Diabetes & Metabolism Journal

Original Article

Basic research
Reducing Oxidative Stress and Inflammation by Pyruvate Dehydrogenase Kinase 4 Inhibition Is Important in Prevention of Renal Ischemia-Reperfusion Injury in Diabetic Mice: Ah Reum Khang, Dong Hun Kim, Min-Ji Kim, Chang Joo Oh, Jae-Han Jeon, Sung Hee Choi, In-Kyu Lee; Diabetes Metab J. 2024;48(3):405-417. Published online February 1, 2024; DOI: https://doi.org/10.4093/dmj.2023.0196

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Background
Reactive oxygen species (ROS) and inflammation are reported to have a fundamental role in the pathogenesis of ischemia-reperfusion (IR) injury, a leading cause of acute kidney injury. The present study investigated the role of pyruvate dehydrogenase kinase 4 (PDK4) in ROS production and inflammation following IR injury.
Methods
We used a streptozotocin-induced diabetic C57BL6/J mouse model, which was subjected to IR by clamping both renal pedicles. Cellular apoptosis and inflammatory markers were evaluated in NRK-52E cells and mouse primary tubular cells after hypoxia and reoxygenation using a hypoxia work station.
Results
Following IR injury in diabetic mice, the expression of PDK4, rather than the other PDK isoforms, was induced with a marked increase in pyruvate dehydrogenase E1α (PDHE1α) phosphorylation. This was accompanied by a pronounced ROS activation, as well as tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), interleukin-1β (IL-1β), and monocyte chemoattractant protein-1 (MCP-1) production. Notably, sodium dichloroacetate (DCA) attenuated renal IR injury-induced apoptosis which can be attributed to reducing PDK4 expression and PDHE1α phosphorylation levels. DCA or shPdk4 treatment reduced oxidative stress and decreased TNF-α, IL-6, IL-1β, and MCP-1 production after IR or hypoxia-reoxygenation injury.
Conclusion
PDK4 inhibition alleviated renal injury with decreased ROS production and inflammation, supporting a critical role for PDK4 in IR mediated damage. This result indicates another potential target for reno-protection during IR injury; accordingly, the role of PDK4 inhibition needs to be comprehensively elucidated in terms of mitochondrial function during renal IR injury.

Citations

Citations to this article as recorded by

Exploring Renal Pyruvate Metabolism as a Therapeutic Avenue for Diabetic Kidney Injury
Jaemin Lee
Diabetes & Metabolism Journal.2024; 48(3): 385. CrossRef
Cardiovascular Disease and miRNAs: Possible Oxidative Stress-Regulating Roles of miRNAs
Seahyoung Lee
Antioxidants.2024; 13(6): 656. CrossRef
Sodium Phenylbutyrate Attenuates Cisplatin-Induced Acute Kidney Injury Through Inhibition of Pyruvate Dehydrogenase Kinase 4
Chang Joo Oh, Wooyoung Choi, Ha Young Lee, In-Kyu Lee, Min-Ji Kim, Jae-Han Jeon
Biomedicines.2024; 12(12): 2815. CrossRef

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