| First Author | Kim MO | Year | 2012 |
| Journal | Biochim Biophys Acta | Volume | 1820 |
| Issue | 10 | Pages | 1636-46 |
| PubMed ID | 22658979 | Mgi Jnum | J:188070 |
| Mgi Id | MGI:5439071 | Doi | 10.1016/j.bbagen.2012.05.008 |
| Citation | Kim MO, et al. (2012) PKA and cAMP stimulate proliferation of mouse embryonic stem cells by elevating GLUT1 expression mediated by the NF-kappaB and CREB/CBP signaling pathways. Biochim Biophys Acta 1820(10):1636-46 |
| abstractText | BACKGROUND: Regulation of glucose transporter (GLUT) expression and activity plays a vital role in the supply of glucose to embryonic stem (ES) cells. METHODS: To observe the effect of 6-phenyl cyclic monophosphate (cAMP) on glucose uptake and cell proliferation, 2-deoxyglucose (2-DG) uptake, immunohistochemistry, Western blotting, and immunoprecipitation were carried out. RESULTS: Among GLUT isoforms in mouse ES cells, GLUT1 was predominantly expressed and 6-phenyl cAMP increased GLUT mRNA levels. Among cAMP agonists, 6-phenyl cAMP increased 2-DG uptake more than that of 8-p-chlorophenylthio-2'-O-methyl-cAMP. 6-Phenyl cAMP increased GLUT1 expression and translocation from the cytosol to the plasma membrane. 6-Phenyl cAMP increased 2-DG uptake in a time- and concentration-dependent manner due to an increase in V(max) but not K(m). 6-Phenyl cAMP increased phosphorylation of nuclear factor-kappaB (NF-kappaB) and cAMP response element binding (CREB) and expression of the CREB protein (CBP) and transducer of regulated CREB activity 2 (TORC2) in sequence. 6-Phenyl cAMP induced complex formation of NF-kappaB/CREB/CBP/TORC2, which are involved in the increase of gluconeogenic enzyme expression. 6-Phenyl cAMP also increased cell cycle regulatory protein expression levels, the proportion of S-phase cells, and proto-oncogene expression via protein kinase A (PKA)-dependent NF-kappaB signaling. Finally, GLUT1 siRNA blocked the 6-phenyl cAMP-induced increase in ES cell proliferation. We conclude that PKA stimulated the complex formation of CREB/CBP/TORC2 via NF-kappaB, which induced effective coordination of glucose uptake as well as proliferation in ES cells. GENERAL SIGNIFICANCE: 6-Phenyl cAMP-induced PKA activation modified the proliferation, which may be beneficial for expanding ES cell use to cell therapy. |
