Involvement of Sib Proteins in the Regulation of Cellular Adhesion in Dictyostelium Discoideum

Overview

Journal Eukaryot Cell

Publisher American Society for Microbiology

Specialty Molecular Biology

Date 2008 Aug 5

PMID 18676957

Citations 21

Authors

Sophie Cornillon

Romain Froquet

Pierre Cosson

Affiliations

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Abstract

Molecular mechanisms ensuring cellular adhesion have been studied in detail in Dictyostelium amoebae, but little is known about the regulation of cellular adhesion in these cells. Here, we show that cellular adhesion is regulated in Dictyostelium, notably by the concentration of a cellular secreted factor accumulating in the medium. This constitutes a quorum-sensing mechanism allowing coordinated regulation of cellular adhesion in a Dictyostelium population. In order to understand the mechanism underlying this regulation, we analyzed the expression of recently identified Dictyostelium adhesion molecules (Sib proteins) that present features also found in mammalian integrins. sibA and sibC are both expressed in vegetative Dictyostelium cells, but the expression of sibC is repressed strongly in conditions where cellular adhesion decreases. Analysis of sibA and sibC mutant cells further suggests that variations in the expression levels of sibC account largely for changes in cellular adhesion in response to environmental cues.

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