AJP - Heart  AJP: Regulatory, Integrative and Comparative Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
 QUICK SEARCH:   [advanced]


     


Am J Physiol Heart Circ Physiol (December 5, 2008). doi:10.1152/ajpheart.00425.2008
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
296/2/H263    most recent
00425.2008v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (1)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Raymond, D. R.
Right arrow Articles by Maurice, D. H.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Raymond, D. R.
Right arrow Articles by Maurice, D. H.
Submitted on April 23, 2008
Revised on December 1, 2008
Accepted on December 2, 2008

DISTINCT PHOSPHODIESTERASE-4D VARIANTS INTEGRATE INTO PROTEIN KINASE A-BASED SIGNALING COMPLEXES IN CARDIAC AND VASCULAR MYOCYTES

Daniel R. Raymond1, Rhonda L Carter1, Christopher A Ward1, and Donald H. Maurice1*

1 Queen's University

* To whom correspondence should be addressed. E-mail: mauriced{at}queensu.ca.

Numerous cAMP-elevating agents regulate events required for efficient migration of arterial vascular smooth muscle cells, (VSMCs). Interestingly, when the impact of cAMP-elevating agents on individual migration-related events are studied, these agents have been shown to have distinct and sometimes, unexpected, effects. For example, although cAMP-elevating agents inhibit overall migration, they promote VSMC adhesion to ECM proteins and the formation of membrane extensions, both events which are essential for and promote migration. Herein, we extend previous observations that identified Phosphodiesterase 4D3 (PDE4D3) as an integral component of a PKA/A-kinase anchoring protein (AKAP) complex in cultured/hypertrophied rat cardiac myocytes to the case for non-hypertrophied cardiac myocytes. Moreover, we show that while rat aortic VSMCs also express PDE4D3, this protein is not detected in PKA/AKAP complexes isolated from these cells. In contrast, we show that another PDE4D splice variant expressed in arterial vascular myocytes, namely PDE4D8, integrates into PKA/AKAP-based signaling complexes in VSMCs. Consistent with the idea that a PDE4D8/PKA/AKAP complex regulates specific VSMC functions, each PKA and PDE4D8 were recruited to leading edge structures in migrating VSMCs, and inhibition of PDE4D8 recruitment to pseudopodia of migrating cells caused localized changes in actin dynamics. Our data are presented in the context that cardiac myocytes and arterial VSMCs may use distinct PDE4D variants to regulate selected pools of targeted PKA activity and that disruption of this complex may allow selective regulation of cAMP-dependent events between these two cardiovascular cell types.




This article has been cited by other articles:


Home page
Am. J. Physiol. Lung Cell. Mol. Physiol.Home page
S. Togo, X. Liu, X. Wang, H. Sugiura, K. Kamio, S. Kawasaki, T. Kobayashi, R. F. Ertl, Y. Ahn, O. Holz, et al.
PDE4 inhibitors roflumilast and rolipram augment PGE2 inhibition of TGF-{beta}1-stimulated fibroblasts
Am J Physiol Lung Cell Mol Physiol, June 1, 2009; 296(6): L959 - L969.
[Abstract] [Full Text] [PDF]




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 1977 by the American Physiological Society.