The actin cytoskeleton in store‐mediated calcium entry

JA Rosado, SO Sage - The Journal of physiology, 2000 - Wiley Online Library
JA Rosado, SO Sage
The Journal of physiology, 2000Wiley Online Library
Store‐mediated Ca2+ entry is the main pathway for Ca2+ influx in platelets and many other
cells. Several hypotheses have considered both direct and indirect coupling mechanisms
between the endoplasmic reticulum and the plasma membrane. Here we pay particular
attention to new insights into the regulation of store‐mediated Ca2+ entry: the role of the
cytoskeleton in a secretion‐like coupling model. In this model, Ca2+ entry may be mediated
by a reversible trafficking and coupling of the endoplasmic reticulum with the plasma …
Store‐mediated Ca2+ entry is the main pathway for Ca2+ influx in platelets and many other cells. Several hypotheses have considered both direct and indirect coupling mechanisms between the endoplasmic reticulum and the plasma membrane. Here we pay particular attention to new insights into the regulation of store‐mediated Ca2+ entry: the role of the cytoskeleton in a secretion‐like coupling model. In this model, Ca2+ entry may be mediated by a reversible trafficking and coupling of the endoplasmic reticulum with the plasma membrane, that shows close parallels to the events mediating secretion. As with secretion, the actin cytoskeleton plays an inhibitory role in the activation of Ca2+ entry by preventing the approach and coupling of the endoplasmic reticulum with the plasma membrane, making cytoskeletal remodelling a key event in the activation of Ca2+ entry. We also review recent advances investigating the regulation of store‐mediated Ca2+ entry by small GTPases and phosphoinositides, which might be involved in the store‐mediated Ca2+ entry pathway through roles in the remodelling of the cytoskeleton.
Wiley Online Library