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A cell-binding, immunoglobulin-like protein from human plasma. II. Cell-binding activity
Journal of Biochemistry
|October 1, 1986
Summary
Researchers identified a novel high-molecular-mass immunoglobulin-like protein that mediates cell adhesion. This protein binds to specific cell types, excluding cancer cells, suggesting its potential role in cell-surface interactions and as a new cell-binding protein.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- Cell adhesion is crucial for biological processes.
- Understanding cell-surface interactions requires identifying specific binding proteins.
Purpose of the Study:
- To investigate the cell adhesion properties of a novel high-molecular-mass immunoglobulin-like protein from human plasma.
- To determine the specificity of cell binding and identify the protein's function.
Main Methods:
- Coating plastic surfaces with the purified protein.
- Assessing cell attachment using various cell types (fibroblasts, endothelial cells, cancer cells).
- Immunological inhibition assays and indirect immunofluorescence for binding confirmation.
Main Results:
- Normal human plasma protein facilitated adhesion of fibroblasts and endothelial cells, but not cancer cells.
- Adherent cell morphology differed from cells on fibronectin or concanavalin A.
- Goat anti-human IgM inhibited protein-mediated cell adhesion.
- Indirect immunofluorescence confirmed protein binding to cell surfaces.
Conclusions:
- The studied protein is a novel cell-binding protein.
- It exhibits selective binding, adhering to normal cells but not cancer cells.
- This protein plays a role in specific cell adhesion processes.