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Bokil AA, Le Boulvais Børkja M, Wolowczyk C, Lamsal A, Prestvik WS, Nonstad U, Pettersen K, Andersen SB, Bofin AM, Bjørkøy G, Hak S, Giambelluca MS. Discovery of a new marker to identify myeloid cells associated with metastatic breast tumours. Cancer Cell Int 2023; 23:279. [PMID: 37980483 PMCID: PMC10656772 DOI: 10.1186/s12935-023-03136-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 11/10/2023] [Indexed: 11/20/2023] Open
Abstract
BACKGROUND Myeloid cells play an essential role in cancer metastasis. The phenotypic diversity of these cells during cancer development has attracted great interest; however, their functional heterogeneity and plasticity have limited their role as prognostic markers and therapeutic targets. METHODS To identify markers associated with myeloid cells in metastatic tumours, we compared transcriptomic data from immune cells sorted from metastatic and non-metastatic mammary tumours grown in BALB/cJ mice. To assess the translational relevance of our in vivo findings, we assessed human breast cancer biopsies and evaluated the association between arginase 1 protein expression in breast cancer tissues with tumour characteristics and patient outcomes. RESULTS Among the differentially expressed genes, arginase 1 (ARG1) showed a unique expression pattern in tumour-infiltrating myeloid cells that correlated with the metastatic capacity of the tumour. Even though ARG1-positive cells were found almost exclusively inside the metastatic tumour, ARG1 protein was also present in the plasma. In human breast cancer biopsies, the presence of ARG1-positive cells was strongly correlated with high-grade proliferating tumours, poor prognosis, and low survival. CONCLUSION Our findings highlight the potential use of ARG1-positive myeloid cells as an independent prognostic marker to evaluate the risk of metastasis in breast cancer patients.
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Affiliation(s)
- Ansooya A Bokil
- Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Mathieu Le Boulvais Børkja
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Camilla Wolowczyk
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Apsana Lamsal
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Wenche S Prestvik
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Unni Nonstad
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kristine Pettersen
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Sonja B Andersen
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Anna M Bofin
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Geir Bjørkøy
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Sjoerd Hak
- Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biotechnology and Nanomedicine, SINTEF, Trondheim, Norway
| | - Miriam S Giambelluca
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
- Department of Clinical Medicine, Faculty of Health Science, UiT- The Arctic University of Norway, Tromsø, Norway.
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Børkja MLB, Giambelluca MS, Ytterhus B, Prestvik WS, Bjørkøy G, Bofin AM. S100A8 gene copy number and protein expression in breast cancer: associations with proliferation, histopathological grade and molecular subtypes. Breast Cancer Res Treat 2023:10.1007/s10549-023-07019-6. [PMID: 37450087 PMCID: PMC10361851 DOI: 10.1007/s10549-023-07019-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 06/20/2023] [Indexed: 07/18/2023]
Abstract
BACKGROUND AND AIMS Amplification of S100A8 occurs in 10-30% of all breast cancers and has been linked to poorer prognosis. Similarly, the protein S100A8 is overexpressed in a roughly comparable proportion of breast cancers and is also found in infiltrating myeloid-lineage cells, again linked to poorer prognosis. We explore the relationship between these findings. METHODS We examined S100A8 copy number (CN) alterations using fluorescence in situ hybridization in 475 primary breast cancers and 117 corresponding lymph nodes. In addition, we studied S100A8 protein expression using immunohistochemistry in 498 primary breast cancers from the same cohort. RESULTS We found increased S100A8 CN (≥ 4) in tumor epithelial cells in 20% of the tumors, increased S100A8 protein expression in 15%, and ≥ 10 infiltrating S100A8 + polymorphonuclear cells in 19%. Both increased S100A8 CN and protein expression in cancer cells were associated with high Ki67 status, high mitotic count and high histopathological grade. We observed no association between increased S100A8 CN and S100A8 protein expression, and only a weak association (p = 0.09) between increased CN and number of infiltrating S100A8 + immune cells. Only S100A8 protein expression in cancer cells was associated with significantly worse prognosis. CONCLUSIONS Amplification of S100A8 does not appear to be associated with S100A8 protein expression in breast cancer. S100A8 protein expression in tumor epithelial cells identifies a subgroup of predominantly non-luminal tumors with a high mean age at diagnosis and significantly worse prognosis. Finally, S100A8 alone is not a sufficient marker to identify infiltrating immune cells linked to worse prognosis.
