Differential redistribution of protein kinase C isoforms by cyclic AMP in HL60 cells.
In this study we have analyzed the distribution of protein kinase C isoforms in cytosol, membrane, and nucleus in HL60 cells. Furthermore, we have studied the redistribution of these isoforms after cyclic AMP treatment. Protein kinase C localization and cyclic AMP-induced translocation was demonstrated by Western blot analysis. Cytosol, membrane and nucleus in HL60 cells expressed the abundance of protein kinase C alpha, betaI, betaII, delta, lambda, and zeta isoforms. After cyclic AMP treatment, the amount of protein kinase C betaI and zeta increased only in the nucleus, while protein kinase C delta increased in the three fractions tested. These effects were dependent on the cyclic AMP concentration and duration of action. Our results suggest the existence of cross-talk between the cyclic AMP system and protein kinase C in HL60 cells. Taking into account the processes regulated by protein kinase C, these findings also suggest that cyclic AMP plays a regulatory role in various cellular responses in HL60 cells, such as differentiation and gene expression. The increase observed in PKC delta was due to cyclic AMP-dependent protein kinase C activation, and the synthesis of enzyme was probably activated by the nucleotide.
Departamento de Bioquímica y Biología Molecular I, Facultad de Biología, Universidad Complutense de Madrid, Madrid, 28040, Spain.
B G
BG
Miguel
M C
MC
Calcerrada
F
F
Mata
P
P
Aller
R
R
Clemente
R E
RE
Catalán
A M
AM
Martínez
D001692:Biological Transport; D002451:Cell Compartmentation; D002467:Cell Nucleus / Q000201:enzymology*; D000242:Cyclic AMP / Q000494:pharmacology*; D003600:Cytosol / Q000201:enzymology*; D018922:HL-60 Cells; D006801:Humans; D007425:Intracellular Membranes / Q000201:enzymology*; D007527:Isoenzymes / Q000378:metabolism; D011493:Protein Kinase C / Q000378:metabolism*; D015398:Signal Transduction
D007527:Isoenzymes; D000242:Cyclic AMP; D011493:Protein Kinase C