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Maurer J, Grouzmann E, Eugster PJ. Tutorial review for peptide assays: An ounce of pre-analytics is worth a pound of cure. J Chromatogr B Analyt Technol Biomed Life Sci 2023; 1229:123904. [PMID: 37832388 DOI: 10.1016/j.jchromb.2023.123904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/04/2023] [Accepted: 10/05/2023] [Indexed: 10/15/2023]
Abstract
The recent increase in peptidomimetic-based medications and the growing interest in peptide hormones has brought new attention to the quantification of peptides for diagnostic purposes. Indeed, the circulating concentrations of peptide hormones in the blood provide a snapshot of the state of the body and could eventually lead to detecting a particular health condition. Although extremely useful, the quantification of such molecules, preferably by liquid chromatography coupled to mass spectrometry, might be quite tricky. First, peptides are subjected to hydrolysis, oxidation, and other post-translational modifications, and, most importantly, they are substrates of specific and nonspecific proteases in biological matrixes. All these events might continue after sampling, changing the peptide hormone concentrations. Second, because they include positively and negatively charged groups and hydrophilic and hydrophobic residues, they interact with their environment; these interactions might lead to a local change in the measured concentrations. A phenomenon such as nonspecific adsorption to lab glassware or materials has often a tremendous effect on the concentration and needs to be controlled with particular care. Finally, the circulating levels of peptides might be low (pico- or femtomolar range), increasing the impact of the aforementioned effects and inducing the need for highly sensitive instruments and well-optimized methods. Thus, despite the extreme diversity of these peptides and their matrixes, there is a common challenge for all the assays: the need to keep concentrations unchanged from sampling to analysis. While significant efforts are often placed on optimizing the analysis, few studies consider in depth the impact of pre-analytical steps on the results. By working through practical examples, this solution-oriented tutorial review addresses typical pre-analytical challenges encountered during the development of a peptide assay from the standpoint of a clinical laboratory. We provide tips and tricks to avoid pitfalls as well as strategies to guide all new developments. Our ultimate goal is to increase pre-analytical awareness to ensure that newly developed peptide assays produce robust and accurate results.
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Affiliation(s)
- Jonathan Maurer
- Service of Clinical Pharmacology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Eric Grouzmann
- Service of Clinical Pharmacology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Philippe J Eugster
- Service of Clinical Pharmacology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland.
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2
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Gorelik A, Illes K, Mazhab-Jafari MT, Nagar B. Structure of the immunoregulatory sialidase NEU1. SCIENCE ADVANCES 2023; 9:eadf8169. [PMID: 37205763 DOI: 10.1126/sciadv.adf8169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 04/14/2023] [Indexed: 05/21/2023]
Abstract
Sialic acids linked to glycoproteins and glycolipids are important mediators of cell and protein recognition events. These sugar residues are removed by neuraminidases (sialidases). Neuraminidase-1 (sialidase-1 or NEU1) is a ubiquitously expressed mammalian sialidase located in lysosomes and on the cell membrane. Because of its modulation of multiple signaling processes, it is a potential therapeutic target for cancers and immune disorders. Genetic defects in NEU1 or in its protective protein cathepsin A (PPCA, CTSA) cause the lysosomal storage diseases sialidosis and galactosialidosis. To further our understanding of this enzyme's function at the molecular level, we determined the three-dimensional structure of murine NEU1. The enzyme oligomerizes through two self-association interfaces and displays a wide substrate-binding cavity. A catalytic loop adopts an inactive conformation. We propose a mechanism of activation involving a conformational change in this loop upon binding to its protective protein. These findings may facilitate the development of selective inhibitor and agonist therapies.
