Epithelial-mesenchymal transition, IP3 receptors and ER-PM junctions: translocation of Ca² signalling complexes and regulation of migration.

Okeke, Emmanuel; Parker, Tony; Dingsdale, Hayley; Concannon, Matthew; Awais, Muhammad; Voronina, Svetlana; Molgó, Jordi; Begg, Malcolm; Metcalf, Daniel; Knight, Alex E.; Sutton, Robert; Haynes, Lee; Tepikin, Alexei V.

Disconnection of a cell from its epithelial neighbours and the formation of a mesenchymal phenotype are associated with profound changes in the distribution of cellular components and the formation of new cellular polarity. We observed a dramatic redistribution of inositol trisphosphate receptors (IP3Rs) and stromal interaction molecule 1 (STIM1)-competent endoplasmic reticulum-plasma membrane junctions (ER-PM junctions) when pancreatic ductal adenocarcinoma (PDAC) cells disconnect from their neighbours and undergo individual migration. In cellular monolayers IP3Rs are juxtaposed with tight junctions. When individual cells migrate away from their neighbours IP3Rs preferentially accumulate at the leading edge where they surround focal adhesions. Uncaging of inositol trisphosphate (IP3) resulted in prominent accumulation of paxillin in focal adhesions, highlighting important functional implications of the observed novel structural relationships. ER-PM junctions and STIM1 proteins also migrate to the leading edge and position closely behind the IP3Rs, creating a stratified distribution of Ca2 signalling complexes in this region. Importantly, migration of PDAC cells was strongly suppressed by selective inhibition of IP3Rs and store-operatedCa2 entry (SOCE), indicating that these mechanisms are functionally required for migration.

EPITHELIAL cells; MESENCHYMAL stem cells; FOCAL adhesion kinase; INOSITOL trisphosphate receptors; PANCREATIC cancer

Biochemical Journal, 2016, Vol 473, Issue 6, p757

0264-6021

Academic Journal

10.1042/BJ20150364