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Dissociated neurons from embryonic chick dorsal root and sympathetic ganglia (peripheral neurons) and from spinal cord and retina (central nervous system neurons) were cultured on plastic substrata treated with purified fibronectin and laminin. Both central and peripheral neurons attached to and extended neurites on laminin. In contrast, only peripheral(More)
Laminin is a large (greater than 850-kdalton) glycoprotein that is localized within basement membranes. Recent work has indicated that this protein is present within the endoneurium of mouse sciatic nerve. Furthermore, it has been shown that a rat Schwannoma cell line, RN22F, produced laminin and that laminin promoted the attachment of these cells to(More)
Melanoma chondroitin sulphate proteoglycan (MCSP) is a cell-surface antigen that has been implicated in the growth and invasion of melanoma tumours. Although this antigen is expressed early in melanoma progression, its biological function is unknown. MCSP can stimulate the integrin-alpha4 beta1-mediated adhesion and spreading of melanoma cells. Here we show(More)
The active migration of tumor cells through extracellular matrices has been proposed to play a role in certain aspects of metastasis. Metastatic tumor cells migrate in vitro in response to substratum-bound adhesive glycoproteins such as fibronectin. The present studies use affinity-purified proteolytic fragments of fibronectin to determine the nature of(More)
We studied a rat Schwannoma cell line (RN22F) to determine if it produced the basement membrane glycoproteins laminin and fibronectin, and how it interacted with these proteins in vitro. We used antisera to laminin and fibronectin for immunoprecipitation experiments and immunocytochemical localization at the electron microscope level. Polyacrylamide gels of(More)
A major obstacle in neural transplantation is a severe loss of neurons in grafts soon after implantation. In the present study, we have investigated whether the systemic administration of synthetic fibronectin peptide V can increase the survival of neural grafts. Synthetic fibronectin peptide V is derived from the 33,000 mol. wt carboxyl-terminal(More)
When treated with the synthetic glucocorticoid dexamethasone, HT1080 human fibrosarcoma cells show changes in morphology, adhesion, and the extracellular matrix. Dexamethasone treatment results in a tenfold increase in the rate of fibronectin biosynthesis in HT1080 cells and a twofold increase in untransformed, normal human fibroblasts. Maximal induction(More)
Cell adhesion to extracellular matrix components such as fibronectin has a complex basis, involving multiple determinants on the molecule that react with discrete cell surface macromolecules. Our previous results have demonstrated that normal and transformed cells adhere and spread on a 33-kD heparin binding fragment that originates from the(More)
A synthetic peptide from the inner globule of the B1 chain of laminin, termed peptide F-9 (RYVVLPRPVCFEKGMNYTVR; residues 641-660), has been shown to have heparin-binding and cell adhesion-promoting activities for diverse cell types (Charonis et al., J. Cell. Biol., 107: 1253-1260, 1988). In this study, the metastatic murine fibrosarcoma cell line,(More)
The migration of tumor cells through basement membranes and extracellular matrices is an integral component of tumor invasion and metastasis. Laminin and fibronectin are two basement membrane- and extracellular matrix-associated noncollagenous glycoproteins that have been shown to promote both cell adhesion and motility. Purified preparations of laminin and(More)