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Guo H, Rogg M, Keller J, Scherzinger AK, Jäckel J, Meyer C, Sammarco A, Helmstädter M, Gorka O, Groß O, Schell C, Bechtel-Walz W. ADP-Ribosylation Factor-Interacting Protein 2 Acts as a Novel Regulator of Mitophagy and Autophagy in Podocytes in Diabetic Nephropathy. Antioxidants (Basel) 2024; 13:81. [PMID: 38247505 PMCID: PMC10812550 DOI: 10.3390/antiox13010081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/22/2023] [Accepted: 01/03/2024] [Indexed: 01/23/2024] Open
Abstract
(1) Background: Differentiated podocytes are particularly vulnerable to oxidative stress and cellular waste products. The disease-related loss of postmitotic podocytes is a direct indicator of renal disease progression and aging. Podocytes use highly specific regulated networks of autophagy and endocytosis that counteract the increasing number of damaged protein aggregates and help maintain cellular homeostasis. Here, we demonstrate that ARFIP2 is a regulator of autophagy and mitophagy in podocytes both in vitro and in vivo. (2) Methods: In a recent molecular regulatory network analysis of mouse glomeruli, we identified ADP-ribosylation factor-interacting protein 2 (Arfip2), a cytoskeletal regulator and cofactor of ATG9-mediated autophagosome formation, to be differentially expressed with age. We generated an Arfip2-deficient immortalized podocyte cell line using the CRISPR/Cas technique to investigate the significance of Arfip2 for renal homeostasis in vitro. For the in vivo analyses of Arfip2 deficiency, we used a mouse model of Streptozotozin-induced type I diabetes and investigated physiological data and (patho)histological (ultra)structural modifications. (3) Results: ARFIP2 deficiency in immortalized human podocytes impedes autophagy. Beyond this, ARFIP2 deficiency in human podocytes interferes with ATG9A trafficking and the PINK1-Parkin pathway, leading to the compromised fission of mitochondria and short-term increase in mitochondrial respiration and induction of mitophagy. In diabetic mice, Arfip2 deficiency deteriorates autophagy and leads to foot process effacement, histopathological changes, and early albuminuria. (4) Conclusions: In summary, we show that ARFIP2 is a novel regulator of autophagy and mitochondrial homeostasis in podocytes by facilitating ATG9A trafficking during PINK1/Parkin-regulated mitophagy.
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Affiliation(s)
- Haihua Guo
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Manuel Rogg
- Institute of Surgical Pathology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Julia Keller
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
- Faculty of Biology, University of Freiburg, 79106 Freiburg, Germany
| | - Ann-Kathrin Scherzinger
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
- Faculty of Biology, University of Freiburg, 79106 Freiburg, Germany
| | - Julia Jäckel
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Charlotte Meyer
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Alena Sammarco
- Institute of Surgical Pathology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Martin Helmstädter
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
- EMcore, Renal Division, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Oliver Gorka
- Institute of Neuropathology, Experimental Neuropathology, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Olaf Groß
- Institute of Neuropathology, Experimental Neuropathology, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
| | - Christoph Schell
- Institute of Surgical Pathology, Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
- Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, 79106 Freiburg, Germany
| | - Wibke Bechtel-Walz
- Department of Medicine IV, University Medical Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
- Berta-Ottenstein Program, Faculty of Medicine, University of Freiburg, 79106 Freiburg, Germany
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