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Affiliation(s)
- Mathieu Le Boulvais Børkja
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
| | - Miriam S Giambelluca
- Department of Clinical Medicine, Faculty of Health Science, UiT- The Arctic University of Norway, Tromsø, Norway
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Borgny Ytterhus
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Wenche S Prestvik
- Department of Biomedical Laboraxtory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Geir Bjørkøy
- Centre of Molecular Inflammation Research (CEMIR), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Biomedical Laboraxtory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
- Science Centre Nordland, Midtre gate 1, Mo i Rana, 8624, Norway
| | - Anna M Bofin
- Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
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Lamsal A, Andersen SB, Johansson I, Vietri M, Bokil AA, Kurganovs NJ, Rylander F, Bjørkøy G, Pettersen K, Giambelluca MS. Opposite and dynamic regulation of the interferon response in metastatic and non-metastatic breast cancer. Cell Commun Signal 2023; 21:50. [PMID: 36882786 PMCID: PMC9990226 DOI: 10.1186/s12964-023-01062-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 01/30/2023] [Indexed: 03/09/2023] Open
Abstract
BACKGROUND To our current understanding, solid tumors depend on suppressed local immune reactions, often elicited by the interaction between tumor cells and tumor microenvironment (TME) components. Despite an improved understanding of anti-cancer immune responses in the TME, it is still unclear how immuno-suppressive TME are formed and how some cancer cells survive and metastasize. METHODS To identify the major adaptations that cancer cells undergo during tumor development and progression, we compared the transcriptome and proteome from metastatic 66cl4 and non-metastatic 67NR cell lines in culture versus their corresponding mouse mammary primary tumors. Using confocal microscopy, RT-qPCR, flow cytometry and western blotting, we studied the signaling pathway and the mechanisms involved. In addition, we used public gene expression data from human breast cancer biopsies to evaluate the correlation between gene expression and clinical outcomes in patients. RESULTS We found that type I interferon (IFN-I) response was a key differentially regulated pathway between metastatic and non-metastatic cell lines and tumors. The IFN-I response was active in metastatic cancer cells in culture and markedly dampened when these cells formed primary tumors. Interestingly, the opposite was observed in non-metastatic cancer cells and tumors. Consistent with an active IFN-I response in culture, the metastatic cancer cells displayed elevated levels of cytosolic DNA from both mitochondria and ruptured micronuclei with concomitant activation of cGAS-STING signaling. Interestingly, decreased IFN-I-related gene expression in breast cancer biopsies correlated with an unfavourable prognosis in patients. CONCLUSION Our findings show that IFN-I response is dampened in the tumors with the metastatic ability and lower IFN-I expression predicts poor prognosis in triple-negative and HER2 enriched breast cancer patients. This study highlights the possibility of reactivating the IFN-I response as a potential therapeutic strategy in breast cancer. Video Abstract.
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Affiliation(s)
- Apsana Lamsal
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway.,Centre of Molecular Inflammation Research and Department of Cancer Research and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Sonja Benedikte Andersen
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway.,Centre of Molecular Inflammation Research and Department of Cancer Research and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Ida Johansson
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Marina Vietri
- Centre for Cancer Cell Reprogramming, Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Montebello, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway
| | - Ansooya Avinash Bokil
- Centre of Molecular Inflammation Research and Department of Cancer Research and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.,Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Natalie Jayne Kurganovs
- Institute for Cancer Research, Department of Tumor Biology, Oslo University Hospital, Montebello, Oslo, Norway
| | - Felicia Rylander
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Geir Bjørkøy
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway.,Centre of Molecular Inflammation Research and Department of Cancer Research and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kristine Pettersen
- Department of Biomedical Laboratory Science, Faculty of Natural Sciences, Norwegian University of Science and Technology, Trondheim, Norway. .,Centre of Molecular Inflammation Research and Department of Cancer Research and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
| | - Miriam S Giambelluca
- Centre of Molecular Inflammation Research and Department of Cancer Research and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway. .,Department of Clinical Medicine, Faculty of Health Science, UiT-The Arctic University of Norway, Tromsø, Norway.
