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  • 1.
    Cedergren, Jan
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Radical aspects on arthritis: the role of neutrophil generation of nitric oxide and superoxide in inflammatory conditions2007Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Vid reumatiska ledinflammationer ansamlas mycket stora mängder polymorfkärniga neutrofila granulocyter (neutrofiler) inne i den vätskefyllda ledhålan. Neutrofiler har kraftfull destruktiv potential och anses kunna bidra till uppkomst av skada i leden. Då flera djurmodeller av ledinflammation har visat sig omöjliga att initiera i frånvaro av neutrofiler, har intresset för denna celltyp åter ökat efter att de under lång tid har stått i skuggan av andra typer av vita blodkroppar. En viktig del i avdödning av mikroorganismer och cellsignalering är förmågan att bilda fria syreradikaler, t.ex. superoxid (˙O2-) och kväveoxid (NO˙). Denna avhandling belyser aspekter kring produktionen av dessa reaktiva syreprodukter och mekanismer av potentiell betydelse vid ledinflammation.

    I det första arbetet visas att neutrofiler isolerade ur ledvätska från patienter med ledgångsreumatism (RA) har ett unikt beteende avseende superoxidproduktion jämfört med motsvarande celler från patienter med andra reumatiska sjukdomar. RA-neutrofiler från ledvätska (men inte från blod) producerar superoxid intracellulärt redan i vila och stimulering via vidhäftningsmolekyler ger en snabb ytterligare ökning av denna aktivitet. Fyndet antyder att cellerna är engagerade med hantering av endocyterade partiklar och/eller immunkomplex/immunaggregat.

    I de båda nästkommande arbetena undersöktes förekomst av det NO˙-producerande enzymet iNOS i neutrofiler. En rad tidigare publikationer har rapporterat motsägelsefulla resultat i denna fråga. Efter en serie experiment kunde vi konstatera att humana neutrofiler uttrycker iNOS konstitutivt, men att både dess cellulära lokalisation och reglering skiljer sig från andra celler.

    Neutrofiler har nyligen även visats innehålla arginas, ett enzym som konkurrerar med iNOS om bindningen till L-arginin och som därmed kan hämma NO˙-produktion. I det fjärde arbetet undersökte vi därför om hämning av arginas påverkade neutrofilernas funktion och produktion av superoxid. Vi fann att effekterna av arginashämning var större hos celler som stimulerats genom vidhäftning av kollagenklädda partiklar jämfört med en löslig formylerad tri-peptid (fMLF). Vidare, kunde vi visa att vidhäftning av kollagenklädda partiklar medför större extracellulär frisättning av arginas. Med stöd av dessa fynd kunde vi i påföljande försök bekräfta hypotesen att extracellulär frisättning av arginas är större efter vidhäftning av kollagen-partiklar än med fMLF-stimulering. Fysiologiskt är fyndet logiskt då det skulle medföra ökade vidhäftningsmöjligheter för neutrofilen inne i blodbanan genom att begränsa blodkärlets egen NO˙ produktion. Fyndet är också förenligt med den ökade frekvensen hjärt- och kärlsjukdomar vid RA, då en intensiv kontinuerlig utvandring av neutrofiler skulle medföra ökad arginas frisättning, sänkta argininnivåer och endotelial dysfunktion.

    Delarbeten
    1. Intracellular oxidative activation in synovial fluid neutrophils from patients with rheumatoid arthritis but not from other arthritis patients
    Öppna denna publikation i ny flik eller fönster >>Intracellular oxidative activation in synovial fluid neutrophils from patients with rheumatoid arthritis but not from other arthritis patients
    2007 (Engelska)Ingår i: Journal of Rheumatology, ISSN 0315-162X, E-ISSN 1499-2752, Vol. 34, nr 11, s. 2162-2170Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Objective: To compare total and intracellular oxidative activation of blood and synovial fluid (SF) neutrophils from patients with rheumatoid arthritis (RA) and other arthritides with blood donor neutrophils.

