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Updated: Aug 6, 2026
High-throughput Screening and Biosensing with Fluorescent C. elegans Strains
Published on: May 19, 2011
Design, Synthesis and Gene Modulation Insights into Pigments Derived from Tryptophan-Betaxanthin, Which Act against
Paula Henarejos-Escudero1, Fernando F Méndez-García1, Samanta Hernández-García1
1Department of Biochemistry and Molecular Biology A, Faculty of Biology, Regional Campus of International Excellence, Campus Mare Nostrum, University of Murcia, 30100 Murcia, Spain.
Abstract:
The use of betalains, which are nitrogenous plant pigments, by the food industry is widespread and reflects their safety after intake. The recent research showed outstanding results for L-tryptophan-betaxanthin, a phytochemical present in traditional Chinese medicine, as an antitumoral agent when the activity was evaluated in the animal model Caenorhabditis elegans. Thus, L-tryptophan-betaxanthin is now presented as a lead compound, from which eleven novel structurally related betaxanthins have been designed, biotechnologically produced, purified, and characterized. The antitumoral effect of the derived compounds was evaluated on the JK1466 tumoral strain of C. elegans. All the tested molecules significantly reduced the tumoral gonad sizes in a range between 31.4% and 43.0%. Among the novel compounds synthesized, tryptophan methyl ester-betaxanthin and tryptophan benzyl ester-betaxanthin, which are the first betalains to contain an ester group in their structures, caused tumor size reductions of 43.0% and 42.6%, respectively, after administration to the model animal. Since these were the two most effective molecules, their mechanism of action was investigated by microarray analysis. Differential gene expression analysis showed that tryptophan methyl ester-betaxanthin and tryptophan benzyl ester-betaxanthin were able to down-regulate the key genes of the mTOR pathway, such as daf-15 and rict-1.
Insights
Novel betaxanthin compounds show significant antitumor activity in C. elegans models. These phytochemicals, including esterified betalains, effectively reduced tumor size by down-regulating mTOR pathway genes.
Area of Science:
- Biochemistry
- Pharmacology
- Genetics
Background:
- Betalains are nitrogenous plant pigments widely used in the food industry due to their safety.
- L-tryptophan-betaxanthin, a phytochemical from traditional Chinese medicine, demonstrated antitumoral effects in Caenorhabditis elegans.
- This established L-tryptophan-betaxanthin as a lead compound for developing novel therapeutic agents.
Purpose of the Study:
- To design, produce, and characterize novel betaxanthin derivatives based on L-tryptophan-betaxanthin.
- To evaluate the antitumoral efficacy of these novel compounds in a C. elegans tumor model.
- To investigate the mechanism of action of the most effective betaxanthins.
Main Methods:
- Eleven novel betaxanthin compounds were designed and produced using biotechnology.
- Purification and characterization of the synthesized betaxanthins.
- Antitumoral activity was assessed by measuring gonad size reduction in the JK1466 tumoral strain of C. elegans.
- Gene expression analysis using microarray to elucidate the mechanism of action.
Main Results:
- All synthesized betaxanthin derivatives exhibited significant antitumoral effects, reducing tumor sizes by 31.4% to 43.0%.
- Tryptophan methyl ester-betaxanthin and tryptophan benzyl ester-betaxanthin, novel ester-containing betalains, achieved the highest tumor size reductions (43.0% and 42.6%).
- Microarray analysis revealed that these two compounds down-regulated key genes in the mTOR pathway, including daf-15 and rict-1.
Conclusions:
- Novel esterified betaxanthins demonstrate potent antitumoral activity.
- The antitumoral mechanism involves the modulation of the mTOR signaling pathway.
- These findings highlight the therapeutic potential of betaxanthin derivatives as anticancer agents.
