Journal
HAEMATOLOGICA-THE HEMATOLOGY JOURNAL
Volume 97, Issue 5, Pages 687-691Publisher
FERRATA STORTI FOUNDATION
DOI: 10.3324/haematol.2011.048868
Keywords
cell motility; WASP phosphorylation; dendritic cell; podosome; calpain
Categories
Funding
- Burton Myeloma Programme
- Wellcome Trust
- Medical Research Council
- Great Ormond Street Children's Charity
- Great Ormond Street Hospital Childrens Charity [V1223, V1259] Funding Source: researchfish
- Medical Research Council [G1100041] Funding Source: researchfish
- National Institute for Health Research [NF-SI-0611-10001] Funding Source: researchfish
- MRC [G1100041] Funding Source: UKRI
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Podosomes are actin-based adhesions involved in migration of cells that have to cross tissue boundaries such as myeloid cells. The Wiskott Aldrich Syndrome Protein regulates de novo actin polymerization during podosome formation and it is cleaved by the protease calpain during podosome disassembly. The mechanisms that may induce the Wiskott Aldrich Syndrome Protein cleavage by calpain remain undetermined. We now report that in myeloid cells, tyrosine phosphorylation of the Wiskott Aldrich Syndrome Protein-tyrosine291 (Human)/tyrosine293 (mouse) not only enhances Wiskott Aldrich Syndrome Protein-mediated actin polymerization but also promotes its calpain-dependent degradation during podosome disassembly. We also show that activation of the Wiskott Aldrich Syndrome Protein leading to podosome formation occurs independently of tyrosine phosphorylation in spleen-derived dendritic cells. We conclude that tyrosine phosphorylation of the Wiskott Aldrich Syndrome Protein integrates dynamics of actin and cell adhesion proteins during podosome disassembly required for mobilization of myeloid cells during the immune response.
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