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- Nordmark, G., et al.
(författare)
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Association of Genes in the NF-kappa B Pathway with Antibody-Positive Primary Sjogren's Syndrome
- 2013
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Ingår i: Scandinavian Journal of Immunology. - : Wiley. - 0300-9475 .- 1365-3083. ; 78:5, s. 447-454
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Tidskriftsartikel (refereegranskat)abstract
- Primary Sjogren's syndrome (SS) is a systemic autoimmune inflammatory disease characterized by focal lymphocytic infiltrates in the lachrymal and salivary glands and autoantibodies against the SSA/Ro and SSB/La antigens. Experimental studies have shown an activation of NF-B in primary SS. NF-B activation results in inflammation and autoimmunity and is regulated by inhibitory and activating proteins. Genetic studies have shown an association between multiple autoimmune diseases and TNFAIP3 (A20) and TNIP1 (ABIN1), both repressors of NF-B and of IKBKE (IKK epsilon), which is an NF-B activator. The aim of this study was to analyse single nucleotide polymorphisms (SNPs) in the IKBKE, NFKB1, TNIP1 and TNFAIP3 genes for association with primary SS. A total of 12 SNPs were genotyped in 1105 patients from Scandinavia (Sweden and Norway, n=684) and the UK (n=421) and 4460 controls (Scandinavia, n=1662, UK, n=2798). When patients were stratified for the presence of anti-SSA and/or anti-SSB antibodies (n=868), case-control meta-analysis found an association between antibody-positive primary SS and two SNPs in TNIP1 (P=3.4x10(-5), OR=1.33, 95%CI: 1.16-1.52 for rs3792783 and P=1.3x10(-3), OR=1.21, 95%CI: 1.08-1.36 for rs7708392). A TNIP1 risk haplotype was associated with antibody-positive primary SS (P=5.7x10(-3), OR=1.47, 95%CI: 1.12-1.92). There were no significant associations with IKBKE, NFKB1 or TNFAIP3 in the meta-analysis of the Scandinavian and UK cohorts. We conclude that polymorphisms in TNIP1 are associated with antibody-positive primary SS.
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| 2. |
- Crisci, E., et al.
(författare)
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Complement Opsonization Promotes Herpes Simplex Virus 2 Infection of Human Dendritic Cells
- 2016
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Ingår i: Journal of Virology. - : American Society for Microbiology. - 0022-538X .- 1098-5514. ; 90:10, s. 4939-4950
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Tidskriftsartikel (refereegranskat)abstract
- Herpes simplex virus 2 (HSV-2) is one of the most common sexually transmitted infections globally, with a very high prevalence in many countries. During HSV-2 infection, viral particles become coated with complement proteins and antibodies, both present in genital fluids, which could influence the activation of immune responses. In genital mucosa, the primary target cells for HSV-2 infection are epithelial cells, but resident immune cells, such as dendritic cells (DCs), are also infected. DCs are the activators of the ensuing immune responses directed against HSV-2, and the aim of this study was to examine the effects opsonization of HSV-2, either with complement alone or with complement and antibodies, had on the infection of immature DCs and their ability to mount inflammatory and antiviral responses. Complement opsonization of HSV-2 enhanced both the direct infection of immature DCs and their production of new infectious viral particles. The enhanced infection required activation of the complement cascade and functional complement receptor 3. Furthermore, HSV-2 infection of DCs required endocytosis of viral particles and their delivery into an acid endosomal compartment. The presence of complement in combination with HSV-1- or HSV-2-specific antibodies more or less abolished HSV-2 infection of DCs. Our results clearly demonstrate the importance of studying HSV-2 infection under conditions that ensue in vivo, i.e., conditions under which the virions are covered in complement fragments and complement fragments and antibodies, as these shape the infection and the subsequent immune response and need to be further elucidated. During HSV-2 infection, viral particles should become coated with complement proteins and antibodies, both present in genital fluids, which could influence the activation of the immune responses. The dendritic cells are activators of the immune responses directed against HSV-2, and the aim of this study was to examine the effects of complement alone or complement and antibodies on HSV-2 infection of dendritic cells and their ability to mount inflammatory and antiviral responses. Our results demonstrate that the presence of antibodies and complement in the genital environment can influence HSV-2 infection under in vitro conditions that reflect the in vivo situation. We believe that our findings are highly relevant for the understanding of HSV-2 pathogenesis.
