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Andriana P, Lijenback H, Iqbal I, Palani S, Makrypidi K, Virta J, Herre EA, Jalkanen S, Knuuti J, Pirmettis I, Li XG, Saraste A, Roivainen A. Exploring macrophage mannose receptor expression after myocardial infarction by Al[18F]F-NOTA-DCM positron emission tomography. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Mannose receptor (CD206) is primarily expressed on the surface of alternatively activated macrophages that are involved in resolution of inflammation after myocardial injury [1]. The purpose of this study was to evaluate mannose receptor targeting positron emission tomography (PET) tracer Al[18F]F-NOTA-DCM consisting of dextran backbone with cysteine-mannose moieties for imaging of experimental acute myocardial infarction (MI) [2].
Methods
First, ALEXA-488 fluorophore-labelled DCM was used for specificity studies using flow cytometry of M1 and M2 polarized macrophages derived from human blood monocytes. Secondly, Sprague-Dawley rats were studied on day 3 and day 7 after permanent ligation of left coronary artery or after sham-operation. [18F]FDG PET (35 MBq, 10 min static scan) was performed to visualize myocardium and on the next day, 60 min dynamic PET was performed after injection of 50 MBq of Al[18F]F-NOTA-DCM. Then, rats were euthanized for biodistribution study by gamma counting followed by digital autoradiography and histology (H&E, CD206 staining) of left ventricle cryosections. In vitro Al[18F]F-NOTA-DCM blocking study was performed on left ventricle cryosection with molar excess of unlabelled DCM.
Results
Flow cytometry confirmed that ALEXA-488-DCM bound specifically to M2 macrophages. In rats, the infarcted area was clearly detected in vivo with Al[18F]F-NOTA-DCM PET and its SUV was significantly higher than that of remote area or myocardium of sham-operated rats both on day 3 (SUV 0.78±0.18 vs. 0.47±0.13 vs. 0.43±0.07, p<0.005) and day 7 post-MI (SUV 0.64±0.10 vs. 0.47±0.12 vs. 0.51±0.07, p<0.05). Autoradiography confirmed increased uptake in the infarcted area compared to the remote area or to the myocardium of sham-operated rats on day 3 (PSL/mm2 141.21±46.06 vs. 49.76±20.37 vs. 57.97±6.77, p<0.005) and day 7 (PSL/mm2 139.22±19.44 vs. 55.38±28.83 vs. 60.83±7.63, p<0.0001). In vitro blocking study indicated that the tracer binding in infarcted area was specific. The area-% of CD206-positive staining in the infarcted area was significantly higher on day 3 post-MI than on day 7 (p<0.05), and higher at both time points than in remote area or myocardium of sham-operated rats (p<0.0001). Area-% of CD206 staining in the MI area positively correlated with Al[18F]F-NOTA-DCM uptake and MI size (p<0.05 and p<0.01, respectively).
Conclusions
Al[18F]F-NOTA-DCM PET detects overexpression of mannose receptor after ischemic myocardial injury and may be a suitable biomarker for early detection of the inflammation resolution process after MI.
Funding Acknowledgement
Type of funding sources: Foundation. Main funding source(s): Jane and Aatos Erkko FoundationSigrid Juselius FoundationFInnish Foundation for Cardiovascular Research
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Affiliation(s)
- P Andriana
- University of Turku, Turku PET Centre , Turku , Finland
| | - H Lijenback
- University of Turku, Turku PET Centre, Turku Center for Disease Modeling , Turku , Finland
| | - I Iqbal
- University of Turku, Turku PET Centre , Turku , Finland
| | - S Palani
- University of Turku, Turku PET Centre , Turku , Finland
| | - K Makrypidi
- NCSR “Demokritos”, Institute of Nuclear and Radiological Science and Technology, Energy and Safety , Athens , Greece
| | - J Virta
- University of Turku, Turku PET Centre , Turku , Finland
| | - E A Herre
- University of Turku, Turku PET Centre , Turku , Finland
| | - S Jalkanen
- University of Turku, MediCity Research Laboratory, InFLAMES Research Flagship Center , Turku , Finland
| | - J Knuuti
- University of Turku, Turku PET Centre, InFLAMES Research Flagship Center, Turku University Hospital , Turku , Finland
| | - I Pirmettis
- NCSR “Demokritos”, Institute of Nuclear and Radiological Science and Technology, Energy and Safety , Athens , Greece
| | - X G Li
- University of Turku, Turku PET Centre, Department of Chemistry , Turku , Finland
| | - A Saraste
- University of Turku, Turku PET Centre, Heart Centre, Turku University Hospital and University of Turku , Turku , Finland
| | - A Roivainen
- University of Turku, Turku PET Centre, Turku Center for Disease Modeling, InFLAMES Research Flagship Center , Turku , Finland
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2
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Bono P, Minchom A, Shetty S, Ma Y, Cruz R, de Jonge M, Yap C, Pasanen A, Skytta T, Iivanainen S, Verlingue L, Jaakkola P, de Miguel M, Arora S, Graham D, Jalkanen S, Hollmen M, Mandelin J, Karvonen M, Kauko T, Koivunen J. LBA38 Bexmarilimab, a novel macrophage re-programmer shows promising anti-tumour activity in phase I/II trial in several last line solid tumour types. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.2115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Maaniitty E, Sinisilta S, Jalkanen J, Hollmen M, Biancari F, Gunn J, Jalkanen S, Airaksinen K, Kiviniemi T. Distinct circulating cytokine levels in patients with angiography-proven coronary artery disease compared to disease-free controls. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.1294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Systemic inflammation has a critical role in the development of coronary artery disease (CAD). Identification of inflammatory pathways may provide a platform for novel therapeutic approaches.
Purpose
We sought to determine whether there are differences in circulating cytokine profiles between patients with CAD and disease-free controls.
Methods
Study population consisted of 458 patients who underwent diagnostic invasive coronary angiography for clinical indications. Altogether 312 patients had angiographically significant CAD whereas 146 had no angiographically-detected coronary atherosclerosis. We measured the serum concentrations of 48 circulating cytokines.
Results
Patients with CAD had increased levels of interleukin-1 receptor antagonist (IL-1-RA), interleukin-2 receptor alpha (IL-2Rα), IL-3, IL-4, IL-6, IL-9, IL-10, IL-16, IL-17, IL-18, granulocyte-macrophage colony-stimulating factor (GM-CSF), platelet-derived growth factor-BB (PDGF-BB), macrophage inflammatory protein-1-beta (MIP-1-β), tumor necrosis factor-alpha (TNF-α), TNF-β, cutaneous T-cell-attracting chemokine (CTACK), growth regulated oncogene alpha (GRO-α), hepatocyte growth factor (HGF), interferon alpha-2 (IFNα-2), leukemia inhibitory factor (LIF), macrophage colony-stimulating factor (M-CSF), macrophage migration inhibitory factor (MIF), monokine induced by gamma interferon (MIG), beta-nerve growth factor (β-NGF), stem cell factor (SCF) and stromal cell-derived factor 1 alfa (SDF1α). On a logistic multivariate regression model adjusted with age, sex, hypertension and treatment for diabetes, increased levels of IL-4 (p=0.027, OR 1.090), IL-9 (p=0.000, OR 1.013), IL-17 (p=0.011, OR 1.005), CTACK (p=0.008, OR 1.001), MIP-1-β (p=0.004, OR 1.006), GRO-α (p=0.008, OR 1.004), TNF-α (p=0.019, OR 1.011) were independently associated with atherosclerosis.
Conclusions
Patients with CAD have distinct circulating cytokine profiles compared to disease-free controls. Based on these findings, certain cytokines may have a pivotal role in the development of atherosclerotic cardiovascular disease and cytokine-mediated pathway appear as a promising target for cardiovascular drug development.