    Methods: Peripheral blood and SF samples were obtained from 26 gonarthritis patients (13 RA, 13 non-RA) attending the rheumatology unit for therapeutic joint aspiration. Isolated neutrophils were stimulated by a formylated tripeptide (fMLF) or by microbeads coated with collagen-I. Formation of superoxide-anion-derived reactive oxygen species (ROS) was studied by luminol-enhanced chemiluminescence. Paired samples of blood and SF neutrophils from patients with active arthritis were compared with blood neutrophils from patients in remission and from 47 healthy blood donors.

    Results: SF neutrophils from patients with RA, but not from non-RA patients, showed high baseline intracellular ROS production. Blood neutrophils from arthritis patients in remission existed in a primed state as revealed by more rapid oxidative response after collagen-bead challenge and a more pronounced response after fMLF stimulation compared to healthy blood donors. Blood neutrophils from RA patients with ongoing gonarthritis, however, did not differ from healthy blood donors concerning oxidative activation, whereas blood neutrophils from non-RA patients with gonarthritis showed a significantly lower peak ROS production.

    Conclusions: A novel finding with pathogenetic implications in our study is that SF neutrophils from patients with RA, but not other arthritides, are activated and produce ROS intracellularly. This implies that synovial neutrophils in RA are engaged in the processing of endocytosed material.

    Nyckelord
    Neutrophils, Arthritis, Reactive oxygen species, Superoxide anion
    Nationell ämneskategori
    Medicin och hälsovetenskap
    Identifikatorer
    urn:nbn:se:liu:diva-14585 (URN)
    Tillgänglig från: 2007-08-27 Skapad: 2007-08-27 Senast uppdaterad: 2017-12-13
    2. Inducible nitric oxide synthase is expressed in synovial fluid granulocytes
    Öppna denna publikation i ny flik eller fönster >>Inducible nitric oxide synthase is expressed in synovial fluid granulocytes
    2002 (Engelska)Ingår i: Clinical Experimental Immunology, ISSN 0009-9104, Vol. 130, s. 150-155Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    The objective of the study was to evaluate the NO-producing potential of synovial fluid (SF) cells. SF from 15 patients with arthritis was compared with blood from the same individuals and with blood from 10 healthy controls. Cellular expression of inducible nitric oxide synthase (iNOS) was analysed by flow cytometry. High-performance liquid chromatography was used to measure L-arginine and L-citrulline. Nitrite and nitrate were measured colourimetrically utilizing the Griess' reaction. Compared to whole blood granulocytes in patients with chronic arthritis, a prominent iNOS expression was observed in SF granulocytes (P < 0.001). A slight, but statistically significant, increase in iNOS expression was also recorded in lymphocytes and monocytes from SF. L-arginine was elevated in SF compared to serum (257 ± 78 versus 176 ± 65 µmol/l, P = 0.008), whereas a slight increase in L-citrulline (33 ± 11 versus 26 ± 9 µmol/l), did not reach statistical significance. Great variations but no significant differences were observed comparing serum and SF levels of nitrite and nitrate, respectively, although the sum of nitrite and nitrate tended to be elevated in SF (19.2 ± 20.7 versus 8,6 ± 6.5 µmol/l,P = 0.054). Synovial fluid leucocytes, in particular granulocytes, express iNOS and may thus contribute to intra-articular NO production in arthritis.

