Abstract:
:As a step towards the elucidation of the role played by nuclear polyphosphoinositides, we have investigated the effect of exogenous calcium free inositol (1,4,5)-trisphosphate on the in vitro phosphorylation of proteins in nuclei prepared from Swiss 3T3 cells treated with bombesin and insulin-like growth factor I. When present in combination with phosphatidylserine, inositol (1,4,5)-trisphosphate enhanced the phosphorylation of two nuclear proteins, Mr 21,000 and 31,000, as well as of exogenous histone H1, to the same extent as a combination of phosphatidylserine and diacylglycerol. Inositol (1,4,5)-trisphosphate alone had no effect. This stimulation could be abolished by the protein kinase C inhibitor sphingosine and by EGTA, while could be restored by a combination of phosphatidylserine and exogenous Ca+(+) ions. These results raise the possibility that inositol (1,4,5)-trisphosphate is capable of liberating Ca+(+) ions from a nuclear store thus stimulating protein kinase C activity.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Martelli AM,Gilmour RS,Manzoli FA,Cocco Ldoi
10.1016/s0006-291x(05)81034-4subject
Has Abstractpub_date
1990-11-30 00:00:00pages
149-55issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(05)81034-4journal_volume
173pub_type
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