Abstract:
:DMBA-induced rat mammary tumors were used to study the possible association of phosphoinositide phosphorylation to tumor growth. These membranous enzymatic activities were measured during various stages of tumor growth induced by pharmacological manipulation of plasma prolactin level. An increase in phosphorylation of both phosphatidyl inositol and phosphatidyl inositol 4-phosphate preceded the growth induced by prolactin concomitantly with an increase in tyrosine phosphorylation. Good correlation (r = 0.87) existed between the tyrosine kinase activity and phosphatidyl inositol kinase activity of 21 individual tumors taken from animals at different stages of hormonal manipulation. Phosphoinositide phosphorylation was inhibited by quercetin and was not affected by cAMP, similar to tyrosine kinase. Phosphorylation of angiotensin II by tyrosine kinase was inhibited by 0.2 mg/ml phosphatidyl inositol 4 phosphate or phosphatidyl inositol 4,5-bisphosphate.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Sharoni Y,Teuerstein I,Levy Jdoi
10.1016/s0006-291x(86)80501-0subject
Has Abstractpub_date
1986-01-29 00:00:00pages
876-82issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(86)80501-0journal_volume
134pub_type
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