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Original Article
Basic Research
Inhibition of Ceramide Accumulation in Podocytes by Myriocin Prevents Diabetic Nephropathy
Chang-Yun Woo, Ji Yeon Baek, Ah-Ram Kim, Chung Hwan Hong, Ji Eun Yoon, Hyoun Sik Kim, Hyun Ju Yoo, Tae-Sik Park, Ranjan Kc, Ki-Up Lee, Eun Hee Koh
Diabetes Metab J. 2020;44(4):581-591.   Published online November 4, 2019
DOI: https://doi.org/10.4093/dmj.2019.0063
  • 6,188 View
  • 165 Download
  • 27 Web of Science
  • 29 Crossref
AbstractAbstract PDFPubReader   ePub   
Background

Ceramides are associated with metabolic complications including diabetic nephropathy in patients with diabetes. Recent studies have reported that podocytes play a pivotal role in the progression of diabetic nephropathy. Also, mitochondrial dysfunction is known to be an early event in podocyte injury. Thus, we tested the hypothesis that ceramide accumulation in podocytes induces mitochondrial damage through reactive oxygen species (ROS) production in patients with diabetic nephropathy.

Methods

We used Otsuka Long Evans Tokushima Fatty (OLETF) rats and high-fat diet (HFD)-fed mice. We fed the animals either a control- or a myriocin-containing diet to evaluate the effects of the ceramide. Also, we assessed the effects of ceramide on intracellular ROS generation and on podocyte autophagy in cultured podocytes.

Results

OLETF rats and HFD-fed mice showed albuminuria, histologic features of diabetic nephropathy, and podocyte injury, whereas myriocin treatment effectively treated these abnormalities. Cultured podocytes exposed to agents predicted to be risk factors (high glucose, high free fatty acid, and angiotensin II in combination [GFA]) showed an increase in ceramide accumulation and ROS generation in podocyte mitochondria. Pretreatment with myriocin reversed GFA-induced mitochondrial ROS generation and prevented cell death. Myriocin-pretreated cells were protected from GFA-induced disruption of mitochondrial integrity.

Conclusion

We showed that mitochondrial ceramide accumulation may result in podocyte damage through ROS production. Therefore, this signaling pathway could become a pharmacological target to abate the development of diabetic kidney disease.

Citations

Citations to this article as recorded by  
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Reviews
Complications
Autophagy: A Novel Therapeutic Target for Diabetic Nephropathy
Shinji Kume, Daisuke Koya
Diabetes Metab J. 2015;39(6):451-460.   Published online December 11, 2015
DOI: https://doi.org/10.4093/dmj.2015.39.6.451
  • 4,830 View
  • 54 Download
  • 80 Web of Science
  • 73 Crossref
AbstractAbstract PDFPubReader   

Diabetic nephropathy is a leading cause of end stage renal disease and its occurance is increasing worldwide. The most effective treatment strategy for the condition is intensive treatment to strictly control glycemia and blood pressure using renin-angiotensin system inhibitors. However, a fraction of patients still go on to reach end stage renal disease even under such intensive care. New therapeutic targets for diabetic nephropathy are, therefore, urgently needed. Autophagy is a major catabolic pathway by which mammalian cells degrade macromolecules and organelles to maintain intracellular homeostasis. The accumulation of damaged proteins and organelles is associated with the pathogenesis of diabetic nephropathy. Autophagy in the kidney is activated under some stress conditions, such as oxidative stress and hypoxia in proximal tubular cells, and occurs even under normal conditions in podocytes. These and other accumulating findings have led to a hypothesis that autophagy is involved in the pathogenesis of diabetic nephropathy. Here, we review recent findings underpinning this hypothesis and discuss the advantages of targeting autophagy for the treatment of diabetic nephropathy.

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The Role of Glomerular Podocytes in Diabetic Nephropathy.
Eun Young Lee, Choon Hee Chung
Korean Diabetes J. 2007;31(6):451-454.   Published online November 1, 2007
DOI: https://doi.org/10.4093/jkda.2007.31.6.451
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AbstractAbstract PDF
Diabetic nephropathy is the most common cause of end-stage renal disease and accounts for significant morbidity and mortality among individuals with diabetes mellitus. Therefore, the clarification of the pathogenesis of diabetic nephropathy is an urgent issue. Podocytes cover the outer layer of the glomerulus and maintain its integrity so that fluid and toxins exit in urine, but cells and important proteins are kept in the blood stream. Diabetes mellitus alters this structure, it becomes scarred and then the ability of the kidney to clear toxins is lost. Recent evidence shows that early in diabetes the podocyte number is reduced, areas of the glomerular basement membrane are denuded, and podocyte number predicts long-term urinary albumin excretion in the patients with diabetes and microalbuminuria. These results suggest that podocytes play a critical role in the early stage of diabetic nephropathy. It is the purpose of this article to review the pathogenetic role of podocytes in diabetic nephropathy.

Citations

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