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Leppert HG, Anderson JT, Timm KJ, Davoli C, Pratt MA, Booth CD, White KA, Rechtzigel MJ, Meyerink BL, Johnson TB, Brudvig JJ, Weimer JM. Sortilin inhibition treats multiple neurodegenerative lysosomal storage disorders. bioRxiv 2023:2023.09.22.559064. [PMID: 37790379 PMCID: PMC10543011 DOI: 10.1101/2023.09.22.559064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Lysosomal storage disorders (LSDs) are a genetically and clinically diverse group of diseases characterized by lysosomal dysfunction. Batten disease is a family of severe LSDs primarily impacting the central nervous system. Here we show that AF38469, a small molecule inhibitor of sortilin, improves lysosomal and glial pathology across multiple LSD models. Live-cell imaging and comparative transcriptomics demonstrates that the transcription factor EB (TFEB), an upstream regulator of lysosomal biogenesis, is activated upon treatment with AF38469. Utilizing CLN2 and CLN3 Batten disease mouse models, we performed a short-term efficacy study and show that treatment with AF38469 prevents the accumulation of lysosomal storage material and the development of neuroinflammation, key disease associated pathologies. Tremor phenotypes, an early behavioral phenotype in the CLN2 disease model, were also completely rescued. These findings reveal sortilin inhibition as a novel and highly efficacious therapeutic modality for the treatment of multiple forms of Batten disease.
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Affiliation(s)
- Hannah G. Leppert
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
| | | | - Kaylie J. Timm
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
| | - Cristina Davoli
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
| | - Melissa A. Pratt
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
| | - Clarissa D. Booth
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
| | | | | | | | - Tyler B. Johnson
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
| | - Jon J. Brudvig
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
- Department of Pediatrics, Sanford School of Medicine, University of South Dakota, Sioux Falls, SD, USA
| | - Jill M. Weimer
- Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD
- Department of Pediatrics, Sanford School of Medicine, University of South Dakota, Sioux Falls, SD, USA
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Noubissi FK, McBride AA, Leppert HG, Millet LJ, Wang X, Davern SM. Detection and quantification of γ-H2AX using a dissociation enhanced lanthanide fluorescence immunoassay. Sci Rep 2021; 11:8945. [PMID: 33903655 PMCID: PMC8076281 DOI: 10.1038/s41598-021-88296-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/30/2021] [Indexed: 11/09/2022] Open
Abstract
Phosphorylation of the histone protein H2AX to form γ-H2AX foci directly represents DNA double-strand break formation. Traditional γ-H2AX detection involves counting individual foci within individual nuclei. The novelty of this work is the application of a time-resolved fluorescence assay using dissociation-enhanced lanthanide fluorescence immunoassay for quantitative measurements of γ-H2AX. For comparison, standard fluorescence detection was employed and analyzed either by bulk fluorescent measurements or by direct foci counting using BioTek Spot Count algorithm and Gen 5 software. Etoposide induced DNA damage in A549 carcinoma cells was compared across all test platforms. Time resolved fluorescence detection of europium as a chelated complex enabled quantitative measurement of γ-H2AX foci with nanomolar resolution. Comparative bulk fluorescent signals achieved only micromolar sensitivity. Lanthanide based immunodetection of γ-H2AX offers superior detection and a user-friendly workflow. These approaches have the potential to improve screening of compounds that either enhance DNA damage or protect against its deleterious effects.
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Affiliation(s)
| | - Amber A McBride
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Hannah G Leppert
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Larry J Millet
- Center for Environmental Biotechnology, University of Tennessee, Knoxville, TN, USA
| | - Xiaofei Wang
- Department of Biological Sciences, Tennessee State University, Nashville, TN, USA
| | - Sandra M Davern
- Radioisotope Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
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