Phosphoinositide phosphorylation precedes growth in rat mammary tumors.

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.

authors

Sharoni Y,Teuerstein I,Levy J

doi

10.1016/s0006-291x(86)80501-0

subject

Has Abstract

pub_date

1986-01-29 00:00:00

pages

876-82

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(86)80501-0

journal_volume

134

pub_type

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