Title | In Vitro Investigations of miR-33a Expression in Estrogen Receptor-Targeting Therapies in Breast Cancer Cells |
---|
Type | Journal article |
---|
Authors | Ozfiliz Kilbas, P., Ozlem Sonmez, Pinar Obakan-Yerlikaya, Ajda Coker-Gurkan, Narcin Palavan-Ünsal, Uysal Onganer, P. and Arisan, E. |
---|
Abstract | Background: Increased fatty acid synthesis leads to the aggressive phenotype of breast cancer and renders efficiency of therapeutics. Regulatory microRNAs (miRNAs) on lipid biosynthesis pathways as miR-33a have potential to clarify the exact mechanism. (2) Methods: We determined miR-33a expression levels following exposure of MCF-7 and MDA-MB-231 breast cancer cells to estrogen receptor (ER) activator (estradiol-17β, E2) or anti-estrogens (ICI 182,780, Fulvestrant, FUL) at non-cytotoxic concentrations. We related miR-33a expression levels in the cells to cellular lipid biosynthesis-related pathways through immunoblotting. (3) Results: miR-33a mimic treatment led to significantly downregulation of fatty acid synthase (FASN) in MCF-7 cells but not in MDA-MB-231 cells in the presence of estradiol-17β (E2) or Fulvestrant (FUL). In contrast to the miR-33a inhibitor effect, miR-33a mimic co-transfection with E2 or FUL led to diminished AMP-activated protein kinase α (AMPKα) activity in MCF-7 cells. E2 increases FASN levels in MDA-MB-231 cells regardless of miR-33a cellular levels. miR-33a inhibitor co-treatment suppressed E2-mediated AMPKα activity in MDA-MB-231 cells. (4) Conclusions: The cellular expression levels of miR-33a are critical to understanding differential responses which include cellular energy sensors such as AMPKα activation status in breast cancer cells. |
---|
Keywords | estrogen |
---|
| breast cancer |
---|
| miR-33a |
---|
| adipogenesis |
---|
| FASN |
---|
| fulvestrant |
---|
Journal | Cancers |
---|
Journal citation | 13 (21), p. e5322 |
---|
ISSN | 2072-6694 |
---|
Year | 2021 |
---|
Publisher | MDPI |
---|
Publisher's version | License CC BY 4.0 File Access Level Open (open metadata and files) |
---|
Digital Object Identifier (DOI) | https://doi.org/10.3390/cancers13215322 |
---|
Web address (URL) | https://www.mdpi.com/2072-6694/13/21/5322 |
---|
Publication dates |
---|
Published | Oct 2021 |
---|
Supplemental file | File Access Level Open (open metadata and files) |
---|
License | CC BY 4.0 |
---|