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Sökning: WFRF:(Hultqvist Malin)

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  • Ahlqvist, Emma, et al. (författare)
  • High-resolution mapping of a complex disease, a model for rheumatoid arthritis, using heterogeneous stock mice
  • 2011
  • Ingår i: Human Molecular Genetics. - Oxford University Press. - 0964-6906. ; 20:15, s. 3031-3041
  • Tidskriftsartikel (refereegranskat)abstract
    • Resolving the genetic basis of complex diseases like rheumatoid arthritis will require knowledge of the corresponding diseases in experimental animals to enable translational functional studies. Mapping of quantitative trait loci in mouse models of arthritis, such as collagen-induced arthritis (CIA), using F-2 crosses has been successful, but can resolve loci only to large chromosomal regions. Using an inbred-outbred cross design, we identified and fine-mapped CIA loci on a genome-wide scale. Heterogeneous stock mice were first intercrossed with an inbred strain, B10.Q, to introduce an arthritis permitting MHCII haplotype. Homozygous H2(q) mice were then selected to set up an F-3 generation with fixed major histocompatibility complex that was used for arthritis experiments. We identified 26 loci, 18 of which are novel, controlling arthritis traits such as incidence of disease, severity and time of onset and fine-mapped a number of previously mapped loci.
  • Ahlqvist, Emma, et al. (författare)
  • The value of animal models in predicting genetic susceptibility to complex diseases such as rheumatoid arthritis.
  • 2009
  • Ingår i: Arthritis Research and Therapy. - BioMed Central (BMC). - 1478-6362. ; 11:3
  • Tidskriftsartikel (refereegranskat)abstract
    • ABSTRACT: For a long time, genetic studies of complex diseases were most successfully conducted in animal models. However, the field of genetics is now rapidly evolving, and human genetics has also started to produce strong candidate genes for complex diseases. This raises the question of how to continue gene-finding attempts in animals and how to use animal models to enhance our understanding of gene function. In this review we summarize the uses and advantages of animal studies in identification of disease susceptibility genes, focusing on rheumatoid arthritis. We are convinced that animal genetics will remain a valuable tool for the identification and investigation of pathways that lead to disease, well into the future.
  • Carlsén, Stefan, et al. (författare)
  • Cartilage oligomeric matrix protein induction of chronic arthritis in mice.
  • 2008
  • Ingår i: Arthritis and Rheumatism. - John Wiley and Sons Inc.. - 1529-0131. ; 58:7, s. 2000-2011
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE: To develop a new mouse model for arthritis using cartilage oligomeric matrix protein (COMP) and to study the role of major histocompatibility complex (MHC) and Ncf1 genes in COMP-induced arthritis (COMPIA). METHODS: Native (pentameric) and denatured (monomeric) COMP purified from a rat chondrosarcoma was injected into mice with Freund's adjuvant to induce arthritis. C3H.NB, C3H.Q, B10.P, B10.Q, (B10.Q x DBA/1)F(1), (BALB/c x B10.Q)F(1), Ncf1 mutated, H-2A(q), H-2A(p), and human DR4+-transgenic mice were used. Anti-COMP antibodies and COMP levels in the immune sera were analyzed, and passive transfer of arthritis with purified immune sera was tested. RESULTS: Immunization with rat COMP induced a severe, chronic, relapsing arthritis, with a female preponderance, in the mice. The disease developed in C3H.NB mice, but not in B10.P mice, although they share the same MHC haplotype. Both H-2(q) and H-2(p) MHC haplotypes allowed the initiation of COMPIA. Using H-2A(q)-transgenic and H-2A(p)-transgenic mice, we demonstrated a role of both the A(q) and E(p) class II molecules in this model. Interestingly, the introduction of a mutation in the Ncf1 gene, which is responsible for the reduced oxidative burst phenotype, into the COMPIA-resistant B10.Q mouse strain rendered them highly susceptible to arthritis. In addition, the transfer of anti-COMP serum was found to induce arthritis in naive mice. Mice transgenic for the rheumatoid arthritis (RA)-associated DR4 molecule were found to be highly susceptible to COMPIA. CONCLUSION: Using rat COMP, we have developed a new and unique mouse model of chronic arthritis that resembles RA. This model will be useful as an appropriate and alternative model for studying the pathogenesis of RA.
