Oxytocin induces intracellular Ca 2+ release in cardiac fibroblasts from neonatal rats

Pituitary neuropeptide oxytocin is increasingly recognised as a cardiovascular hormone, in addition to its many regulatory roles in other organ systems. Studies in atrial and ventricular myocytes from the neonatal and adult rats have identified synthesis of oxytocin and the expression of oxytocin receptors in these cells. In cardiac fibroblasts, the most populous non-myocyte cell type in mammalian heart, the oxytocin receptors have not been described before. In the present study, we have investigated the direct effects of oxytocin on intracellular Ca dynamics in ventricular myocytes and fibroblasts from new born rats. In myocytes, oxytocin increased the frequency of spontaneous Ca transients and decreased their amplitude. Our data suggest that oxytocin receptors are also present and functional in the majority of cardiac fibroblasts. We used selective oxytocin receptor inhibitor L-371,257 and a number of intracellular Ca release blockers to investigate the mechanism of oxytocin induced Ca signalling in cardiac fibroblasts. Our findings suggest that oxytocin induces Ca signals in cardiac fibroblasts by triggering endoplasmic reticulum Ca release via inositol trisphosphate activated receptors. The functional significance of the oxytocin induced Ca signalling in cardiac fibroblasts, especially for their activation into secretory active myofibroblasts, remains to be investigated.