Funding Acknowledgement
Type of funding source: Foundation. Main funding source(s): The Finnish Medical Foundation, Helsinki, Finland; The Finnish Foundation for Cardiovascular Research, Helsinki, Finland
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Affiliation(s)
| | | | - J Jalkanen
- Turku University Hospital, Turku, Finland
| | | | | | - J Gunn
- Turku University Hospital, Turku, Finland
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Bono P, Jaakkola P, Shetty S, Ma Y, de Jonge M, Robbrecht D, Minchom A, Pal A, Yap C, Pasanen A, Skytta T, Thibault A, Cruz R, Jalkanen M, Jalkanen S, Hollmén M, Mandelin J, Karvonen M, Koivunen J. 1024MO A phase I/II MATINS trial: Part 1 pharmacokinetic, safety and efficacy results of Clever-1 blockade in advanced cancer. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.1144] [Citation(s) in RCA: 1] [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] [Indexed: 10/23/2022] Open
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5
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Hollmén M, Virtakoivu R, Jaakkola P, Minchom A, Jalkanen S, Karvonen M, Mandelin J, Koivunen J, Bono P. Biomarkers of immune switch induced by a novel anti-macrophage antibody (anti-Clever-1 mAb; FP-1305) in MATINS trial patients with advanced solid tumours. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz447.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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6
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Bono P, Hollmen M, Jaakkola P, Shetty S, Thibault A, de Jonge M, Minchom A, Ma Y, Yap C, Robbrecht D, Pasanen A, Jalkanen S, Cruz R, Pal A, Karvonen M, Mandelin J, Koivunen J. Immune activation with a novel immune switch anti-macrophage antibody (anti-Clever-1 mAb; FP-1305) in phase I/II first-in-human MATINS trial in patients with advanced solid tumours. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz394.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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7
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Sinisilta S, Hollmen M, Gunn J, Ruohonen I, Jalkanen J, Airaksinen J, Jalkanen S, Kiviniemi T. P1656Circulating cytokines predict atrial fibrillation in patients undergoing open-heart coronary bypass. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Sinisilta
- Turku University Hospital, Heart Center, Turku, Finland
| | - M Hollmen
- University of Turku, MediCity Research Laboratory, Turku, Finland
| | - J Gunn
- Turku University Hospital, Heart Center, Turku, Finland
| | - I Ruohonen
- Turku University Hospital, Heart Center, Turku, Finland
| | - J Jalkanen
- University of Turku, MediCity Research Laboratory, Turku, Finland
| | - J Airaksinen
- Turku University Hospital, Heart Center, Turku, Finland
| | - S Jalkanen
- University of Turku, MediCity Research Laboratory, Turku, Finland
| | - T Kiviniemi
- Turku University Hospital, Heart Center, Turku, Finland
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Viikinkoski E, Hollmen M, Jalkanen J, Gunn J, Airaksinen J, Jalkanen S, Kiviniemi T. P1655Preoperative predictors for systemic inflammatory response in open-heart surgery. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- E Viikinkoski
- Heart Centre, Turku University Hospital and University of Turku, Finland, Turku, Finland
| | - M Hollmen
- Medicity Research Laboratory, Department of Microbiology and Immunology, University of Turku, Turku, Turku, Finland
| | - J Jalkanen
- Department of Vascular Surgery, Turku University and Turku University Hospital, Turku, Finland, Turku, Finland
| | - J Gunn
- Heart Centre, Turku University Hospital and University of Turku, Finland, Turku, Finland
| | - J Airaksinen
- Heart Centre, Turku University Hospital and University of Turku, Finland, Turku, Finland
| | - S Jalkanen
- Medicity Research Laboratory, Department of Microbiology and Immunology, University of Turku, Turku, Turku, Finland
| | - T Kiviniemi
- Heart Centre, Turku University Hospital and University of Turku, Finland, Turku, Finland
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Santalahti K, Havulinna A, Maksimow M, Zeller T, Blankenberg S, Vehtari A, Joensuu H, Jalkanen S, Salomaa V, Salmi M. Plasma levels of hepatocyte growth factor and placental growth factor predict mortality in a general population: a prospective cohort study. J Intern Med 2017; 282:340-352. [PMID: 28682476 DOI: 10.1111/joim.12648] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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: 12/13/2022]
Abstract
BACKGROUND Circulating levels of growth factors involved in leucocyte production and angiogenesis could be indicative of underlying aberrations of tissue homeostasis and therefore be utilized as predictors of risk for all-cause cardiovascular disease (CVD) or cancer mortality. METHODS Baseline plasma levels of a range of growth factors were measured in two cohorts of the population-based FINRISK study (1997 Discovery cohort, N = 8444, aged 25-74; 2002 Replication cohort, N = 2951, aged 51-74 years) using a multiplexed bead array methodology and ELISA. Participants were followed up by linking them to registry data. RESULTS In the Discovery cohort (653 deaths; 216 CVD-related, 231 cancer-related), fully adjusted Cox proportional hazard regression models showed that increased plasma hepatocyte growth factor (HGF) and placental growth factor (PlGF) were associated with higher risk of 10-year mortality (HR, 1.29 [95% confidence interval (CI), 1.18-1.41] and HR, 1.23 [95% CI, 1.14-1.32], respectively). In the Replication cohort (259 deaths; 83 CVD-related, 90 cancer-related), baseline HGF levels also predicted all-cause mortality (HR, 1.2 [95% CI, 1.08-1.32]; PlGF data not available). By including HGF levels in a CVD mortality model, 9% of all CVD deaths were correctly reclassified in the Discovery cohort (categorical net reclassification improvement [NRI] for events, P = 4.0 × 10-4 ). Moreover, adding HGF to all-cause and CVD mortality models resulted in an overall clinical NRI of 0.10-0.18 in the Discovery cohort and meta-analyses (P < 0.05 for all tests). CONCLUSION Blood levels of HGF and PlGF may serve as new biomarkers for predicting increased risk of death in the general population.
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Affiliation(s)
- K Santalahti
- MediCity Research Laboratory, University of Turku, Turku, Finland.,Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - A Havulinna
- Department of Public Health Solutions, National Institute for Health and Welfare, Helsinki, Finland
| | - M Maksimow
- MediCity Research Laboratory, University of Turku, Turku, Finland.,Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - T Zeller
- Clinic for General and Interventional Cardiology, University Heart Center Hamburg, Hamburg, Germany.,German Center for Cardiovascular Research (DZHK eV), Partner Site Hamburg/Lübeck/Kiel/Hamburg, Germany
| | - S Blankenberg
- Clinic for General and Interventional Cardiology, University Heart Center Hamburg, Hamburg, Germany.,German Center for Cardiovascular Research (DZHK eV), Partner Site Hamburg/Lübeck/Kiel/Hamburg, Germany
| | - A Vehtari
- Department of Biomedical Engineering and Computational Science, Aalto University, Espoo, Finland
| | - H Joensuu
- Department of Oncology, Helsinki University Hospital, Helsinki, Finland.,University of Helsinki, Helsinki, Finland
| | - S Jalkanen
- MediCity Research Laboratory, University of Turku, Turku, Finland.,Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - V Salomaa
- Department of Public Health Solutions, National Institute for Health and Welfare, Helsinki, Finland
| | - M Salmi
- MediCity Research Laboratory, University of Turku, Turku, Finland.,Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
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Chen DW, Jin Y, Zhao RM, Long LJ, Zhang J, Han CL, Roivainen A, Knuuti J, Jalkanen S, Wang JC. Age-, sex- and glucose-dependent correlation of plasma soluble vascular adhesion protein-1 concentration with cardiovascular risk factors and subclinical atherosclerosis. Eur Rev Med Pharmacol Sci 2016; 20:1544-1558. [PMID: 27160127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE Soluble vascular adhesion protein-1 (sVAP-1) may act as a biomarker for atherosclerosis and cardiovascular diseases. The associations of sVAP-1 concentration with cardiovascular risk factors and subclinical atherosclerosis at the population level have not been reported. PATIENTS AND METHODS This cross-sectional study included 834 asymptomatic subjects (49.1 ± 9.3 years). sVAP-1 was measured by enzyme-linked immunosorbent assay. Subclinical atherosclerosis was assessed by brachial-ankle pulse wave velocity (baPWV) and carotid intima-media thickness (CIMT). RESULTS sVAP-1 increased with age. Women had a higher concentration than men in age > 40 years. In women, sVAP-1 was negatively associated with estradiol (p < 0.01) and body mass index (BMI) (p < 0.05). In men, sVAP-1 was negatively associated with apolipoprotein A (ApoA) (p < 0.01), alcohol intake (p < 0.01) and uric acid (p < 0.05), but positively associated with ApoB/ApoA (p < 0.05). In hyperglycemia subjects, sVAP-1 positively correlated with fasting plasma glucose (p < 0.05) and hemoglobin A1c (p < 0.05), but in normoglycemic subjects, sVAP-1 negatively correlated with BMI (p < 0.01), triglyceride (p < 0.05), alcohol intake (p < 0.05). sVAP-1 independently influenced CIMT (β = 0.001, p = 0.040) and carotid plaques [odds ratio 1.380 (95% confidence interval 1.051-1.813, p = 0.021)] in hyperglycemia, and baPWV (β = 31.605, p = 0.014) in age > 55 years. CONCLUSIONS sVAP-1 concentration correlates with cardiovascular risk factors and subclinical atherosclerosis in an age-, sex- and glucose-dependent manner.
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Affiliation(s)
- D-W Chen
- Geriatric Institute, the General Hospital of the Air Force, PLA (the Chinese People's Liberation Army), Haidian District, Beijing, China.
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Bashandy H, Jalkanen S, Teeri TH. Within leaf variation is the largest source of variation in agroinfiltration of Nicotiana benthamiana. Plant Methods 2015; 11:47. [PMID: 26472987 PMCID: PMC4607171 DOI: 10.1186/s13007-015-0091-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Accepted: 10/07/2015] [Indexed: 05/20/2023]
Abstract
BACKGROUND Transient gene expression utilizing syringe agroinfiltration offers a simple and efficient technique for different transgenic applications. Leaves of Nicotiana benthamiana show reliable and high transformation efficiency, but in quantitative assays also a certain degree of variation. We used a nested design in our agroinfiltration experiments to dissect the sources of this variation. RESULTS An intron containing firefly luciferase gene was used as a reporter for agroinfiltration. A number of 6 week old tobacco plants were infiltrated for their top leaves, several samples were punched from the leaves after 2 days of transient expression, and protein extracts from the samples were repeatedly measured for luciferase activity. Interestingly, most of the variation was due to differences between the sampling spots in the leaves, the next important source being the different leaves on each plant. Variation between similar experiments, between plants and between repetitive measurements of the extracts could be easily minimized. CONCLUSIONS Efforts and expenditure of agroinfiltration experiments can be optimized when sources of variation are known. In summary, infiltrate more plants but less leaves, sample more positions on the leaf but run only few technical replicates.
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Affiliation(s)
- Hany Bashandy
- />Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland
- />Department of Genetics, Cairo University, 13 Gamaa St., Giza, 12619 Egypt
| | - Salla Jalkanen
- />Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland
| | - Teemu H. Teeri
- />Department of Agricultural Sciences, Viikki Plant Science Centre, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland
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12
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Jalkanen S. New molecules controlling endothelial barrier. Crit Care 2015. [PMCID: PMC4472830 DOI: 10.1186/cc14314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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13
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Jalkanen S. Severity markers in acute pancreatitis. Crit Care 2015. [PMCID: PMC4470908 DOI: 10.1186/cc14469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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14
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Mustjoki S, Auvinen K, Kreutzman A, Rousselot P, Hernesniemi S, Melo T, Lahesmaa-Korpinen AM, Hautaniemi S, Bouchet S, Molimard M, Smykla R, Lee FY, Vakkila J, Jalkanen S, Salmi M, Porkka K. Rapid mobilization of cytotoxic lymphocytes induced by dasatinib therapy. Leukemia 2012. [PMID: 23192016 DOI: 10.1038/leu.2012.348] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Tyrosine kinase inhibitors (TKIs) have potent effects on malignant cells, and they also target kinases in normal cells, which may have therapeutic implications. Using a collection of 55 leukemia patients treated with TKI therapy (chronic myeloid leukemia, n=47; acute lymphoblastic leukemia, n=8), we found that dasatinib, a second-generation broad-spectrum TKI, induced a rapid, dose-dependent and substantial mobilization of non-leukemic lymphocytes and monocytes in blood peaking 1-2 h after an oral intake and the blood counts closely mirrored drug plasma concentration. A preferential mobilization was observed for natural killer (NK), NK T, B and γδ+ T cells. Mobilization was coupled with a more effective transmigration of leukocytes through an endothelial cell layer and improved cytotoxicity of NK cells. Platelet numbers decreased markedly after the drug intake in a proportion of patients. Similar effects on blood cell dynamics and function were not observed with any other TKI (imatinib, nilotinib and bosutinib). Thus, dasatinib induces a unique, rapid mobilization and activation of cytotoxic, extravasation-competent lymphocytes, which may not only enhance antileukemia immune responses but can also be causally related to the side-effect profile of the drug (pleural effusions, thrombocytopenia).
