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Vashum Y, Premsingh R, Kottaiswamy A, Soma M, Padmanaban A, Kalaiselvan P, Samuel S. Inhibitory effect of cathepsin K inhibitor (ODN-MK-0822) on invasion, migration and adhesion of human breast cancer cells in vitro. Mol Biol Rep 2020; 48:105-116. [PMID: 33294960 DOI: 10.1007/s11033-020-05951-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 10/23/2020] [Indexed: 11/29/2022]
Abstract
Approximately 90% of patients with advanced breast cancer develop bone metastases; an event that results in severe decrease of quality of life and a drastic deterioration in prognosis. Therefore, to increase the survival of breast cancer patients, the development of new therapeutic strategies to impair metastatic process and skeletal complications is critical. Previous studies on the role of cathepsin K (CTSK) in metastatic spreading led to several strategies for inhibition of this molecule such as MIV-711 (Medivir), balicatib and odanacatib (ODN) which were on trial in the past. The present study intended to assess the anti-metastatic efficacy of ODN in breast cancer cells. Human breast cancer cell lines MDA-MB-231 were treated with different concentrations of ODN and performed invasion, adhesion and migration assays and, RT-PCR and western blot to evaluate the effect of ODN on the metastatic potential of breast cancer cells. ODN markedly decreased wound healing cell migration, invasion and adhesion at a dose dependent manner. ODN inhibits cell invasion by decreasing the matrix metalloproteinase (MMP-9) with the upregulation of TIMP-1 expression. ODN effectively inhibited the phosphorylation of extracellular signal-regulated kinase (ERK), p38, and c-Jun N-terminal Kinase (JNK), and blocked the expression of β-integrins and FAK proteins. ODN also significantly inhibited PI3K downstream targets Rac1, Cdc42, paxillin and Src which are critical for cell adhesion, migration and cytoskeletal reorganization. ODN exerts anti-metastatic action through inhibition of signaling pathway for MMP-9, PI3K and MAPK. This indicates potential therapeutic effects of ODN in the treatment of metastatic breast cancer.
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Affiliation(s)
- Yaongamphi Vashum
- Department of Biochemistry, Armed Forces Medical College, Pune, India
| | - Riya Premsingh
- Department of Biochemistry and Chemical Biology, Indian Institute of Science Education & Research (IISER), Pune, India
| | - Amuthavalli Kottaiswamy
- Department of Biochemistry, VRR Institute of Biomedical Science (Affiliated to University of Madras), Chennai, India
| | - Mathangi Soma
- Department of Biochemistry, VRR Institute of Biomedical Science (Affiliated to University of Madras), Chennai, India
| | - Abirami Padmanaban
- Department of Biochemistry, VRR Institute of Biomedical Science (Affiliated to University of Madras), Chennai, India
| | - Parkavi Kalaiselvan
- Department of Medicine and Surgery, Chettinad Hospital and Research Institute, Chennai, India
| | - Shila Samuel
- Department of Biochemistry, VRR Institute of Biomedical Science (Affiliated to University of Madras), Chennai, India.
