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Role of AKAP 149-PKA-PDE4A complex in cell survival and cell differentiation processes.

著者 Fernández-Araujo A , Tobío A , Alfonso A , Botana LM
Int J Biochem Cell Biol.2014 May 8 ; ():.
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The cellular localization of A-Kinase Anchoring Proteins (AKAPs), Protein Kinase A (PKAs) and Phosphodiesterases (PDEs) is a key step to the spatiotemporal regulation of the second messenger adenosine 3',5'-cyclic monophosphate (cAMP). In this paper the cellular distribution of the mitochondrial AKAP 149-PKA-PDE4A complex and its implications in the cell death induced by YTX treatment, a known PDE modulator, was studied. K-562 cell line was incubated with YTX for 24 or 48hours. Under these conditions AKAP 149, PKA and type-4A PDE (PDE4A) levels were measured in the cytosol, in the plasma membrane and in the nucleus. Apoptotic hallmarks were also measured after the same conditions. In addition, YTX effect on cell viability was checked after AKAP 149 and PDE4A silencing. The results obtained show a decrease in AKAP 149-PKA-PDE4A levels in cytosol after YTX exposure. 24hours after the toxin addition, the complex expression increased in the plasma membrane and after 48hours in the nucleus domain. Furthermore Bcl-2 levels were decreased and the expression of caspase 3 together with caspase 8 activity were increased after 24hours of toxin incubation but not after 48hours. These results suggest apoptotic cell death at 24hours and a non-apoptotic cell death after 48hours. When AKAP 149 and PDE4A were silenced YTX did not induce cellular death. In summary, AKAP 149-PKA-PDE4A complex localization is related with YTX effect in K-562 cell line. When this complex is mainly located in the plasma membrane apoptosis is activated while when the complex is in the nuclear domain non-apoptotic cellular death or cellular differentiation is activated. Therefore AKAP 149-PKA-PDE4A distribution and integrity have a key role in cellular survival.
PMID: 24813785 [PubMed - as supplied by publisher]
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