Previous studies have suggested a role for cytosolic Ca2+-independent phospholipase A2 (PLA2) activity in
the formation of endosome membrane tubules that participate in the export of transferrin (Tf) and transferrin
receptors (TfR) from sorting endosomes (SEs) and the endocytic recycling compartment (ERC). Here
we show that the PLA2 requirement is a general feature of endocytic trafficking. The reversible cytoplasmic
PLA2 antagonist ONO-RS-082 (ONO) produced a concentration-dependent, differential block in the
endocytic recycling of both low-density lipoprotein receptor (LDLR) and TfRs, and in the degradative
pathways of LDL and epidermal growth factor (EGF). These results are consistent with the model that
a cytoplasmic PLA2 plays a general role in the export of cargo from multiple endocytic compartments
by mediating the formation of membrane tubules