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| 8. |
- Gomez, A., et al.
(författare)
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LOW-DOSE BELIMUMAB AND ANTIMALARIAL AGENTS PREVENT RENAL FLARES IN SYSTEMIC LUPUS ERYTHEMATOSUS : RESULTS FROM FOUR RANDOMISED CLINICAL TRIALS
- 2023
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Ingår i: Annals of the Rheumatic Diseases. - : HighWire Press. - 0003-4967 .- 1468-2060. ; 82:Suppl. 1, s. 1467-1468
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Background: Lupus nephritis (LN) is one of the most severe manifestations in systemic lupus erythematosus (SLE), constituting a substantial cause of end-stage kidney disease, dialysis, and mortality. Prompt and adequate treatment of LN, and prevention of renal flares are key components of disease management towards improved outcomes in patients with SLE.Objectives: We aimed to determine the effect of the use of antimalarial agents (AMA) and different doses and pharmaceutical forms of belimumab on preventing renal flares in patients with active SLE.Methods: We pooled data from the BLISS-52, BLISS-76, BLISS-SC and BLISS-Northeast Asia randomised clinical trials of belimumab (N=3225), that included patients with seropositive (antinuclear antibody titres ≥1:80 and/or anti-dsDNA levels ≥30 IU/mL), active SLE yet no severe ongoing renal disease. Participants were allocated to receive intravenous (IV) belimumab 1 mg/kg (N=559), IV belimumab 10 mg/kg (N=1033), subcutaneous (SC) belimumab 200 mg (N=556) or placebo (N=1077) in addition to standard therapy. Additionally, we classified patients as AMA users if they had received hydroxychloroquine, chloroquine, mepacrine, or quinine sulphate in stable doses for at least 30 days prior to the trial commencement. The outcome of the present post-hoc analysis was development of renal flares, defined according to the analysis plan within the BLISS programme. The hazard of renal flare was assessed with Cox proportional hazards regression models, adjusted for age, sex, ethnicity, previous renal involvement, baseline proteinuria and glomerular filtration rate, and use of glucocorticoids and immunosuppressants.Results: In total, 192 patients developed a renal flare after a median of 197 days. In multivariable Cox regression analysis, use of AMA was associated with a lower risk of renal flares (HR: 0.64; 95% CI: 0.54–0.96; p=0.026). Compared with placebo, the risk of renal flares was lower among patients receiving IV belimumab 1 mg/kg (HR: 0.44; 95% CI: 0.25–0.79; p=0.006) and IV belimumab 10 mg/kg (HR: 0.63; 95% CI: 0.45–0.87; p=0.005), but not SC belimumab 200 mg (HR: 0.90; 95% CI: 0.57–1.42; p=0.648). When analysing all study arms with and without antimalarials separately, patients receiving IV belimumab 1 mg/kg along with AMA experienced the lowest rate of renal flares (18.5 (7.4–38.1) cases per 1000 person-years). Using patients who received placebo but not AMA as the reference comparator, patients receiving IV belimumab 1 mg/kg (OR: 0.30; 95% CI: 0.13–0.70; p=0.005) and patients receiving IV belimumab 10 mg (OR: 0.45; 95% CI: 0.27–0.75; p=0.002) were protected against renal flares only when belimumab use was combined with AMA.Conclusion: In this RCT setting, belimumab and AMA protected against renal flares in patients with active seropositive SLE yet no ongoing severe renal involvement. The protective effect of IV belimumab against renal flares appeared optimal when belimumab was combined with AMA. The prominent effect of low-dose belimumab motivates investigation of the efficacy of intermediate doses of belimumab.
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