Estrogen and/or Estrogen Receptor α Inhibits BNIP3-Induced Apoptosis and Autophagy in H9c2 Cardiomyoblast Cells
| Autor: | Yi Jiun Weng, Marthandam Asokan Shibu, Chia Yao Shen, Bih Cheng Chen, Hsin-Yueh Liang, Yueh-Sheng Chen, Yueh Min Lin, Vijaya Padma Viswanadha, Chien Kuo Han, Chih Yang Huang |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Programmed cell death autophagy BNIP3 ATG5 Estrogen receptor Caspase 3 Catalysis Article Cell Line lcsh:Chemistry Inorganic Chemistry Mitochondrial Proteins 03 medical and health sciences Animals Physical and Theoretical Chemistry lcsh:QH301-705.5 Molecular Biology Spectroscopy estrogen receptor alpha apoptosis biology Chemistry Organic Chemistry Autophagy Estrogen Receptor alpha Membrane Proteins Estrogens General Medicine Computer Science Applications Cell biology Rats 030104 developmental biology lcsh:Biology (General) lcsh:QD1-999 Apoptosis biology.protein Estrogen receptor alpha Myoblasts Cardiac RHEB |
| Zdroj: | International Journal of Molecular Sciences; Volume 19; Issue 5; Pages: 1298 International Journal of Molecular Sciences International Journal of Molecular Sciences, Vol 19, Iss 5, p 1298 (2018) |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms19051298 |
| Popis: | The process of autophagy in heart cells maintains homeostasis during cellular stress such as hypoxia by removing aggregated proteins and damaged organelles and thereby protects the heart during the times of starvation and ischemia. However, autophagy can lead to substantial cell death under certain circumstances. BCL2/adenovirus E1B 19 kDa protein-interacting protein 3 (BNIP3), a hypoxia-induced marker, has been shown to induce both autophagy and apoptosis. A BNIP3-docked organelle, e.g., mitochondria, also determines whether autophagy or apoptosis will take place. Estrogen (E2) and estrogen receptor (ER) alpha (ERα) have been shown to protect the heart against mitochondria-dependent apoptosis. The aim of the present study is to investigate the mechanisms by which ERα regulates BNIP3-induced apoptosis and autophagy, which is associated with hypoxic injury, in cardiomyoblast cells. An in vitro model to mimic hypoxic injury in the heart by engineering H9c2 cardiomyoblast cells to overexpress BNIP3 was established. Further, the effects of E2 and ERα in BNIP3-induced apoptosis and autophagy were determined in BNIP3 expressing H9c2 cells. Results from TUNEL assay and Immunoflourecense assay for LC3 puncta formation, respectively, revealed that ERα/E2 suppresses BNIP3-induced apoptosis and autophagy. The Western blot analysis showed ERα/E2 decreases the protein levels of caspase 3 (apoptotic marker), Atg5, and LC3-II (autophagic markers). Co-immunoprecipitation of BNIP3 and immunoblotting of Bcl-2 and Rheb showed that ERα reduced the interaction between BNIP3 and Bcl-2 or Rheb. The results confirm that ERα binds to BNIP3 causing a reduction in the levels of functional BNIP3 and thereby inhibits cellular apoptosis and autophagy. In addition, ERα attenuated the activity of the BNIP3 promoter by binding to SP-1 or NFκB sites. |
| Databáze: | OpenAIRE |
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