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Majc B, Habič A, Novak M, Rotter A, Porčnik A, Mlakar J, Župunski V, Fonović UP, Knez D, Zidar N, Gobec S, Kos J, Turnšek TL, Pišlar A, Breznik B. Upregulation of Cathepsin X in Glioblastoma: Interplay with γ-Enolase and the Effects of Selective Cathepsin X Inhibitors. Int J Mol Sci 2022; 23:ijms23031784. [PMID: 35163706 PMCID: PMC8836869 DOI: 10.3390/ijms23031784] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 01/28/2022] [Accepted: 02/01/2022] [Indexed: 12/26/2022] Open
Abstract
Glioblastoma (GBM) is the most common and deadly primary brain tumor in adults. Understanding GBM pathobiology and discovering novel therapeutic targets are critical to finding efficient treatments. Upregulation of the lysosomal cysteine carboxypeptidase cathepsin X has been linked to immune dysfunction and neurodegenerative diseases, but its role in cancer and particularly in GBM progression in patients is unknown. In this study, cathepsin X expression and activity were found to be upregulated in human GBM tissues compared to low-grade gliomas and nontumor brain tissues. Cathepsin X was localized in GBM cells as well as in tumor-associated macrophages and microglia. Subsequently, potent irreversible (AMS36) and reversible (Z7) selective cathepsin X inhibitors were tested in vitro. Selective cathepsin X inhibitors decreased the viability of patient-derived GBM cells as well as macrophages and microglia that were cultured in conditioned media of GBM cells. We next examined the expression pattern of neuron-specific enzyme γ-enolase, which is the target of cathepsin X. We found that there was a correlation between high proteolytic activity of cathepsin X and C-terminal cleavage of γ-enolase and that cathepsin X and γ-enolase were colocalized in GBM tissues, preferentially in GBM-associated macrophages and microglia. Taken together, our results on patient-derived material suggest that cathepsin X is involved in GBM progression and is a potential target for therapeutic approaches against GBM.
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Affiliation(s)
- Bernarda Majc
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, 111 Večna pot, 1000 Ljubljana, Slovenia; (B.M.); (A.H.); (M.N.); (A.R.); (T.L.T.)
- Jozef Stefan International Postgraduate School, 39 Jamova cesta, 1000 Ljubljana, Slovenia
| | - Anamarija Habič
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, 111 Večna pot, 1000 Ljubljana, Slovenia; (B.M.); (A.H.); (M.N.); (A.R.); (T.L.T.)
- Jozef Stefan International Postgraduate School, 39 Jamova cesta, 1000 Ljubljana, Slovenia
| | - Metka Novak
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, 111 Večna pot, 1000 Ljubljana, Slovenia; (B.M.); (A.H.); (M.N.); (A.R.); (T.L.T.)
| | - Ana Rotter
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, 111 Večna pot, 1000 Ljubljana, Slovenia; (B.M.); (A.H.); (M.N.); (A.R.); (T.L.T.)
| | - Andrej Porčnik
- Department of Neurosurgery, University Medical Centre Ljubljana, 7 Zaloška cesta, 1000 Ljubljana, Slovenia;
| | - Jernej Mlakar
- Institute of Pathology, Faculty of Medicine, University of Ljubljana, 2 Korytkova ulica, 1000 Ljubljana Slovenia;
| | - Vera Župunski
- Chair of Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, 113 Večna pot, 1000 Ljubljana, Slovenia;
| | - Urša Pečar Fonović
- Faculty of Pharmacy, University of Ljubljana, 7 Aškerčeva cesta, 1000 Ljubljana, Slovenia; (U.P.F.); (D.K.); (N.Z.); (S.G.); (J.K.)
| | - Damijan Knez
- Faculty of Pharmacy, University of Ljubljana, 7 Aškerčeva cesta, 1000 Ljubljana, Slovenia; (U.P.F.); (D.K.); (N.Z.); (S.G.); (J.K.)
| | - Nace Zidar
- Faculty of Pharmacy, University of Ljubljana, 7 Aškerčeva cesta, 1000 Ljubljana, Slovenia; (U.P.F.); (D.K.); (N.Z.); (S.G.); (J.K.)
| | - Stanislav Gobec
- Faculty of Pharmacy, University of Ljubljana, 7 Aškerčeva cesta, 1000 Ljubljana, Slovenia; (U.P.F.); (D.K.); (N.Z.); (S.G.); (J.K.)
| | - Janko Kos
- Faculty of Pharmacy, University of Ljubljana, 7 Aškerčeva cesta, 1000 Ljubljana, Slovenia; (U.P.F.); (D.K.); (N.Z.); (S.G.); (J.K.)
| | - Tamara Lah Turnšek
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, 111 Večna pot, 1000 Ljubljana, Slovenia; (B.M.); (A.H.); (M.N.); (A.R.); (T.L.T.)
