title: A requirement of MAPKAPK2 in the uropod localization of PTEN during FMLP-induced neutrophil chemotaxis.
abstract: The directionality control in chemotaxis is the result of a reciprocal regulation of PI3-kinase and PTEN subcellular localization. MK2(-/-) neutrophils have a directionality loss in fMLP-induced chemotaxis. We found that in polarized WT neutrophils PTEN was localized in the uropod region. However, MK2(-/-) neutrophils or p38 MAPK inhibitor-SB203580-pretreated WT neutrophils showed a disrupted PTEN subcellular localization. Some PTEN was localized at the leading edge of the polarized neutrophils, which may lower the concentration of PI3-kinase lipid product PtdIns(3,4,5)P3 required for directionality sensing. FMLP-stimulated MK2(-/-) neutrophils or SB203580-pretreated WT neutrophils also had disrupted F-actin polarization. F-actin polymerization inhibitor lantrunculin-B disrupted the polarization of PTEN, but not PtdIns(3,4,5)P3. The results suggest that PTEN uropod polarization is F-actin polymerization-dependent and may be through the effect of MK2 on F-actin polarization.
authors.affiliation: Department of Pathology, University of Connecticut, Farmington, CT, USA.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wu
authors.forename: Michael O
authors.initials: MO
authors.lastname: Hannigan
authors.forename: Alexey
authors.initials: A
authors.lastname: Kotlyarov
authors.forename: Matthias
authors.initials: M
authors.lastname: Gaestel
authors.forename: Dianqing
authors.initials: D
authors.lastname: Wu
authors.forename: Chi-Kuang
authors.initials: CK
authors.lastname: Huang
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000494:pharmacology; D002465:Cell Movement; D022081:Cell Surface Extensions / Q000378:metabolism*; D002633:Chemotaxis / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007093:Imidazoles / Q000494:pharmacology; D015151:Immunoblotting; D047908:Intracellular Signaling Peptides and Proteins; D050356:Lipid Metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000166:cytology* / Q000378:metabolism; D051059:PTEN Phosphohydrolase; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D018129:Phosphatidylinositol Phosphates / Q000096:biosynthesis; D010744:Phosphoric Monoester Hydrolases / Q000096:biosynthesis*; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000502:physiology*; D011725:Pyridines / Q000494:pharmacology; D013844:Thiazoles / Q000494:pharmacology; D053778:Thiazolidines; D013997:Time Factors; D025521:Tumor Suppressor Proteins / Q000096:biosynthesis*; D000099190:MAP-Kinase-Activated Kinase 2
chemical_list: D000199:Actins; D019086:Bridged Bicyclo Compounds, Heterocyclic; D004791:Enzyme Inhibitors; D007093:Imidazoles; D047908:Intracellular Signaling Peptides and Proteins; D009240:N-Formylmethionine Leucyl-Phenylalanine; D051059:PTEN Phosphohydrolase; D019869:Phosphatidylinositol 3-Kinases; D018129:Phosphatidylinositol Phosphates; D010744:Phosphoric Monoester Hydrolases; D017346:Protein Serine-Threonine Kinases; D011725:Pyridines; D013844:Thiazoles; D053778:Thiazolidines; D025521:Tumor Suppressor Proteins; D000099190:MAP-Kinase-Activated Kinase 2; C060974:phosphatidylinositol 3,4,5-triphosphate; C037068:latrunculin B; C093642:SB 203580