Overview of available toxicity data for calystegines.

Area of Science:

• Food toxicology
• Alkaloid chemistry
• Risk assessment

Background:

• Calystegines are polyhydroxylated nortropane alkaloids present in solanaceous foods such as potatoes and aubergines.
• Their biological activity is linked to glycosidase inhibition, potentially causing carbohydrate metabolism disruption and lysosomal storage toxicity.

Purpose of the Study:

• To summarize available information on the potential toxicity of calystegines.
• To assess the adequacy of existing toxicological data for human and livestock risk evaluation.
• To investigate the genotoxic potential of specific food-relevant calystegines.

Main Methods:

• Literature review of in vivo toxicological studies on calystegines.
• Analysis of studies on plant-induced toxicity, considering confounding factors like other alkaloids.
• In silico computational modeling to predict genotoxicity alerts for five specific calystegines.

Main Results:

• Few short-term in vivo rodent studies exist, insufficient for chronic toxicity assessment due to study duration and species sensitivity differences.
• Studies on plants containing calystegines are confounded by the presence of other toxic alkaloids, such as swainsonine.
• In silico genotoxicity predictions for five calystegines generally showed no alerts, but low reliability precludes firm conclusions.

Conclusions:

• Available toxicological data for calystegines is insufficient to conclude on their safety for humans or livestock.
• Further research using relevant experimental models is required to characterize the toxicological profile of calystegines.
• The genotoxic potential remains uncertain due to limited experimental data and low reliability of in silico predictions.