- Chair of Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, 113 Večna pot, 1000 Ljubljana, Slovenia;
| | - Anja Pišlar
- Faculty of Pharmacy, University of Ljubljana, 7 Aškerčeva cesta, 1000 Ljubljana, Slovenia; (U.P.F.); (D.K.); (N.Z.); (S.G.); (J.K.)
- Correspondence: (B.B.); Tel.: +386-(0)59-232-870; (A.P.), Tel.: +386-(0)14-169-526
| | - Barbara Breznik
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, 111 Večna pot, 1000 Ljubljana, Slovenia; (B.M.); (A.H.); (M.N.); (A.R.); (T.L.T.)
- Correspondence: (B.B.); Tel.: +386-(0)59-232-870; (A.P.), Tel.: +386-(0)14-169-526
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Jakoš T, Prunk M, Pišlar A, Kos J. Cathepsin X Activity Does Not Affect NK-Target Cell Synapse but Is Rather Distributed to Cytotoxic Granules. Int J Mol Sci 2021; 22:13495. [PMID: 34948293 DOI: 10.3390/ijms222413495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/12/2021] [Accepted: 12/13/2021] [Indexed: 11/17/2022] Open
Abstract
Cathepsin X is a lysosomal peptidase that is involved in tumour progression and represents a potential target for therapeutic interventions. In addition, it regulates important functions of immune cells and is implicated in the modulation of tumour cell–immune cell crosstalk. Selective cathepsin X inhibitors have been proposed as prospective antitumour agents to prevent cancer progression; however, their impact on the antitumour immune response has been overlooked. Previous studies indicate that the migration and adhesion of T cells and dendritic cells are affected by diminished cathepsin X activity. Meanwhile, the influence of cathepsin X inhibition on natural killer (NK) cell function has not yet been explored. Here, we examined the localization patterns of cathepsin X and the role of its inhibitors on the cytotoxicity of cell line NK-92, which is used for adoptive cellular immunotherapy in cancer patients. NK-92 cells depend on lymphocyte function-associated antigen 1 (LFA-1) to form stable immunoconjugates with target cells, providing, in this way, optimal cytotoxicity. Since LFA-1 is a substrate for cathepsin X activity in other types of cells, we hypothesized that cathepsin X could disturb the formation of NK-92 immunoconjugates. Thus, we employed cathepsin X reversible and irreversible inhibitors and evaluated their effects on the NK-92 cell interactions with target cells and on the NK-92 cell cytotoxicity. We show that cathepsin X inhibition does not impair stable conjugate formation or the lytic activity of NK-92 cells. Similarly, the conjugate formation between Jurkat T cells and target cells was not affected by cathepsin X activity. Unlike in previous migration and adhesion studies on T cells, in NK-92 cells cathepsin X was not co-localized with LFA-1 at the plasma membrane but was, rather, redistributed to the cytotoxic granules and secreted during degranulation.
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Pišlar A, Tratnjek L, Glavan G, Zidar N, Živin M, Kos J. Neuroinflammation-Induced Upregulation of Glial Cathepsin X Expression and Activity in vivo. Front Mol Neurosci 2020; 13:575453. [PMID: 33328882 PMCID: PMC7714997 DOI: 10.3389/fnmol.2020.575453] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 10/28/2020] [Indexed: 01/12/2023] Open
Abstract
Neuroinflammation is an important factor in the pathogenesis of neurodegenerative diseases. Microglia-derived lysosomal cathepsins have been increasingly recognized as important inflammatory mediators that trigger signaling pathways that aggravate neuroinflammation. In vitro, a contribution to neuroinflammation processes has been shown for cathepsin X: however, the expression patterns and functional role of cathepsin X in neuroinflammatory brain pathology remain elusive. In this study we analyzed the expression, activity, regional distribution and cellular localization of cathepsin X in the rat brain with neuroinflammation-induced neurodegeneration. The unilateral injection of lipopolysaccharide (LPS) induced a strong upregulation of cathepsin X expression and its activity in the ipsilateral striatum. In addition to the striatum, cathepsin X overexpression was detected in other brain areas such as the cerebral cortex, corpus callosum, subventricular zone and external globus pallidus, whereas the upregulation was mainly restricted to activated microglia and reactive astrocytes. Continuous administration of the cathepsin X inhibitor AMS36 indicated protective effects against LPS-induced striatal degeneration, as seen by the attenuated LPS-mediated dilation of the lateral ventricles and partial decreased extent of striatal lesion. Taken together, our results indicate that cathepsin X plays a role as a pathogenic factor in neuroinflammation-induced neurodegeneration and represents a potential therapeutic target for neurodegenerative diseases associated with neuroinflammation.