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Affiliation(s)
- Alexei Gorelik
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
| | - Katalin Illes
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
| | - Mohammad T Mazhab-Jafari
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
- Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada
| | - Bhushan Nagar
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
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3
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Madero-Ayala PA, Mares-Alejandre RE, Ramos-Ibarra MA. In Silico Structural Analysis of Serine Carboxypeptidase Nf314, a Potential Drug Target in Naegleria fowleri Infections. Int J Mol Sci 2022; 23:ijms232012203. [PMID: 36293059 PMCID: PMC9603766 DOI: 10.3390/ijms232012203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 09/28/2022] [Accepted: 10/12/2022] [Indexed: 11/24/2022] Open
Abstract
Naegleria fowleri, also known as the “brain-eating” amoeba, is a free-living protozoan that resides in freshwater bodies. This pathogenic amoeba infects humans as a casual event when swimming in contaminated water. Upon inhalation, N. fowleri invades the central nervous system and causes primary amoebic meningoencephalitis (PAM), a rapidly progressive and often fatal disease. Although PAM is considered rare, reducing its case fatality rate compels the search for pathogen-specific proteins with a structure–function relationship that favors their application as targets for discovering new or improved drugs against N. fowleri infections. Herein, we report a computational approach to study the structural features of Nf314 (a serine carboxypeptidase that is a virulence-related protein in N. fowleri infections) and assess its potential as a drug target, using bioinformatics tools and in silico molecular docking experiments. Our findings suggest that Nf314 has a ligand binding site suitable for the structure-based design of specific inhibitors. This study represents a further step toward postulating a reliable therapeutic target to treat PAM with drugs specifically aimed at blocking the pathogen proliferation by inhibiting protein function.
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Ibáñez A, Skupien-Rabian B, Jankowska U, Kędracka-Krok S, Zając B, Pabijan M. Functional Protein Composition in Femoral Glands of Sand Lizards ( Lacerta agilis). MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27072371. [PMID: 35408771 PMCID: PMC9000839 DOI: 10.3390/molecules27072371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/29/2022] [Accepted: 03/31/2022] [Indexed: 11/16/2022]
Abstract
Proteins are ubiquitous macromolecules that display a vast repertoire of chemical and enzymatic functions, making them suitable candidates for chemosignals, used in intraspecific communication. Proteins are present in the skin gland secretions of vertebrates but their identity, and especially, their functions, remain largely unknown. Many lizard species possess femoral glands, i.e., epidermal organs primarily involved in the production and secretion of chemosignals, playing a pivotal role in mate choice and intrasexual communication. The lipophilic fraction of femoral glands has been well studied in lizards. In contrast, proteins have been the focus of only a handful of investigations. Here, we identify and describe inter-individual expression patterns and the functionality of proteins present in femoral glands of male sand lizards (Lacerta agilis) by applying mass spectrometry-based proteomics. Our results show that the total number of proteins varied substantially among individuals. None of the identified femoral gland proteins could be directly linked to chemical communication in lizards, although this result hinges on protein annotation in databases in which squamate semiochemicals are poorly represented. In contrast to our expectations, the proteins consistently expressed across individuals were related to the immune system, antioxidant activity and lipid metabolism as their main functions, showing that proteins in reptilian epidermal glands may have other functions besides chemical communication. Interestingly, we found expression of the Major Histocompatibility Complex (MHC) among the multiple and diverse biological processes enriched in FGs, tentatively supporting a previous hypothesis that MHC was coopted for semiochemical function in sand lizards, specifically in mate recognition. Our study shows that mass spectrometry-based proteomics are a powerful tool for characterizing and deciphering the role of proteins secreted by skin glands in non-model vertebrates.
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Affiliation(s)
- Alejandro Ibáñez
- Department of Comparative Anatomy, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, 30-387 Kraków, Poland;
- Department of Ecology and Vertebrate Zoology, Faculty of Biology and Environmental Protection, University of Łódź, 90-237 Łódź, Poland
- Correspondence:
| | - Bozena Skupien-Rabian
- Proteomics and Mass Spectrometry Core Facility, Malopolska Centre of Biotechnology, Jagiellonian University, 30-387 Kraków, Poland; (B.S.-R.); (U.J.)
| | - Urszula Jankowska
- Proteomics and Mass Spectrometry Core Facility, Malopolska Centre of Biotechnology, Jagiellonian University, 30-387 Kraków, Poland; (B.S.-R.); (U.J.)