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Pinto SM, Kim H, Subbannayya Y, Giambelluca MS, Bösl K, Ryan L, Sharma A, Kandasamy RK. Comparative Proteomic Analysis Reveals Varying Impact on Immune Responses in Phorbol 12-Myristate-13-Acetate-Mediated THP-1 Monocyte-to-Macrophage Differentiation. Front Immunol 2021; 12:679458. [PMID: 34234780 PMCID: PMC8255674 DOI: 10.3389/fimmu.2021.679458] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 03/19/2021] [Accepted: 05/25/2021] [Indexed: 01/06/2023] Open
Abstract
Macrophages are sentinels of the innate immune system, and the human monocytic cell line THP-1 is one of the widely used in vitro models to study inflammatory processes and immune responses. Several monocyte-to-macrophage differentiation protocols exist, with phorbol 12-myristate-13-acetate (PMA) being the most commonly used and accepted method. However, the concentrations and duration of PMA treatment vary widely in the published literature and could affect the probed phenotype, however their effect on protein expression is not fully deciphered. In this study, we employed a dimethyl labeling-based quantitative proteomics approach to determine the changes in the protein repertoire of macrophage-like cells differentiated from THP-1 monocytes by three commonly used PMA-based differentiation protocols. Employing an integrated network analysis, we show that variations in PMA concentration and duration of rest post-stimulation result in downstream differences in the protein expression and cellular signaling processes. We demonstrate that these differences result in altered inflammatory responses, including variation in the expression of cytokines upon stimulation with various Toll-like receptor (TLR) agonists. Together, these findings provide a valuable resource that significantly expands the knowledge of protein expression dynamics with one of the most common in vitro models for macrophages, which in turn has a profound impact on the immune as well as inflammatory responses being studied.
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Affiliation(s)
- Sneha M. Pinto
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
- Center for Systems Biology and Molecular Medicine, Yenepoya (Deemed to be University), Mangalore, India
| | - Hera Kim
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
| | - Yashwanth Subbannayya
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
| | - Miriam S. Giambelluca
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
| | - Korbinian Bösl
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
- Department of Infectious Diseases, Medical Clinic, St. Olavs Hospital, Trondheim, Norway
| | - Liv Ryan
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
| | - Animesh Sharma
- Proteomics and Modomics Experimental Core, PROMEC, Norwegian University of Science and Technology and the Central Norway Regional Health Authority, Stjørdal, Norway
| | - Richard K. Kandasamy
- Centre of Molecular Inflammation Research (CEMIR), and Department of Clinical and Molecular Medicine (IKOM), Norwegian University of Science and Technology, Trondheim, Norway
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Giambelluca MS, Pouliot M. Early tyrosine phosphorylation events following adenosine A 2A receptor in human neutrophils: identification of regulated pathways. J Leukoc Biol 2017; 102:829-836. [PMID: 28179537 DOI: 10.1189/jlb.2vma1216-517r] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 01/16/2017] [Accepted: 01/23/2017] [Indexed: 12/30/2022] Open
Abstract
Activation of the adenosine 2A receptor (A2AR) elevates intracellular levels of cAMP and acts as a physiologic inhibitor of inflammatory neutrophil functions. In this study, we looked into the impact of A2AR engagement on early phosphorylation events. Neutrophils were stimulated with well-characterized proinflammatory agonists in the absence or presence of an A2AR agonist {3-[4-[2-[ [6-amino-9-[(2R,3R,4S,5S)-5-(ethylcarbamoyl)-3,4-dihydroxy-oxolan-2-yl]purin-2-yl]amino] ethyl] phenyl] propanoic acid (CGS 21680)}, PGE2, or a mixture of the compounds RO 20-1724 and forskolin. As assessed by immunoblotting, several proteins were tyrosine phosphorylated; CGS 21680 markedly decreased tyrosine phosphorylation levels of 4 regions (37-45, 50-55, 60, and 70 kDa). Key signaling protein kinases-p38 MAPK, Erk-1/2, PI3K/Akt, Hck, and Syk-showed decreased phosphorylation, whereas Lyn, SHIP-1, or phosphatase and tensin homolog (PTEN) was spared. PGE2 or the intracellular cAMP-elevating combination of RO 20-1724 and forskolin mostly mimicked the effect of CGS 21680. Together, results unveil intracellular signaling pathways targeted by the A2AR, some of which might be key in modulating neutrophil functions.