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Affiliation(s)
- Anja Pišlar
- Department of Pharmaceutical Biology, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - Larisa Tratnjek
- Institute of Pathophysiology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia.,Institute of Cell Biology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Gordana Glavan
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Nace Zidar
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - Marko Živin
- Institute of Pathophysiology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Janko Kos
- Department of Pharmaceutical Biology, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia.,Department of Biotechnology, Jožef Stefan Institute, Ljubljana, Slovenia
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Pišlar A, Tratnjek L, Glavan G, Živin M, Kos J. Upregulation of Cysteine Protease Cathepsin X in the 6-Hydroxydopamine Model of Parkinson's Disease. Front Mol Neurosci 2018; 11:412. [PMID: 30450037 PMCID: PMC6225071 DOI: 10.3389/fnmol.2018.00412] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 10/24/2018] [Indexed: 12/11/2022] Open
Abstract
Parkinson’s disease (PD) is a neurodegenerative disorder characterized by loss of midbrain dopaminergic neurons in the substantia nigra pars compacta (SNc). In vitro, a contribution to neuroinflammation and neurotoxicity has been shown for the lysosomal protease cathepsin X; however, its expression and its role in PD remain unknown. Therefore, the current study was designed to address the regional, cellular, and subcellular localization and activity of cathepsin X in hemi-parkinsonian rats with 6-hydroxydopamine (6-OHDA)-induced excitotoxicity in the unilateral medial forebrain bundle (MFB) lesion. We report for the first time that cathepsin X expression and activity are rapidly increased in the ipsilateral SNc after injection of 6-OHDA into the MFB reaching a maximum after 12 h but seem to stay strongly upregulated after 4 weeks after injection. At early time points of 6-OHDA injection into the MFB, the increased cathepsin X is localized in the lysosomes in the neuronal, predominantly tyrosine hydroxylase-positive dopaminergic cells. After 12 h of 6-OHDA induced lesion, only a few activated microglial cells are positive for cathepsin X whereas, in 4 weeks post-lesion accompanied with complete loss of dopaminergic neurons, there is persistent cathepsin X upregulation restricted to activated glia cells. Taken together, our results demonstrate that cathepsin X upregulation in the lesioned dopaminergic system may play a role as a pathogenic factor in PD. Moreover, inhibition of cathepsin X expression or activity may be useful in protecting the nigrostriatal dopaminergic projection in the PD.
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Affiliation(s)
- Anja Pišlar
- Department of Pharmaceutical Biology, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - Larisa Tratnjek
- Institute of Pathophysiology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Gordana Glavan
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Marko Živin
- Institute of Pathophysiology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Janko Kos
- Department of Pharmaceutical Biology, Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia.,Department of Biotechnology, Jožef Stefan Institute, Ljubljana, Slovenia
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Haque A, Polcyn R, Matzelle D, Banik NL. New Insights into the Role of Neuron-Specific Enolase in Neuro-Inflammation, Neurodegeneration, and Neuroprotection. Brain Sci 2018; 8:E33. [PMID: 29463007 PMCID: PMC5836052 DOI: 10.3390/brainsci8020033] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 02/12/2018] [Accepted: 02/13/2018] [Indexed: 01/18/2023] Open
Abstract
Neurodegeneration is a complex process that leads to irreversible neuronal damage and death in spinal cord injury (SCI) and various neurodegenerative diseases, which are serious, debilitating conditions. Despite exhaustive research, the cause of neuronal damage in these degenerative disorders is not completely understood. Elevation of cell surface α-enolase activates various inflammatory pathways, including the production of pro-inflammatory cytokines, chemokines, and some growth factors that are detrimental to neuronal cells. While α-enolase is present in all neurological tissues, it can also be converted to neuron specific enolase (NSE). NSE is a glycolytic enzyme found in neuronal and neuroendocrine tissues that may play a dual role in promoting both neuroinflammation and neuroprotection in SCI and other neurodegenerative events. Elevated NSE can promote ECM degradation, inflammatory glial cell proliferation, and actin remodeling, thereby affecting migration of activated macrophages and microglia to the injury site and promoting neuronal cell death. Thus, NSE could be a reliable, quantitative, and specific marker of neuronal injury. Depending on the injury, disease, and microenvironment, NSE may also show neurotrophic function as it controls neuronal survival, differentiation, and neurite regeneration via activation of phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK) signaling pathways. This review discusses possible implications of NSE expression and activity in neuroinflammation, neurodegeneration, and neuroprotection in SCI and various neurodegenerative diseases for prognostic and therapeutic potential.
