From rhizosphere to remedy: Molecular and functional analysis of root exudates with anticancer activity

Summary

This in vitro study characterised root exudates from four hydroponic horticultural crops and evaluated their cytotoxic potential against human cancer cell lines. Tomato root exudates exhibited substantially higher secondary metabolite concentrations and significantly stronger anticancer activity than cucumber, lettuce, or spinach, inducing apoptosis through mitochondrial dysfunction and caspase-dependent pathways. The findings suggest that root exudation represents an underexplored source of bioactive compounds with potential therapeutic applications, though the study does not address agronomic cultivation methods, soil health implications, or human bioavailability.

Regional applicability

This fundamental laboratory study has no geographic specification and uses hydroponic cultivation systems not dependent on region. Transferability to United Kingdom horticulture would require further investigation of whether UK-grown tomato varieties produce similar exudate profiles and whether field-grown plants (not hydroponic) generate comparable bioactive compounds.

Key measures

Root exudate composition (carbohydrates, amino acids, organic acids, phenolics, flavonoids, tannins, alkaloids, steroids, saponins); IC50 values against cancer cell lines (CLS-145, AsPC-1, HCT116, HepG2, KYSE-410, MCF-7); markers of apoptosis (plasma membrane permeability, nuclear condensation, mitochondrial membrane depolarisation, cytochrome c release); relative gene expression (BAX, CASPASE-3, p21, BCL2, CDK1, Cyclin B1)

Outcomes reported

The study measured chemical composition of root exudates (primary and secondary metabolites) and evaluated cytotoxicity against six human cancer cell lines using MTT assay, with apoptosis mechanism confirmation via gene expression analysis. Tomato root exudates demonstrated potent anticancer activity with IC50 values 64–75% lower than doxorubicin.

Topic tags