Aggregation of marine sponge cells induced by Ca pulses, Ca ionophores, and phorbol esters proceeds in the absence of external Ca.

Abstract:

:Cells of the sponge Microciona prolifera dissociated in Ca,Mg-free sea water reaggregate upon addition of Ca, an observation classically attributed to the requirement for Ca of a species-specific aggregation factor. We now report that, unexpectedly, extracellular Ca is not required during aggregation; brief Ca pulses (1-3 sec) terminated by excess EDTA suffice to prepare the cells for aggregation by Ca ionophores (e.g. A23187). We also show that phorbol myristate acetate (PMA) promotes aggregation of pulse-prepared cells. Since PMA and A23187 act synergistically in Microciona, the "twin signal" hypothesis, signalling by Ca and protein kinase C in parallel, is validated in this primitive animal.

authors

Dunham P,Weissmann G

doi

10.1016/0006-291x(86)90394-3

subject

Has Abstract

pub_date

1986-02-13 00:00:00

pages

1319-26

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(86)90394-3

journal_volume

134

pub_type

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