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Affiliation(s)
- Azizul Haque
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC 29401, USA.
| | - Rachel Polcyn
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC 29401, USA.
| | - Denise Matzelle
- Department of Neurosurgery, Medical University of South Carolina, Charleston, SC 29401, USA.
- Ralph H. Johnson Veterans Administration Medical Center, Charleston, SC 29401, USA.
| | - Naren L Banik
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC 29401, USA.
- Department of Neurosurgery, Medical University of South Carolina, Charleston, SC 29401, USA.
- Ralph H. Johnson Veterans Administration Medical Center, Charleston, SC 29401, USA.
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Kopitar AN, Skvarc M, Tepes B, Kos J, Ihan A. Helicobacter pylori susceptible/resistant to antibiotic eradication therapy differ in the maturation and activation of dendritic cells. Helicobacter 2013; 18:444-53. [PMID: 23859622 DOI: 10.1111/hel.12068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND The natural course of Helicobacter pylori infection, as well as the success of antibiotic eradication is determined by the immune response to bacteria. The aim of the study is to investigate how different Helicobacter pylori isolates influence the dendritic cells maturation and antigen-presenting function in order to elucidate the differences between Helicobacter pylori strains, isolated from the patients with successful antibiotic eradication therapy or repeated eradication failure. MATERIALS AND METHODS Dendritic cells maturation and antigen presentation were monitored by flow cytometry analysis of the major histocompatibility complex class II (MHC-II), Toll-like receptor (TLR) and costimulatory molecules expression, and by determining cytokine secretion. RESULTS Dendritic cells stimulated with Helicobacter pylori isolated from patients with repeated antibiotic eradication failure expressed less human leukocyte antigen (HLA-DR), CD86, TLR-2, and interleukin-8 (IL-8) compared to Helicobacter pylori strains susceptible to antibiotic therapy; the latter expressed lower production of IL-10. Polymyxin B inhibition of lipopolysaccharide reduces IL-8 secretion in the group of Helicobacter pylori strains susceptible to antibiotic therapy. The differences in IL-8 secretion between both groups are lipopolysaccharide dependent, while the differences in secretion of IL-10 remain unchanged after lipopolysaccharide inhibition. Inhibitor of cathepsin X Mab 2F12 reduced the secretion of IL-6, and the secretion was significantly lower in the group of Helicobacter pylori strains isolated from patients with repeated antibiotic eradication failure. CONCLUSION Helicobacter pylori strains, susceptible/resistant to antibiotic eradication therapy, differ in their capability to induce DCs maturation and antigen-presenting function.
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Affiliation(s)
- Andreja N Kopitar
- Medical Faculty Ljubljana, Institute of Microbiology and Immunology, University of Ljubljana, Ljubljana, Slovenia
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Hafner A, Glavan G, Obermajer N, Živin M, Schliebs R, Kos J. Neuroprotective role of γ-enolase in microglia in a mouse model of Alzheimer's disease is regulated by cathepsin X. Aging Cell 2013; 12:604-14. [PMID: 23621429 DOI: 10.1111/acel.12093] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2013] [Indexed: 12/20/2022] Open
Abstract
γ-Enolase is a neurotrophic-like factor promoting growth, differentiation, survival and regeneration of neurons. Its neurotrophic activity is regulated by cysteine protease cathepsin X which cleaves the C-terminal end of the molecule. We have investigated the expression and colocalization of γ-enolase and cathepsin X in brains of Tg2576 mice overexpressing amyloid precursor protein. In situ hybridization of γ-enolase and cathepsin X revealed that mRNAs for both enzymes were expressed abundantly around amyloid plaques. Immunostaining demonstrated that the C-terminally cleaved form of γ-enolase was present in the immediate plaque vicinity, whereas the intact form, exhibiting neurotrophic activity, was observed in microglia cells in close proximity to senile plaque. The upregulation of γ-enolase in microglial cells in response to amyloid-β peptide (Aβ) was confirmed in mouse microglial cell line EOC 13.31 and primary microglia and medium enriched with γ-enolase proved to be neuroprotective against Aβ toxicity; however, the effect was reversed by cathepsin X proteolytic activity. These results demonstrate an upregulation of γ-enolase in microglia cells surrounding amyloid plaques in Tg2576 transgenic mice and demonstrate its neuroprotective role in amyloid-β-related neurodegeneration.