| | - Sylwia Kędracka-Krok
- Department of Physical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387 Kraków, Poland;
| | - Bartłomiej Zając
- Institute of Environmental Sciences, Faculty of Biology, Jagiellonian University, 30-387 Kraków, Poland;
| | - Maciej Pabijan
- Department of Comparative Anatomy, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, 30-387 Kraków, Poland;
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5
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Ito S, Hirota T, Yanai M, Muto M, Watanabe E, Taya Y, Ieiri I. Effects of Genetic Polymorphisms of Cathepsin A on Metabolism of Tenofovir Alafenamide. Genes (Basel) 2021; 12:genes12122026. [PMID: 34946974 PMCID: PMC8700939 DOI: 10.3390/genes12122026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 12/19/2021] [Indexed: 11/16/2022] Open
Abstract
Cathepsin A (CatA) is important as a drug-metabolizing enzyme responsible for the activation of prodrugs, such as the anti-human immunodeficiency virus drug Tenofovir Alafenamide (TAF). The present study was undertaken to clarify the presence of polymorphisms of the CatA gene in healthy Japanese subjects and the influence of gene polymorphism on the expression level of CatA protein and the drug-metabolizing activity. Single-strand conformation polymorphism method was used to analyze genetic polymorphisms in healthy Japanese subjects. Nine genetic polymorphisms were identified in the CatA gene. The polymorphism (85_87CTG>-) in exon 2 was a mutation causing a deletion of leucine, resulting in the change of the leucine 9-repeat (Leu9) to 8-repeat (Leu8) in the signal peptide region of CatA protein. The effect of Leu8 on the expression level of CatA protein was evaluated in Flp-In-293 cells with a stably expressed CatA, resulting in the expression of CatA protein being significantly elevated in variant 2 with Leu8 compared with Leu9. Higher concentrations of tenofovir alanine (TFV-Ala), a metabolite of TAF, were observed in the Leu8-expressing cells than in the Leu9-expressing cells using LC/MS/MS. Our findings suggest that the drug metabolic activity of CatA is altered by the genetic polymorphism.
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Affiliation(s)
- Soichiro Ito
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan; (S.I.); (M.Y.); (M.M.); (E.W.)
- Drug Metabolism and Pharmacokinetics Research Laboratories, Central Pharmaceutical Research Institute, Japan Tobacco Inc., Osaka 569-1125, Japan;
| | - Takeshi Hirota
- Pharmacy, Kyushu University Hospital, Fukuoka 812-8582, Japan;
| | - Miyu Yanai
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan; (S.I.); (M.Y.); (M.M.); (E.W.)
| | - Mai Muto
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan; (S.I.); (M.Y.); (M.M.); (E.W.)
| | - Eri Watanabe
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan; (S.I.); (M.Y.); (M.M.); (E.W.)
| | - Yuki Taya
- Drug Metabolism and Pharmacokinetics Research Laboratories, Central Pharmaceutical Research Institute, Japan Tobacco Inc., Osaka 569-1125, Japan;
| | - Ichiro Ieiri
- Pharmacy, Kyushu University Hospital, Fukuoka 812-8582, Japan;
- Correspondence:
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Gorelik A, Illes K, Hasan SMN, Nagar B, Mazhab-Jafari MT. Structure of the murine lysosomal multienzyme complex core. SCIENCE ADVANCES 2021; 7:7/20/eabf4155. [PMID: 33980489 PMCID: PMC8115914 DOI: 10.1126/sciadv.abf4155] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 03/23/2021] [Indexed: 05/04/2023]
Abstract
The enzymes β-galactosidase (GLB1) and neuraminidase 1 (NEU1; sialidase 1) participate in the degradation of glycoproteins and glycolipids in the lysosome. To remain active and stable, they associate with PPCA [protective protein cathepsin A (CTSA)] into a high-molecular weight lysosomal multienzyme complex (LMC), of which several forms exist. Genetic defects in these three proteins cause the lysosomal storage diseases GM1-gangliosidosis/mucopolysaccharidosis IV type B, sialidosis, and galactosialidosis, respectively. To better understand the interactions between these enzymes, we determined the three-dimensional structure of the murine LMC core. This 0.8-MDa complex is composed of three GLB1 dimers and three CTSA dimers, adopting a triangular architecture maintained through six copies of a unique GLB1-CTSA polar interface. Mutations in this contact surface that occur in GM1-gangliosidosis prevent formation of the LMC in vitro. These findings may facilitate development of therapies for lysosomal storage disorders.