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Weber J, McInnes J, Kizilirmak C, Rehders M, Qatato M, Wirth EK, Schweizer U, Verrey F, Heuer H, Brix K. Interdependence of thyroglobulin processing and thyroid hormone export in the mouse thyroid gland. Eur J Cell Biol 2017; 96:440-456. [PMID: 28274595 DOI: 10.1016/j.ejcb.2017.02.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/08/2017] [Accepted: 02/09/2017] [Indexed: 02/08/2023] Open
Abstract
Thyroid hormone (TH) target cells need to adopt mechanisms to maintain sufficient levels of TH to ensure regular functions. This includes thyroid epithelial cells, which generate TH in addition to being TH-responsive. However, the cellular and molecular pathways underlying thyroid auto-regulation are insufficiently understood. In order to investigate whether thyroglobulin processing and TH export are sensed by thyrocytes, we inactivated thyroglobulin-processing cathepsins and TH-exporting monocarboxylate transporters (Mct) in the mouse. The states of thyroglobulin storage and its protease-mediated processing and degradation were related to the levels of TH transporter molecules by immunoblotting and immunofluorescence microscopy. Thyroid epithelial cells of cathepsin-deficient mice showed increased Mct8 protein levels at the basolateral plasma membrane domains when compared to wild type controls. While the protein amounts of the thyroglobulin-degrading cathepsin D remained largely unaffected by Mct8 or Mct10 single-deficiencies, a significant increase in the amounts of the thyroglobulin-processing cathepsins B and L was detectable in particular in Mct8/Mct10 double deficiency. In addition, it was observed that larger endo-lysosomes containing cathepsins B, D, and L were typical for Mct8- and/or Mct10-deficient mouse thyroid epithelial cells. These data support the notion of a crosstalk between TH transporters and thyroglobulin-processing proteases in thyroid epithelial cells. We conclude that a defect in exporting thyroxine from thyroid follicles feeds back positively on its cathepsin-mediated proteolytic liberation from the precursor thyroglobulin, thereby adding to the development of auto-thyrotoxic states in Mct8 and/or Mct10 deficiencies. The data suggest TH sensing molecules within thyrocytes that contribute to thyroid auto-regulation.
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Affiliation(s)
- Jonas Weber
- Jacobs University Bremen, Department of Life Sciences and Chemistry, Campus Ring 1, D-28759 Bremen, Germany
| | - Joseph McInnes
- Jacobs University Bremen, Department of Life Sciences and Chemistry, Campus Ring 1, D-28759 Bremen, Germany
| | - Cise Kizilirmak
- Jacobs University Bremen, Department of Life Sciences and Chemistry, Campus Ring 1, D-28759 Bremen, Germany
| | - Maren Rehders
- Jacobs University Bremen, Department of Life Sciences and Chemistry, Campus Ring 1, D-28759 Bremen, Germany
| | - Maria Qatato
- Jacobs University Bremen, Department of Life Sciences and Chemistry, Campus Ring 1, D-28759 Bremen, Germany
| | - Eva K Wirth
- Charité-Universitätsmedizin Berlin, Institut für Experimentelle Endokrinologie, Augustenburger Platz 1, D-13353 Berlin, Germany
| | - Ulrich Schweizer
- Universität Bonn, Institut für Biochemie und Molekularbiologie, Nußallee 11, D-53115 Bonn, Germany
| | - Francois Verrey
- Universität Zürich, Physiologisches Institut, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Heike Heuer
- IUF - Leibniz Institut für umweltmedizinische Forschung, Auf'm Hennekamp 50, D-40225 Düsseldorf, Germany
| | - Klaudia Brix
- Jacobs University Bremen, Department of Life Sciences and Chemistry, Campus Ring 1, D-28759 Bremen, Germany.