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Affiliation(s)
- Anja Hafner
- Department of Pharmaceutical Biology Faculty of Pharmacy University of Ljubljana Askerceva 7Ljubljana 1000Slovenia
| | - Gordana Glavan
- Institute of Pathophysiology Medical faculty University of Ljubljana Zaloska 4Ljubljana 1000Slovenia
- Department of Biology Biotechnical faculty University of Ljubljana Vecna pot 11Ljubljana 1000Slovenia
| | - Nataša Obermajer
- Department of Pharmaceutical Biology Faculty of Pharmacy University of Ljubljana Askerceva 7Ljubljana 1000Slovenia
- Department of Biotechnology Jožef Stefan Institute Jamova 39Ljubljana 1000Slovenia
| | - Marko Živin
- Institute of Pathophysiology Medical faculty University of Ljubljana Zaloska 4Ljubljana 1000Slovenia
| | - Reinhard Schliebs
- Department of Neurochemistry Paul Flechsig Institute for Brain Research University of Leipzig Jahnallee 59Leipzig 04109Germany
| | - Janko Kos
- Department of Pharmaceutical Biology Faculty of Pharmacy University of Ljubljana Askerceva 7Ljubljana 1000Slovenia
- Department of Biotechnology Jožef Stefan Institute Jamova 39Ljubljana 1000Slovenia
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Skvarc M, Stubljar D, Kopitar AN, Jeverica S, Tepes B, Kos J, Ihan A. Inhibition of cathepsin X enzyme influences the immune response of THP-1 cells and dendritic cells infected with Helicobacter pylori. Radiol Oncol 2013; 47:258-65. [PMID: 24133391 DOI: 10.2478/raon-2013-0043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Accepted: 05/11/2013] [Indexed: 12/30/2022] Open
Abstract
Background The immune response to Helicobacter pylori importantly determines the outcome of infection as well as the success of eradication therapy. We demonstrate the role of a cysteine protease cathepsin X in the immune response to H. pylori infection. Materials and methods We analysed how the inhibition of cathepsin X influenced the immune response in experiments when THP-1 cells or dendritic cells isolated from patients were stimulated with 48 strains of H. pylori isolated from gastric biopsy samples of patients which had problems with the eradication of bacteria. Results The experiments, performed with the help of a flow cytometer, showed that the expression of Toll-like receptors (TLRs), especially TLR-4 molecules, on the membranes of THP-1 cells or dendritic cells was higher when we stimulated cells with H. pylori together with inhibitor of cathepsin X 2F12 compared to THP-1 cells or dendritic cells stimulated with H. pylori only, and also in comparison with negative control samples. We also demonstrated that when we inhibited the action of cathepsin X in THP-1 cells, the concentrations of pro-inflammatory cytokines were lower than when THP-1 cell were stimulated with H. pylori only. Conclusions We demonstrated that inhibition of cathepsin X influences the internalization of TLR-2 and TLR-4. TLR-2 and TLR-4 redistribution to intra-cytoplasmic compartments is hampered if cathepsin X is blocked. The beginning of a successful immune response against H. pylori in the case of inhibition of cathepsin X is delayed.
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Vizin T, Christensen IJ, Nielsen HJ, Kos J. Cathepsin X in serum from patients with colorectal cancer: relation to prognosis. Radiol Oncol 2012; 46:207-12. [PMID: 23077459 DOI: 10.2478/v10019-012-0040-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Accepted: 06/06/2012] [Indexed: 12/27/2022] Open
Abstract
Background Up-regulation of lysosomal cysteine protease cathepsin X (Cat X) is associated with disorders of the immune system and neurodegenerative diseases, while its role in the development and progression of cancer is less understood. Enhanced secretion of pro-Cat X was observed in malignant processes, and therefore, the level of total serum Cat X rather than the active enzyme may better reflect the tumour status. Patients and methods Seventy-seven patients with colorectal cancer (CRC) were included in a retrospective study. Blood samples were collected prior to therapy. Using ELISA, the values of total Cat X were measured in serum. Groups of healthy persons (n=77), patients with adenomas (n=77) and patients with non-neoplastic findings (n=77) were included. Results Significant differences between the group of colorectal patients and the groups of healthy persons, adenoma patients and patients with non-malignant findings could not be shown (p=0.89). Within the group of CRC, higher levels of total Cat X significantly correlated to shorter overall survival (HR=2.08, 95% CI:1.07–4.05, p=0.028). Conclusions Total serum Cat X could be a useful prognostic indicator for determining survival of patients with CRC. Increased serum levels of total Cat X may reflect more aggressive tumour cell phenotypes and suggest the involvement of Cat X in processes involved in later stages of tumour progression.
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