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Correlation of interleukin-6 gene expression to immunologic features in patients with cardiac myxomas.
Journal of Interferon & Cytokine Research 1996 August
Cardiac myxomas, the most common primary heart tumors in adults, show a variety of clinical manifestations and laboratory findings correlated with elevated interleukin-6 (IL-6) serum concentration. The aim of this study was to determine the expression of IL-6 mRNA in myxoma tissue as a cause to frequent immunologic abnormalities in patients with such tumors. In our centers, we analyzed 17 surgically resected myxomas using the polymerase chain reaction (PCR) and found increased IL-6 mRNA expression in 14 of 17 cases. The serum IL-6 levels of the 14 patients, detected by enzyme-linked immunosorbent assay (ELISA) with mouse antihuman monoclonal antibody (mAb), were high preoperatively (> 6 pg/ml) and decreased to normal postoperatively (< or = 6 pg/ml). These same 14 patients exhibited significant autoimmune disorders preoperatively. The other 3 patients had normal serum levels of IL-6 (< or = 6 pg/ml) and did not present any serious signs and symptoms, and molecular analysis did not show overexpression of IL-6 mRNA in neoplasmic tissue. These results suggest that IL-6 is overproduced in myxoma tissue and secreted into the systemic circulation as a stimulator of the immunoregulatory system. Furthermore, this study indicates the promising role of molecular biology techniques in the research of pathophysiologic mechanisms of cardiac myxomas.
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