title: Adhesion-dependent signaling by macrophage migration inhibitory factor (MIF).
abstract: Proper stimulation of cell cycle progression and DNA synthesis requires cooperating signals from integrin and growth factor receptors. We previously found that the proinflammatory peptide, macrophage migration inhibitory factor (MIF), functions as an autocrine mediator of growth factor-dependent ERK MAP kinase activation and cell cycle progression. We now report that MIF secretion is induced by cell adhesion to fibronectin in quiescent mouse fibroblasts. Adhesion-mediated release of MIF subsequently promotes integrin-dependent activation of MAP kinase, cyclin D1 expression, and DNA synthesis. Secretion of MIF requires protein kinase C activity, and recombinant MIF reconstitutes the activation of MAP kinases in the presence of protein kinase C inhibition. Finally, we show that cells deficient in MIF have significantly higher retinoblastoma tumor suppressor and lower E2F transcriptional activities. These results suggest that MIF is an important autocrine mediator of adhesion-dependent signaling events and may provide mechanistic insight into how MIF regulates proliferative and oncogenic processes.
authors.affiliation: North Shore-Long Island Jewish Health System, Manhasset, New York 11030, USA.
authors.forename: Hong
authors.initials: H
authors.lastname: Liao
authors.forename: Richard
authors.initials: R
authors.lastname: Bucala
authors.forename: Robert A
authors.initials: RA
authors.lastname: Mitchell
mesh_terms: D000818:Animals; D019898:Autocrine Communication; D002448:Cell Adhesion / Q000502:physiology*; D018797:Cell Cycle Proteins; D002465:Cell Movement / Q000502:physiology*; D002478:Cells, Cultured; D019938:Cyclin D1 / Q000378:metabolism; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases / Q000378:metabolism; D004268:DNA-Binding Proteins; D050684:E2F Transcription Factors; D004789:Enzyme Activation; D005109:Extracellular Matrix / Q000378:metabolism; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D005353:Fibronectins / Q000378:metabolism; D017930:Genes, Reporter; D016023:Integrins / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000502:physiology*; D008263:Macrophage Migration-Inhibitory Factors / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism; D011518:Proto-Oncogene Proteins; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D016160:Retinoblastoma Protein / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D050684:E2F Transcription Factors; D005353:Fibronectins; D016023:Integrins; D008263:Macrophage Migration-Inhibitory Factors; D011518:Proto-Oncogene Proteins; D011993:Recombinant Fusion Proteins; D016160:Retinoblastoma Protein; D014157:Transcription Factors; D019938:Cyclin D1; D011493:Protein Kinase C; C495902:Cdk4 protein, mouse; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases; D020928:Mitogen-Activated Protein Kinases