Synergistic effect of HIF‐1α and FoxO3a trigger cardiomyocyte apoptosis under hyperglycemic ischemia condition

• Published in: Journal of cellular physiology 2018-04, Vol.233 (4), p.3660-3671
• Main Authors: Chen, Ya‐Fang, Pandey, Sudhir, Day, Cecilia Hsuan, Chen, Yu‐Feng, Jiang, Ai‐Zhi, Ho, Tsung‐Jung, Chen, Ray‐Jade, Padma, Vijaya V., Kuo, Wei‐Wen, Huang, Chih‐Yang
• Format: Article
• Language: English
• Subjects: Animals; Apoptosis - physiology; BCL2/Adenovirus E1B Nineteen kilo Dalton Interacting Protein 3 (BNIP3); Cell Hypoxia - physiology; Cells, Cultured; diabetic hyperglycemic; forkhead box O3 (FoxO3); Forkhead Box Protein O3 - metabolism; hyperglycemia; Hyperglycemia - metabolism; Hypoxia-Inducible Factor 1, alpha Subunit - metabolism; hypoxia‐inducible factor‐1 alpha (HIF‐1α); Ischemia - metabolism; ischemia hypoxia; Membrane Proteins - metabolism; Mitochondrial Proteins - metabolism; Myocytes, Cardiac - metabolism; Rats; RNA, Small Interfering - metabolism; Signal Transduction - physiology
• ISSN: 0021-9541; 1097-4652
• DOI: 10.1002/jcp.26235

Cardiomyocyte death is an important pathogenic feature of ischemia and heart failure. Through this study, we showed the synergistic role of HIF‐1α and FoxO3a in cardiomyocyte apoptosis subjected to hypoxia plus elevated glucose levels. Using gene specific small interfering RNAs (siRNA), semi‐quantitative reverse transcriptase polymerase chain reaction (RT‐PCR), Western blot, immunofluorescence, nuclear and cytosolic localization and TUNEL assay techniques, we determined that combined function of HIF‐1α and FoxO3a under high glucose plus hypoxia condition lead to enhanced expression of BNIP3 inducing cardiomyocyte death. Our results highlighted the importance of the synergistic role of HIF‐1α and FoxO3a in cardiomyocyte death which may add insight into therapeutic approaches to pathophysiology associated with ischemic diabetic cardiomyopathies. Combined function of HIF‐1α and FoxO3a lead to cardiomyocyte death under high glucose plus hypoxia condition.