Alison Skeel

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Macrophage-stimulating protein (MSP) is a member of the hepatocyte growth factor-scatter factor (HGF-SF) family. Labeled MSP bound to Madin-Darby canine kidney (MDCK) cells transfected with complementary DNA encoding Ron, a cell membrane protein tyrosine kinase. Cross-linking of 125I-labeled MSP to transfected cells (MDCK-RE7 cells) and immunoprecipitation(More)
In addition to its effects on macrophage function, macrophage-stimulating protein (MSP) is a growth and motility factor for epithelial cells. The growth and survival of epithelial cells generally require two signals, one generated by interaction with extracellular matrix via integrins, the other initiated by a growth factor. Therefore we investigated the(More)
Human serum macrophage-stimulating protein (MSP) is a disulfide-linked heterodimer that induces motile and phagocytic activity of mouse resident peritoneal macrophages. In this work, we found that MSP blocked the increase in macrophage nitric oxide synthase mRNA, as well as the associated increase in nitric oxide production, that occurred in response to(More)
Cooperation between integrins and growth factor receptors plays an important role in the regulation of cell growth, differentiation, and survival. The function of growth factor receptor tyrosine kinases (RTKs) can be regulated by cell adhesion to extracellular matrix (ECM) even in the absence of ligand. We investigated the pathway involved in(More)
Human serum macrophage stimulating protein (MSP) is a disulfide-linked heterodimer that induces motile and phagocytic activity of mouse resident peritoneal macrophages. It is a member of the family of kringle proteins, which typically exist in extracellular fluid as single chain precursors that are activated by proteolytic cleavage. In this work, we(More)
Macrophage stimulating protein (MSP) exists in blood as inactive pro-MSP. Cleavage yields active MSP, the ligand for a membrane receptor (RON) that is expressed on keratinocytes as well as macrophages. Because both cells have roles in tissue injury, we looked for active MSP and expressed RON in wounds. Concentration of pro-MSP + MSP in wound exudates was in(More)
Neutrophil attractant/activation protein-1 (NAP-1) was previously shown to attract human neutrophils, but not monocytes. The purpose of this study was to determine if NAP-1 interacted with other types of blood leukocytes. In addition to its chemotactic activity for neutrophils, NAP-1 induced chemotactic responses by T lymphocytes and basophils. Chemotactic(More)
Macrophage stimulating protein (MSP) was purified to homogeneity from human blood plasma by selection of biologically active fractions obtained by sequential immunoaffinity and high pressure liquid ion exchange chromatography. By sodium dodecyl sulfate-polyacrylamide gel electrophoresis the molecular mass of MSP was 70 kilodaltons (kD); under reducing(More)
A human hepatoma (HepG2) cell line library was screened with an oligonucleotide probe for macrophage stimulating protein (MSP) to clone an MSP cDNA. Deduced sequences of isolated clones were compared with peptide fragment sequences of MSP. MSP9 cDNA encoded most of the known sequence of MSP except for a small segment of the 5' end of the open reading frame.(More)
Macrophage stimulating protein (MSP) is a chemotactic factor for murine peritoneal macrophages. The receptor for human MSP was recently identified as the ron gene product, a transmembrane protein tyrosine kinase cloned from a human keratinocyte cDNA library. Here we report that MSP induced proliferation of murine primary keratinocytes and established(More)