title: Wiskott-Aldrich syndrome protein regulates podosomes in primary human macrophages.
abstract: Wiskott-Aldrich syndrome protein (WASp) is a hematopoietic-specific, multidomain protein whose mutation is responsible for the immunodeficiency disorder Wiskott-Aldrich syndrome. WASp contains a binding motif for the Rho GTPase CDC42Hs as well as verprolin/cofilin-like actin-regulatory domains, but no specific actin structure regulated by CDC42Hs-WASp has been identified. We found that WASp colocalizes with CDC42Hs and actin in the core of podosomes, a highly dynamic adhesion structure of human blood-derived macrophages. Microinjection of constitutively active V12CDC42Hs or a constitutively active WASp fragment consisting of the verprolin/cofilin-like domains led to the disassemly of podosomes. Conversely, macrophages from patients expressing truncated forms of WASp completely lacked podosomes. These findings indicate that WASp controls podosome assembly and, in cooperation with CDC42Hs, podosome disassembly in primary human macrophages.
authors.affiliation: Max von Pettenkofer-Institut für Medizinische Mikrobiologie, Pettenkoferstrasse 9a, Ludwig-Maximilians-Universität, 80336 Munich, Germany. stefan.linder@klp.med.uni-muenchen.de
authors.forename: S
authors.initials: S
authors.lastname: Linder
authors.forename: D
authors.initials: D
authors.lastname: Nelson
authors.forename: M
authors.initials: M
authors.lastname: Weiss
authors.forename: M
authors.initials: M
authors.lastname: Aepfelbacher
mesh_terms: D000199:Actins / Q000378:metabolism; D001665:Binding Sites; D018797:Cell Cycle Proteins / Q000378:metabolism; D016764:Cell Polarity; D002478:Cells, Cultured; D005455:Fluorescent Antibody Technique; D005656:Fungal Proteins / Q000378:metabolism; D019204:GTP-Binding Proteins / Q000378:metabolism; D006801:Humans; D008264:Macrophages / Q000166:cytology / Q000502:physiology*; D008840:Microfilament Proteins / Q000378:metabolism; D008856:Microscopy, Fluorescence; D011506:Proteins / Q000378:metabolism / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins; D014923:Wiskott-Aldrich Syndrome; D051316:Wiskott-Aldrich Syndrome Protein; D020764:cdc42 GTP-Binding Protein
chemical_list: D000199:Actins; D018797:Cell Cycle Proteins; D005656:Fungal Proteins; D008840:Microfilament Proteins; D011506:Proteins; D029701:Saccharomyces cerevisiae Proteins; C090350:VRP1 protein, S cerevisiae; C495767:WAS protein, human; D051316:Wiskott-Aldrich Syndrome Protein; D019204:GTP-Binding Proteins; D020764:cdc42 GTP-Binding Protein