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Published on: March 15, 2024
KLF6 enhances ferroptosis in S-AKI through the NCOA4/ACSL4/LPCAT3 axis
1Intensive Care Unit, Beijing Anzhen Nanchong Hospital of Capital Medical University & Nanchong Central Hospital, Nanchong, Sichuan, China; The Second Clinical Medical College of North Sichuan Medical College, Nanchong, Sichuan, China.
Background:
Septic acute kidney injury (S-AKI) is a major cause of acute kidney injury (AKI), but no effective therapies exist to prevent or treat it. Although KLF6 is linked to various pathophysiological processes, its exact role in S-AKI is not yet fully understood.
Methods:
The role of KLF was investigated using both the mouse CLP model and in vitro systems. To identify the transcriptional targets regulated by KLF6, ChIP-qPCR and luciferase reporter assays were carried out. Biochemical and cellular techniques were employed to assess cellular injury and lipid peroxidation levels. The extent of ferroptosis was evaluated through transmission electron microscopy (TEM).
Results:
KLF6 levels were significantly increased in a renal IRI model. Knockdown of KLF6 using AAV9 reduced kidney injury in both in vitro and in vivo models, while KLF6 overexpression aggravated injury. Overexpression of KLF6 promoted ferroptosis, whereas its knockdown reduced lipid peroxidation and ferroptosis. KLF6 regulates NCOA4 expression by binding to its promoter, controlling ferroptosis. Knockdown of NCOA4 in vitro alleviated ferroptosis and cellular damage caused by KLF6 overexpression. Pharmacological inhibition of KLF6 reduced kidney injury and ferroptosis in S-AKI mice.
Conclusion:
Our study uncovered a previously unrecognized role for KLF6 in S-AKI. By facilitating NCOA4 transcription, KLF6 intensified ferroptosis, which, in turn, aggravated septic AKI.
Insights
Transcription factor KLF6 promotes septic acute kidney injury (S-AKI) by increasing ferroptosis. Inhibiting KLF6 reduces kidney damage and ferroptosis in S-AKI models, offering a potential therapeutic target.
Area of Science:
- Nephrology
- Molecular Biology
- Cellular Pathology
Background:
- Septic acute kidney injury (S-AKI) is a significant clinical challenge with no effective treatments.
- The precise role of Krüppel-like factor 6 (KLF6) in S-AKI pathogenesis remains unclear.
Purpose of the Study:
- To elucidate the role of KLF6 in the development and progression of S-AKI.
- To investigate KLF6's regulatory mechanisms and its impact on ferroptosis in S-AKI.
Main Methods:
- Utilized mouse cecal ligation and puncture (CLP) model and in vitro systems to study KLF6.
- Employed ChIP-qPCR, luciferase assays, and biochemical methods to analyze KLF6 targets and cellular damage.
- Assessed ferroptosis using transmission electron microscopy (TEM) and lipid peroxidation markers.
Main Results:
- KLF6 expression was elevated in S-AKI models.
- KLF6 knockdown ameliorated kidney injury and reduced ferroptosis, while overexpression worsened these effects.
- KLF6 directly regulates Nuclear Receptor Coactivator 4 (NCOA4) transcription, a key mediator of ferroptosis.
Conclusions:
- KLF6 plays a critical role in exacerbating S-AKI by promoting ferroptosis.
- KLF6-induced NCOA4 transcription is a key mechanism driving ferroptosis in S-AKI.
- Targeting KLF6 presents a promising therapeutic strategy for S-AKI.
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