Phorbol 12-myristate, 13-acetate potentiates the action of the calcium ionophore in stimulating arachidonic acid release and production of phosphatidic acid in rabbit neutrophils.

Abstract:

:The addition of the tumor-promoting phorbol 12-myristate, 13-acetate to rabbit neutrophils greatly potentiates the effect of the calcium ionophore A23187 on [3H]-arachidonic acid release and [32P]-phosphatidic acid generation. At 5 X 10(-8) M A23187, the addition of 20 ng/ml PMA potentiates the action of the ionophore on [3H]-arachidonic acid release by 5-fold. At 5 X 10(-7) M A23187, PMA enhances [32P]-phosphatidic acid production by 1.5-fold. Incubation of the neutrophils with 5 X 10(-7) M ionophore for two minutes causes a significant increase in the [32P] phosphatidic acid production but does not affect the levels of [32P]-phosphatidylinositol or [32P]-phosphatidylinositol 4,5 bis-phosphate. In addition, increasing the sodium chloride concentrations in the suspending medium causes an increase in the level of phosphatidylinositol 4,5 bis-phosphate. These results suggest that the phorbol ester either acting directly or through the activation of protein kinase C modulates significantly the activities of the various forms of phospholipases, particularly A2, and/or increases the availability or amounts of their substrates.

authors

Volpi M,Molski TF,Naccache PH,Feinstein MB,Sha'afi RI

doi

10.1016/0006-291x(85)90087-7

subject

Has Abstract

pub_date

1985-04-30 00:00:00

pages

594-600

issue

2

eissn

0006-291X

issn

1090-2104

pii

0006-291X(85)90087-7

journal_volume

128

pub_type

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