    Nyckelord
    arthritis, granulocytes, iNOS, nitric oxide
    Nationell ämneskategori
    Medicin och hälsovetenskap
    Identifikatorer
    urn:nbn:se:liu:diva-14586 (URN)10.1046/j.1365-2249.2002.01959.x (DOI)
    Tillgänglig från: 2007-08-27 Skapad: 2007-08-27 Senast uppdaterad: 2015-08-31
    3. Inducible nitric oxide synthase (NOS II) is constitutive in human neutrophils
    Öppna denna publikation i ny flik eller fönster >>Inducible nitric oxide synthase (NOS II) is constitutive in human neutrophils
    Visa övriga...
    2003 (Engelska)Ingår i: APMIS, ISSN 0903-4641, Vol. 111, nr 10, s. 963-968Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    The objective was to study the expression of inducible nitric oxide synthase (NOS II) in and NO production by human blood neutrophils and in in vivo exudated neutrophils. Cellular expression of NOS II was evaluated by flow cytometry in whole blood, in isolated blood neutrophils, and in neutrophils obtained by exudation in vivo into skin chambers. Neutrophil NOS II was also demonstrated by Western blotting. Uptake of 3H-labelled L-arginine was studied in vitro and NOS activity measured in a whole cell assay by the conversion of 3H-arginine to 3H-citrulline. In contrast to unseparated blood cells, NOS II was demonstrable both in isolated blood neutrophils and exudated cells. The failure to detect NOS II by flow cytometry in whole blood cells thus proved to be due to the quenching effect of hemoglobin. Western blotting revealed a 130 kD band corresponding to NOS II in isolated blood neutrophils, but detection was dependent on diisopropylfluorophosphate for proteinase inhibition. L-arginine was taken up by neutrophils, but enzymatic activity could not be demonstrated. We conclude that human neutrophils constitutively express NOS II, but that its demonstration by FITC-labelling is inhibited by hemoglobin-mediated quenching in whole blood samples.

    Nyckelord
    Inflammation, nitric oxide, iNOS, granulocytes
    Nationell ämneskategori
    Medicin och hälsovetenskap
    Identifikatorer
    urn:nbn:se:liu:diva-14587 (URN)10.1034/j.1600-0463.2003.1111008.x (DOI)
    Tillgänglig från: 2007-08-27 Skapad: 2007-08-27 Senast uppdaterad: 2015-08-31
    4. Oxidative activation of human neutrophils by type-1-collagen-coated particles is influenced by nitric oxide production and modulated by endogenous arginase
    Öppna denna publikation i ny flik eller fönster >>Oxidative activation of human neutrophils by type-1-collagen-coated particles is influenced by nitric oxide production and modulated by endogenous arginase
    2007 (Engelska)Ingår i: Journal of Leukocyte Biology, ISSN 0741-5400, E-ISSN 1938-3673Artikel i tidskrift (Refereegranskat) Submitted
    Nationell ämneskategori
    Medicin och hälsovetenskap
    Identifikatorer
    urn:nbn:se:liu:diva-14588 (URN)
    Tillgänglig från: 2007-08-27 Skapad: 2007-08-27 Senast uppdaterad: 2017-12-13
  • 2.
    Cedergren, Jan
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Follin, Per
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Infektionsmedicin. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Medicincentrum, Infektionskliniken i Östergötland.
    Forslund, Tony
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Lindmark, Maria
    Linköpings universitet, Institutionen för medicin och vård. Linköpings universitet, Hälsouniversitetet.
    Sundqvist, Tommy
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Skogh, Thomas
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Medicincentrum, Länskliniken för Reumatologi i Östergötland.
    Inducible nitric oxide synthase (NOS II) is constitutive in human neutrophils2003Ingår i: APMIS, ISSN 0903-4641, Vol. 111, nr 10, s. 963-968Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The objective was to study the expression of inducible nitric oxide synthase (NOS II) in and NO production by human blood neutrophils and in in vivo exudated neutrophils. Cellular expression of NOS II was evaluated by flow cytometry in whole blood, in isolated blood neutrophils, and in neutrophils obtained by exudation in vivo into skin chambers. Neutrophil NOS II was also demonstrated by Western blotting. Uptake of 3H-labelled L-arginine was studied in vitro and NOS activity measured in a whole cell assay by the conversion of 3H-arginine to 3H-citrulline. In contrast to unseparated blood cells, NOS II was demonstrable both in isolated blood neutrophils and exudated cells. The failure to detect NOS II by flow cytometry in whole blood cells thus proved to be due to the quenching effect of hemoglobin. Western blotting revealed a 130 kD band corresponding to NOS II in isolated blood neutrophils, but detection was dependent on diisopropylfluorophosphate for proteinase inhibition. L-arginine was taken up by neutrophils, but enzymatic activity could not be demonstrated. We conclude that human neutrophils constitutively express NOS II, but that its demonstration by FITC-labelling is inhibited by hemoglobin-mediated quenching in whole blood samples.

