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Updated: Aug 7, 2026
The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
Published on: February 16, 2017
Sea urchin embryo as a model organism for the rapid functional screening of tubulin modulators
Marina N Semenova1, Alexander Kiselyov, Victor V Semenov
1Institute of Developmental Biology, Russian Academy of Sciences, Moscow, Russia.
Abstract:
Identification of antimitotic molecules that affect tubulin dynamics is a multistep procedure. It includes in vitro tubulin polymerization assay, studies of a cell cycle effect, and general cytotoxicity assessment. To simplify this lengthy screening protocol, we have introduced and validated an assay system based on the sea urchin embryos. The proposed two-step procedure involves the fertilized egg test for mitotic arrest and the behavioral assessment of a free-swimming blastula. In order to validate the assay, we have analyzed the effect of a panel of known antiproliferative agents on the sea urchin embryo. For all tubulin destabilizing drugs, we observed rapid spinning and lack of forward movement of an embryo. Both effects are likely to result from the in vivo microtubule disassembly caused by test molecules. Notably, the described assay yields rapid information on antiproliferative, antimitotic, cytotoxic, and tubulin destabilizing activities of the molecules along with their solubility and permeability potential. Moreover, measured potencies of the test articles correlated well with the reported values in both in vitro and cell based assays.
Insights
This study introduces a simplified, two-step sea urchin embryo assay for identifying antimitotic molecules. The assay rapidly screens for tubulin destabilizing activity, mitotic arrest, and cytotoxicity.
Area of Science:
- Marine Biology
- Molecular Biology
- Drug Discovery
Background:
- Identifying antimitotic molecules requires lengthy, multi-step assays.
- Existing methods include in vitro tubulin polymerization, cell cycle analysis, and cytotoxicity assessment.
Purpose of the Study:
- To develop and validate a simplified, rapid assay for screening antimitotic molecules.
- To assess the utility of sea urchin embryos for evaluating tubulin dynamics and cytotoxicity.
Main Methods:
- A two-step assay using sea urchin embryos: a fertilized egg test for mitotic arrest and behavioral assessment of blastulae.
- Validation involved testing known antiproliferative agents.
- Analysis of embryo spinning and lack of forward movement as indicators of microtubule disassembly.
Main Results:
- The sea urchin embryo assay successfully identified effects of known antimitotic drugs.
- Observed rapid spinning and lack of forward movement correlated with in vivo microtubule disassembly.
- The assay provided rapid information on antiproliferative, antimitotic, cytotoxic, solubility, and permeability potential.
Conclusions:
- The sea urchin embryo assay offers a simplified and efficient method for screening antimitotic and tubulin-destabilizing compounds.
- Assay results correlate well with established in vitro and cell-based assays.
- This system accelerates the early stages of drug discovery for antimitotic agents.
