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The C-terminal tail of polycystin-1 suppresses cystic disease in a mitochondrial enzyme-dependent fashion

ABSTRACT: Autosomal dominant polycystic kidney disease (ADPKD) is the most prevalent potentially lethal monogenic disorder. Mutations in the PKD1 gene, which encodes polycystin-1 (PC1), account for approximately 78% of cases. PC1 is a large 462-kDa protein that undergoes cleavage in its N and C-terminal domains. C-terminal cleavage produces fragments that translocate to mitochondria. We show that transgenic expression of a protein corresponding to the final 200 amino acid (aa) residues of PC1 in two Pkd1-KO orthologous murine models of ADPKD suppresses cystic phenotype and preserves renal function. This suppression depends upon an interaction between the C-terminal tail of PC1 and the mitochondrial enzyme Nicotinamide Nucleotide Transhydrogenase (NNT). This interaction modulates tubular/cyst cell proliferation, the metabolic profile, mitochondrial function, and the redox state. Together, these results suggest that a short fragment of PC1 is sufficient to suppress cystic phenotype and open the door to the exploration of gene therapy strategies for ADPKD.

INSTRUMENT(S): Q Exactive Plus

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Kidney

DISEASE(S): Polycystic Kidney Disease

SUBMITTER: TuKiet Lam

LAB HEAD: TuKiet Lam

PROVIDER: PXD040210 | Pride | 2023-02-17

REPOSITORIES: Pride

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			Action	DRS
	OTF19-0415_Padovano_WT.raw	Raw
	OTF19-0415_Padovano_WT_F530335.mgf	Mgf
	OTF19-0415_Padovano_WT_F530335.xml	Xml
	OTF19-0419_Padovano_BAC.raw	Raw
	OTF19-0419_Padovano_BAC_F530336.mgf	Mgf

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Project description:Autosomal dominant polycystic kidney disease (ADPKD) is a common cause of ESRD. Affected individuals inherit a defective copy of either the PKD1 or PKD2 gene, encoding the proteins polycystin?1 (PC1) or polycystin?2 (PC2) respectively. PC1 and PC2 are secreted on urinary exosome?like vesicles (ELVs) (100nm diameter vesicles), where PC1 is present in a cleaved form and may be complexed with PC2. Label free quantitative proteomic studies of urine ELVs in an initial discovery cohort (13 PKD1 and 18 Normals), revealed that of 2008 ELV proteins, nine (0.32%) showed a statistically significant difference between PKD1 and normals at a p<0.025. PC1 was reduced to 54% of the normal level (p<0.02) and PC2 reduced to 53% (p<0.001). TMEM2, a protein with homology to fibrocystin, the product of the polycystic hepatic and kidney disease (PKHD1) gene, is increased 2.1 fold (p<0.025). The PC1/TMEM2 ratio correlated inversely with height adjusted total kidney volume (HtTKV) in the discovery cohort and the ratio of PC1/TMEM2 or PC2/TMEM2 could be used to distinguish PKD1 from normals in a confirmation cohort. In summary, this study suggests that a test based on the urine exosomal PC1/TMEM2 or PC2/TMEM2 ratio may have utility in the diagnosis and perhaps monitoring of PKD1.

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Project description:Autosomal dominant polycystic kidney disease (ADPKD) is caused by muta1ons in PKD1 and PKD2, encoding polycystin-1 (PC1) and polycystin-2 (PC2), which are required for the regula1on of the renal tubular diameter. Loss of polycystin func1on results in cyst forma1on. Atypical forms of ADPKD are caused by mutations in genes encoding endoplasmic reticulum (ER)-resident proteins through mechanisms that are not well understood. Here, we investigate the func1on of DNAJB11, an ER co-chaperone associated with atypical ADPKD. We generated mouse models with constitutive and conditional Dnajb11 inactivation and Dnajb11-deficient renal epithelial cells to investigate the mechanism underlying autosomal dominant inheritance, the specific cell types driving cyst formation, and molecular mechanisms underlying DNAJB11-dependent polycystic kidney disease. We show that biallelic loss of Dnajb11 causes cystic kidney disease and fibrosis, mirroring human disease characteristics. In contrast to classical ADPKD, cysts predominantly originate from proximal tubules. Cyst formation begins in utero and the timing of Dnajb11 inactivation strongly influences disease severity. Furthermore, we identify impaired PC1 cleavage as a potential mechanism underlying DNAJB11-dependent cyst formation. Proteomic analysis of Dnajb11- and Pkd1-deficient cells reveals common and distinct pathways and dysregulated proteins, providing a foundation to better understand phenotypic differences between different forms of ADPKD.

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