  • 3.
    Cedergren, Jan
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Forslund, Tony
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Sundqvist, Tommy
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Skogh, Thomas
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Inducible nitric oxide synthase is expressed in synovial fluid granulocytes2002Ingår i: Clinical Experimental Immunology, ISSN 0009-9104, Vol. 130, s. 150-155Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The objective of the study was to evaluate the NO-producing potential of synovial fluid (SF) cells. SF from 15 patients with arthritis was compared with blood from the same individuals and with blood from 10 healthy controls. Cellular expression of inducible nitric oxide synthase (iNOS) was analysed by flow cytometry. High-performance liquid chromatography was used to measure L-arginine and L-citrulline. Nitrite and nitrate were measured colourimetrically utilizing the Griess' reaction. Compared to whole blood granulocytes in patients with chronic arthritis, a prominent iNOS expression was observed in SF granulocytes (P < 0.001). A slight, but statistically significant, increase in iNOS expression was also recorded in lymphocytes and monocytes from SF. L-arginine was elevated in SF compared to serum (257 ± 78 versus 176 ± 65 µmol/l, P = 0.008), whereas a slight increase in L-citrulline (33 ± 11 versus 26 ± 9 µmol/l), did not reach statistical significance. Great variations but no significant differences were observed comparing serum and SF levels of nitrite and nitrate, respectively, although the sum of nitrite and nitrate tended to be elevated in SF (19.2 ± 20.7 versus 8,6 ± 6.5 µmol/l,P = 0.054). Synovial fluid leucocytes, in particular granulocytes, express iNOS and may thus contribute to intra-articular NO production in arthritis.

  • 4.
    Cedergren, Jan
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Forslund, Tony
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Sundqvist, Tommy
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Skogh, Thomas
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Intracellular oxidative activation in synovial fluid neutrophils from patients with rheumatoid arthritis but not from other arthritis patients2007Ingår i: Journal of Rheumatology, ISSN 0315-162X, E-ISSN 1499-2752, Vol. 34, nr 11, s. 2162-2170Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objective: To compare total and intracellular oxidative activation of blood and synovial fluid (SF) neutrophils from patients with rheumatoid arthritis (RA) and other arthritides with blood donor neutrophils.

    Methods: Peripheral blood and SF samples were obtained from 26 gonarthritis patients (13 RA, 13 non-RA) attending the rheumatology unit for therapeutic joint aspiration. Isolated neutrophils were stimulated by a formylated tripeptide (fMLF) or by microbeads coated with collagen-I. Formation of superoxide-anion-derived reactive oxygen species (ROS) was studied by luminol-enhanced chemiluminescence. Paired samples of blood and SF neutrophils from patients with active arthritis were compared with blood neutrophils from patients in remission and from 47 healthy blood donors.

    Results: SF neutrophils from patients with RA, but not from non-RA patients, showed high baseline intracellular ROS production. Blood neutrophils from arthritis patients in remission existed in a primed state as revealed by more rapid oxidative response after collagen-bead challenge and a more pronounced response after fMLF stimulation compared to healthy blood donors. Blood neutrophils from RA patients with ongoing gonarthritis, however, did not differ from healthy blood donors concerning oxidative activation, whereas blood neutrophils from non-RA patients with gonarthritis showed a significantly lower peak ROS production.

