4.6 Article

Mechanisms that underlie the internalization and extracellular signal regulated kinase 1/2 activation by PKR2 receptor

Journal

CELLULAR SIGNALLING
Volume 26, Issue 5, Pages 1118-1124

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2014.01.031

Keywords

Prokineticin; PKR2; Endocytosis; ERK1/2

Categories

Funding

  1. National Basic Research Program of China [2012CB517904]
  2. National Natural Science Foundation of China [31371187, 30970958, 81070481]
  3. Ministry of Education of China
  4. Lotus Scholar Professorship Funds
  5. Hunan Province Government and a research grant provided by the Central South University of China

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Proldneticins (PKs) are a pair of signal factors involved in many physiological processes by binding to two closely related G-protein-coupled receptors (GPCRs), PKR1 and PKR2. We recently demonstrated that PKR2 undergoes rapid ligand-induced endocytosis, and PKR2 recycles back to the plasma membrane after the removal of ligand. However, little is known about the molecular mechanisms underlying the PKR2 endocytosis. Here, we studied the involvement of GPCR kinase 2 (GRK2),beta-arrestins, clathrin and protein kinase C (PKC) in the PKR2 endocytosis. Our results indicated that PK2-induced PKR2 endocytosis is GRK2- and clathrin-dependent, but S-arrestin-independent. PKC activation also induced PKR2 endocytosis; however, PKC activation is not necessary for the PK2-induced PKR2 endocytosis. PK2 stimulation induced a transient activation of extracellular signal regulated kinase 1/2 (ERK1/2) on PKR2 expressing cells. The internalization and PKC activation are not required for the PK2-induced ERK1/2 activation. Our results indicated that PK2-induced ERK1/2 activation may involve the released beta gamma subunits of G-protein, phospholipase C gamma and MEK activation. (C) 2014 Elsevier Inc All rights reserved.

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