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Zhou Y, Chen H, Liu L, Yu X, Sukhova GK, Yang M, Kyttaris VC, Stillman IE, Gelb B, Libby P, Tsokos GC, Shi GP. Cathepsin K Deficiency Ameliorates Systemic Lupus Erythematosus-like Manifestations in Faslpr Mice. THE JOURNAL OF IMMUNOLOGY 2017; 198:1846-1854. [PMID: 28093526 DOI: 10.4049/jimmunol.1501145] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 12/19/2016] [Indexed: 12/29/2022]
Abstract
Cysteinyl cathepsin K (CatK) is expressed in osteoclasts to mediate bone resorption, but is also inducible under inflammatory conditions. Faslpr mice on a C57BL/6 background develop spontaneous systemic lupus erythematosus-like manifestations. Although normal mouse kidneys expressed negligible CatK, those from Faslpr mice showed elevated CatK expression in the glomeruli and tubulointerstitial space. Faslpr mice also showed elevated serum CatK levels. CatK deficiency in Faslpr mice reduced all tested kidney pathologies, including glomerulus and tubulointerstitial scores, glomerulus complement C3 and IgG deposition, chemokine expression and macrophage infiltration, and serum autoantibodies. CatK contributed to Faslpr mouse autoimmunity and pathology in part by its activity in TLR-7 proteolytic processing and consequent regulatory T (Treg) cell biology. Elevated TLR7 expression and proteolytic processing in Faslpr mouse kidneys and Tregs showed significantly reduced levels in CatK-deficient mice, leading to increased spleen and kidney Treg content. Purified CD4+CD25highFoxp3+ Tregs from CatK-deficient mice doubled their immunosuppressive activity against T effector cells, compared with those from CatK-sufficient mice. In Faslpr mice, repopulation of purified Tregs from CatK-sufficient mice reduced spleen sizes, autoantibody titers, and glomerulus C3 and IgG deposition, and increased splenic and kidney Treg contents. Tregs from CatK-deficient mice had significantly more potency than CatK-sufficient Tregs in reducing spleen sizes, serum autoantibody titers, and glomerulus C3 deposition, and in increasing splenic and kidney Treg content. This study established a possible role of CatK in TLR7 proteolytic activation, Treg immunosuppressive activity, and lupus autoimmunity and pathology.
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Affiliation(s)
- Yi Zhou
- Department of Nephrology, First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China.,Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115
| | - Huimei Chen
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.,Research Institute of Nephrology, Nanjing University School of Medicine, Nanjing 210002, China
| | - Li Liu
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.,Department of Biology, School of Life Science, Huzhou Teachers College, Huzhou, Zhejiang 313000, China
| | - Xueqing Yu
- Department of Nephrology, First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China;
| | - Galina K Sukhova
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115
| | - Min Yang
- Department of Rheumatology, Nan Fang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Vasileios C Kyttaris
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Isaac E Stillman
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Bruce Gelb
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY 10029; and.,Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029
| | - Peter Libby
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115
| | - George C Tsokos
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Guo-Ping Shi
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115;
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Abstract
The GI tract is the most exposed organ to proteases, both in physiological and pathophysiological conditions. For digestive purposes, the lumen of the upper GI tract contains large amounts of pancreatic proteases, but studies have also demonstrated increased proteolytic activity into mucosal tissues (both in the upper and lower GI tract), associated with pathological conditions. This review aims at outlining the evidences for dysregulated proteolytic homeostasis in GI diseases and the pathogenic mechanisms of increased proteolytic activity. The therapeutic potential of protease inhibition in GI diseases is discussed, with a particular focus on IBDs, functional GI disorders and colorectal cancer.
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Affiliation(s)
- Nathalie Vergnolle
- Inserm, U1220, Toulouse, France,Université de Toulouse, Université Paul Sabatier, Institut de Recherche en Santé Digestive (IRSD), Toulouse, France,Inra, U1416, Toulouse, France,Ecole Nationale Vétérinaire de Toulouse (ENVT), France,Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada
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5
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Barlow N, Nasser Y, Zhao P, Sharma N, Guerrero-Alba R, Edgington-Mitchell LE, Lieu T, Veldhuis NA, Poole DP, Conner JW, Lindström E, Craig AW, Graham B, Vanner SJ, Bunnett NW. Demonstration of elevated levels of active cathepsin S in dextran sulfate sodium colitis using a new activatable probe. Neurogastroenterol Motil 2015; 27:1675-80. [PMID: 26303377 DOI: 10.1111/nmo.12656] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 07/17/2015] [Indexed: 02/08/2023]
