The somata of dorsal root ganglion (DRG) neurons release neurotransmitters and neuropeptides.In addition to the conventional Ca2+-dependent secretion (CDS), Ca2+-independent but voltage-dependent secretion (CIVDS) also occurs in the somata of DRG neurons.Electrical stimulation induces bothCDS andCIVDS,which differ in size and are coupled with different types of endocytosis contributed by CIVDS and CDS, respectively.However, it is unclear whether they use a common vesicle pool, so we investigated the relationship between the vesicle pools ofCDSand CIVDS.Membrane capacitance recording and photolysis of a caged-Ca2+ compound showed that, in low extemal Ca2+ solutions, the depolarization-induced exocytosis contained two (fast and slow) phases, which were contributed by C1VDS and CDS, respectively.Depletion of the CDS readily releasable pool using photolysis did not affect the CIVDS.When the CIVDS and CDS vesicle pools were depleted by electrical stimulation, the pools had different sizes.Their kinetics of exocytosis-coupled endocytosis were also different.Thus, CIVDS and CDS used different vesicle pools in DRG neurons.