Phorbol ester induces changes in the synthesis of nuclear polyphosphoinositides and expression of terminal deoxynucleotidil transferase (TdT) in nuclei of KM-3 cells.
Terminal deoxynucleotidyl Transferase (TdT) play an essential role in the immune system differentiation. KM-3 cells are lymphoblastoid cells expressing the TdT and when induced to differentiate by phorbol ester (PMA) they loose this enzyme. Therefore, because of the suggested involvement of polyphosphoinositide in controlling the nuclear events it has been analyzed the phosphorylation of nuclear polyphosphoinositides during KM-3 differentiation. When the differentiated state is reached the phosphorylation level of PIP2 increases in isolated nuclei and this is accompanied by a concomitant decrease of PIP and PA, hinting at a correlation between polyphosphoinositide metabolism and TdT expression.
Istituto di Citomorfologia Normale e Patologica del CNR, Università di Chieti, Italy.
O
O
Trubiani
A
A
Cataldi
M
M
Rapino
F J
FJ
Bollum
R
R
Di Primio
D002454:Cell Differentiation / Q000187:drug effects; D002458:Cell Fractionation; D002467:Cell Nucleus / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D002855:Chromatography, Thin Layer; D004253:DNA Nucleotidylexotransferase / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D008854:Microscopy, Electron; D018129:Phosphatidylinositol Phosphates; D010716:Phosphatidylinositols / Q000096:biosynthesis*; D010766:Phosphorylation; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
D018129:Phosphatidylinositol Phosphates; D010716:Phosphatidylinositols; D004253:DNA Nucleotidylexotransferase; D013755:Tetradecanoylphorbol Acetate