Abstract
BACKGROUND Proteases play a major role in inflammatory diseases of the gastrointestinal tract. Activatable probes are a major technological advance, enabling sensitive detection of active proteases in tissue samples. Our aim was to synthesize an activatable probe for cathepsin S and validate its use in a mouse model of colitis. METHODS We designed and synthesized a new fluorescent activatable probe, NB200, for the detection of active cathepsin S. Colitis was induced in C57BL/6 mice by the administration of 3% dextran sulfate sodium (DSS). Homogenized mouse colons, with or without the addition of the specific cathepsin S inhibitor MV026031, were incubated with NB200 in a fluorescent plate reader. KEY RESULTS NB200 selectively detected purified cathepsin S and not other common inflammatory proteases. Homogenates of colon from mice with DSS colitis induced a significant fluorescent increase when compared to control animals (control vs DSS: p < 0.05 at 200 min and p < 0.01 at 220-240 min), indicating cathepsin S activation. The cathepsin S inhibitor abolished this increase in fluorescence (DSS vs DSS + MV026031: p < 0.05 at 140 min, p < 0.01 at 180 min, p < 0.001 at 200-240 min), which confirms cathepsin S activation. Cathepsin S activity correlated with the disease activity index (Spearman r = 0.77, p = 0.017). CONCLUSIONS & INFERENCES Our investigation has demonstrated the utility of activatable probes for detecting protease activity in intestinal inflammation. Panels of such probes may allow 'signature' protease profiles to be established for a range of inflammatory diseases and disorders.
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Affiliation(s)
- N Barlow
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - Y Nasser
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, ON, Canada
| | - P Zhao
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - N Sharma
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada
| | - R Guerrero-Alba
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, ON, Canada
| | - L E Edgington-Mitchell
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - T Lieu
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - N A Veldhuis
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - D P Poole
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia.,Department of Anatomy and Neuroscience, University of Melbourne, Parkville, Vic., Australia
| | - J W Conner
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | | | - A W Craig
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, Canada
| | - B Graham
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
| | - S J Vanner
- Gastrointestinal Diseases Research Unit, Division of Gastroenterology, Queen's University, Kingston, ON, Canada
| | - N W Bunnett
- Monash Institute of Pharmaceutical Sciences Parkville Australia, Parkville, Vic., Australia
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Tamhane T, Lllukkumbura R, Lu S, Maelandsmo GM, Haugen MH, Brix K. Nuclear cathepsin L activity is required for cell cycle progression of colorectal carcinoma cells. Biochimie 2015; 122:208-18. [PMID: 26343556 DOI: 10.1016/j.biochi.2015.09.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 09/01/2015] [Indexed: 10/23/2022]
Abstract
Prominent tasks of cysteine cathepsins involve endo-lysosomal proteolysis and turnover of extracellular matrix constituents or plasma membrane proteins for maintenance of intestinal homeostasis. Here we report on enhanced levels and altered subcellular localization of distinct cysteine cathepsins in adenocarcinoma tissue in comparison to adjacent normal colon. Immunofluorescence and immunoblotting investigations revealed the presence of cathepsin L in the nuclear compartment in addition to its expected endo-lysosomal localization in colorectal carcinoma cells. Cathepsin L was represented as the full-length protein in the nuclei of HCT116 cells from which stefin B, a potent cathepsin L inhibitor, was absent. Fluorescence activated cell sorting analyses with synchronized cell cultures revealed deceleration of cell cycle progression of HCT116 cells upon inhibition of cathepsin L activity, while expression of cathepsin L-enhanced green fluorescent protein chimeras accelerated S-phase entry. We conclude that the activity of cathepsin L is high in the nucleus of colorectal carcinoma cells because of lacking stefin B inhibitory activity. Furthermore, we hypothesize that nuclear cathepsin L accelerates cell cycle progression of HCT116 cells thereby supporting the notion that cysteine cathepsins may play significant roles in carcinogenesis due to deregulated trafficking.
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Affiliation(s)
- Tripti Tamhane
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany.
| | - Rukshala Lllukkumbura
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany.
| | - Shiying Lu
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany.
| | - Gunhild M Maelandsmo
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway.
| | - Mads H Haugen
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany; Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway.
| | - Klaudia Brix
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany.
