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Diacylglycerols and the protein kinase inhibitor H-7 suppress cell polarity and locomotion of Walker 256 carcinosarcoma cells.

Abstract：

:We show that diacylglycerols, like phorbol myristate acetate (PMA), suppress cell polarity and locomotor activity of Walker carcinosarcoma cells in a dose-dependent fashion in vitro. OAG and diC8 show significant activity at concentrations above 3 x 10(-5) M. The inhibitory effect on locomotion is due to a reduction in the proportion of locomoting cells rather than gradual lowering of the speed of individual cells. Measurement of protein kinase C (PKC) activity in isolated fractions showed a substantial reduction of the total cellular PKC activity and of the activity in the cytosolic fraction following incubation of cells with 10(-8) M PMA for 30 min. In contrast, the total and relative PKC activity associated with the membrane fraction was increased by PMA. The effect of H-7, an inhibitor of PKC as well as of cAMP-dependent kinase, has been tested. H-7 suppressed cell polarity of "unstimulated" control cells (ID50 = 6.5 microM H-7), colchicine-stimulated cells (ID50 = 92 microM H-7) or cells treated with both PMA and colchicine (ID50 = 15 microM H-7), in a dose-dependent fashion. The locomotor activity of the cells was also suppressed. LTB4 had no clearcut activity in this system. Our findings suggest that diacylglycerols and H-7 are of interest as physiological or pharmacological stop signals for tumor-cell locomotion. Contrary to our expectations, PMA and diacylglycerols vs. H-7 did not produce opposing or antagonistic effects on cell polarity and locomotion. This similarity may be due to down-regulation of PKC by PMA and inhibition of PKC by H-7. However, the mechanisms underlying these novel effects of diacylglycerols and of H-7 on cell polarity and locomotion may be even more complex; they require further studies.

journal_name

Int J Cancer

journal_title

International journal of cancer

authors

Keller HU,Zimmermann A,Niggli V

doi

10.1002/ijc.2910440531

subject

Has Abstract

pub_date

1989-11-15 00:00:00

pages

934-9

issue

5

eissn

0020-7136

issn

1097-0215

journal_volume

44

pub_type

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