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Affiliation(s)
- S Mustjoki
- Hematology Research Unit Helsinki, Department of Medicine, Division of Hematology, University of Helsinki and Helsinki University Central Hospital (HUCH), Helsinki, Finland
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15
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Liaskou E, Karikoski M, Reynolds G, Lalor P, Weston C, Pullen N, Salmi M, Jalkanen S, Adams D. Regulation of mucosal addressin cell adhesion molecule 1 expression in human and mice by vascular adhesion protein 1 amine oxidase activity. Hepatology 2011; 53:661-72. [PMID: 21225644 PMCID: PMC3031027 DOI: 10.1002/hep.24085] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Accepted: 11/08/2010] [Indexed: 01/06/2023]
Abstract
UNLABELLED Primary sclerosing cholangitis (PSC) and autoimmune hepatitis are hepatic complications associated with inflammatory bowel disease (IBD). The expression of mucosal addressin cell adhesion molecule 1 (MAdCAM-1) on mucosal endothelium is a prerequisite for the development of IBD, and it is also detected on the hepatic vessels of patients with liver diseases associated with IBD. This aberrant hepatic expression of MAdCAM-1 results in the recruitment of effector cells initially activated in the gut to the liver, in which they drive liver injury. However, the factors responsible for the aberrant hepatic expression of MAdCAM-1 are not known. In this study, we show that deamination of methylamine (MA) by vascular adhesion protein 1 (VAP-1) [a semicarbazide-sensitive amine oxidase (SSAO) expressed in the human liver] in the presence of tumor necrosis factor α induces the expression of functional MAdCAM-1 in hepatic endothelial cells and in intact human liver tissue ex vivo. This is associated with increased adhesion of lymphocytes from patients with PSC to hepatic vessels. Feeding mice MA, a constituent of food and cigarette smoke found in portal blood, led to VAP-1/SSAO-dependent MAdCAM-1 expression in mucosal vessels in vivo. CONCLUSION Activation of VAP-1/SSAO enzymatic activity by MA, a constituent of food and cigarette smoke, induces the expression of MAdCAM-1 in hepatic vessels and results in the enhanced recruitment of mucosal effector lymphocytes to the liver. This could be an important mechanism underlying the hepatic complications of IBD.
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Affiliation(s)
- E. Liaskou
- Centre for Liver Research and NIHR Biomedical Research Unit in Liver Disease, University of Birmingham, Birmingham
| | - M. Karikoski
- MediCity Research Laboratory, University of Turku, Turku, Finland
| | - G.M Reynolds
- Centre for Liver Research and NIHR Biomedical Research Unit in Liver Disease, University of Birmingham, Birmingham
| | - P.F Lalor
- Centre for Liver Research and NIHR Biomedical Research Unit in Liver Disease, University of Birmingham, Birmingham
| | - C.J. Weston
- Centre for Liver Research and NIHR Biomedical Research Unit in Liver Disease, University of Birmingham, Birmingham
| | - N. Pullen
- Pfizer Global Research and Development, Sandwich, Kent, UK
| | - M. Salmi
- MediCity Research Laboratory, University of Turku, Turku, Finland,National Institute of Health and Welfare, Turku, Finland,Department of Medical Biochemistry and Genetics, University of Turku, Turku, Finland
| | - S. Jalkanen
- MediCity Research Laboratory, University of Turku, Turku, Finland,Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland,National Institute of Health and Welfare, Turku, Finland
| | - D.H Adams
- Centre for Liver Research and NIHR Biomedical Research Unit in Liver Disease, University of Birmingham, Birmingham
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Martelius T, Salmi M, Krogerus L, Loginov R, Schoultz M, Karikoski M, Miiluniemi M, Soots A, Höckerstedt K, Jalkanen S, Lautenschlager I. Inhibition of Semicarbazide-Sensitive Amine Oxidases Decreases Lymphocyte Infiltration in the Early Phases of Rat Liver Allograft Rejection. Int J Immunopathol Pharmacol 2008; 21:911-20. [DOI: 10.1177/039463200802100415] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Vascular adhesion protein-1 (VAP-1) has been shown to mediate lymphocyte adhesion to endothelia at sites of inflammation in vitro and in vivo. VAP-1 is also an ectoenzyme with semicarbazide-sensitive amine oxidase (SSAO) activity. In this study we investigated whether inhibition of SSAO influences the inflammatory infiltration in acute rat liver allograft rejection. BN recipients of DA liver allografts were treated with 50 mg/kg/d semicarbazide, an inhibitor of SSAO, or similar volumes of saline. 10 rats/group were followed for graft survival, and 10 rats/group were sacrificed on day 7 post-transplantation for histology and T-lymphocyte isolation. The area percentage of portal inflammatory infiltrates in the grafts was assessed from digital photomicrographs. The proportion of CD4-, CD8- and IL2-receptor positive lymphocytes in the graft was quantified with flow cytometry. On day 7, semicarbazide treatment significantly decreased the inflammatory infiltrate area in the grafts. CD4-, CD8- and IL2-receptor positive cells were equally affected. However, animal survival was not affected. Blockade of the enzymatic activity of VAP-1 has a significant effect on lymphocyte infiltration early in acute liver rejection. Later, activation of other adhesion pathways can by-pass the blockade caused by VAP-inhibition.
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Affiliation(s)
- T. Martelius
- Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki
- Department of Virology, University of Helsinki and Helsinki University Hospital, Helsinki
| | - M. Salmi
- MediCity Research Laboratory, University of Turku, Turku
- Department of Bacterial and Inflammatory Diseases, National Public Health Institute, Turku, Finland
| | - L. Krogerus
- Department of Pathology, University of Helsinki and Helsinki University Hospital, Helsinki
| | - R. Loginov
- Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki
- Department of Virology, University of Helsinki and Helsinki University Hospital, Helsinki
| | - M. Schoultz
- Department of Pathology, University of Helsinki and Helsinki University Hospital, Helsinki
| | - M. Karikoski
- MediCity Research Laboratory, University of Turku, Turku
| | - M. Miiluniemi
- MediCity Research Laboratory, University of Turku, Turku
| | - A. Soots
- Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki
| | - K. Höckerstedt
- Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki
| | - S. Jalkanen
- MediCity Research Laboratory, University of Turku, Turku
- Department of Bacterial and Inflammatory Diseases, National Public Health Institute, Turku, Finland
| | - I. Lautenschlager
- Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki
- Department of Virology, University of Helsinki and Helsinki University Hospital, Helsinki
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Airas L, Lindsberg PJ, Karjalainen-Lindsberg ML, Mononen I, Kotisaari K, Smith DJ, Jalkanen S. Vascular adhesion protein-1 in human ischaemic stroke. Neuropathol Appl Neurobiol 2008; 34:394-402. [DOI: 10.1111/j.1365-2990.2007.00911.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Bour S, Prévot D, Guigné C, Stolen C, Jalkanen S, Valet P, Carpéné C. Semicarbazide-sensitive amine oxidase substrates fail to induce insulin-like effects in fat cells from AOC3 knockout mice. J Neural Transm (Vienna) 2007; 114:829-33. [PMID: 17406965 DOI: 10.1007/s00702-007-0671-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [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: 09/29/2006] [Accepted: 11/15/2006] [Indexed: 01/04/2023]
Abstract
Substrates of semicarbazide-sensitive amine oxidases (SSAO) stimulate glucose transport in adipocytes. To definitively demonstrate the involvement of SSAO in this insulin-like effect, glucose transport has been studied in fat cells from mice with a targeted deletion of AOC3, a gene encoding a SSAO called vascular adhesion protein-1. SSAO activity was present in white adipose tissues of wild type (WT) but was absent in AOC3KO mice. The SSAO-substrates benzylamine and methylamine were unable to stimulate hexose transport in adipocytes isolated from AOC3KO mice while they were active in WT adipocytes, especially in combination with vanadate. Impairment of amine-dependent glucose uptake was also observed with tyramine while there was no change in insulin responsiveness. These observations prove that the effects of exogenous or biogenic amines on glucose transport are not receptor-mediated but are oxidation-dependent. They also confirm that the major SSAO form expressed in mouse adipocytes is encoded by the AOC3 gene.
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Affiliation(s)
- S Bour
- Institut National de la Santé et de la Recherche Médicale, U586 INSERM, IFR 31, CHU Rangueil, Toulouse, France
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19
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Abstract
The pathogenesis of chronic kidney rejection characterized by persistent low-level inflammation and intimal thickening of the arteries in the graft remains poorly understood. We studied whether two important endothelial adhesion molecules, vascular adhesion molecule-1 (VAP-1) and peripheral node addressin (PNAd), would contribute to the lymphocyte recruitment into the rejected organ. VAP-1 was found to be present both in the normal kidney and prominently also in the chronically rejected kidneys. In the kidney VAP-1 was a homodimeric sialoglycoprotein expressed in peritubular capillaries, but not on glomerular endothelium or on tubular cells. In contrast, PNAd was absent from all kidney samples, indicating that kidney inflammation differs from other sites of chronic inflammation. Blocking of VAP-1 with mAbs abolished > 50 % of lymphocyte binding to renal vessels in rejected kidney in in vitro adhesion assays. Levels of circulating soluble VAP-1 (sVAP-1) decreased back to normal levels in patients with well-functioning transplants. These results are the first evidence that VAP-1 is able to mediate leukocyte binding into a rejected organ. Thus, anti-adhesive therapies targeting VAP-1 may be useful in controlling chronic kidney graft rejection.
