Metabolic Activity of Radish Sprouts Derived Isothiocyanates in Drosophila melanogaster.
Level 5 - mechanism / opinion, no new human data
Animal (Drosophila melanogaster) and in vitro experimental study
PubMed 26901196 · doi:10.3390/ijms17020251
What was done
Flies (Drosophila melanogaster) were fed a diet supplemented with lyophilized radish sprouts (Raphanus sativus cv. Rambo, 10.6 g/L) containing the glucosinolates glucoraphenin and glucoraphasatin for 10 days. Researchers assessed the uptake and metabolism of derived isothiocyanates via fly homogenate analysis, measured whole-fly glucose levels, evaluated expression of spargel (the Drosophila homolog of mammalian PGC-1α), and tested the extract's inhibitory activity against α-amylase and α-glucosidase in vitro.
What was found
The metabolite sulforaphane-cysteine was detected in fly homogenates, confirming isothiocyanate absorption and metabolism. Radish sprout consumption decreased fly glucose content and upregulated spargel gene expression. In addition, the sprout extract inhibited α-amylase and α-glucosidase in vitro. The abstract reported no numerical values, effect sizes, or statistical metrics for these changes.
Why it matters
The findings establish Drosophila melanogaster as a model to study glucosinolate metabolism and suggest that radish-derived isothiocyanates can influence carbohydrate metabolism and mitochondrial biogenesis pathways.
Limits
The study was conducted exclusively in fruit flies and in cell-free enzymatic assays, precluding direct translation to mammalian or human physiology. The abstract omits sample sizes (number of flies or replicates), quantitative effect sizes, variance, and p-values. Long-term health outcomes, lifespan, and potential toxicities were not reported.
Cited by
- supports Chewing radishes causes myrosinase to convert a glucoraphanin-like glucosinolate into sulforaphene and other isothiocyanates.