title: Synchronous fluctuation of interleukin-6 and platelet count in cyclic thrombocytopenia and thrombocytosis.
abstract: We describe a case of cyclic thrombocytopenia and thrombocytosis, whose cytokine levels, granulocyte-macrophage colony stimulating factor (GM-CSF) and interleukin-6 (IL-6) in plasma, fluctuated in synchrony with platelet count. The levels of the two cytokines correlated significantly with the platelet count for 11 observations over an 8-month period (r = 0.79, p < 0.01 for GM-CSF and r = 0.87, p < 0.001 for IL-6). No inverse relationship between platelet-associated immunoglobulin G (PAIgG) and platelet count was observed (r = 0.39, p > 0.20). These findings suggest that the fluctuation of platelet count in this case may result from an aberration of the cytokine network regulating megakaryopoiesis and platelet formation.
mesh_terms: D000328:Adult; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000097:blood*; D006801:Humans; D015850:Interleukin-6 / Q000097:blood*; D008597:Menstrual Cycle / Q000097:blood; D010976:Platelet Count; D013921:Thrombocytopenia / Q000097:blood*; D013922:Thrombocytosis / Q000097:blood*
chemical_list: D015850:Interleukin-6; D016178:Granulocyte-Macrophage Colony-Stimulating Factor