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Affiliation(s)
- R Kurkijärvi
- MediCity Research Laboratory, University of Turku and National Public Health Institute, Department in Turku, Turku, Finland
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20
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Salmi M, Alanen K, Grenman S, Briskin M, Butcher EC, Jalkanen S. Immune cell trafficking in uterus and early life is dominated by the mucosal addressin MAdCAM-1 in humans. Gastroenterology 2001; 121:853-64. [PMID: 11606499 DOI: 10.1053/gast.2001.27968] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS In adults, binding of mucosal addressin cell adhesion molecule 1 (MAdCAM-1) to lymphocyte alpha4beta7 integrin directs cell trafficking to gut, whereas interaction of peripheral node addressins (PNAd) with lymphocyte L-selectin targets immune cells to peripheral lymph nodes (PLNs). Because nothing is known about these addressins during human development, we studied the expression and function of MAdCAM-1 (and PNAd for comparison) in fetuses and children. METHODS Series of human tissue samples obtained from fetuses (7-40 weeks), children (2 months-7 years), and adults were immunostained with monoclonal antibodies. The function of the addressins and their lymphocyte counter-receptors was tested in in vitro binding assays on fetal and adult tissues. RESULTS Unlike in adults, MAdCAM-1 is widely expressed from embryonic week 7 onwards, and it only gradually becomes polarized to mucosal vessels after birth. In utero MAdCAM-1 functionally governs lymphocyte adhesion to vessels both in the gut and PLNs by binding to alpha4beta7 integrin. The later induction of PNAd gradually starts to dominate the binding of lymphocytes to PLNs during childhood. CONCLUSIONS There are striking age-dependent switches and species-specific variation in the molecular mechanisms of lymphocyte migration. In utero and during early childhood, the mucosal addressin MAdCAM-1 plays a dominant role in lymphocyte-endothelial cell adhesion at mucosal and nonmucosal sites.
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Affiliation(s)
- M Salmi
- Department of Medical Microbiology, MediCity Research Laboratory, Turku University and National Public Health Institute, Department in Turku, Finland.
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21
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Jalkanen K, Leu T, Bono P, Salmi M, Jalkanen S, Smith DJ. Distinct ligand binding properties of Mac-2-binding protein and mouse cyclophilin [correction of mousephilin] C-associated protein. Eur J Immunol 2001; 31:3075-84. [PMID: 11592084 DOI: 10.1002/1521-4141(2001010)31:10<3075::aid-immu3075>3.0.co;2-d] [Citation(s) in RCA: 5] [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] [Indexed: 11/10/2022]
Abstract
Human Mac-2-binding protein (Mac-2-BP) is a secreted glycoprotein that is widely expressed. It binds to the human macrophage-associated lectin Mac-2 and has been suggested to have a role in host defence. Mouse cyclophilin C-associated protein (mCyCAP) is also a secreted glycoprotein that binds with high affinity to cyclophilin C in the absence of the immunosuppressive drug cyclosporin A. The two proteins share a similar domain structure and considerable sequence identity, including a highly conserved scavenger receptor cysteine-rich domain, and both of them exert their function within the immune system. To elucidate whether these molecules are also functional homologues, we compared their ligand binding properties using cell lines which express Mac-2-BP or mCyCAP as well as transfected cell lines stably expressing mCyCAP or a mutant version lacking the scavenger domain. These experiments show that Mac-2-BP is unable to bind to either human or mouse cyclophilin C and thatmCyCAP cannot bind to Mac-2. The scavenger domain is not required for the interaction between mCyCAP and cyclophilin C. We conclude that these proteins may be part of a larger family of proteins of immunological importance in which closer functional homologues might exists.
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Affiliation(s)
- K Jalkanen
- Centre for Biotechnology, University of Turku, Turku, Finland.
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22
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Irjala H, Salmi M, Alanen K, Grénman R, Jalkanen S. Vascular adhesion protein 1 mediates binding of immunotherapeutic effector cells to tumor endothelium. J Immunol 2001; 166:6937-43. [PMID: 11359855 DOI: 10.4049/jimmunol.166.11.6937] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Tumor-infiltrating lymphocytes (TIL) can be used as an immunotherapeutic tool to treat cancer. Success of this therapy depends on the homing and killing capacity of in vitro-activated and -expanded TIL. Vascular adhesion protein 1 (VAP-1) is an endothelial molecule that mediates binding of lymphocytes to vessels of inflamed tissue. Here, we studied whether VAP-1 is involved in binding of TIL, lymphokine-activated killer (LAK) cells, and NK cells to vasculature of the cancer tissue. We demonstrated that VAP-1 is expressed on the endothelium of cancer vasculature. The intensity and number of positive vessels varied greatly between the individual specimens, but it did not correlate with the histological grade of the cancer. Using an in vitro adhesion assay we showed that VAP-1 mediates adhesion of TIL, LAK, and NK cells to cancer vasculature. Treatment of the tumor sections with anti-VAP-1 Abs diminished the number of adhesive cells by 60%. When binding of different effector cell types was compared, it was evident that different cancer tissues supported the adhesion of TIL to a variable extent and LAK cells were more adhesive than TIL and NK cells to tumor vasculature. These data suggest that VAP-1 is an important interplayer in the antitumor response. Thus, by up-regulating the expression of VAP-1 in tumor vasculature, it can be possible to improve the effectiveness of TIL therapy.
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MESH Headings
- Amine Oxidase (Copper-Containing)/analysis
- Amine Oxidase (Copper-Containing)/biosynthesis
- Amine Oxidase (Copper-Containing)/physiology
- Carcinoma, Squamous Cell/blood supply
- Carcinoma, Squamous Cell/chemistry
- Carcinoma, Squamous Cell/immunology
- Carcinoma, Squamous Cell/therapy
- Cell Adhesion/immunology
- Cell Adhesion Molecules/analysis
- Cell Adhesion Molecules/biosynthesis
- Cell Adhesion Molecules/physiology
- Endothelium, Vascular/chemistry
- Endothelium, Vascular/immunology
- Endothelium, Vascular/pathology
- Head and Neck Neoplasms/blood supply
- Head and Neck Neoplasms/chemistry
- Head and Neck Neoplasms/immunology
- Head and Neck Neoplasms/therapy
- Humans
- Immunohistochemistry
- Immunotherapy, Adoptive
- Killer Cells, Lymphokine-Activated/immunology
- Killer Cells, Lymphokine-Activated/transplantation
- Killer Cells, Natural/immunology
- Killer Cells, Natural/transplantation
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/transplantation
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Affiliation(s)
- H Irjala
- National Public Health Institute and MediCity Research Laboratory, University of Turku, Tykistökatu 6A, FIN-20520 Turku, Finland.
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23
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Abstract
Ectoenzymes with a catalytically active domain outside the cell surface have the potential to regulate multiple biological processes. A distinct class of copper-containing semicarbazide-sensitive monoamine oxidases, expressed on the cell surface and in soluble forms, oxidatively deaminate primary amines. Via transient covalent enzyme-substrate intermediates, this reaction results in production of aldehydes, hydrogen peroxide and ammonium, which are all biologically active substances. The physiological functions of these enzymes have remained unknown, although they have been suggested to be involved in the metabolism of biogenic amines. Recently, new roles have been proposed for these enzymes in regulation of glucose uptake and, even more surprisingly, in leukocyte-endothelial cell interactions. The emerging functions of ectoenzymes in signalling and cell-cell adhesion suggest a novel mode of molecular control of these complex processes.
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Affiliation(s)
- S Jalkanen
- MediCity Research Laboratory, Turku University, Tykistökatu 6A, 20520 Turku, Finland.
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24
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Salmi M, Jalkanen S. Human leukocyte subpopulations from inflamed gut bind to joint vasculature using distinct sets of adhesion molecules. J Immunol 2001; 166:4650-7. [PMID: 11254724 DOI: 10.4049/jimmunol.166.7.4650] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Reactive arthritis can be triggered by inflammatory bowel diseases. We hypothesized that migration of mucosal immune cells from inflamed gut to joints could contribute to the development of reactive arthritis. Here we isolated gut-derived leukocytes from patients with Crohn's disease and ulcerative colitis. Using function-blocking mAbs and in vitro frozen section adhesion assays we studied whether these cells bind to synovial vessels and which molecules mediate the interaction. The results showed that mucosal leukocytes from inflammatory bowel diseased gut bind well to venules in synovial membrane. Small intestinal lymphocytes adhered to synovial vessels using multiple homing receptors and their corresponding endothelial ligands (CD18-ICAM-1, alpha(4)beta(7)/alpha(4)beta(1)-integrin-VCAM-1, L-selectin-peripheral lymph node addressins, and CD44). Of these, only ICAM-1 significantly supported binding of immunoblasts. In contrast, P-selectin glycoprotein ligand-1-P-selectin interaction accounted for practically all synovial adherence of mucosal macrophages. In addition, blocking of vascular adhesion protein-1 significantly inhibited binding of all these leukocyte subsets to joint vessels. We conclude that different leukocyte populations derived from inflamed gut bind avidly to synovial vessels using distinct repertoire of adhesion molecules, suggesting that their recirculation may contribute to the development of reactive arthritis in inflammatory bowel diseases.
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, Turku University, Turku, Finland.