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Affiliation(s)
- Alexei Gorelik
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Katalin Illes
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
| | - S M Naimul Hasan
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Bhushan Nagar
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
| | - Mohammad T Mazhab-Jafari
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
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Cadaoas J, Hu H, Boyle G, Gomero E, Mosca R, Jayashankar K, Machado M, Cullen S, Guzman B, van de Vlekkert D, Annunziata I, Vellard M, Kakkis E, Koppaka V, d’Azzo A. Galactosialidosis: preclinical enzyme replacement therapy in a mouse model of the disease, a proof of concept. Mol Ther Methods Clin Dev 2021; 20:191-203. [PMID: 33426146 PMCID: PMC7782203 DOI: 10.1016/j.omtm.2020.11.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 11/17/2020] [Indexed: 12/11/2022]
Abstract
Galactosialidosis is a rare lysosomal storage disease caused by a congenital defect of protective protein/cathepsin A (PPCA) and secondary deficiency of neuraminidase-1 and β-galactosidase. PPCA is a lysosomal serine carboxypeptidase that functions as a chaperone for neuraminidase-1 and β-galactosidase within a lysosomal multi-protein complex. Combined deficiency of the three enzymes leads to accumulation of sialylated glycoproteins and oligosaccharides in tissues and body fluids and manifests in a systemic disease pathology with severity mostly correlating with the type of mutation(s) and age of onset of the symptoms. Here, we describe a proof-of-concept, preclinical study toward the development of enzyme replacement therapy for galactosialidosis, using a recombinant human PPCA. We show that the recombinant enzyme, taken up by patient-derived fibroblasts, restored cathepsin A, neuraminidase-1, and β-galactosidase activities. Long-term, bi-weekly injection of the recombinant enzyme in a cohort of mice with null mutation at the PPCA (CTSA) locus (PPCA -/- ), a faithful model of the disease, demonstrated a dose-dependent, systemic internalization of the enzyme by cells of various organs, including the brain. This resulted in restoration/normalization of the three enzyme activities, resolution of histopathology, and reduction of sialyloligosacchariduria. These positive results underscore the benefits of a PPCA-mediated enzyme replacement therapy for the treatment of galactosialidosis.
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Affiliation(s)
| | - Huimin Hu
- Department of Genetics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | | | - Elida Gomero
- Department of Genetics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Rosario Mosca
- Department of Genetics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | | | - Mike Machado
- Ultragenyx Pharmaceutical, Novato, CA 94949, USA
| | - Sean Cullen
- Ultragenyx Pharmaceutical, Novato, CA 94949, USA
| | - Belle Guzman
- Ultragenyx Pharmaceutical, Novato, CA 94949, USA
| | - Diantha van de Vlekkert
- Department of Genetics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Ida Annunziata
- Department of Genetics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | | | - Emil Kakkis
- Ultragenyx Pharmaceutical, Novato, CA 94949, USA
| | - Vish Koppaka
- Ultragenyx Pharmaceutical, Novato, CA 94949, USA
| | - Alessandra d’Azzo
- Department of Genetics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
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Dellafiora L, Gonaus C, Streit B, Galaverna G, Moll WD, Vogtentanz G, Schatzmayr G, Dall’Asta C, Prasad S. An In Silico Target Fishing Approach to Identify Novel Ochratoxin A Hydrolyzing Enzyme. Toxins (Basel) 2020; 12:E258. [PMID: 32316122 PMCID: PMC7232302 DOI: 10.3390/toxins12040258] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/06/2020] [Accepted: 04/13/2020] [Indexed: 12/29/2022] Open
Abstract
Ochratoxin A (OTA), a mycotoxin that is of utmost concern in food and feed safety, is produced by fungal species that mainly belong to the Aspergillus and Penicillium genera. The development of mitigation strategies to reduce OTA content along the supply chains is key to ensuring safer production of food and feed. Enzyme-based strategies are among the most promising methods due to their specificity, efficacy, and multi-situ applicability. In particular, some enzymes are already known for hydrolyzing OTA into ochratoxin alpha (OTα) and phenylalanine (Phe), eventually resulting in detoxification action. Therefore, the discovery of novel OTA hydrolyzing enzymes, along with the advancement of an innovative approach for their identification, could provide a broader basis to develop more effective mitigating strategies in the future. In the present study, a hybrid in silico/in vitro workflow coupling virtual screening with enzymatic assays was applied in order to identify novel OTA hydrolyzing enzymes. Among the various hits, porcine carboxypeptidase B was identified for the first time as an effective OTA hydrolyzing enzyme. The successful experimental endorsement of findings of the workflow confirms that the presented strategy is suitable for identifying novel OTA hydrolyzing enzymes, and it might be relevant for the discovery of other mycotoxin- mitigating enzymes.
