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Am J Physiol Endocrinol Metab. 2004 May;286(5):E704-10.

Important role for the V-type H(+)-ATPase and the Golgi apparatus in the recycling of PTH/PTHrP receptor.

Author information

1
Endocrine Unit, Massachusetts General Hospital, Harvard Medical School, Bulfinch 327, 55 Fruit St., Boston, MA 02114, USA. tawfeek@helix.mgh.harvard.edu

Erratum in

  • Am J Physiol Endocrinol Metab. 2005 Feb;288(2):E469.

Abstract

Our previous studies demonstrated that a green fluorescent protein-tagged parathyroid hormone (PTH)/PTH-related peptide (PTHrP) receptor stably expressed in LLCPK-1 cells undergoes agonist-dependent internalization into clathrin-coated pits. The subcellular localization of the internalized PTH/PTHrP receptor is not known. In the present study, we explored the intracellular pathways of the internalized PTH/PTHrP receptor. Using immunofluorescence and confocal microscopy, we show that the internalized receptors localize at a juxtanuclear compartment identified as the Golgi apparatus. The receptors do not colocalize with lysosomes. Furthermore, whereas the internalized receptors exhibit rapid recycling, treatment with proton pump inhibitors (bafilomycin-A1 and concanamycin A) or brefeldin A, Golgi disrupting agents, reduces PTH/PTHrP receptor recycling. Together, these data indicate an important role for the vacuolar-type hydrogen-ATPase and the Golgi apparatus in postendocytic PTH/PTHrP receptor recovery.

PMID:
15102616
DOI:
10.1152/ajpendo.00404.2003
[Indexed for MEDLINE]
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