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25
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Abstract
Leukocyte extravasation from the blood into tissues is of paramount importance for normal immunosurveillance and in mounting adequate inflammatory responses. Multiple traditional adhesion molecules and chemoattractants on leukocytes and endothelial cells are involved in the emigration process. Vascular adhesion protein 1 (VAP-1) is a nonclassical inflammation-inducible endothelial molecule involved in leukocyte-subtype-specific rolling under physiological shear. Molecularly, VAP-1 belongs to a special class of cell surface amino oxidases. The enzymatic reaction itself and the biologically active end products can potentially regulate the adhesive status of the vessel wall. Thus, VAP-1 is an ectoenzyme that has inter-related adhesive and enzymatic functions in regulating physiological trafficking and inflammation.
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, Tykistökatu 6A, University of Turku, FIN-20520 Turku, Finland.
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26
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Abstract
Lymphocytes leave the blood using a sequential adhesion cascade. Vascular adhesion molecule-1 (VAP-1) is a surface-expressed endothelial glycoprotein, which belongs to a distinct subgroup of monoamine oxidases. We show here that catalytic activity of VAP-1 on primary endothelial cells directly regulates lymphocyte rolling under defined laminar shear. VAP-1 seems to bind to a primary amino group presented on the lymphocyte surface and oxidatively deaminate it in a reaction, which results in the formation of a transient covalent bond between the two cell types. Instead, soluble reaction products (aldehydes and hydrogen peroxide) are not needed for the VAP-1-dependent rolling. Enzymatic regulation of lymphocyte adhesion to endothelium provides a previously unrecognized rapid way of controlling the extravasation process.
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, Turku University and National Public Health Institute Department in Turku, Turku FIN-20520, Finland.
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27
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Tohka S, Laukkanen M, Jalkanen S, Salmi M. Vascular adhesion protein 1 (VAP-1) functions as a molecular brake during granulocyte rolling and mediates recruitment in vivo. FASEB J 2001; 15:373-82. [PMID: 11156953 DOI: 10.1096/fj.00-0240com] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Granulocyte extravasation from the blood into tissues is a prerequisite for a proper inflammatory response. It is regulated by a multistep adhesion cascade consisting of successive contacts between leukocyte surface receptors and their endothelial ligands on vessels. Vascular adhesion protein 1 (VAP-1) is an endothelial surface glycoprotein with two functions. It is an enzyme (monoamine oxidase) and an adhesion molecule for lymphocytes. Its function in binding of granulocytes or in leukocyte trafficking into sites of inflammation in vivo has remained unknown. Here we show that treatment of rabbits with anti-VAP-1 monoclonal antibodies abrogates approximately 70% of granulocyte extravasation into a site of an experimental inflammation. Using intravital microscopy, VAP-1 blockade is shown to increase the velocity of the rolling granulocytes and the frequency of their jerky skippings during the rolling. In addition, the number of firmly bound leukocytes decreased by 44% when VAP-1 was rendered nonfunctional. Our results suggest that VAP-1 functions as a molecular brake early in the adhesion cascade and consequently decreases the firm adherence; it may also directly influence the transmigration step. These data elucidate a new interplayer in the granulocyte extravasation process and provide a novel physiological function for a member of the monoamine oxidase family.
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Affiliation(s)
- S Tohka
- MediCity Research Laboratory, Turku University and National Public Health Institute, Department in Turku, Turku, Finland
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28
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Yegutkin GG, Henttinen T, Jalkanen S. Extracellular ATP formation on vascular endothelial cells is mediated by ecto-nucleotide kinase activities via phosphotransfer reactions. FASEB J 2001; 15:251-260. [PMID: 11149913 DOI: 10.1096/fj.00-0268com] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Cell surface ecto-nucleotidases are considered the major effector system for inactivation of extracellular adenine nucleotides, whereas the alternative possibility of ATP synthesis has received little attention. Using a TLC assay, we investigated the main exchange activities of 3H-labeled adenine nucleotides on the cultured human umbilical vein endothelial cells. Stepwise nucleotide degradation to adenosine occurred when a particular nucleotide was present alone, whereas combined cell treatment with ATP and either [3H]AMP or [3H]ADP caused unexpected phosphorylation of 3H-nucleotides via the backward reactions AMP --> ADP --> ATP. The following two groups of nucleotide-converting ecto-enzymes were identified based on inhibition and substrate specificity studies: 1) ecto-nucleotidases, ATP-diphosphohydrolase, and 5'-nucleotidase; 2) ecto-nucleotide kinases, adenylate kinase, and nucleoside diphosphate kinase. Ecto-nucleoside diphosphate kinase possessed the highest activity, as revealed by comparative kinetic analysis, and was capable of using both adenine and nonadenine nucleotides as phosphate donors and acceptors. The transphosphorylation mechanism was confirmed by direct transfer of the gamma-phosphate from [gamma-32P]ATP to AMP or nucleoside diphosphates and by measurement of extracellular ATP synthesis using luciferin-luciferase luminometry. The data demonstrate the coexistence of opposite, ATP-consuming and ATP-generating, pathways on the cell surface and provide a novel mechanism for regulating the duration and magnitude of purinergic signaling in the vasculature.
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Affiliation(s)
- G G Yegutkin
- MediCity Research Laboratory, University of Turku and National Public Health Institute, FIN-20520, Turku, Finland.
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29
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Airas L, Niemelä J, Jalkanen S. CD73 engagement promotes lymphocyte binding to endothelial cells via a lymphocyte function-associated antigen-1-dependent mechanism. J Immunol 2000; 165:5411-7. [PMID: 11067892 DOI: 10.4049/jimmunol.165.10.5411] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CD73 is a GPI-anchored lymphocyte adhesion molecule possessing an ecto-5'-nucleotidase enzyme activity. In this work, we show that engagement of lymphocyte CD73 increases lymphocyte binding to cultured endothelial cells (EC) in an LFA-1-dependent fashion. Engagement of CD73 by an anti-CD73 mAb 4G4 increases the adhesion of lymphocytes to cultured EC by about 80% compared with that of lymphocytes treated with a negative control Ab, and the increased adhesion can be blocked by an anti-CD18 mAb. The CD73-regulated increase in lymphocyte adhesion is not due to a conformational change leading to high-affinity LFA-1 receptors as assayed using mAb 24 against an activation-induced epitope of the molecule. Instead, CD73 engagement induces clustering of LFA-1 that is inhibitable by calpeptin, indicating involvement of Ca(2+)-dependent activation of a calpain-like enzyme in this process. In conclusion, the results shown here demonstrate that CD73 regulates the avidity of LFA-1 by clustering. This indicates a previously undescribed role for CD73 in controlling the poorly characterized activation step in the multistep cascade of lymphocyte extravasation. Moreover, these results suggest that in physiological conditions the activation step may result in clustering of LFA-1 rather than in an affinity change of the molecule.
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Affiliation(s)
- L Airas
- MediCity Research Laboratory, Turku University, and National Public Health Institute, Turku, Finland
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30
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Kurkijärvi R, Yegutkin GG, Gunson BK, Jalkanen S, Salmi M, Adams DH. Circulating soluble vascular adhesion protein 1 accounts for the increased serum monoamine oxidase activity in chronic liver disease. Gastroenterology 2000; 119:1096-103. [PMID: 11040196 DOI: 10.1053/gast.2000.18163] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND & AIMS Vascular adhesion protein 1 (VAP-1) is an endothelial glycoprotein that supports adhesion of lymphocytes to hepatic endothelium and has sequence homology with semicarbazide-sensitive amine oxidases (SSAOs). We investigated whether soluble VAP-1 (sVAP-1) displays SSAO activity and thereby accounts for increased monoamine oxidase activity in the serum of patients with liver diseases. METHODS sVAP-1 concentration and SSAO activity were measured in peripheral, hepatic, and portal blood and in bile from patients with liver disease and in peripheral blood of control subjects, using enzyme-linked immunosorbent assay and enzymatic assays. RESULTS sVAP-1 concentration (mean [+/-SE], 143. 67 [34.97-92.67] ng/mL) and SSAO activity (18.8 [12.0-24.6] nmol. mL(-1). h(-1)) were significantly increased in chronic liver diseases compared with healthy controls (87.1 [53.5-127] ng/mL [P<0.001] and 10.7 [6.5-12.7] nmol. mL(-1) x h(-1) [P<0.05]) but not in massive necrosis caused by paracetamol poisoning (109 [80.3-140] ng/mL and 8.9 [5.7-12.3] nmol. mL(-1) x h(-1)). sVAP-1 correlated with serum transaminase and bilirubin but not with creatinine. In 5 paired samples, sVAP-1 concentration was higher in hepatic (median, 113 [range, 53-122]) than in portal vein (102 [42-109]; 2P<0.05), and was not detected in bile. There was a highly significant correlation between serum sVAP-1 and SSAO activity in normal subjects, patients with acute liver failure, and those with chronic liver disease (r = 0.895; P<0.001). When serum was depleted of sVAP-1 by immunoaffinity chromatography, SSAO activity was eliminated. CONCLUSIONS sVAP-1 levels are increased in chronic liver disease, and sVAP-1 is likely derived from the liver. Serum sVAP-1 displays SSAO activity and accounts for most of the monoamine oxidase activity in human serum.
