Adenylate storage, metabolism and utilization in coelomic cells of the polychaeteNereis virens (Annelida, polychaeta)

Eleocytes are specialized coelomic cells in nereid annelids which assume a central role during germ cell development. They may contain extremely high concentrations of both adenosine monophosphate (AMP) and adenosine diphosphate (ADP) (each >10 μmol/ml of cell vol.), whereas the adenosine triphosphate (ATP) content is comparatively low (0.8 μmol/ml cell vol.).31P nuclear magnetic, resonance (NMR) studies of living eleocytes suggest the compartmentalization of both AMP and ADP in the large acidic vacuole characteristic for this cell type. Eleocytes are thus capable of storing high concentrations of ADP and AMP without inhibiting energy metabolism, by sequestering these compounds in a separat…