    Conclusions: A novel finding with pathogenetic implications in our study is that SF neutrophils from patients with RA, but not other arthritides, are activated and produce ROS intracellularly. This implies that synovial neutrophils in RA are engaged in the processing of endocytosed material.

  • 5.
    Cedergren, Jan
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Forslund, Tony
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Sundqvist, Tommy
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Medicinsk mikrobiologi. Linköpings universitet, Hälsouniversitetet.
    Skogh, Thomas
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet.
    Oxidative activation of human neutrophils by type-1-collagen-coated particles is influenced by nitric oxide production and modulated by endogenous arginase2007Ingår i: Journal of Leukocyte Biology, ISSN 0741-5400, E-ISSN 1938-3673Artikel i tidskrift (Refereegranskat)
  • 6.
    Kastbom, Alf
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Hjärt- och Medicincentrum, Reumatologiska kliniken i Östergötland.
    Klingberg, E
    University of Gothenburg, Sweden .
    Verma, Deepti
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för inflammationsmedicin. Linköpings universitet, Hälsouniversitetet.
    Carlsten, H
    University of Gothenburg, Sweden .
    Forsblad-dElia, H
    University of Gothenburg, Sweden .
    Wesamaa, J
    Örebro University Hospital, Sweden .
    Cedergren, Jan
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Hjärt- och Medicincentrum, Reumatologiska kliniken i Östergötland.
    Eriksson, Per
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Reumatologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Hjärt- och Medicincentrum, Reumatologiska kliniken i Östergötland.
    Söderkvist, P
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för cellbiologi. Linköpings universitet, Hälsouniversitetet.
    Genetic variants in CARD8 but not in NLRP3 are associated with ankylosing spondylitis2013Ingår i: Scandinavian Journal of Rheumatology, ISSN 0300-9742, E-ISSN 1502-7732, Vol. 42, nr 6, s. 465-468Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objectives: The NOD-like receptor family, pyrin domain-containing 3 (NLRP3) inflammasome is important for interleukin-1beta (IL-1 beta) processing as part of an innate immune response. Caspase recruitment domain family, member 8 (CARD8) is an inhibitor of nuclear factor kappa B (NF-kappa B) and possibly also a part of the NLRP3 inflammasome. The objective of this study was to evaluate one single nucleotide polymorphism (SNP) in CARD8 and three SNPs in NLRP3 in ankylosing spondylitis (AS) susceptibility and disease phenotype. less thanbrgreater than less thanbrgreater thanMethod: We recruited 492 AS patients from Southern Sweden fulfilling the modified New York criteria for AS, and assessed phenotypic characteristics from medical records and questionnaires. Patients with psoriasis or clinically overt inflammatory bowel disease (IBD) were excluded, as were patients without human leucocyte antigen B27 (HLA-B27). Three NLRP3 SNPs (rs35829419, rs4353135, and rs10733113) and one SNP in CARD8 (rs2043211) were genotyped by commercially available TaqMan assays, and the results compared at genotype and allele levels to those of 793 population-based controls. In a subgroup of the patients (n = 169), faecal calprotectin was assessed as a marker of subclinical intestinal inflammation. less thanbrgreater than less thanbrgreater thanResults: The minor allele (A) of CARD8-C10X (rs2043211) was associated with a decreased risk of AS in a dominant model [odds ratio (OR) 0.74, 95% confidence interval (CI) 0.54-0.94, p = 0.012] and at the allelic level (OR 0.81, 95% CI 0.68-0.97, p = 0.02), but was not associated with levels of faecal calprotectin. There was no association regarding NLRP3 SNPs and AS susceptibility, and none of the investigated SNPs were associated with iritis, anti-tumour necrosis factor (anti-TNF) therapy, or peripheral joint involvement. less thanbrgreater than less thanbrgreater thanConclusion: In a Swedish population, the minor allele of CARD8-C10X is associated with a decreased risk of AS, but not with levels of faecal calprotectin or disease phenotype.

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