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Affiliation(s)
- R Kurkijärvi
- MediCity Research Laboratories, University of Turku and National Public Health Institute Department in Turku, Turku, Finland
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31
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Martelius T, Salmi M, Wu H, Bruggeman C, Höckerstedt K, Jalkanen S, Lautenschlager I. Induction of vascular adhesion protein-1 during liver allograft rejection and concomitant cytomegalovirus infection in rats. Am J Pathol 2000; 157:1229-37. [PMID: 11021827 PMCID: PMC1850156 DOI: 10.1016/s0002-9440(10)64638-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Vascular adhesion protein-1 (VAP-1) is an adhesion molecule controlling lymphocyte recirculation through high endothelial venules of the lymph nodes. It has also been shown to be induced and to mediate lymphocyte adhesion at sites of inflammation. We studied the expression of VAP-1 and two other inducible adhesion molecules ICAM-1 and VCAM-1 in our experimental model of rat liver allograft rejection and, in addition, the effect of concomitant rat cytomegalovirus (RCMV) infection on this expression. Expression of VAP-1, ICAM-1, and VCAM-1 was studied in rat liver allografts with or without RCMV infection, isografts, and normal rat liver. Immunoperoxidase technique and monoclonal antibodies including a novel anti-VAP-1 reagent were used. VAP-1 expression was induced by acute rejection in sinusoids, hepatocytes, and also in bile ducts, when compared to the isografts or normal liver, where only blood vessels were consistently positive. Sinusoidal and hepatocyte expression of VAP-1 was prolonged by the presence of RCMV. ICAM-1 and VCAM-1 expression was also induced by acute rejection. However, RCMV increased sinusoidal VCAM-1 expression compared to uninfected grafts. The present experimental study shows that VAP-1 is up-regulated in acute rejection of liver allografts, and that this up-regulation is prolonged by RCMV infection.
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Affiliation(s)
- T Martelius
- Departments of Surgery and Virology, Helsinki University Hospital, and University of Helsinki, Helsinki, Finland.
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32
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Kirveskari J, Bono P, Granfors K, Leirisalo-Repo M, Jalkanen S, Salmi M. Expression of alpha4-integrins on human neutrophils. J Leukoc Biol 2000; 68:243-50. [PMID: 10947069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
alpha4 Integrins are important adhesion molecules mediating binding of lymphocytes, monocytes, and eosinophils to multiple cellular and extracellular ligands. Mature neutrophils have been recently suggested to express alpha4-integrins as well. We studied whether human neutrophils can synthesize alpha4-integrins upon activation in vitro or in vivo. Two anti-alpha4 mAbs, but not multiple subclass-matched non-binding controls, reacted with granulocytes in an inducer and time-dependent manner. Nevertheless, staining with Ig subclass-specific second-stage reagents surprisingly revealed that commercial anti-alpha4 mAbs contain two distinct Igs, the alpha4-specific IgG1 and an IgG2a of an unknown specificity. We showed that in vitro inductions used by us and others only induce the binding of nonspecific IgG2a from the commercial HP2/1 to activated neutrophils. By reverse-transcriptase polymerase chain reaction, alpha4 mRNA was not detectable in purified neutrophils. Our results show that alpha4 integrin protein and mRNA are absent from normal and stimulated human neutrophils.
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Affiliation(s)
- J Kirveskari
- National Public Health Institute, Department in Turku, Finland
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33
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Jaakkola K, Jalkanen S, Kaunismäki K, Vänttinen E, Saukko P, Alanen K, Kallajoki M, Voipio-Pulkki LM, Salmi M. Vascular adhesion protein-1, intercellular adhesion molecule-1 and P-selectin mediate leukocyte binding to ischemic heart in humans. J Am Coll Cardiol 2000; 36:122-9. [PMID: 10898423 DOI: 10.1016/s0735-1097(00)00706-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The expression of endothelial adhesion molecules and their functional significance in leukocyte adhesion to human myocardial blood vessels in acute myocardial infarction (AMI) were studied. BACKGROUND Leukocyte extravasation, mediated by specific adhesion molecules, exacerbates tissue injury after restoration of blood supply to an ischemic tissue. Experimental myocardial reperfusion injury can be alleviated with antibodies that block the function of adhesion molecules involved in leukocyte emigration, but the relevant molecules remain poorly characterized in human AMI. METHODS Semiquantitative immunohistochemistry and in vitro adhesion assays were used to study the expression and granulocyte binding abilities of different endothelial adhesion molecules in human AMI. Changes in the molecular nature of vascular adhesion protein-1 (VAP-1) were evaluated using immunoblotting. RESULTS Certain endothelial adhesion molecules (intercellular adhesion molecule [ICAM-2], CD31 and CD73) were expressed in myocardial blood vessels homogeneously in normal and ischemic hearts, whereas others (E-selectin and peripheral lymph node addressin) were completely absent from all specimens. The synthesis of ICAM-1 was locally, and that of P-selectin regionally, upregulated in the infarcted hearts when compared with nonischemic controls. Vascular adhesion protein-1 showed ventricular preponderance in expression and alterations in posttranslational modifications during ischemia-reperfusion. Importantly, P-selectin, ICAM-1 and VAP-1 mediated granulocyte binding to blood vessels in the ischemic human heart. CONCLUSIONS Human P-selectin, ICAM-1 and VAP-1 appear to be the most promising targets when antiadhesive interventions preventing leukocyte-mediated tissue destruction after myocardial ischemia are planned.
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Affiliation(s)
- K Jaakkola
- National Public Health Institute and MediCity Research Laboratory, University of Turku, Finland
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34
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Abstract
Lymphocyte binding to vascular endothelium is a prerequisite for the movement of immune cells from the blood into lymphoid tissues and into sites of inflammation. Human vascular adhesion protein-1 (VAP-1) is an endothelial glycoprotein involved in this interaction. It also displays an enzymatic (monoamine oxidase) activity. Here we examined how recombinant human VAP-1 mediates lymphocyte binding using rotatory and flow chamber binding assays. VAP-1 cDNA transfected into an endothelial cell line, which does not bind lymphocytes, renders the cell line capable of binding lymphocytes in a shear-dependent manner. VAP-1 transfectants bound lymphocytes 5 times better than monocytes with a preference for T killer cells, and no specific granulocyte adherence was detectable. The binding is partially inhibited by anti-VAP-1 monoclonal antibodies or by blocking lymphocyte L-selectin and CD18 integrins, but not by inhibition of several other homing-associated molecules. In contrast, CD44 ligation on lymphocytes markedly upregulates their VAP-1-dependent adhesion, suggesting that the VAP-1 counterreceptor can be activated via CD44. The transfectant model also allowed us to perform detailed structure-function analyses of VAP-1. We show that the exposed integrin-binding motif RGD or the enzymatic activity is not indispensable for VAP-1-dependent adhesion. Together, these data show that VAP-1 can reconstitute the lymphocyte-endothelial adhesion cascade under shear and propose a critical role for VAP-1 in lymphocyte emigration from the blood.
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, University of Turku, and National Public Health Institute, Department in Turku, Turku, Finland.
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35
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Abstract
During normal placentation trophoblast cells invade maternal tissues and remodel the uterine arteries into low-resistance channels. In pre-eclampsia, trophoblast invasion is impaired and this, along with endothelial dysfunction, has been suggested to play a role in the pathogenesis of pre-eclampsia. We studied the expression of adhesion molecules important for leukocyte extravasation in the placental bed with immunohistochemistry and compared the expression in pre-eclampsia to that in normal pregnancy. Our major finding was that only invasive trophoblasts expressed cutaneous lymphocyte antigen-1 (CLA-1) in the third trimester of pregnancy, whereas villous trophoblasts did not. In the first trimester both villous trophoblasts and invasive trophoblast cells in decidua remained negative for CLA-1. Pre-eclampsia did not change the expression of leukocyte-endothelium adhesion or lymphocyte homing-associated antigens, ICAM-1, ICAM-2, VCAM, P-selectin, E-selectin, L-selectin, CLA-1, CD73, VAP-1 and alphaEbeta7 in the placental bed. Furthermore, pre-eclampsia was not associated with an aberrant accumulation of lymphocytes carrying antigens of any particular known organ-specific homing systems. The results on the unchanged pattern of adhesion molecule expression in pre-eclampsia suggests that there is no major change in the adhesive properties of the endothelium of the placental bed in pre-eclampsia.
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Affiliation(s)
- K Jaakkola
- National Public Health Institute and MediCity Research Laboratory, University of Turku, Tykistökatu 6 a, Turku, FIN-20520, Finland
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36
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Bono P, Jalkanen S, Salmi M. Mouse vascular adhesion protein 1 is a sialoglycoprotein with enzymatic activity and is induced in diabetic insulitis. Am J Pathol 1999; 155:1613-24. [PMID: 10550318 PMCID: PMC1866981 DOI: 10.1016/s0002-9440(10)65477-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The continuous recirculation of lymphocytes requires an adequate expression and function of the molecules mediating the cellular interactions between endothelium and lymphocytes. Human vascular adhesion protein 1 (hVAP-1) is an endothelial cell adhesion molecule that mediates the binding of lymphocytes to venules in peripheral lymph nodes as well as at sites of inflammation. Recently the mouse homologue of hVAP-1 has been cloned. It is a previously unknown molecule with a significant sequence identity to copper-containing amine oxidases. Besides the sequence, very little is known about the expression, structure, and function of mouse VAP-1 (mVAP-1). In this study we demonstrate that mVAP-1 is prominently expressed in endothelial and smooth muscle (but not in other types of muscle cells), as well as in adipocytes. mVAP-1 is a 220-kd homodimeric sialoglycoprotein that displays cell-type-specific differences in glycosylation. The expression of mVAP-1 is induced on inflammation in the vessels of the endocrine pancreas during the development of insulitis, and the up-regulation correlates with the extent of the lymphocytic infiltrate. In general, different mouse strains displayed very similar VAP-1 expression, but the small differences seen in liver and gut suggest that immunostimulation may modulate VAP-1 synthesis in extrapancreatic organs as well. Finally, we show that mVAP-1 has a monoamine oxidase activity against naturally occurring substrates, implying a role in the development of vasculopathies. These data show that mVAP-1 and hVAP-1 are very similar molecules that nevertheless have certain marked differences in expression, biochemical structure, and substrate specificity. Thus mVAP-1 is a novel inflammation-inducible mouse molecule that has a dual adhesive and enzymatic function.
