Cell adhesion and phagocytosis promoted by monoclonal antibodies not directed against fibronectin receptors.

F. Grinnell, C. H. Ho, T. L. Tuan

Research output: Contribution to journalArticle

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Abstract

In this report we describe cell adhesion and phagocytosis promoted by two monoclonal antibodies that were selected for immunofluorescence staining of non-permeabilized baby hamster kidney (BHK) cells. Anti-BHK1 staining was heaviest along cell margins, whereas anti-BHK2 staining was continuous along cell margins. Neither antibody stained elongated plaque structures such as were observed when cells were reacted with antibodies to fibronectin (FN) receptors. The monoclonal antibodies functioned as adhesion ligands in four different assays: attachment to culture dishes, spreading, binding of latex beads and phagocytosis. Anti-BHK1 and anti-BHK2 promoted attachment to culture dishes similarly, but anti-BHK2 was more effective at promoting cell spreading. Antibody-promoted cell spreading was inhibited by the peptides Ser-Asp-Gly-Arg and Gly-Arg-Gly-Asp-Ser-Pro but not by other, related, peptides tested. The monoclonal antibodies also promoted binding of latex beads, and the bead binding sites were motile, on the basis of their 'capping' response. Nevertheless, anti-BHK2 beads were phagocytosed by cells 5- to 20-fold more efficiently than anti-BHK1 beads. The binding sites for anti-BHK1 and anti-BHK2 were characterized by immunoprecipitation experiments. Anti-BHK1 binding sites contained 50K (K = 10(3) Mr) and 88K components under non-reducing conditions that migrated as a 51/53K doublet and a 93K component under reducing conditions. On the other hand, anti-BHK2 binding sites contained 88K and 110K components under non-reducing conditions that shifted to apparent 107K and 128K values when measured under reducing conditions.

Original languageEnglish (US)
JournalJournal of Cell Science
Volume90
StatePublished - Jun 1988

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Fibronectin Receptors
Cytophagocytosis
Cell Adhesion
Monoclonal Antibodies
Binding Sites
Staining and Labeling
Microspheres
glycyl-arginyl-glycyl-aspartyl-seryl-proline
Antibodies
Peptides
Phagocytosis
Immunoprecipitation
Cricetinae
Fluorescent Antibody Technique
Ligands
Kidney

ASJC Scopus subject areas

  • Cell Biology

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Cell adhesion and phagocytosis promoted by monoclonal antibodies not directed against fibronectin receptors. / Grinnell, F.; Ho, C. H.; Tuan, T. L.

In: Journal of Cell Science, Vol. 90, 06.1988.

Research output: Contribution to journalArticle

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