Calcitonin gene expression in normal human liver

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Abstract
Immunoreactive calcitonin (CT) is present in liver. This could represent hormone synthesized by liver cells, degraded or bound to specific receptors reported in this organ. We report here that the calcitonin gene is expressed in liver. We proved this by demonstrating, by PCR amplification using specific primers, the presence of calcitonin messenger in human liver and in primary cultures of human hepatocytes and detected by radioimmunoassay CT in hepatic tissues and cells. The synthesis of hormone by liver that also possesses specific receptors for CT favors the presence of an autocrine or paracrine system involving calcitonin in this organ.