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Affiliation(s)
- Miriam S Giambelluca
- Department of Microbiology, Infectious Diseases and Immunology, Faculty of Medicine, Centre de Recherche du CHU de Québec-Université Laval, Quebec City, Canada
| | - Marc Pouliot
- Department of Microbiology, Infectious Diseases and Immunology, Faculty of Medicine, Centre de Recherche du CHU de Québec-Université Laval, Quebec City, Canada
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Giambelluca MS, Bertheau‐Mailhot G, Laflamme C, Rollet‐Labelle E, Servant MJ, Pouliot M. TNF‐α expression in neutrophils and its regulation by glycogen synthase kinase‐3: A potentiating role for lithium. FASEB J 2014; 28:3679-90. [DOI: 10.1096/fj.14-251900] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Miriam S. Giambelluca
- Centre de Recherche du Centre Hospitalier Universitaire de QuébecQuebec CityQuebecCanada
- Faculty of MedicineUniversité LavalQuebec CityQuebecCanada
| | - Geneviève Bertheau‐Mailhot
- Centre de Recherche du Centre Hospitalier Universitaire de QuébecQuebec CityQuebecCanada
- Faculty of MedicineUniversité LavalQuebec CityQuebecCanada
| | - Cynthia Laflamme
- Centre de Recherche du Centre Hospitalier Universitaire de QuébecQuebec CityQuebecCanada
- Faculty of MedicineUniversité LavalQuebec CityQuebecCanada
| | - Emmanuelle Rollet‐Labelle
- Centre de Recherche du Centre Hospitalier Universitaire de QuébecQuebec CityQuebecCanada
- Faculty of MedicineUniversité LavalQuebec CityQuebecCanada
| | - Marc J. Servant
- Faculty of PharmacyUniversité de MontréalMontréalQuebecCanada
| | - Marc Pouliot
- Centre de Recherche du Centre Hospitalier Universitaire de QuébecQuebec CityQuebecCanada
- Faculty of MedicineUniversité LavalQuebec CityQuebecCanada
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Giambelluca MS, Ciancio MC, Orlowski A, Gende OA, Pouliot M, Aiello EA. Characterization of the Na/HCO3(-) cotransport in human neutrophils. Cell Physiol Biochem 2014; 33:982-90. [PMID: 24714077 DOI: 10.1159/000358669] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/10/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Bicarbonate transport has crucial roles in regulating intracellular pH (pHi) in a variety of cells. The purpose of this study was to evaluate its participation in the regulation of pHi in resting and stimulated human neutrophils. METHODS Freshly isolated human neutrophils acidified by an ammonium prepulse were used in this study. RESULTS We demonstrated that resting neutrophils have a bicarbonate transport mechanism that prevents acidification when the Na(+)/H(+) exchanger is blocked by EIPA. Neutrophils acidified by an ammonium prepulse showed an EIPA-resistant recovery of pHi that was inhibited by the blocker of the anionic transporters SITS or the Na(+)/HCO3(-) cotransporter (NBC) selective inhibitor S0859, and abolished when sodium was removed from the extracellular medium. In western blot and RT-PCR analysis the expression of NBCe2 but not NBCe1 or NBCn1 was detected in neutrophils Acidified neutrophils increased the EIPA-insensitive pHi recovery rate when its activity was stimulated with fMLF/ cytochalasin B. This increase in the removal of acid equivalents was insensitive to the blockade of the NADPH oxidase with DPI. CONCLUSION It is concluded that neutrophils have an NBC that regulates basal pHi and is modulated by chemotactic agents.