  • Forster, Michael, et al. (författare)
  • Genetic control of antibody production during collagen-induced arthritis development in heterogeneous stock mice
  • 2012
  • Ingår i: Arthritis and Rheumatism. - John Wiley and Sons Inc.. - 1529-0131. ; 64:11, s. 3594-3603
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective. To identify genetic factors driving pathogenic autoantibody formation in collagen-induced arthritis (CIA), a mouse model of rheumatoid arthritis (RA), in order to better understand the etiology of RA and identify possible new avenues for therapeutic intervention. Methods. We performed a genome-wide analysis of quantitative trait loci controlling autoantibody to type II collagen (anti-CII), anti-citrullinated protein antibody (ACPA), and rheumatoid factor (RF). To identify loci controlling autoantibody production, we induced CIA in a heterogeneous stock-derived mouse cohort, with contribution of 8 inbred mouse strains backcrossed to C57BL/10. Q. Serum samples were collected from 1,640 mice before arthritis onset and at the peak of the disease. Antibody concentrations were measured by standard enzyme-linked immunosorbent assay, and linkage analysis was performed using a linear regression-based method. Results. We identified loci controlling formation of anti-CII of different IgG isotypes (IgG1, IgG3), antibodies to major CII epitopes (C1, J1, U1), antibodies to a citrullinated CII peptide (citC1), and RF. The anti-CII, ACPA, and RF responses were all found to be controlled by distinct genes, one of the most important loci being the immunoglobulin heavy chain locus. Conclusion. This comprehensive genetic analysis of autoantibody formation in CIA demonstrates an association not only of anti-CII, but interestingly also of ACPA and RF, with arthritis development in mice. These results underscore the importance of non-major histocompatibility complex genes in controlling the formation of clinically relevant autoantibodies.
  • Hagenow, Kristin, et al. (författare)
  • Ncf1-Associated Reduced Oxidative Burst Promotes IL-33R+ T Cell-Mediated Adjuvant-Free Arthritis in Mice.
  • 2009
  • Ingår i: Journal of Immunology. - American Association of Immunologists. - 1550-6606. ; 183:2, s. 874-881
  • Tidskriftsartikel (refereegranskat)abstract
    • Reactive oxygen species (ROS) are important in the immune defense against invading pathogens, but they are also key molecules in the regulation of inflammatory reactions. Low levels of ROS production due to a polymorphism in the neutrophil cytosolic factor 1 (Ncf1) gene are associated with autoimmunity and arthritis severity in mouse models induced with adjuvant. We established an adjuvant-free arthritis model in which disease is induced by injection of the autoantigen collagen type II (CII) and depends on IL-5-producing T cells and eosinophils. In addition, the transgenic expression of mutated mouse CII allowed us to investigate an autoreactive immune response to an autologous Ag and by that natural tolerance mechanism. We show that a deficient ROS production, due to a spontaneous mutation in Ncf1, leads to increased autoantibody production and expansion of IL-33R-expressing T cells, impaired T cell tolerance toward tissue-specific CII, and severe arthritis in this unique model without disturbing adjuvant effects. These results demonstrate that the insufficient production of ROS promotes the breakdown of immune tolerance and development of autoimmune and adjuvant-free arthritis through an IL-5- and IL33R-dependent T cell activation pathway.
  • Huberle, Alexander, et al. (författare)
  • Advanced Intercross Line Mapping Suggests That Ncf1 (Ean6) Regulates Severity in an Animal Model of Guillain-Barre Syndrome
  • 2009
  • Ingår i: Journal of Immunology. - American Association of Immunologists. - 1550-6606. ; 182:7, s. 4432-4438
  • Tidskriftsartikel (refereegranskat)abstract
    • We here present the first genetic fine mapping of experimental autoimmune neuritis (EAN), the animal model of Guillain-Barre syndrome, in a rat advanced intercross line. We identified and refined a total of five quantitative trait loci on rat chromosomes 4, 10, and 12 (RNO4, RNO10, RNO12), showing linkage to splenic IFN-gamma secretion and disease severity. All quantitative trait loci were shared with other models of complex inflammatory diseases. The quantitative trait locus showing strongest linkage to clinical disease was Ean6 and spans 4.3 Mb on RNO12, harboring the neutrophil cytosolic factor 1 (Ncf1) among other genes. Polymorphisms in Ncf1, a member of the NADPH oxidase complex, have been associated with disease regulation in experimental arthritis and encephalomyelitis. We therefore tested the Ncf1 pathway by treating rats with a NADPH oxidase complex activator and ameliorated EAN compared the oil-treated control group. By proving the therapeutic effect of stimulating the NADPH oxidase complex, our data strongly suggest the first identification of a gene regulating peripheral nervous system inflammation. Taken together with previous reports, our findings suggest a general role of Ncf1 and oxidative burst in pathogenesis of experimental autoimmune animal models. The Journal of Immunology, 2009, 182: 4432-4438.
  • Hultqvist, Malin, et al. (författare)
  • Positioning of a Polymorphic Quantitative Trait Nucleotide in the Ncf1 Gene Controlling Oxidative Burst Response and Arthritis Severity in Rats.
