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Bianchi L, Altera A, Barone V, Bonente D, Bacci T, De Benedetto E, Bini L, Tosi GM, Galvagni F, Bertelli E. Untangling the Extracellular Matrix of Idiopathic Epiretinal Membrane: A Path Winding among Structure, Interactomics and Translational Medicine. Cells 2022; 11:cells11162531. [PMID: 36010606 PMCID: PMC9406781 DOI: 10.3390/cells11162531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/10/2022] [Accepted: 08/12/2022] [Indexed: 12/16/2022] Open
Abstract
Idiopathic epiretinal membranes (iERMs) are fibrocellular sheets of tissue that develop at the vitreoretinal interface. The iERMs consist of cells and an extracellular matrix (ECM) formed by a complex array of structural proteins and a large number of proteins that regulate cell–matrix interaction, matrix deposition and remodelling. Many components of the ECM tend to produce a layered pattern that can influence the tractional properties of the membranes. We applied a bioinformatics approach on a list of proteins previously identified with an MS-based proteomic analysis on samples of iERM to report the interactome of some key proteins. The performed pathway analysis highlights interactions occurring among ECM molecules, their cell receptors and intra- or extracellular proteins that may play a role in matrix biology in this special context. In particular, integrin β1, cathepsin B, epidermal growth factor receptor, protein-glutamine gamma-glutamyltransferase 2 and prolow-density lipoprotein receptor-related protein 1 are key hubs in the outlined protein–protein cross-talks. A section on the biomarkers that can be found in the vitreous humor of patients affected by iERM and that can modulate matrix deposition is also presented. Finally, translational medicine in iERM treatment has been summed up taking stock of the techniques that have been proposed for pharmacologic vitreolysis.
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Affiliation(s)
- Laura Bianchi
- Department of Life Sciences, University of Siena, 53100 Siena, Italy
| | - Annalisa Altera
- Department of Life Sciences, University of Siena, 53100 Siena, Italy
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
| | - Virginia Barone
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
| | - Denise Bonente
- Department of Life Sciences, University of Siena, 53100 Siena, Italy
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
| | - Tommaso Bacci
- Department of Medicine, Surgery and Neuroscience, University of Siena, 53100 Siena, Italy
| | - Elena De Benedetto
- Department of Medicine, Surgery and Neuroscience, University of Siena, 53100 Siena, Italy
| | - Luca Bini
- Department of Life Sciences, University of Siena, 53100 Siena, Italy
| | - Gian Marco Tosi
- Department of Medicine, Surgery and Neuroscience, University of Siena, 53100 Siena, Italy
| | - Federico Galvagni
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy
| | - Eugenio Bertelli
- Department of Molecular and Developmental Medicine, University of Siena, 53100 Siena, Italy
- Correspondence:
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Milliken BT, Melegari L, Smith GL, Grohn K, Wolfe AJ, Moody K, Bou-Abdallah F, Doyle RP. Fenretinide binding to the lysosomal protein saposin D alters ceramide solubilization and hydrolysis. RSC Med Chem 2020; 11:1048-1052. [PMID: 33479697 PMCID: PMC7513591 DOI: 10.1039/d0md00182a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 06/26/2020] [Indexed: 11/13/2023] Open
Abstract
Fenretinide is a synthetic retinoid pharmaceutical linked to ceramide build-up in vivo. Saposin D is an intralysosomal protein necessary for ceramide binding/degradation. We show, via electronic absorption spectroscopy, fluorescence spectroscopy, and ceramide hydrolysis assays, that fenretinide is bound by saposin D {K a = (1.45 ± 0.49) × 105 M-1}, and affects ceramide solubilization/degradation.
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Affiliation(s)
- Brandon T Milliken
- Department of Chemistry , Syracuse University , Syracuse , NY 13244 , USA .
| | - Lindy Melegari
- Department of Chemistry , Syracuse University , Syracuse , NY 13244 , USA .
| | - Gideon L Smith
- Department of Chemistry , State University of New York , Potsdam , NY 13676 , USA .
| | - Kris Grohn
- Ichor Therapeutics, Inc , 2521 US-1 , Lafayette , NY 13084 , USA
| | - Aaron J Wolfe
- Ichor Therapeutics, Inc , 2521 US-1 , Lafayette , NY 13084 , USA
- Lysoclear Inc. , 2521 US RT 11 , Lafayette , NY 13084 , USA
| | - Kelsey Moody
- Ichor Therapeutics, Inc , 2521 US-1 , Lafayette , NY 13084 , USA
- Lysoclear Inc. , 2521 US RT 11 , Lafayette , NY 13084 , USA
| | - Fadi Bou-Abdallah
- Department of Chemistry , State University of New York , Potsdam , NY 13676 , USA .
| | - Robert P Doyle
- Department of Chemistry , Syracuse University , Syracuse , NY 13244 , USA .
