ResearchIn-Press PreviewNephrology Open Access | 10.1172/jci.insight.182534
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Hasegawa, S. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Nangaku, M. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Takenaka, Y. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Kitayama, C. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Li, Q. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
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1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Hong, Y. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
Find articles by Shang, J. in: JCI | PubMed | Google Scholar
1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
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1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
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1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
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1Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Japan
2Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Tokyo, Japan
3Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, Korea, Republic of
4Division of Chronic Kidney Disease Pathophysiology, The University of Tokyo School of Medicine, Tokyo, China
5Department of Chemistry and Biotechnology, The University of Tokyo School of Engineering, Tokyo, Japan
6Department of Diabetes and Metabolic Diseases, The University of Tokyo School of Medicine, Tokyo, Japan
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Published August 8, 2024 - More info
Organelle stress exacerbates podocyte injury, contributing to perturbed lipid metabolism. Simultaneous organelle stresses occur in kidney tissues; therefore, a thorough analysis of organelle communication is crucial for understanding the progression of kidney diseases. Although organelles closely interact with one another at membrane contact sites, limited studies have explored their involvement in kidney homeostasis. The endoplasmic reticulum (ER) protein, PDZ domain-containing 8 (PDZD8), is implicated in multiple organelle tethering processes and cellular lipid homeostasis. In this study, we aimed to elucidate the role of organelle communication in podocyte injury using podocyte-specific Pdzd8-knockout mice. Our findings demonstrated that Pdzd8 deletion exacerbated podocyte injury in an accelerated obesity-related kidney disease model. Proteomic analysis of isolated glomeruli revealed that Pdzd8 deletion exacerbated mitochondrial and endosomal dysfunction during podocyte lipotoxicity. Additionally, electron microscopy revealed the accumulation of “fatty abnormal endosomes” in Pdzd8-deficient podocytes during obesity-related kidney diseases. Lipidomic analysis indicated that glucosylceramide accumulated in Pdzd8-deficient podocytes, owing to accelerated production and decelerated degradation. Thus, the organelle-tethering factor, PDZD8, plays a crucial role in maintaining mitochondrial and endosomal homeostasis during podocyte lipotoxicity. Collectively, our findings highlight the importance of organelle communication at the three-way junction among the ER, mitochondria, and endosomes in preserving podocyte homeostasis.