A missense mutant of ocrl1 promotes apoptosis of tubular epithelial cells and disrupts endocytosis and the cell cycle of podocytes in Dent-2 Disease.

Autor: Huang L; Department of Nephrology, Children's Hospital, Zhejiang University School of Medicine. National Clinical Research Center for Child Health, Hangzhou, China., Zhang Y; Department of Pediatrics, Clinical Center of Pediatric Nephrology of Henan Province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China., Fu H; Department of Nephrology, Children's Hospital, Zhejiang University School of Medicine. National Clinical Research Center for Child Health, Hangzhou, China., Gu W; Department of Pathologyology, Children's Hospital, Zhejiang University School of Medicine. National Clinical Research Center for Child Health, Hangzhou, China., Mao J; Department of Nephrology, Children's Hospital, Zhejiang University School of Medicine. National Clinical Research Center for Child Health, Hangzhou, China. maojh88@zju.edu.cn.
Jazyk: angličtina
Zdroj: Cell communication and signaling : CCS [Cell Commun Signal] 2023 Dec 05; Vol. 21 (1), pp. 256. Date of Electronic Publication: 2023 Dec 05.
DOI: 10.1186/s12964-023-01272-4
Abstrakt: Background: This study aimed to identify an orcl1 mutation in a patient with Dent-2 Disease and investigate the underlying mechanisms.
Methods: The ocrl1 mutation was identified through exome sequencing. Knockdown of orcl1 and overexpression of the orcl1 mutant were performed in HK-2 and MPC5 cells to study its function, while flow cytometry measured reactive oxygen species (ROS), phosphatidylserine levels, and cell apoptosis. Scanning electron microscopy observed crystal adhesion, while transmission electron microscopy examined kidney tissue pathology. Laser scanning confocal microscopy was used to examine endocytosis, and immunohistochemical and immunofluorescence assays detected protein expression. Additionally, podocyte-specific orcl1 knockout mice were generated to investigate the role of orcl1 in vivo.
Results: We identified a mutation resulting in the replacement of Histidine with Arginine at position 318 (R318H) in ocrl1 in the proband. orcl1 was widely expressed in the kidney. In vitro experiments showed that knockdown of orcl1 and overexpression of ocrl1 mutant increased ROS, phosphatidylserine exocytosis, crystal adhesion, and cell apoptosis in HK-2 cells. Knockdown of orcl1 in podocytes reduced endocytosis and disrupted the cell cycle while increasing cell migration. In vivo studies in mice showed that conditional deletion of orcl1 in podocytes caused glomerular dysfunction, including proteinuria and fibrosis.
Conclusion: This study identified an R318H mutation in orcl1 in a patient with Dent-2 Disease. This mutation may contribute to renal injury by promoting ROS production and inducing cell apoptosis in tubular cells, while disrupting endocytosis and the cell cycle, and promoting cell migration of podocytes. Video Abstract.
(© 2023. The Author(s).)
Databáze: MEDLINE
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