Stromal cell-derived factor-1-induced LFA-1 activation during in vivo migration of T cell hybridoma cells requires Gq/11, RhoA, and myosin, as well as Gi and Cdc42.
Dissemination of T cell hybridomas in mice, a model for in vivo migration of memory T cells and for T lymphoma metastasis, depends on the chemokine stromal cell-derived factor-1 (SDF-1) and the integrin LFA-1 and correlates well with invasion into fibroblast cultures. In addition to the known role of the pertussis toxin-sensitive heterotrimeric GTPase G(i), we show that also the pertussis toxin-insensitive GTPase G(q/11) is required for dissemination and invasion. Furthermore, we show that the small GTPases, Cdc42 and RhoA, are involved, and that invasion is blocked by inhibitors of actinomyosin contraction. G(q/11), RhoA, and contraction are specifically required for LFA-1 activation, since 1) they are essential for LFA-1-dependent migration toward low SDF-1 concentrations through ICAM-1-coated filters, but not for migration toward high SDF-1 levels, which is LFA-1 independent; 2) G protein (AlF(4)(-))-induced adhesion to ICAM-1 requires RhoA and contraction; 3) constitutively active G(q) induces aggregation, mediated by LFA-1. We previously reported that binding of this activated LFA-1 to ICAM-1 triggers a signal, transduced by the zeta-associated protein 70 tyrosine kinase, that activates additional LFA-1 molecules. This amplification of LFA-1 activation is essential for invasion. We show here that zeta-associated protein 70-induced LFA-1 activation requires neither Cdc42 and RhoA nor contraction and is thus quite different from that induced by SDF-1. We conclude that two modes of LFA-1 activation, with distinct underlying mechanisms, are required for the in vivo migration of T cell hybridomas.
Soede
R D
RD
Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
Zeelenberg
I S
IS
Wijnands
Y M
YM
Kamp
M
M
Roos
E
E
D000818:Animals; D002464:Cell Migration Inhibition; D002465:Cell Movement / Q000235:genetics / Q000276:immunology*; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000037:antagonists & inhibitors / Q000502:physiology*; D003609:Dactinomycin / Q000378:metabolism; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000502:physiology*; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D020690:GTPase-Activating Proteins / Q000502:physiology; D005822:Genetic Vectors / Q000138:chemical synthesis / Q000276:immunology; D020962:Heterotrimeric GTP-Binding Proteins / Q000235:genetics / Q000502:physiology*; D006825:Hybridomas / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D016169:Lymphocyte Function-Associated Antigen-1 / Q000378:metabolism*; D051379:Mice; D009218:Myosins / Q000502:physiology*; D017154:Stromal Cells / Q000502:physiology; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014162:Transfection; D020764:cdc42 GTP-Binding Protein / Q000235:genetics / Q000502:physiology*; D020742:rhoA GTP-Binding Protein / Q000235:genetics / Q000502:physiology*
D054377:Chemokine CXCL12; D019743:Chemokines, CXC; C515256:Cxcl12 protein, mouse; D020690:GTPase-Activating Proteins; D016169:Lymphocyte Function-Associated Antigen-1; D003609:Dactinomycin; D009218:Myosins; D019206:GTP-Binding Protein alpha Subunits, Gi-Go; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D020962:Heterotrimeric GTP-Binding Proteins; D020764:cdc42 GTP-Binding Protein; D020742:rhoA GTP-Binding Protein; D013755:Tetradecanoylphorbol Acetate