title: Captivating New Roles of F-Actin Cortex in Exocytosis and Bulk Endocytosis in Neurosecretory Cells.
abstract: The cortical actin network is a tight array of filaments located beneath the plasma membrane. In neurosecretory cells, secretory vesicles are recruited on this network via a small insert isoform of myosin VI in a Ca(2+)-dependent manner. Upon secretagogue stimulation, myosin II mediates a relaxation of the actin network leading to synchronous translocation of bound or caged vesicles to the plasma membrane where they undergo exocytosis. F-actin is also recruited to secretory sites, where structural changes are detected immediately preceding and following exocytic events. Here we examine the mechanism underpinning the astonishing multifunctionality of this network in the various stages of vesicular exocytosis and compensatory bulk endocytosis. We propose a theoretical framework incorporating critical roles of the actin network in coupling these processes.
authors.affiliation: Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia. Electronic address: f.meunier@uq.edu.au.
authors.forename: Frédéric A
authors.initials: FA
authors.lastname: Meunier
authors.affiliation: Instituto de Neurociencias de Alicante, Consejo Superior de Investigaciones Científicas-Universidad Miguel Hernández, Sant Joan d'Alacant, Alicante 03550, Spain. Electronic address: luisguti@umh.es.
authors.forename: Luis M
authors.initials: LM
authors.lastname: Gutiérrez
mesh_terms: D000199:Actins / Q000378:metabolism*; D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D003599:Cytoskeleton / Q000378:metabolism*; D004705:Endocytosis / Q000502:physiology*; D005089:Exocytosis / Q000502:physiology*; D006801:Humans; D022142:Secretory Vesicles / Q000378:metabolism*
chemical_list: D000199:Actins
keywords: cortical actin network; exocytosis–endocytosis coupling; myosin II; myosin VI; neurosecretory cells; secretory vesicles