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| 2. |
- Berglund, Martin, 1979, et al.
(författare)
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Toll-like receptor cross-hyporesponsiveness is functional in interleukin-1-receptor-associated kinase-1 (IRAK-1)-deficient macrophages : differential role played by IRAK-1 in regulation of tumour necrosis factor and interleukin-10 production
- 2008
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Ingår i: Scandinavian Journal of Immunology. - : Wiley. - 0300-9475 .- 1365-3083. ; 67:5, s. 473-479
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Tidskriftsartikel (refereegranskat)abstract
- Signalling downstream Toll-like receptors (TLR) is regulated at several levels in order to activate the immune response and prevent excessive inflammation. Altered intracellular signalling may be one reason that repeated stimulation of various TLRs results in hyporesponsiveness and cross-tolerance. We report that TLR cross-tolerance is inducible in the absence of interleukin-1 receptor-associated kinase-1 (IRAK-1) in peritoneal macrophages. Similar to wild-type macrophages, IRAK-1-deficient macrophages respond with decreased tumour necrosis factor (TNF) production to a secondary TLR stimulation, but in opposite to IRAK-1(+/+), IRAK-1(-/-) macrophages display increased interleukin (IL)-10 production at TLR restimulation. IRAK-1-deficient peritoneal macrophages have a defective TNF and IL-10 production in response to lipoteichoic acid stimulation as well as a defective IL-10-but a normal TNF production in response to high concentration of lipopolysaccharide. Our results demonstrate that IRAK-1 is not necessary for induction of TLR cross-tolerance as judged by TNF production.
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| 3. |
- Nasr, Amre, et al.
(författare)
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Fc gamma receptor IIa (CD32) polymorphism and antibody responses to asexual blood-stage antigens of Plasmodium falciparum malaria in Sudanese patients
- 2007
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Ingår i: Scandinavian Journal of Immunology. - Oxford : Blackwell Science. - 0300-9475 .- 1365-3083. ; 66:1, s. 87-96
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Tidskriftsartikel (refereegranskat)abstract
- In a prospective clinical study in New Halfa Teaching Hospital, the possible association between FcRIIa-R/H131 polymorphism and anti-malarial antibody responses with clinical outcome of Plasmodium falciparum malaria among Sudanese patients was investigated. A total of 256 individuals were consecutively enrolled, comprising 115 patients with severe malaria, 85 with mild malaria and 56 malaria-free controls. Genotyping of FcRIIa-R/H131 dimorphism was performed using gene-specific polymerase chain reaction (PCR) amplification with allele-specific restriction enzyme digestion of the PCR product. The antibody responses to asexual blood-stage antigens were assessed by an enzyme-linked immunosorbent assay. The frequency of the FcRIIa-R/R131 genotype was significantly higher in those with severe malaria when compared with patients with mild malaria, while the FcRIIa-H/H131 genotype showed a significant association with mild malaria. A reduced risk of severe malaria with IgG3 antibodies in combination with the H/H131 genotype was observed. Furthermore, low levels of IgG2 antibodies reactive with the Pf332-C231 antigen were also associated with lower risk of severe malaria in individuals carrying the H131 allele. The levels of IgG1 and IgG3 antibodies were statistically significantly higher in the mild malaria patients when compared with the severe malaria patients. Taken together, our study revealed that the FcRIIa-R/R131 genotype is associated with the development of severe malaria, while the H/H131 genotype is more likely to be associated with mild malaria. Our results also revealed that the natural acquisition of immunity against clinical malaria appeared to be more associated with IgG1 and IgG3 antibodies, signifying their roles in parasite-neutralizing immune mechanisms.
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- Almroth, Gabriel, et al.
(författare)
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Fibroblast Growth Factor 23, Hepatocyte Growth Factor, Interleukin-6, High-Sensitivity C-Reactive Protein and Soluble Urokinase Plasminogen Activator Receptor. Inflammation Markers in Chronic Haemodialysis Patients?
- 2013
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Ingår i: Scandinavian Journal of Immunology. - : Wiley-Blackwell. - 0300-9475 .- 1365-3083. ; 78:3, s. 285-290
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Tidskriftsartikel (refereegranskat)abstract
- Sera from 84 haemodialysis (HD) patients and 68 healthy blood donors were analysed with commercially available ELISA techniques for fibroblast growth factor 23 (FGF-23), hepatocyte growth factor (HGF), interleukin-6 (Il-6), high-sensitivity C-reactive protein (hs-CRP) and soluble urokinase plasminogen activator receptor (suPAR), to find a possible correlation of FGF-23 and HGF with the earlier recognized inflammatory markers Il-6 and hs-CRP or suPAR. All patients studied had significantly elevated levels of FGF-23, HGF, hs-CRP and suPAR as compared to the controls. Il-6 and hs-CRP correlated for patients (R=0.6) as well as for patients and controls altogether. Ln (natural logarithm) of HGF correlated weakly with Ln Il-6 and Ln CRP (R 0.28-0.37). Ln FGF-23 correlated only with Ln HGF (r=-0.25) in controls. Ln HGF correlated with ln suPAR (r=0.6) in both patients and controls. Although elevated as compared to controls, we found no correlation of FGF-23 with the recognized inflammatory markers Il-6, hs-CRP, nor HGF or the new marker suPAR in HD patients. Ln HGF correlated with Ln Il-6, Ln CRP and Ln suPAR. Although probably involved in vessel disease, FGF-23 and HGF may play other roles than acting in inflammatory vessel disease in HD patients. Further studies are necessary to evaluate the role of these immunological markers in chronic haemodialysis patients with atherosclerosis.
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| 5. |
- Almroth, Gabriel, et al.
(författare)
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Sclerostin, TNF-alpha and Interleukin-18 Correlate and are Together with Klotho Related to Other Growth Factors and Cytokines in Haemodialysis Patients
- 2016
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Ingår i: Scandinavian Journal of Immunology. - : Wiley-Blackwell. - 0300-9475 .- 1365-3083. ; 83:1, s. 58-63
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Tidskriftsartikel (refereegranskat)abstract
- Patients with chronic renal failure are known to have renal osteodystrophy (bone disease) and increased calcification of vessels. A new marker of bone disease, sclerostin, the two pro-inflammatory cytokines tumour necrosis factor-alpha (TNF-alpha) and interleukin-18 (IL-18), and the fibroblast growth factor-23 (FGF-23) receptor-associated marker Klotho were tested in 84 haemodialysis (HD) patients and in healthy controls. The patients had significantly higher levels of the three former markers than of the controls while Klotho was significantly higher in the controls. Low level, but significant, correlations were observed in the patient group when the levels of these four markers were compared to each other and to those of 5 cytokines and growth factors tested earlier; high-sensitive CRP (hsCRP), interleukin-6 (IL-6), hepatocyte growth factor (HGF), fibroblast growth factor-23 (FGF-23) and soluble urokinase plasminogen activator (suPAR). Ln sclerostin correlated positively to Ln hsTNF-alpha, Ln HGF and Ln suPAR. Ln hsTNF-alpha correlated positively to Ln sclerostin, Ln hsCRP, Ln IL-6, Ln FGF-23, Ln suPAR and Ln IL-18. Ln IL-18 correlated positively to Ln suPAR and Ln TNF-alpha. Ln Klotho correlated negatively to Ln hsCRP but did not correlate to Ln FGF-23. The markers studied here may be involved in the calcification of vessels seen in HD patients due to a combination of inflammation and bone disease. The mechanisms are still not fully known but may be of importance for future therapeutic possibilities in this group of patients.
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