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Vol. 17, Issue 2, 598-606, February 2006

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Phospholipase D2 Is Required for Efficient Endocytic Recycling of Transferrin Receptors

Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9038

Submitted May 4, 2005; Revised November 5, 2005; Accepted November 7, 2005
Monitoring Editor: Suzanne Pfeffer

RNA interference-mediated depletion of phospholipase D2 (PLD2), but not PLD1, inhibited recycling of transferrin receptors in HeLa cells, whereas the internalization rate was unaffected by depletion of either PLD. Although reduction of both PLD isoforms inhibits PLD activity stimulated by phorbol 12-myristic 13-acetate, only depletion of PLD2 decreased nonstimulated activity. Cells with reduced PLD2 accumulated a greater fraction of transferrin receptors in a perinuclear compartment that was positive for Rab11, a marker of recycling endosomes. EFA6, an exchange factor for Arf6, has been proposed to stimulate the recycling of transferrin receptors. Thus, one consequence of EFA6 overexpression would be a reduction of the internal pool of receptors. We confirmed this observation in control HeLa cells; however, overexpression of EFA6 failed to decrease the internal pool of transferrin receptors that accumulate in cells previously depleted of PLD2. These observations suggest that either PLD2 is required for a constitutive Arf6-mediated recycling pathway or in the absence of PLD2 transferrin receptors accumulate in recycling endosomes that are not responsive to overexpression of EFA6.

Abbreviations used: PA, phosphatidic acid; PIP, phosphatidylinositol phosphate; PIP2, phosphatidylinositol bisphosphate; PIP5KI, phosphatidylinositol phosphate kinase I; PLD, phospholipase D.

The online version of this article contains supplemental material at MBC Online (http://www.molbiolcell.org).

Address correspondence to: Michael G. Roth (michael.roth{at}email.swmed.edu).

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