Protein kinases C-beta and C-epsilon link the mast cell high-affinity receptor for IgE to the expression of c-fos and c-jun.
In this report we identify the specific isozymes of protein kinase C (PKC) that are involved in c-fos and c-jun mRNA accumulation in the rat basophilic leukemia cell line RBL-2H3. These cells could be largely depleted of the endogenous PKC isozymes by chronic treatment with phorbol 12-myristate 13-acetate followed by permeabilization of the cells with streptolysin O. The reconstitution of these cells with defined concentrations of either PKC-beta or PKC-epsilon up to 10 nM and 20 nM, respectively, induced c-fos and c-jun in a dose-dependent manner. At high concentrations of PKC-beta and -epsilon the induction of c-fos and c-jun was independent of the aggregation of the high-affinity IgE receptors (Fc epsilon type I receptors). In contrast, at limiting concentrations of these two PKC isozymes, 1 nM, the increase in c-fos and c-jun mRNAs was dependent on the aggregation of the Fc epsilon type I receptors. Unlike PKC-beta and -epsilon, PKC-alpha and PKC-delta failed to reconstitute c-fos and c-jun induction at any dose over the range examined. We conclude that PKC-beta and PKC-epsilon serve as a link between the cell surface receptor and gene expression.
Razin
E
E
Hebrew University Medical School, Jerusalem, Israel.
Szallasi
Z
Z
Kazanietz
M G
MG
Blumberg
P M
PM
Rivera
J
J
D000818:Animals; D001483:Base Sequence; D001491:Basophils / Q000187:drug effects / Q000502:physiology; D002463:Cell Membrane Permeability; D007527:Isoenzymes / Q000378:metabolism*; D008407:Mast Cells / Q000187:drug effects / Q000502:physiology*; D008969:Molecular Sequence Data; D011493:Protein Kinase C / Q000378:metabolism*; D064546:Protein Kinase C beta; D051744:Protein Kinase C-epsilon; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis* / Q000235:genetics; D016760:Proto-Oncogene Proteins c-fos / Q000096:biosynthesis / Q000235:genetics; D016755:Proto-Oncogene Proteins c-jun / Q000096:biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D017455:Receptors, IgE / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured
D007527:Isoenzymes; D011518:Proto-Oncogene Proteins; D016760:Proto-Oncogene Proteins c-fos; D016755:Proto-Oncogene Proteins c-jun; D012333:RNA, Messenger; D017455:Receptors, IgE; C497257:Prkce protein, rat; D011493:Protein Kinase C; D064546:Protein Kinase C beta; D051744:Protein Kinase C-epsilon; D013755:Tetradecanoylphorbol Acetate