title: Rho GEF Lsc is required for normal polarization, migration, and adhesion of formyl-peptide-stimulated neutrophils.
abstract: Neutrophil migration requires continuous reorganization of the cytoskeleton and cellular adhesion apparatus. Chemoattractants initiate intracellular signals that direct this reorganization. The signaling pathways that link chemoattractant receptors to the cytoskeleton and cellular adhesion apparatus are now being defined. Formyl-peptide chemoattractants released from bacteria stimulate G-protein-linked receptors on the surface of neutrophils and regulate the neutrophil cytoskeleton and adhesion apparatus through RhoA-dependent pathways. Lsc is a RhoA guanine nucleotide exchange factor that binds the heterotrimeric G-protein alpha-subunits, Galpha12 and Galpha13. We have disrupted the Lsc gene and demonstrated that formyl-peptide-stimulated Lsc knock-out (KO) neutrophils are unable to generate and sustain a single-dominant pseudopod and migrate with increased speed and reduced directionality. Unexpectedly, we also found that Lsc is required for normal beta2- and beta1-integrin-dependent neutrophil adhesion. Lsc-deficient mice have a peripheral leukocytosis and extramedullary hematopoiesis, demonstrating that Lsc is required for leukocyte homeostasis. Lsc-deficient neutrophils are recruited normally to sites of bacterial peritonitis and chemical dermatitis, indicating that other signaling pathways compensate for the Lsc deficiency in some forms of inflammation. These results demonstrate that Lsc links formyl-peptide receptors to RhoA signaling pathways that regulate polarization, migration, and adhesion in neutrophils and that Lsc is required for leukocyte homeostasis.
authors.affiliation: Department of Medicine, Weill Medical College of Cornell University, New York, NY, USA.
authors.forename: Sanjeev A
authors.initials: SA
authors.lastname: Francis
authors.forename: Xun
authors.initials: X
authors.lastname: Shen
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Young
authors.forename: Prashant
authors.initials: P
authors.lastname: Kaul
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Lerner
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology; D002448:Cell Adhesion / Q000502:physiology; D002465:Cell Movement / Q000502:physiology; D016764:Cell Polarity / Q000502:physiology; D020662:Guanine Nucleotide Exchange Factors / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D051379:Mice; D018345:Mice, Knockout; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology*; D011518:Proto-Oncogene Proteins / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D064067:Rho Guanine Nucleotide Exchange Factors
chemical_list: C577231:Arhgef1 protein, mouse; D020662:Guanine Nucleotide Exchange Factors; D011518:Proto-Oncogene Proteins; D064067:Rho Guanine Nucleotide Exchange Factors; D009240:N-Formylmethionine Leucyl-Phenylalanine