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Brix K, McInnes J, Al-Hashimi A, Rehders M, Tamhane T, Haugen MH. Proteolysis mediated by cysteine cathepsins and legumain-recent advances and cell biological challenges. PROTOPLASMA 2015; 252:755-774. [PMID: 25398648 DOI: 10.1007/s00709-014-0730-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 11/04/2014] [Indexed: 06/04/2023]
Abstract
Proteases play essential roles in protein degradation, protein processing, and extracellular matrix remodeling in all cell types and tissues. They are also involved in protein turnover for maintenance of homeostasis and protein activation or inactivation for cell signaling. Proteases range in function and specificity, with some performing distinct substrate cleavages, while others accomplish proteolysis of a wide range of substrates. As such, different cell types use specialized molecular mechanisms to regulate the localization of proteases and their function within the compartments to which they are destined. Here, we focus on the cysteine family of cathepsin proteases and legumain, which act predominately within the endo-lysosomal pathway. In particular, recent knowledge on cysteine cathepsins and their primary regulator legumain is scrutinized in terms of their trafficking to endo-lysosomal compartments and other less recognized cellular locations. We further explore the mechanisms that regulate these processes and point to pathological cases which arise from detours taken by these proteases. Moreover, the emerging biological roles of specific forms and variants of cysteine cathepsins and legumain are discussed. These may be decisive, pathogenic, or even deadly when localizing to unusual cellular compartments in their enzymatically active form, because they may exert unexpected effects by alternative substrate cleavage. Hence, we propose future perspectives for addressing the actions of cysteine cathepsins and legumain as well as their specific forms and variants. The increasing knowledge in non-canonical aspects of cysteine cathepsin- and legumain-mediated proteolysis may prove valuable for developing new strategies to utilize these versatile proteases in therapeutic approaches.
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Affiliation(s)
- Klaudia Brix
- Research Area HEALTH, Research Center MOLIFE-Molecular Life Sciences, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany,
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8
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Expression analysis of all protease genes reveals cathepsin K to be overexpressed in glioblastoma. PLoS One 2014; 9:e111819. [PMID: 25356585 PMCID: PMC4214761 DOI: 10.1371/journal.pone.0111819] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 10/01/2014] [Indexed: 01/26/2023] Open
Abstract
Background Cancer genome and transcriptome analyses advanced our understanding of cancer biology. We performed transcriptome analysis of all known genes of peptidases also called proteases and their endogenous inhibitors in glioblastoma multiforme (GBM), which is one of the most aggressive and deadly types of brain cancers, where unbalanced proteolysis is associated with tumor progression. Methods Comparisons were performed between the transcriptomics of primary GBM tumors and unmatched non-malignant brain tissue, and between GBM cell lines (U87-MG and U373) and a control human astrocyte cell line (NHA). Publicly-available data sets and our own datasets were integrated and normalized using bioinformatics tools to reveal protease and protease inhibitor genes with deregulated expression in both malignant versus non-malignant tissues and cells. Results Of the 311 protease genes identified to be differentially expressed in both GBM tissues and cells, 5 genes were highly overexpressed, 2 genes coding for non-peptidase homologues transferrin receptor (TFRC) and G protein-coupled receptor 56 (GPR56), as well as 3 genes coding for the proteases endoplasmic reticulum aminopeptidase 2 (ERAP2), glutamine-fructose-6-phosphate transaminase 2 (GFPT2) and cathepsin K (CTSK), whereas one gene, that of the serine protease carboxypeptidase E (CPE) was strongly reduced in expression. Seventy five protease inhibitor genes were differentially expressed, of which 3 genes were highly overexpressed, the genes coding for stefin B (CSTB), peptidase inhibitor 3 (PI3 also named elafin) and CD74. Seven out of 8 genes (except CSTB) were validated using RT-qPCR in GBM cell lines. CTSK overexpression was validated using RT-qPCR in GBM tissues as well. Cathepsin K immunohistochemical staining and western blotting showed that only proteolytically inactive proforms of cathepsin K were overexpressed in GBM tissues and cells. Conclusions The presence of high levels of inactive proforms of cathepsin K in GBM tissues and cells indicate that in GBM the proteolytic/collagenolytic role is not its primary function but it plays rather a different yet unknown role.
