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  2. The interplay between HIF-1α and long noncoding GAS5 regulates the JAK1/STAT3 signalling pathway in hypoxia-induced injury in myocardial cells

The interplay between HIF-1α and long noncoding GAS5 regulates the JAK1/STAT3 signalling pathway in hypoxia-induced injury in myocardial cells

  • Cardiovasc Diagn Ther. 2021 Apr;11(2):422-434. doi: 10.21037/cdt-20-773.
Yanwei Li 1 Bing Song 2 Jinlei Liu 3 Yuqiang Li 4 Jiebing Wang 5 Na Liu 6 Wei Cui 7
Affiliations

Affiliations

  • 1 Management Center of Chronic Diseases, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China.
  • 2 Department of Endocrine and Metabolic Diseases, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China.
  • 3 Department of Radiology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China.
  • 4 Biobank Department, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China.
  • 5 Department of Ultrasonography, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China.
  • 6 Endocrinology Department, Affiliated Hospital of Weifang Medical College, Weifang, China.
  • 7 Liaoning Jinzhou Inspection and Testing Certification Center, Jinzhou, China.
Abstract

Background: Long non-coding RNA (lncRNA) GAS5 is associated with hypoxia-induced diseases whereas hypoxia-inducible factor-1α (HIF-1α) plays an important role in hypoxic injury of cells. The current study explores the regulatory functions of GAS5/HIF-1α which co-play in anoxic injury among rat cardiomyocytes H9C2 cells.

Methods: Hypoxia in vitro model was established through anoxic incubation while normal culture of H9C2 cells was considered as control. The expression levels of GAS5 and HIF-1α were quantified through RT-qPCR. CCK-8 was applied to determine cell viability. Cell Apoptosis rate was calculated using flow cytometry whereas inflammatory cytokines were detected using ELISA method. The impact of downregulating GAS5 or HIF-1α or both upon hypoxic cells was assessed on the basis of changes in cell viability, Apoptosis, and inflammatory response. The activity of JAK1/STAT3 signaling was evaluated through RT-qPCR for mRNA expression. AG490 was introduced to inactivate JAK1/STAT3 pathway and to unveil the impact of JAK1/STAT3 signaling on GAS5/HIF-1α and cell viability, Apoptosis and inflammation in hypoxic cells.

Results: The results infer that hypoxia suppressed cell viability, promoted inflammation and Apoptosis among H9C2 cells. GAS5 or HIF-1α recorded higher expression in hypoxia-induced cells whereas the cell viability got restored with reduction in inflammation and Apoptosis. The downregulation of HIF-1α enhanced the protective effect of knocking down GAS5 in hypoxia H9C2 cells. JAK1/STAT3 signaling pathway got activated in hypoxic cells and was regulated by GAS5 and HIF-1α. The inhibition of signaling pathway increased the cell viability but it decreased both inflammation and Apoptosis.

Conclusions: GAS5 and HIF-1α could regulate hypoxic injury in H9C2 cells through JAK1/STAT3 signaling pathway. This scenario suggests that the inhibitors of GAS5 and HIF-1α may synergize with AG-490 to protect myocardial cells from hypoxic injury.

Keywords

JAK1/STAT3; Long non-coding RNA GAS5 (lncRNA GAS5); hypoxia; hypoxia-inducible factor-1α (HIF-1α).

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