Development of long-term primary cell aggregates from Mediterranean octocorals

Area of Science:

• Marine biology
• Biomineralization research
• Cellular aggregation studies

Background:

• Lower metazoans offer models for studying early biomineralization processes.
• Mechanical cell aggregate production is a key technique in marine biology research.

Purpose of the Study:

• To investigate the potential of gorgonian cell aggregates as models for in vitro biomineralization studies.
• To examine factors influencing aggregate formation, survival, and sclerite secretion in Mediterranean gorgonians.

Main Methods:

• Mechanical production of cell aggregates from five Mediterranean gorgonian species.
• Assessment of aggregate formation, survival, and DNA synthesis (using 5'-bromo-2'-deoxyuridine tests).
• Observation of calcium ion presence (using calcein addition) and de novo sclerite formation.

Main Results:

• Cell proliferation in aggregates is influenced by aggregate size and the presence of symbiotic zooxanthellae.
• Calcein assays indicated intracellular calcium ions, potentially predicting biomineralization.
• Aggregate formation efficiency correlated with polyp size, density, and diameter.
• Eunicella singularis yielded the most stable aggregates, maintaining symbionts and forming sclerites within 30 days.

Conclusions:

• Gorgonian cell aggregates are promising models for studying biomineralization.
• Species-specific characteristics influence aggregate formation and stability.
• Further research into de novo sclerite formation in these aggregates is warranted.