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Affiliation(s)
- P Bono
- MediCity Research Laboratories, University of Turku, Turku, Finland
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37
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, University of Turku and National Public Health Institute Department in Turku, Finland
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38
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Abstract
CD44 molecule is a cell surface glycoprotein involved in several cell-cell and cell-matrix interactions. It has been linked to the growth and spread of malignancies. The majority of non-Hodgkin's lymphomas (NHL) express CD44 reflecting the CD44 expression of the normal lymphocytic counterparts. Cell surface CD44 has been suggested to be involved in hematogenous distribution of NHL, and elevated levels of serum CD44 (s-CD44) have been detected in various malignant diseases. Circulating s-CD44 has been found to be functionally active according to several functional studies. In patients with NHL increased s-CD44 levels have been detected at the time of diagnosis and at progression of the disease and s-CD44 levels change in parallel with response to therapy. Moreover, a high s-CD44 level at diagnosis is associated with a high tumor burden, poor response to treatment and unfavorable outcome in NHL.
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Affiliation(s)
- R Ristamäki
- Department of Oncology, Turku University Central Hospital, National Public Health Institute, Turku University, Finland.
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39
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Wuorela M, Tohka S, Granfors K, Jalkanen S. Monocytes that have ingested Yersinia enterocolitica serotype O:3 acquire enhanced capacity to bind to nonstimulated vascular endothelial cells via P-selectin. Infect Immun 1999; 67:726-32. [PMID: 9916083 PMCID: PMC96379 DOI: 10.1128/iai.67.2.726-732.1999] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Reactive arthritis is usually a self-limiting polyarthritis which develops after certain gastrointestinal or urogenital infections. Microbial antigens found in the inflamed joints are thought to play a key role in the development of this disease. It is not known how antigens of the pathogenic organisms migrate from the mucosal tissues into the joints. The data presented here show that mononuclear phagocytes which mediate the dissemination of several intracellular pathogens acquire an enhanced capacity to bind to nonstimulated vascular endothelial cells after phagocytosis of Yersinia enterocolitica O:3, one of the causative organisms of reactive arthritis. The increased binding to previously nonstimulated endothelial cells was mediated by P-selectin, whose translocation to the endothelial cell surface was induced by monocytes with intracellular Yersinia bacteria. These results suggest that mononuclear phagocytes may be responsible for the dissemination of bacterial antigens and the initiation of the joint inflammation in reactive arthritis.
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Affiliation(s)
- M Wuorela
- National Public Health Institute, University of Turku, Turku, Finland
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40
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Salminen TA, Smith DJ, Jalkanen S, Johnson MS. Structural model of the catalytic domain of an enzyme with cell adhesion activity: human vascular adhesion protein-1 (HVAP-1) D4 domain is an amine oxidase. Protein Eng 1998; 11:1195-204. [PMID: 9930668 DOI: 10.1093/protein/11.12.1195] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Human vascular adhesion protein-1 (HVAP-1) is a multifunctional protein having at least two different cellular roles, functioning both as a lymphocyte-endothelial cell adhesion protein and as an enzyme with monoamine oxidase activity. HVAP-1 is a 180 kDa homodimeric glycoprotein consisting of a membrane-spanning domain and three predicted extracellular copper-containing amine oxidase domains. In HVAP-1 the extracellular domains are composed of a large domain D4, containing the active site and forming the interface of the dimer, while the smaller D2 and D3 domains surround the D4 dimer near the entrance to the active site. The structural model of the catalytic D4 domain of HVAP-1 reveals that all components necessary for enzymatic monoamine oxidase activity are indeed present within the HVAP-1 and pinpoints residues that may be key to substrate entry through a channel to the active site and residues likely to be involved in substrate specificity as well as structural features critical to dimer formation. Proper glycosylation is required for the cell adhesion function of HVAP-1 and the predicted location of the sugar units at the solvent-exposed surface suits this function well.
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Affiliation(s)
- T A Salminen
- Department of Biochemistry and Pharmacy, Abo Akademi University, Turku, Finland.
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41
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Bono P, Salmi M, Smith DJ, Leppänen I, Horelli-Kuitunen N, Palotie A, Jalkanen S. Isolation, structural characterization, and chromosomal mapping of the mouse vascular adhesion protein-1 gene and promoter. J Immunol 1998; 161:2953-60. [PMID: 9743358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Vascular adhesion protein-1 (VAP-1) is an endothelial cell adhesion molecule which mediates lymphocyte binding to endothelial cells. The cloning of a mouse VAP-1 (mVAP-1) cDNA revealed that mVAP-1 is a novel 110/220 kDa transmembrane molecule with significant identity to copper-containing amine oxidases. In this work the nucleotide sequence and primary structure of the mVAP-1 gene was determined and the promoter region was structurally characterized. The isolated approximately 14.4-kb mVAP-1 gene consists of 4 exons and 3 introns. Primer extension analysis and 5' rapid amplification of cDNA ends revealed multiple transcription initiation sites in different tissues suggesting that the mVAP-1 transcription is differently regulated in different tissues. Analysis of the sequence immediately upstream of the detected transcription initiation sites showed no canonical TATA or CCAAT elements, but putative regulatory elements were found close to the detected transcription start sites. The cloning of the mVAP-1 gene reveals the first insight into the genomic organization of murine amine oxidases and will, by targeted disruption of the gene, allow us to understand better the importance of VAP-1 in leukocyte trafficking and monoamine oxidase activity for the function of the immune system.
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Affiliation(s)
- P Bono
- MediCity Research Laboratories, University of Turku, National Public Health Institute, Finland.
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42
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Kurkijärvi R, Adams DH, Leino R, Möttönen T, Jalkanen S, Salmi M. Circulating form of human vascular adhesion protein-1 (VAP-1): increased serum levels in inflammatory liver diseases. J Immunol 1998; 161:1549-57. [PMID: 9686623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Vascular adhesion protein-1 (VAP-1) is a dimeric 170-kDa endothelial transmembrane molecule that under normal conditions is most strongly expressed on the high endothelial venules of peripheral lymph nodes and on hepatic endothelia. It is a glycoprotein that mediates tissue-selective lymphocyte adhesion in a sialic acid-dependent manner. In this study, we report the detection of a soluble form of VAP-1 in circulation. We developed a quantitative sandwich ELISA using novel anti-VAP-1 mAbs and used it to determine the levels of soluble VAP-1 (sVAP-1) in the serum of healthy individuals and in patients with inflammatory diseases. In healthy persons, circulating sVAP-1 concentrations were 49 to 138 ng/ml. Immunoblotting studies revealed that the apparent molecular mass of dimeric sVAP-1 is slightly (approximately 10 kDa) higher than that of transmembrane VAP-1 under nonreducing conditions. In contrast, the electrophoretic mobilities of monomeric sVAP-1 and transmembrane VAP-1 were similar after reduction and boiling. Adhesion assays showed that the circulating sVAP-1 modulates lymphocyte binding to endothelial cells. Inflammation can cause an elevation of serum sVAP-1 levels, because sVAP-1 concentrations in patients with certain liver diseases were two- to fourfold higher than those in normal individuals. In contrast, rheumatoid arthritis and inflammatory bowel diseases were not associated with elevated levels of sVAP-1. These findings indicate that there is a functionally active, soluble form of VAP-1 in circulation and suggest that the serum level of sVAP-1 might be a useful marker of disease activity in inflammatory liver diseases.
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Affiliation(s)
- R Kurkijärvi
- National Public Health Institute, Turku University, Finland.
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43
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Abstract
Vascular adhesion protein 1 (VAP-1) is a human endothelial sialoglycoprotein whose cell surface expression is induced under inflammatory conditions. It has been shown previously to participate in lymphocyte recirculation by mediating the binding of lymphocytes to peripheral lymph node vascular endothelial cells in an L-selectin-independent fashion. We report here that the VAP-1 cDNA encodes a type II transmembrane protein of 84.6 kD with a single transmembrane domain located at the NH2-terminal end of the molecule and six potential N-glycosylation sites in the extracellular domain. In vivo, the protein exists predominantly as a homodimer of 170-180 kD. Ax endothelial cells transfected with a VAP-1 cDNA express VAP-1 on their cell surface and bind lymphocytes, and the binding can be partially inhibited with anti-VAP-1 mAbs. VAP-1 has no similarity to any currently known adhesion molecules, but has significant identity to the copper-containing amine oxidase family and has a monoamine oxidase activity. We propose that VAP-1 is a novel type of adhesion molecule with dual function. With the appropriate glycosylation and in the correct inflammatory setting, its expression on the lumenal endothelial cell surface allows it to mediate lymphocyte adhesion and to function as an adhesion receptor involved in lymphocyte recirculation. Its primary function in other locations where it is expressed, such as smooth muscle, may depend on its inherent monoamine oxidase activity.
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Affiliation(s)
- D J Smith
- MediCity Research Laboratories, University of Turku, FIN-20520 Turku, Finland.
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44
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Abstract
Soluble isoforms of various adhesion molecules have recently been observed in the blood circulation, but the physiological effects of such molecules remain unsettled. Our earlier results indicate that soluble CD44 can be detected in sera of healthy individuals and that significantly higher levels of serum CD44 (s-CD44) can be found in lymphoma patients. The serum level of the standard form of CD44 parallels the clinical treatment response in patients with lymphoma. In the present study, we have investigated the clinical significance of s-CD44 in non-Hodgkin's lymphoma measured at the time of the diagnosis. S-CD44 was measured from the sera of 123 patients with non-Hodgkin's lymphoma by dot blotting high levels of s-CD44 were associated with high serum levels of lactate dehydrogenase and thymidine kinase, high histological grade of malignancy and poor overall survival. However, s-CD44 level did not have independent prognostic value in a multivariate analysis. In conclusion, a high s-CD44 level at the time of diagnosis was associated with poor survival and several other adverse prognostic factors. Our previous and present studies taken together suggest that measurement of s-CD44 is a valuable tool to monitor treatment response in lymphoma patients. However, it may not be an improved prognostic marker.
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Affiliation(s)
- R Ristamäki
- National Public Health Institute, Department of Oncology, University of Turku, Finland.