- Department of Medicine , State University of New York , Upstate Medical University , 13210 , USA
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Naseri N, Sharma M, Velinov M. Autosomal dominant neuronal ceroid lipofuscinosis: Clinical features and molecular basis. Clin Genet 2020; 99:111-118. [PMID: 32783189 DOI: 10.1111/cge.13829] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/04/2020] [Accepted: 08/05/2020] [Indexed: 11/26/2022]
Abstract
The neuronal ceroid lipofuscinoses (NCLs) are at least 13 distinct progressive neurodegenerative disorders unified by the accumulation of lysosomal auto-fluorescent material called lipofuscin. The only form that occurs via autosomal-dominant inheritance exhibits adult onset and is sometimes referred to as Parry type NCL. The manifestations may include behavioral symptoms followed by seizures, ataxia, dementia, and early death. Mutations in the gene DNAJC5 that codes for the presynaptic co-chaperone cysteine string protein-α (CSPα) were recently reported in sporadic adult-onset cases and in families with dominant inheritance. The mutant CSPα protein may lead to disease progression by both loss and gain of function mechanisms. Iron chelation therapy may be considered as a possible pharmaceutical intervention based on our recent mechanism-based proposal of CSPα oligomerization via ectopic Fe-S cluster-binding, summarized in this review.
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Affiliation(s)
- Nima Naseri
- Appel Institute for Alzheimer's Disease Research, and Brain & Mind Research Institute, Weill Cornell Medicine, New York City, New York, USA
| | - Manu Sharma
- Appel Institute for Alzheimer's Disease Research, and Brain & Mind Research Institute, Weill Cornell Medicine, New York City, New York, USA
| | - Milen Velinov
- New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York, USA
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Tinklepaugh J, Smith BM, Hanlon E, Zubieta C, Bou-Abdallah F, Doyle RP. Exploring the Multiligand Binding Specificity of Saposin B Reveals Two Binding Sites. ACS OMEGA 2017; 2:7141-7145. [PMID: 29104953 PMCID: PMC5664142 DOI: 10.1021/acsomega.7b01334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 10/11/2017] [Indexed: 06/07/2023]
Abstract
Saposin B (SapB) is a human lysosomal protein, critical for the degradation of O-sulfogalactosylceramide (sulfatide). SapB binds sulfatide and presents it to the active site of the enzyme arylsulfatase A. Deficiency of SapB leads to fatal activator-deficient metachromatic leukodystrophy. Given the conformational flexibility and the large hydrophobic "pocket" produced upon (physiologically relevant) homodimerization, SapB may have broader substrate diversity than originally thought. Herein, we present evidence using fluorescence spectroscopy and computational docking studies that SapB binds a wide variety of ligands at KD values varying from micromolar to nanomolar, with entropy being the primary driving force. We further demonstrate, for the first time, that SapB has two binding sites that can sequentially (and in a preferred order) accommodate up to two ligands at once.
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Affiliation(s)
- Jay Tinklepaugh
- Department
of Chemistry, Syracuse University, 111 College Place, Syracuse, New York 13244, United States
| | - Britannia M. Smith
- Department
of Chemistry, State University of New York
at Potsdam, Potsdam, New York 13676, United
States
| | - Etta Hanlon
- Department
of Chemistry, Syracuse University, 111 College Place, Syracuse, New York 13244, United States
| | - Chloe Zubieta
- Laboratoire
de Physiologie Cellulaire & Végétale, iRTSV, UMR 5168, CNRS/CEA/INRA/Univ. Grenoble Alpes, Grenoble 38054, France
| | - Fadi Bou-Abdallah
- Department
of Chemistry, State University of New York
at Potsdam, Potsdam, New York 13676, United
States
| | - Robert P. Doyle
- Department
of Chemistry, Syracuse University, 111 College Place, Syracuse, New York 13244, United States
- Department
of Medicine, State University of New York
at Upstate Medical University, Syracuse, New York 13210, United States
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