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Affiliation(s)
- Miriam S Giambelluca
- Centro de Investigaciones Cardiovasculares, CCT La Plata, CONICET. Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
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Laflamme C, Bertheau-Mailhot G, Giambelluca MS, Cloutier N, Boilard E, Pouliot M. Evidence of impairment of normal inflammatory reaction by a high-fat diet. Genes Immun 2014; 15:224-32. [DOI: 10.1038/gene.2014.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 01/14/2014] [Accepted: 01/21/2014] [Indexed: 01/18/2023]
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Giambelluca MS, Rollet-Labelle E, Bertheau-Mailhot G, Laflamme C, Pouliot M. Post-transcriptional regulation of tumour necrosis factor alpha biosynthesis: Relevance to the pathophysiology of rheumatoid arthritis. ACTA ACUST UNITED AC 2013. [DOI: 10.13172/2052-787x-1-1-477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Giambelluca MS, Gende OA. Cl⁻/HCO₃⁻ exchange activity in fMLP-stimulated human neutrophils. Biochem Biophys Res Commun 2011; 409:567-71. [PMID: 21605548 DOI: 10.1016/j.bbrc.2011.05.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 05/08/2011] [Indexed: 01/11/2023]
Abstract
It is well known that chemotactic agents active Na(+)/H(+) exchanger, increasing intracellular pH of neutrophils, but their effect on bicarbonate transporters have not been established yet. To study the effect of fMLP on the activity of Cl(-)/HCO(3)(-) exchange, the rate of pH recovery after acute Cl(-) readmission in cell subjected to an alkaline load by CO(2) washout in a Cl-free medium was measured. The activity of the exchanger was reduced to 72% of control when cells were pre-incubated for 5 min with 0.1 μM fMLP and reached 48% of control in steady state after acute exposure. After extracellular bicarbonate or TMA addition the rate recovery of intracellular pH was reduce at 72% and at 84%, respectively. The inhibitory effect on the intracellular pH recovery was not affected by blockers of Na(+)/H(+) exchange. We conclude from these studies that an increase of pH(i) produced for this chemotactic agent is facilitated by the simultaneous activation of Na(+)/H(+) exchange and inhibition of Cl(-)/HCO(3)(-) exchange in neutrophils.
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Affiliation(s)
- Miriam S Giambelluca
- Centro de Investigaciones Cardiovasculares, CCT La Plata, CONICET, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, 1900 La Plata, Argentina.
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Abstract
In treatment of hemorrhagic shock, small-volume infusion of 7.5% NaCl gives immediate hemodynamic improvement, but in vitro experiments suggest it depresses the hemostatic system. Since previous reports showed that hyperosmotic glycine solutions preserved the platelet function better than hyperosmotic NaCl solutions, we investigated whether glycine changes the intracellular calcium ([Ca]i) signal. Platelets were incubated in hyperosmotic solutions containing sodium glycine or glycine base and stimulated with 0.1 IU/ml thrombin. [Ca]i increases were compared with an isosmotic control. Platelets incubated in zero calcium/EGTA were used to study separately the effect of glycine on calcium mobilization from intracellular stores and extracellular calcium entry. When NaCl was replaced by sodium glycine, the [Ca]i increase produced by thrombin was enhanced, because the calcium entry increased without changes in the mobilization of stored calcium. The addition of 50 mmol/l glycine base to the HEPES-buffered media increases the thrombin-induced entry of calcium or manganese. This study demonstrates that hyperosmotic glycine solutions increase the entry of calcium. This effect contrasts with the impairment of the thrombin-induced calcium signals by NaCl. The addition of low amounts of glycine in resuscitation solutions would be useful to reduce dysfunctional inflammatory responses without the risk of bleeding; however, concentrated solutions could cause toxic effects.
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Affiliation(s)
- Miriam S Giambelluca
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120, 1900 La Plata, Argentina
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Giambelluca MS, Gende OA. Selective inhibition of calcium influx by 2-aminoethoxydiphenyl borate. Eur J Pharmacol 2007; 565:1-6. [PMID: 17391665 DOI: 10.1016/j.ejphar.2007.02.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Revised: 02/07/2007] [Accepted: 02/08/2007] [Indexed: 10/23/2022]
Abstract
2-aminoethoxydiphenyl borate (2APB) blocks agonist-induced Ca2+ mobilization from intracellular stores and Ca2+ entry. To compare the sensitivity profiles of these two components of calcium signaling, human platelets were exposed to different concentrations of 2APB. The drug interferes with the Ca2+ mobilization from intracellular stores induced by thrombin with an IC50 of 52+/-2 microM but it has a more potent inhibitory effect on the Ca2+ entry (IC50=16+/-1 microM). This value was similar to the IC50 found when the immediate inhibition of the calcium entry was studied after Ca2+ mobilization was completed (IC50=18+/-5 microM). The calcium influx induced by thapsigargin showed an IC50 of 17+/-1 microM for the immediate inhibition. The sensitivity to bivalent ion entry to 2APB was confirmed by Mn2+ entry inhibition. Although the specificity of 2APB with respect to the intracellular signaling system has not been fully established, our results confirm that the direct inhibition of calcium entry through the store-operated channels requires lower concentrations than the inhibition of mobilization, suggesting an independent and different site of action.
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Affiliation(s)
- Miriam S Giambelluca
- Centro de Investigaciones Cardiovasculares, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
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