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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Correlation between intracellular interferon-gamma (IFN-gamma) production by CD4+ and CD8+ lymphocytes and IFN-gamma gene polymorphism in patients with type 2 diabetes mellitus and latent autoimmune diabetes of adults (LADA).

IFN-gamma is considered to be involved in the pathogenesis of diabetes mellitus. In this study, the presence of T/A mutation at position -874 in IFN-gamma gene was assessed in patients with latent autoimmune diabetes of adults (LADA), in patients with type 2 diabetes and in healthy individuals. Subsequently, an attempt was made to correlate the presence of this mutation with the ability of CD4+ or CD8+ lymphocytes from these individuals to release IFN-gamma following mitogenic stimulation. There were no significant differences in the distribution of genotypes and haplotypes in the three study groups. However, the frequency of the low IFN-gamma production allele (IFN-gamma 874( *)A) was significantly higher in type 2 diabetics compared to controls. CD4+ and CD8+ cells obtained from type 2 diabetics released significantly lower amounts of IFN-gamma in the intracellular space, compared to those released by cells obtained from LADA patients and healthy volunteers. Furthermore, even CD4+ and CD8+ from type 2 diabetics bearing the TT genotype (high producers) released significantly lower amounts of IFN-gamma than LADA patients carrying the same genotype, probably due to the activity of molecules directly or indirectly inhibiting IFN-gamma production. The results of this study indicate that IFN-gamma may contribute to the development of type 2 diabetes, based on a combination of molecular and immunological observations.[1]

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