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Cell adhesion mechanisms: modeling using derivatized beads and sea urchin cell systems
R L Roque1, S Herrera, T J Yeh
1Center for Cancer and Developmental Biology, California State University, Northridge 91330-8303, USA.
Acta Histochemica
|November 1, 1996
Summary
Multivalent molecules, like dimers and trimers, and phosphorylated amino acids promote cell adhesion. Phosphorylated molecules can modulate cell adhesion, inhibiting sperm-egg interactions but not blastula cell reaggregation in sea urchins.
Area of Science:
- Biochemistry
- Cell Biology
- Developmental Biology
Background:
- Cell adhesion is crucial for multicellular organisms.
- Understanding the molecular basis of cell adhesion is essential for developmental and disease research.
- Previous studies have focused on specific adhesion molecules, but a systematic investigation of molecular valency and modification is lacking.
Purpose of the Study:
- To systematically investigate the role of molecular valency and phosphorylation in cell adhesion using a bead-based model.
- To determine the specific molecular interactions that lead to strong adhesive bonds between cell-like beads.
- To explore the function of phosphorylated molecules in modulating cell adhesion in biological systems, specifically sea urchin gametes and embryos.
Main Methods:
- Derivatization of agarose beads with various molecules including amino acids, peptides, carbohydrates, and lectins.
- Systematic testing of bead pair combinations to assess adhesion strength.
- Investigation of adhesion sensitivity to pH and ionic strength.
- Experimental validation in sea urchin sperm-egg interaction and blastula cell reaggregation assays.
Main Results:
- Strong adhesion was observed with multivalent molecules (dimers, trimers) but not monomers.
- Phosphorylated amino acids promoted adhesion to positively charged peptides, unlike their non-phosphorylated counterparts.
- Adhesion was dependent on pH and ionic strength, suggesting specific chemical interactions.
- Phosphoamino acids inhibited sea urchin sperm-egg interaction, while alkaline phosphatase inhibitors affected blastula cell reaggregation.
Conclusions:
- Multivalency and phosphorylation are key factors in promoting strong cell adhesion.
- Cell surface phosphorylated molecules play a regulatory role in cell adhesion, with context-dependent inhibitory or promoting effects.
- The findings provide insights into the molecular mechanisms of cell adhesion and its modulation in biological processes.