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Lectin-induced haemocyte inactivation in insects.
Richard Glatz1, Harry L S Roberts, Dongmei Li
1Insect Molecular Biology, School of Agriculture, University of Adelaide, Glen Osmond, SA 5064, Australia.
Journal of Insect Physiology
|November 3, 2004
Summary
Oligomeric lectins can cause cell detachment and spreading by rearranging cell surface receptors. This study proposes a model where cell shape changes depend on a dynamic balance between lectin-mediated adhesion and uptake reactions.
Area of Science:
- Cell biology
- Biochemistry
- Immunology
Background:
- Multimeric lectins function as adhesion molecules, mediating cell attachment and spreading on specific surface molecules.
- Some lectins exhibit counter-adhesion properties, causing already spread cells to detach and change shape.
- Lectin-mediated adhesion and detachment occur in Drosophila haemocytes, which express haemomucin as a key lectin-binding glycoprotein.
Purpose of the Study:
- To investigate the role of oligomeric lectins as extracellular factors influencing cell shape changes.
- To examine lectin-mediated reactions in lepidopteran haemocytes, focusing on their impact on cell morphology.
- To understand the mechanisms behind lectin-induced cell shape alterations.
Main Methods:
- Examined lectin-mediated reactions in lepidopteran haemocytes.
- Utilized cytochalasin D treatment to assess the involvement of F-actin in cell-spreading and lectin-uptake.
- Observed and analyzed cell shape changes in response to lectin interactions.
Main Results:
- Cell-spreading was found to be dependent on F-actin.
- Lectin-uptake demonstrated less dependence on F-actin compared to cell-spreading.
- Lectin-mediated reactions were observed to influence cell shape, suggesting receptor rearrangements.
Conclusions:
- Oligomeric lectins can act as extracellular forces driving cell shape changes.
- A dynamic balance between lectin-mediated adhesion and uptake reactions is proposed to regulate cell shape.
- Receptor rearrangements on the cell surface are implicated in lectin-induced cell behaviors.