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Alroy J, Garganta C, Wiederschain G. Secondary biochemical and morphological consequences in lysosomal storage diseases. BIOCHEMISTRY (MOSCOW) 2014; 79:619-36. [DOI: 10.1134/s0006297914070049] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Fonović M, Turk B. Cysteine cathepsins and extracellular matrix degradation. Biochim Biophys Acta Gen Subj 2014; 1840:2560-70. [PMID: 24680817 DOI: 10.1016/j.bbagen.2014.03.017] [Citation(s) in RCA: 232] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 03/16/2014] [Accepted: 03/22/2014] [Indexed: 01/03/2023]
Abstract
BACKGROUND Cysteine cathepsins are normally found in the lysosomes where they are involved in intracellular protein turnover. Their ability to degrade the components of the extracellular matrix in vitro was first reported more than 25years ago. However, cathepsins were for a long time not considered to be among the major players in ECM degradation in vivo. During the last decade it has, however, become evident that abundant secretion of cysteine cathepsins into extracellular milieu is accompanying numerous physiological and disease conditions, enabling the cathepsins to degrade extracellular proteins. SCOPE OF VIEW In this review we will focus on cysteine cathepsins and their extracellular functions linked with ECM degradation, including regulation of their activity, which is often enhanced by acidification of the extracellular microenvironment, such as found in the bone resorption lacunae or tumor microenvironment. We will further discuss the ECM substrates of cathepsins with a focus on collagen and elastin, including the importance of that for pathologies. Finally, we will overview the current status of cathepsin inhibitors in clinical development for treatment of ECM-linked diseases, in particular osteoporosis. MAJOR CONCLUSIONS Cysteine cathepsins are among the major proteases involved in ECM remodeling, and their role is not limited to degradation only. Deregulation of their activity is linked with numerous ECM-linked diseases and they are now validated targets in a number of them. Cathepsins S and K are the most attractive targets, especially cathepsin K as a major therapeutic target for osteoporosis with drugs targeting it in advanced clinical trials. GENERAL SIGNIFICANCE Due to their major role in ECM remodeling cysteine cathepsins have emerged as an important group of therapeutic targets for a number of ECM-related diseases, including, osteoporosis, cancer and cardiovascular diseases. This article is part of a Special Issue entitled Matrix-mediated cell behaviour and properties.
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Affiliation(s)
- Marko Fonović
- Department of Biochemistry, Molecular and Structural Biology, Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia; Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
| | - Boris Turk
- Department of Biochemistry, Molecular and Structural Biology, Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia; Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova cesta 39, SI-1000 Ljubljana, Slovenia; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Slovenia.
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Abstract
PURPOSE OF REVIEW To summarize the recent knowledge regarding intestinal proteases and the gut barrier. RECENT FINDINGS It is now well established that intestinal proteases, such as matrix metalloproteinase (MMP)-1, MMP-3, MMP-10 and MMP-12, are key players in the development of ulcers in inflammatory bowel disease, have direct effects on epithelial barrier function and are involved in epithelial restitution. However, more recent work has suggested that the membrane-anchored epithelial cell serine protease matriptase is critical in maintaining the gut barrier, and roles have also been described for elastase, MMP-13, gelatinases, mast cell proteases and proteases derived from parasites and gut bacteria. Interestingly, epithelial proteases often co-localize with epithelial adherens junctions, and nonepithelial-derived proteases have junctional proteins as targets. SUMMARY The role of proteases in controlling normal barrier function in the gut is now becoming very clear, to go alongside their role in intestinal inflammation.
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