TRPV1 receptor expression in cardiac vagal afferent neurons of infant rats

► Nodose ganglion neurons were labeled retrogradely from heart with FG in infant rats. ► Among FG-labeled neurons, 89% expressed TRPV1. ► Among FG-labeled TRPV1-expressing neurons, 68% co-expressed NF200. ► Myelinated and unmyelinated cardiac afferent neurons express TRPV1 in immature rats.