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Träfflista för sökning "L773:0012 186X OR L773:1432 0428 srt2:(2000-2004)"

Sökning: L773:0012 186X OR L773:1432 0428 > (2000-2004)

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  • Antonelli, A, et al. (författare)
  • Autoimmunity to CD38 and GAD in Type I and Type II diabetes: CD38 and HLA genotypes and clinical phenotypes
  • 2002
  • Ingår i: Diabetologia. - : Springer Science and Business Media LLC. - 1432-0428 .- 0012-186X. ; 45:9, s. 1298-1306
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims/hypothesis. Autoantibodies against CD38 have been found in some patients with Type II (non-insulin-dependent) diabetes mellitus and have been shown to stimulate insulin secretion by cultured human islets. We tested whether this new form of autoimmunity, (i) overlaps with anti-GAD autoimmunity, (ii) identifies an insulin-deficient phenotype, (iii) is under the influence of genetic factors. Methods. We screened 496 adults by immuno-blot analysis in the Botnia Study (298 with Type II and 98 with Type I (insulin-dependent) diabetes mellitus, 100 non-diabetic control subjects). Results. CD38-autoantibodies were found in 8.4% of Type II diabetic patients (p<0.003 vs 0% of control subjects), particularly in anti-GAD positive (14% vs 6% of anti-GAD negative, p=0.0004). CD38ab were also found in 4% of Type I diabetic patients; in the whole study group, 59% of anti-CD38 positive had DQB1 *02 compared with 38% of anti-CD38 negative (p=0.04). On the OGTT, beta-cell function (as the ratio of insulin-to-glucose areas) was impaired (p=0.02) only in association with anti-GAD positivity (3.2 +/- 3.1 U/mol, mean +/- SD) but not in anti-CD38 positive patients (5.6 +/- 2.9) as compared with patients free of autoimmunity (4.5 +/- 4.6, p=NS). In 44 Type II diabetic patients (22 negative and 22 positive for anti-CD38), no mutations were detected in any of the 8 exons, 5' end of intron 1 or the 5' and 3' untranslated regions of the CD38 gene. The previously described missense mutation (Arg140Trp) in exon 3 was not found in this cohort. There was no association between the PvUII polymorphism and clinical phenotype. Conclusion. Anti-CD38 autoimmunity identifies a clinical phenotype similar to non-autoimmune Type II diabetes, with relative preserved beta-cell function and weak genetic influence.
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  • Bergman, Marie-Louise, et al. (författare)
  • Low rate of proliferation in immature thymocytes of the non-obese diabetic mouse maps to the Idd6 diabetes susceptibility region
  • 2001
  • Ingår i: Diabetologia. - : Springer. - 0012-186X .- 1432-0428. ; 44:8, s. 1054-1061
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims/hypothesis: The non-obese diabetic (NOD) mouse spontaneously develops T-cell-dependent autoimmune diabetes. This mouse strain has a number of immune dysfunctions related to T-cell development but so far there are no available data on the proliferation of NOD immature thymocytes. We therefore studied the thymocyte proliferation in the NOD mouse in discrete stages of T-cell development.Methods: We depleted thymocytes in vivo and analysed thymocyte proliferation during the thymus recovery from depletion. We used co-segregation analysis and quantitative loci trait analysis to investigate the genetic control of proliferation impairments in NOD thymocytes.Results: Immature thymocytes of female NOD mice proliferate with a relatively low rate compared to non-autoimmune C57Bl/6 mice. This aberrant proliferation was most pronounced in CD4– /loCD8+ cells differentiating from the CD4–CD8– to the CD4+CD8+ stage. A genetic mapping study using an F2 intercross between the NOD and the C57BL/6 strains showed that a major locus controlling this trait is linked to the insulin-dependent diabetes susceptibility locus Idd6.Conclusion/interpretation: Our results suggest that impairment of proliferation of immature thymocytes is one possible mechanism through which the Idd6 locus contributes to the pathogenesis of diabetes.
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