Wortmannin inhibits the growth of mammary tumors despite the existence of a novel wortmannin-insensitive phosphatidylinositol-3-kinase.

Abstract:

PURPOSE:Phosphatidylinositol (PtdIns) 3-kinase is an important mediator of many cellular functions. The study of PtdIns 3-kinase has been facilitated by the existence of the potent irreversible inhibitor of p110 PtdIns 3-kinase, wortmannin. The purpose of the study was to investigate the relationship between the cell growth inhibitory activity and antitumor activity of wortmannin and inhibition of PtdIns 3-kinase. METHODS:PtdIns 3-kinase activity was measured in cells and tumors and the effects of wortmannin investigated. RESULTS:Wortmannin inhibited the growth of murine C3H and human MCF-7 mammary tumors in vivo. However, the ability of wortmannin to inhibit C3H tumor growth was not related to inhibition of tumor PtdIns 3-kinase activity. The existence of wortmannin-insensitive PtdIns 3-kinase activity was demonstrated in C3H and MCF-7 cell culture lysates and solid tumors, and normal mouse tissue homogenates. In addition to being resistant to inhibition by wortmannin, MCF-7 cell lysate total PtdIns 3-kinase activity was also resistant to five additional known inhibitors of p110 PtdIns 3-kinase. Partial purification of wortmannin-insensitive PtdIns 3-kinase from MCF-7 cell lysate showed the activity to be independent of the PtdIns 3-kinase p85 regulatory subunit. CONCLUSION:The results of the current study demonstrate that wortmannin can inhibit the growth of murine and human mammary tumors despite the presence of novel wortmannin-insensitive PtdIns 3-kinases in these tissues suggesting that some other target is responsible for wortmannin's antitumor activity.

authors

Lemke LE,Paine-Murrieta GD,Taylor CW,Powis G

doi

10.1007/s002800051123

keywords:

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

491-7

issue

6

eissn

0344-5704

issn

1432-0843

pii

90440491.280

journal_volume

44

pub_type

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