Metabolomics-guided identification of bioactive phytometabolites from South African plants targeting neuroblastoma

Abstract

Neuroblastoma constitutes a solid tumor in pediatric populations, characterized by a dismal prognosis and a scarcity of effective therapeutic interventions. Medicinal flora from South Africa represents valuable sources of bioactive phytometabolites with potential relevance to neuroblastoma. This study employed an integrated workflow merging untargeted UPLC-MS/MS metabolomics, mitochondrial functional assays, and <i>in silico</i> absorption, distribution, metabolism, and excretion (ADME) prediction to systematically identify bioactive metabolites from <i>Acorus calamus</i> and <i>Lippia javanica</i> with activity against SH-SY5Y neuroblastoma cells. Cytotoxic effects were quantified utilizing the CCK-8 assay, while mitochondrial membrane potential (ΔΨm) was conducted through JC-1 flow cytometry. Untargeted UPLC-MS/MS profiling yielded metabolomic fingerprints, through PCA, PLS-DA, and OPLS-DA. ADME and drug-likeness were predicted using SWISSADME. Both plant extracts exhibited dose-dependent inhibition of SH-SY5Y cell viability, with IC₅₀ values determined at 0.2886 μg/μL for <i>A. calamus</i> and 0.3066 μg/μL for <i>L. javanica</i>. The ΔΨm assessment indicated enhanced mitochondrial polarization (68.2% and 65.4% compared to 58.8% in untreated controls), implying modulation of mitochondrial functional status. Metabolomic profiling unveiled distinct phytochemical signatures, including flavonoids, phenolics, jasmonates, and alkaloids, exhibiting significant species-level differentiation (<i>F</i> = 936.71, <i>R</i> ^<i>2</i> = 0.989, <i>p</i> = 0.005). Notable metabolites such as isopropyl β-glucoside, 6β-hydroxymethandienone, and 7-epi-12-hydroxyjasmonic acid demonstrated favorable ADME characteristics and permeability across the blood-brain barrier. This investigation elucidates that <i>A. calamus</i> and <i>L. javanica</i> possess potential efficacy against neuroblastoma, underscoring the translational potential of African medicinal flora in pediatric oncology and necessitating further preclinical exploration.