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Affiliation(s)
- Luca Dellafiora
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy; (G.G.); (C.D.)
| | - Christoph Gonaus
- BIOMIN Research Centre, Technopark 1, 3430 Tulln an der Donau, Austria; (C.G.); (B.S.); (W.-D.M.); (G.V.); (G.S.)
| | - Barbara Streit
- BIOMIN Research Centre, Technopark 1, 3430 Tulln an der Donau, Austria; (C.G.); (B.S.); (W.-D.M.); (G.V.); (G.S.)
| | - Gianni Galaverna
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy; (G.G.); (C.D.)
| | - Wulf-Dieter Moll
- BIOMIN Research Centre, Technopark 1, 3430 Tulln an der Donau, Austria; (C.G.); (B.S.); (W.-D.M.); (G.V.); (G.S.)
| | - Gudrun Vogtentanz
- BIOMIN Research Centre, Technopark 1, 3430 Tulln an der Donau, Austria; (C.G.); (B.S.); (W.-D.M.); (G.V.); (G.S.)
| | - Gerd Schatzmayr
- BIOMIN Research Centre, Technopark 1, 3430 Tulln an der Donau, Austria; (C.G.); (B.S.); (W.-D.M.); (G.V.); (G.S.)
| | - Chiara Dall’Asta
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy; (G.G.); (C.D.)
| | - Shreenath Prasad
- BIOMIN Research Centre, Technopark 1, 3430 Tulln an der Donau, Austria; (C.G.); (B.S.); (W.-D.M.); (G.V.); (G.S.)
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Hu B, Zhu X, Lu J. Cathepsin A knockdown decreases the proliferation and invasion of A549 lung adenocarcinoma cells. Mol Med Rep 2020; 21:2553-2559. [PMID: 32323791 PMCID: PMC7185279 DOI: 10.3892/mmr.2020.11068] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 03/13/2020] [Indexed: 02/07/2023] Open
Abstract
Cathepsin A (CTSA) is a lysosomal protease that is abnormally expressed in various types of cancer; however, the function of CTSA in lung adenocarcinoma (LUAD) is unknown. The aim of the present study was to investigate the role of CTSA during LUAD development in vitro. The Cancer Genome Atlas (TCGA) database was used to analyze the expression of CTSA mRNA in LUAD tissues. CTSA was significantly upregulated in LUAD tissues compared with normal lung tissues. To explore the effect of CTSA on LUAD in vitro, LUAD A549 cells were transfected with CTSA small interfering RNA and the hallmarks of tumorigenesis were investigated using cell proliferation, cell cycle, wound healing, invasion and western blot assays. Following CTSA knockdown, proliferation of LUAD cells was decreased and an increased proportion of LUAD cells were arrested at the G0/G1 phase, with altered expression of critical cell cycle and proliferative marker proteins, including p53, p21 and proliferating cell nuclear antigen. Moreover, CTSA knockdown decreased the migration and invasion of A549 cells, as determined by wound healing, invasion, and western blotting assays. The expression levels of key proteins involved in epithelial-mesenchymal transition were analyzed by western blotting. CTSA knockdown enhanced the expression of E-cadherin, but decreased the expression of N-cadherin and β-catenin in A549 cells. To the best of our knowledge, the present study suggested for the first time it has been identified that CTSA may serve as a tumor promoter in LUAD, enhancing the malignant progression of LUAD cells by promoting cell proliferation, migration and invasion. The results suggested that CTSA may serve as a novel therapeutic target for LUAD.