  • 2011
  • Ingår i: Antioxidants & Redox Signaling. - Mary Ann Liebert, Inc.. - 1557-7716. ; 14:12, s. 2373-2383
  • Tidskriftsartikel (refereegranskat)abstract
    • The Ncf1 gene, encoding the P47PHOX protein that regulates production of reactive oxygen species (ROS) by the phagocyte NADPH oxidase complex, is associated with autoimmunity and arthritis severity in rats. We have now identified that the single nucleotide polymorphism (SNP) resulting in an M153T amino acid substitution mediates arthritis resistance and thus explains the molecular polymorphism underlying the earlier identified Ncf1 gene effect. We identified the SNP in position 153 to regulate ROS production using COSPHOX cells transfected with mutated Ncf1. To determine the role of this SNP for control of arthritis we used the Wistar strain, identified to carry only the postulated arthritis resistant SNP in position 153. When this Ncf1 allele was backcrossed to the arthritis susceptible DA strain, both granulocyte ROS production and arthritis resistance was restored. Position 153 is located in the hinge region between the PX and SH3 domains of P47PHOX. Mutational analysis of this position revealed a need for an -OH group in the side chain but we found no evidence for phosphorylation. The polymorphism did not affect assembly of the P47PHOX/P67PHOX complex in the cytosol nor membrane localization but is likely to operate downstream of assembly, affecting activity of the membrane NOX2 complex.
  • Hultqvist, Malin, et al. (författare)
  • Rabeximod reduces arthritis severity in mice by decreasing activation of inflammatory cells.
  • 2010
  • Ingår i: Annals of the Rheumatic Diseases. - British Medical Association. - 1468-2060. ; Jul 1, s. 1527-1532
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVES: /st> The novel small molecule 9-chloro-2,3-dimethyl-6-(N,N-dimethylaminoethylamino-2-oxoethyl)-6H-indolo[2,3-b] quinoxaline (Rabeximod) reduces severity of arthritis in rodent models of rheumatoid arthritis (RA) and multiple sclerosis (MS). This study aimed to investigate the cellular target in vivo. METHODS: /st> Collagen antibody-induced arthritis (CAIA) is induced by monoclonal collagen type II antibodies and enhanced by lipopolysaccharide. It was investigated how and when Rabeximod operates on inflammatory cells after stimulation of either Toll-like receptor (TLR)4 (lipopolysaccharide) or TLR2 (lipomannan) in mice lacking functional signalling through TLR4 due to a spontaneous deletion of the Tlr4 gene. RESULTS: /st> Rabeximod efficiently prevented arthritis during the time window when TLR2 or TLR4 ligands activate inflammatory macrophages. The effect operated downstream of TLR activation as Rabeximod was highly therapeutic in CAIA enhanced through TLR2 stimuli in TLR4 deficient mice. In addition, it was found that the arthritis ameliorating effect of Rabeximod was time dependent, since inhibition of tumour necrosis factor alpha production from macrophages in vitro was more pronounced if administered close to stimulation. CONCLUSIONS: /st> Rabeximod suppresses arthritis by preventing activation of inflammatory cells, most likely macrophages, in a time dependent fashion, downstream of TLR2 and TLR4 stimulation.
  • Hultqvist, Malin, et al. (författare)
  • The novel small molecule drug Rabeximod is effective in reducing disease severity of mouse models of autoimmune disorders
  • 2009
  • Ingår i: Annals of the Rheumatic Diseases. - British Medical Association. - 1468-2060. ; 68:1, s. 130-135
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives: Autoimmune diseases such as rheumatoid arthritis (RA) and multiple sclerosis (MS) affect a relatively large portion of the population, leading to severe disability if left untreated. Even though pharmaceutics targeting the immune system have revolutionised the therapy of these diseases, there is still a need for novel, more effective therapeutic substances. One such substance is the new chemical entity 9-chloro-2,3 dimethyl-6-(N, N-dimthylamino-2-oxoethyl)-6H-indolo [2,3-b] quionoxaline, Rabeximod, currently being investigated for efficiency in treatment of human RA. In this study we aimed to evaluate Rabeximod as a treatment for autoimmune diseases, using animal models. Methods: In the present investigation we have evaluated Rabeximod as a treatment for autoimmune diseases using mouse models of RA and MS, ie, collagen-induced arthritis, collagen antibody induced arthritis and experimental autoimmune encephalomyelitis. Results: Rabeximod efficiently prevented arthritis and encephalomyelitis in mice. In addition, this effect correlated to the timepoint when cells migrate into the joints. Conclusions: We conclude that Rabeximod reduces disease severity in animal models of autoimmunity and should be considered as a new therapeutic substance for MS and RA.
  • Hultqvist, Malin, et al. (författare)
  • The protective role of ROS in autoimmune disease.
  • 2009
  • Ingår i: Trends in Immunology. - Elsevier. - 1471-4981. ; 30, s. 201-208
  • Tidskriftsartikel (refereegranskat)abstract
    • For a long time, reactive oxygen species (ROS) produced by the phagocyte NADPH oxidase (NOX2) complex have been considered harmful mediators of inflammation owing to their highly reactive nature. However, there are an increasing number of findings suggesting that ROS produced by the NOX2 complex are anti-inflammatory and prevent autoimmune responses, thus challenging existing dogma. ROS might not only be produced as a mechanism to eradicate invading pathogens, but rather as a means by which to fine-tune the inflammatory response, depending on when, where and at what amounts they are produced. In this review, we aim to describe the current findings highlighting ROS as regulators of autoimmune inflammation, focusing on autoimmune arthritis.
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