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45
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Hänninen A, Jaakkola I, Jalkanen S. Mucosal addressin is required for the development of diabetes in nonobese diabetic mice. J Immunol 1998; 160:6018-25. [PMID: 9637517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Immune responses are best initiated in the environment of lymphoid tissues wherein circulating lymphocytes enter by interacting with endothelial adhesion molecules. In type 1 diabetes, immune responses against pancreatic islets develop, but the environment in which this occurs remains unidentified. To determine whether lymphocyte homing to lymphoid organs is involved in the pathogenesis of diabetes in nonobese diabetic (NOD) mice, we blocked the function of the mucosal addressin cell adhesion molecule-1 (MAdCAM-1), which is a vascular addressin-mediating lymphocyte homing into mucosal lymphoid tissues, in these mice. While ineffective if started later, a blockade started at 3 wk of age reduced the incidence of diabetes from 50% to 9% (p < 0.01). This finding is associated with Peyer's patch atrophy, a marked decrease of naive (CD44(low) CD45RB(high)) T lymphocytes, and a reduction in the relative numbers of memory (CD44(high)) T lymphocytes in the spleen. The potential of these spleen cells to cause diabetes was diminished. Anti-MAdCAM-1 treatment also inhibited both lymphocyte entry into the pancreas and diabetes development in NOD/SCID recipients after the transfer of lymphocytes derived from the mesenteric lymph nodes of young, but not of diabetic, NOD donors. Therefore, MAdCAM-1 may be required during two distinct steps in an early phase of diabetes development: for the entry of naive lymphocytes into the lymphoid tissues in which diabetes-causing lymphocytes are originally primed, and for the subsequent homing of these lymphocytes into the pancreas. The role of MAdCAM-1 as a mucosal vascular addressin suggests that mucosal lymphoid tissues are involved in the initiation of pathologic immune responses in NOD mice.
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Affiliation(s)
- A Hänninen
- MediCity Research Laboratory, University of Turku, Finland
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46
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Salmi M, Hellman J, Jalkanen S. The role of two distinct endothelial molecules, vascular adhesion protein-1 and peripheral lymph node addressin, in the binding of lymphocyte subsets to human lymph nodes. J Immunol 1998; 160:5629-36. [PMID: 9605169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Lymphocyte binding to high endothelial venules (HEV) in noninflamed peripheral lymph nodes (PLN) relies heavily on two endothelial adhesion molecules called vascular adhesion protein-1 (VAP-1) defined by mAb 1B2 and the peripheral lymph node addressins (PNAd) defined by mAb MECA-79. Data from several different groups indicate that these two molecules share several characteristics in expression, biochemical structure, and function, raising the possibility that VAP-1 may be identical to the 170- and 90-kDa species of PNAd glycoproteins. In this study, we show that many PLN HEV coexpress these two molecules. In parallel SDS-PAGE analyses, the m.w. of the 90- and 170-kDa forms of these molecules are indistinguishable. Nevertheless, we show by different metabolic labelings, by reciprocal cross-precipitations, and by immunofluorescence stainings of newly established VAP-1 transfectants that the 90- and 170-kDa species of PNAd and VAP-1 are distinct molecules. In functional terms, VAP-1 is strikingly selective in mediating PLN HEV adhesion of CD8-positive, but not of CD4-positive T cells. In contrast, PNAd contributes to the adhesion of both CD4-positive and CD8-positive cells to these vessels. Together, these data show that initial adhesion of CD8-positive lymphocytes to PLN HEV requires a PNAd- and a VAP-1-dependent step that are both essential and may occur simultaneously or sequentially.
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, University of Turku, Finland.
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47
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Kirveskari J, Jalkanen S, Mäki-Ikola O, Granfors K. Increased synovial endothelium binding and transendothelial migration of mononuclear cells during Salmonella infection. Arthritis Rheum 1998; 41:1054-63. [PMID: 9627015 DOI: 10.1002/1529-0131(199806)41:6<1054::aid-art12>3.0.co;2-q] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE To investigate the adhesion and extravasation capacity of peripheral blood mononuclear cells (PBMC) and the transport of bacterial antigens within these cells during Salmonella infection. METHODS Thirteen patients who were part of 2 outbreaks of Salmonella enteritidis infection were included in this study. The capacity of PBMC from these patients to bind to vascular endothelium in inflamed synovium was tested using a Stamper-Woodruff-type frozen-section assay. The same cells were studied for the presence of Salmonella antigens by immunofluorescence staining. The transendothelial migration of mononuclear cells containing Salmonella or its components through unstimulated endothelial cell layer was quantified. RESULTS The capacity of PBMC to adhere to synovial vessels was significantly increased during Salmonella infection (P=0.0003). Monocytes had a transiently high adhesive state between 2 and 5 weeks after the patients had eaten the contaminated food. The cells containing Salmonella antigens were concentrated in the transmigrated population. CONCLUSION During acute Salmonella infection the increased binding of PBMC to vascular endothelium in inflamed synovium and enhanced transmigration of PBMC containing Salmonella may be the key factors leading to transport of bacterial antigens through the endothelial barrier and initiation of arthritis in susceptible individuals.
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Affiliation(s)
- J Kirveskari
- National Public Health Institute, Turku, Finland
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48
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Bono P, Salmi M, Smith DJ, Jalkanen S. Cloning and characterization of mouse vascular adhesion protein-1 reveals a novel molecule with enzymatic activity. J Immunol 1998; 160:5563-71. [PMID: 9605161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Human vascular adhesion protein-1 (VAP-1) is a sialylated endothelial cell adhesion molecule mediating the initial L-selectin-independent interactions between lymphocytes and endothelial cells in man. In this work we cloned and characterized mouse VAP-1 (mVAP-1) and produced an anti-mVAP-1 mAb against a recombinant mVAP-1 fusion protein. The isolated cDNA encodes a novel 84.5-kDa mouse molecule. The anti-mVAP-1 mAb stained high endothelial venules in peripheral lymph nodes, and smooth muscle cells and lamina propria vessels in gut. During immunoblotting, this anti-mVAP-1 mAb recognized a 110/220-kDa Ag, suggesting that mVAP-1 is a dimer. Since mVAP-1 has significant sequence identity to members of a family of enzymes called the copper-containing amine oxidases, we showed that mVAP-1 possesses monoamine oxidase activity. Thus, mVAP-1 is the first mouse membrane-bound amine oxidase identified at the molecular level. Based on the 83% identity between the isolated cDNA and human VAP-1 cDNA, the expression pattern, the molecular mass, and the enzyme activity against monoamines, the cloned molecule represents a mouse homologue of human VAP-1. Cloning of mVAP-1 provides a valuable tool for in vivo studies of the significance of VAP-1 for lymphocyte-endothelial cell interactions and of the possible relationship between leukocyte adhesion and amine oxidase activity.
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Affiliation(s)
- P Bono
- MediCity Research Laboratory, University of Turku, Finland.
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49
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Jaakkola K, Knuuti J, Söderlund K, Saraste A, Jalkanen S, Voipio-Pulkki LM. Labelling lymphocytes with technetium99m-hexamethyl propyleneamine oxime for scintigraphy: an improved labelling procedure. J Immunol Methods 1998; 214:187-97. [PMID: 9692870 DOI: 10.1016/s0022-1759(98)00045-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Leukocyte scintigraphy has been used as a standard diagnostic procedure for the detection of inflammation in vivo. In this study, we developed a method of labelling purified lymphocytes with technetium99m-hexamethyl propyleneamine oxime (Tc99m-HMPAO) without significantly impairing their function. This was confirmed by measurements of in vitro lymphocyte adhesion and migration and of both necrotic and apoptotic cell death. The results of the in vitro control studies indicate that the dysfunction of leukocytes caused by Tc99m-HMPAO labelling can be minimized by using a gentle labelling method and low Tc99m activity. Because lymphocytes have been thought to participate specifically in the pathogenesis of inflammatory bowel disease (IBD), we compared scintigraphies obtained with Tc99m-HMPAO-labelled purified lymphocytes and mixed leukocytes in colitis patients. We found that a lower number of Tc99m-HMPAO-labelled peripheral blood lymphocytes accumulated in the inflamed colon during the first 4 h than labelled mixed leukocytes. The results are likely to reflect the dissimilar kinetics of lymphocyte traffic compared with granulocytes in IBD. We do not recommend the use of Tc99m-HMPAO-labelled purified lymphocytes as a diagnostic tool in chronic colitis. However, the in vitro data indicate that Tc99m-HMPAO-labelled lymphocytes may be suitable for studying short term lymphocyte recirculation and lymphocyte kinetics in other types of inflammation.
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Affiliation(s)
- K Jaakkola
- Department of Medicine, University of Turku, Finland.
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50
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Abstract
Crohn's disease and ulcerative colitis are quite often complicated with manifestations in extraintestinal organs like joints, eye, and skin. Although the etiopathogenesis of these nonmucosal complications remains unsettled, they all share the characteristic feature of inappropriate leukocyte recruitment in nonlymphatic organs. Under normal conditions, lymphocytes recirculate between the blood and lymphoid organs in search of their cognate antigens, whereas polymorphonuclear leukocytes are excluded from tissues. On inflammation, the leukocyte trafficking changes dramatically. Granulocytes infiltrate into the inflammatory focus very rapidly, and they are followed by lymphocytes, especially activated immunoblasts and memory cells, which now also leave the vasculature at nonlymphoid tissues. Leukocyte extravasation from the blood into the tissue is a multistep process governed by sequential interactions between adhesion molecules expressed on the surface of leukocytes and their ligands on the luminal side of the endothelial cells lining the vessels. In this review, we describe the recirculation routes of mucosal lymphocytes in physiologic conditions, as well as the changes seen in mucosal and extramucosal homing in inflammatory bowel disease (IBD). We present a working model of how adhesive molecular interactions between mucosal immune cells and endothelial cells may explain the pathogenesis of the development of inflammatory cell infiltrate in distant organs in IBD, and how this information may help to plan new antiadhesive therapeutic strategies.
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Affiliation(s)
- M Salmi
- MediCity Research Laboratory, University of Turku, Finland
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