| Summary: | <p>Abstract</p> <p>Background</p> <p>Interleukin 6 (IL-6) is thought to play important roles in the development of reactive thrombocytosis caused by inflammation by its stimulatory effect on megakaryocytopoiesis. A G/C polymorphism of the IL-6 gene at position -174 has been found to be associated to different transcription rates. Specifically, subjects with the CC genotype showed lower plasma IL-6 levels compared with GC or GG subjects. Given this difference in transcription rates of IL-6 we speculated on different platelet count according to this IL-6 polymorphism.</p> <p>Methods</p> <p>The G/C polymorphism of the <it>IL-6</it> gene at position -174, serum IL-6 concentration and platelet count were prospectively analyzed in 59 (25 women) consecutive healthy subjects.</p> <p>Results</p> <p>Subjects who were homozygotes for the C allele at position -174 of the <it>IL-6</it> gene (Sfa NI genotype) showed significantly lower platelet count than carriers of the G allele, despite similar age, sex, body mass index and proportion of smokers (205400 ± 44088 vs 239818 ± 60194, p = 0.047). This was in parallel to differences in peripheral white blood cell count (5807 ± 1671 vs 6867 ± 1192 × 10<sup>9</sup>/ml, p = 0.01).</p> <p>Conclusion</p> <p>This is the first description, to our knowledge, of a genetical influence on basal platelet counts, which appears to be partially dependent on a polymorphism of the <it>IL-6</it> gene, even in the absence of inflammation.</p>
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