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Affiliation(s)
- Bo Hu
- Department of Thoracic Surgery, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Xike Zhu
- Department of Research Center, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Jibin Lu
- Department of Thoracic Surgery, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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Finsterer J, Scorza CA, Scorza FA, Wakil SM. Update on hereditary, autosomal dominant cathepsin-A-related arteriopathy with strokes and leukoencephalopathy (CARASAL). Acta Neurol Belg 2019; 119:299-303. [PMID: 31177426 DOI: 10.1007/s13760-019-01158-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 05/27/2019] [Indexed: 11/30/2022]
Abstract
Cathepsin-A-related arteriopathy with strokes and leukoencephalopathy (CARASAL) is an acronym that describes an ultra-rare, hereditary, cerebral small vessel disease. The aim is to summarize current knowledge and recent findings concerning phenotype, genotype, pathogenesis, diagnoses, and treatment options of CARASAL. The method used in the study is a systematic literature review. CARASAL is clinically characterized by a wide range of predominantly central nervous system abnormalities. These include migraine, stroke with central facial palsy, facial pain, non-positional vertigo, cognitive dysfunction with impaired concentration and behavioral disinhibition, REM-sleep behavioral disorder, and depression. CARASAL is caused by point mutations in CTSA encoding cathepsin-A. Cathepsin-A is a carboxypeptidase that associates with the lysosomal enzymes b-galactosidase and neuraminidase, promoting their stabilization. In addition, cathepsin-A degradates endothelin-1. CARASAL is a primary microangiopathy with severe atherosclerosis of arterioles and secondary leukoencephalopathy. So far, 19 patients have been reported. The frequency of CARASAL patients will most likely increase in the future, as CARASAL may be more frequently recognized with the increasingly available methods for genetic testing and advanced imaging techniques. The phenotypic and genotypic spectrum of CARASAL needs to be more extensively investigated and animal models for the disease need to be generated. Currently, the outcome cannot be sufficiently assessed, as too few cases have been reported.
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Affiliation(s)
- Josef Finsterer
- Krankenanstalt Rudolfstiftung, Postfach 20, 1180, Vienna, Austria.
| | - Carla A Scorza
- Disciplina de Neurociência, Escola Paulista de Medicine, Universidade Federal de São Paulo/. (EPM/UNIFESP), São Paulo, Brazil
| | - Fulvio A Scorza
- Disciplina de Neurociência, Escola Paulista de Medicine, Universidade Federal de São Paulo/. (EPM/UNIFESP), São Paulo, Brazil
| | - Salma M Wakil
- Department of Genetics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
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Toss M, Miligy I, Gorringe K, Mittal K, Aneja R, Ellis I, Green A, Rakha E. Prognostic significance of cathepsin V (CTSV/CTSL2) in breast ductal carcinoma in situ. J Clin Pathol 2019; 73:76-82. [PMID: 31444238 DOI: 10.1136/jclinpath-2019-205939] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 07/29/2019] [Accepted: 08/10/2019] [Indexed: 12/14/2022]
Abstract
AIMS Cathepsin V (CTSV/CTSL2) is a lysosomal cysteine proteinase and plays a role in extracellular matrix degradation. It is associated with poor prognosis in invasive breast cancer (IBC), but its role in breast ductal carcinoma in situ (DCIS) remains unclear. In this study, we aimed to evaluate the prognostic significance of CTSV in DCIS. METHODS CTSV protein expression was immunohistochemically assessed in a well-characterised and annotated cohort of DCIS comprising pure DCIS (n=776) and DCIS coexisting with IBC (n=239). CTSV expression was analysed in tumour cells and surrounding stroma, including its association with clinicopathological parameters and outcome. RESULTS In pure DCIS, high CTSV expression was observed in 29% of epithelial tumour cells and 20% of surrounding stroma. High expression in both components was associated with features of poor prognosis including higher nuclear grade, hormone receptor negativity and HER2 positivity. In addition, stromal CTSV expression was associated with larger DCIS size, comedo-type necrosis and high proliferation index. DCIS associated with IBC showed higher CTSV expression than pure DCIS either within the epithelial tumour cells or surrounding stroma (p<0.0001 and p=0.001, respectively). In DCIS/IBC, CTSV expression was higher in the invasive component than DCIS component either in tumour cells or surrounding stroma (both p<0.0001). CTSV stromal expression was associated with invasive recurrence independent of other prognostic factors in patients treated with breast conserving surgery (HR=3.0, p=0.005). CONCLUSION High expression of CTSV is associated with poor outcome in DCIS and is a potential marker to predict DCIS progression to invasive disease.
