we have evaluated whether PKCα expression (a poor prognosis marker in breast cancer) could sensitizes mammary cells to ATRA treatment.<br />Methods: PKCα overexpression was achieved by stable transfection and confirmed by western blot. Transfected PKC functionality was determined by nuclear translocation-induction and confocal microscopy. In vitro proliferation was evaluated by cell counting and cell cycle distribution was analyzed by flow cytometry. In vivo studies were performed to evaluate orthotopic tumor growth and experimental lung colonization. Retinoic acid response elements (RARE) and AP1 sites-dependent activity was studied by gene reporter assays and retinoic acid receptors (RARs) were measured by RT-qPCR.<br />Results: Our findings suggest that high PKCα levels improve the differentiation response to ATRA in a RAR signaling-dependent manner. Moreover, RARβ expression appears to be critical to induce ATRA sensitization, throughout AP1 trans-repression.<br />Conclusion: Here we propose that retinoids could lead a highly personalized anticancer treatment, bringing benefits to patients with aggressive breast tumors resulting from high PKCα expression but, an adequate expression of the RARβ receptor is required to ensure the effect on this process.
- Subjects :
- Animals
Breast pathology
Breast Neoplasms genetics
Breast Neoplasms pathology
Cell Differentiation drug effects
Female
Gene Expression Regulation, Neoplastic drug effects
Heterografts
Humans
MCF-7 Cells
Mice
Retinoids pharmacology
Signal Transduction drug effects
Vitamin A genetics
Breast Neoplasms drug therapy
Protein Kinase C-alpha genetics
Receptors, Retinoic Acid genetics
Tretinoin pharmacology
Subjects
Details
- Language :
- English
- ISSN :
- 1432-1335
- Volume :
- 146
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Journal of cancer research and clinical oncology
- Publication Type :
- Academic Journal
- Accession number :
- 32865619
- Full Text :
- https://doi.org/10.1007/s00432-020-03368-7