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Affiliation(s)
- Michael Toss
- Histopathology, University of Nottingham School of Medicine, Nottingham, UK
| | - Islam Miligy
- Histopathology, University of Nottingham School of Medicine, Nottingham, UK
| | | | | | | | - Ian Ellis
- Histopathology, University of Nottingham School of Medicine, Nottingham, UK
| | - Andrew Green
- Histopathology, University of Nottingham School of Medicine, Nottingham, UK
| | - Emad Rakha
- Histopathology, University of Nottingham School of Medicine, Nottingham, UK
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12
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Khavrutskii IV, Compton JR, Jurkouich KM, Legler PM. Paired Carboxylic Acids in Enzymes and Their Role in Selective Substrate Binding, Catalysis, and Unusually Shifted p Ka Values. Biochemistry 2019; 58:5351-5365. [PMID: 31192586 DOI: 10.1021/acs.biochem.9b00429] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cathepsin A (CatA, EC 3.4.16.5, UniProtKB P10619 ) is a human lysosomal carboxypeptidase. Counterintuitively, crystal structures of CatA and its homologues show a cluster of Glu and Asp residues binding the C-terminal carboxylic acid of the product or inhibitor. Each of these enzymes functions in an acidic environment and contains a highly conserved pair of Glu residues with side chain carboxyl group oxygens that are approximately 2.3-2.6 Å apart. In small molecules, carboxyl groups separated by ∼3 Å can overcome the repulsive interaction by protonation of one of the two groups. The pKa of one group increases (pKa ∼ 11) and can be as much as ∼6 pH units higher than the paired group. Consequently, at low and neutral pH, one carboxylate can carry a net negative charge while the other can remain protonated and neutral. In CatA, E69 and E149 form a Glu pair that is important to catalysis as evidenced by the 56-fold decrease in kcat/Km in the E69Q/E149Q variant. Here, we have measured the pH dependencies of log(kcat), log(Km), and log(kcat/Km) for wild type CatA and its variants and have compared the measured pKa with calculated values. We propose a substrate-assisted mechanism in which the high pKa of E149 (>8.5) favors the binding of the carboxylate form of the substrate and promotes the abstraction of the proton from H429 of the catalytic triad effectively decreasing its pKa in a low-pH environment. We also identify a similar motif consisting of a pair of histidines in S-formylglutathione hydrolase.
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Affiliation(s)
- Ilja V Khavrutskii
- Armed Forces Radiobiology Research Institute , Uniformed Services University , Bethesda , Maryland 20889-5648 , United States
| | - Jaimee R Compton
- U.S. Naval Research Laboratory , 4555 Overlook Avenue , Washington, D.C. 20375 , United States
| | - Kayla M Jurkouich
- Department of Biomedical Engineering , Case Western Reserve University , Cleveland , Ohio 44106 , United States
| | - Patricia M Legler
- U.S. Naval Research Laboratory , 4555 Overlook Avenue , Washington, D.C. 20375 , United States
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13
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Makino M, Sahara T, Morita N, Ueno H. Carboxypeptidase Y activity and maintenance is modulated by a large helical structure. FEBS Open Bio 2019; 9:1337-1343. [PMID: 31173671 PMCID: PMC6609556 DOI: 10.1002/2211-5463.12686] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 05/20/2019] [Accepted: 06/06/2019] [Indexed: 11/29/2022] Open
Abstract
Yeast carboxypeptidase Y (CPY) is a serine protease with broad substrate specificity. Structurally, CPY belongs to the α/β hydrolase fold family and contains characteristic large helices, termed the V‐shape helix, above the active site cavity. Four intramolecular disulfide bonds are located in and around the V‐shape helix. In this study, mutant CPYs were constructed in which one of these disulfide bonds was disrupted. Mutants lacking the C193–C207 bond located at the beginning of the V‐shape helix aggregated easily, while mutants lacking the C262–C268 bond located at the end of the V‐shape helix displayed decreased hydrolytic activity. The results indicate that the V‐shape helix is involved in CPY catalysis and in maintenance of its conformation.
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Affiliation(s)
- Mai Makino
- Department of Biochemistry, Nara Medical University, Kashihara, Japan
| | - Takehiko Sahara
- Bio-Design Research Group, Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Naoki Morita
- Molecular and Biological Technology Research Group, Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sapporo, Japan
| | - Hiroshi Ueno
- Laboratory of Biochemistry and Applied Microbiology, School of Agriculture, Ryukoku University, Otsu, Japan
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14
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Toss MS, Miligy IM, Haj-Ahmad R, Gorringe KL, AlKawaz A, Mittal K, Ellis IO, Green AR, Rakha EA. The prognostic significance of lysosomal protective protein (cathepsin A) in breast ductal carcinoma in situ. Histopathology 2019; 74:1025-1035. [PMID: 30725481 DOI: 10.1111/his.13835] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 02/03/2019] [Indexed: 12/14/2022]
Abstract
AIMS Cathepsin A (CTSA) is a key regulatory enzyme for galactoside metabolism. Additionally, it has a distinct proteolytic activity and plays a role in tumour progression. CTSA is differentially expressed at the mRNA level between breast ductal carcinoma in situ (DCIS) and invasive breast carcinoma (IBC). In this study, we aimed to characterise CTSA protein expression in DCIS and evaluate its prognostic significance. METHODS AND RESULTS A large cohort of DCIS [n = 776 for pure DCIS and n = 239 for DCIS associated with IBC (DCIS/IBC)] prepared as a tissue microarray was immunohistochemically stained for CTSA. High CTSA expression was observed in 48% of pure DCIS. High expression was associated with features of poor DCIS prognosis, including younger age at diagnosis (<50 years), higher nuclear grade, hormone receptor negativity, HER2 positivity, high proliferative index and high hypoxia inducible factor 1 alpha expression. High CTSA expression was associated with shorter recurrence-free interval (RFI) (P = 0.0001). In multivariate survival analysis for patients treated with breast conserving surgery, CTSA was an independent predictor of shorter RFI (P = 0.015). DCIS associated with IBC showed higher CTSA expression than pure DCIS (P = 0.04). In the DCIS/IBC cohort, CTSA expression was higher in the invasive component than the DCIS component (P < 0.0001). CONCLUSION CTSA is not only associated with aggressive behaviour and poor outcome in DCIS but also a potential marker to predict co-existing invasion in DCIS.
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Affiliation(s)
- Michael S Toss
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK.,Histopathology Department, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
| | - Islam M Miligy
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK.,Histopathology Department, Faculty of Medicine, Menoufia University, Menoufia, Egypt
| | - Rita Haj-Ahmad
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK
| | - Kylie L Gorringe
- Cancer Genomics Program, Peter MacCallum Cancer Centre, Melbourne, Australia.,The Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Australia
| | - Abdulbaqi AlKawaz
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK.,College of Dentistry, Al Mustansiriya University, Baghdad, Iraq
| | | | - Ian O Ellis
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK
| | - Andrew R Green
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK
| | - Emad A Rakha
- Nottingham Breast Cancer Research Centre, Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham City Hospital, Notts, UK.,Histopathology Department, Faculty of Medicine, Menoufia University, Menoufia, Egypt
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15
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Cui Y, Wang Y, Liu M, Qiu L, Xing P, Wang X, Ying G, Li B. Determination of glucose deficiency-induced cell death by mitochondrial ATP generation-driven proton homeostasis. J Mol Cell Biol 2018; 9:395-408. [PMID: 28369514 DOI: 10.1093/jmcb/mjx011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 03/21/2017] [Indexed: 01/05/2023] Open
Abstract
Glucose is one of major nutrients and its catabolism provides energy and/or building bricks for cell proliferation. Glucose deficiency results in cell death. However, the underlying mechanism still remains elusive. By using our recently developed method to monitor real-time cellular apoptosis and necrosis, we show that glucose deprivation can directly elicit necrosis, which is promoted by mitochondrial impairment, depending on mitochondrial adenosine triphosphate (ATP) generation instead of ATP depletion. We demonstrate that glucose metabolism is the major source to produce protons. Glucose deficiency leads to lack of proton provision while mitochondrial electron transfer chain continues consuming protons to generate energy, which provokes a compensatory lysosomal proton efflux and resultant increased lysosomal pH. This lysosomal alkalinization can trigger apoptosis or necrosis depending on the extent of alkalinization. Taken together, our results build up a metabolic connection between glycolysis, mitochondrion, and lysosome, and reveal an essential role of glucose metabolism in maintaining proton homeostasis to support cell survival.
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Affiliation(s)
- Yanfen Cui
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Yuanyuan Wang
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Miao Liu
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Li Qiu
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Pan Xing
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Xin Wang
- The First Department of Breast Tumor, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Guoguang Ying
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Binghui Li
- Laboratory of Cancer Cell Biology, Key Laboratory of Breast Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
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