Essential Oils as Anticancer Agents in Nanotechnology Applications

Essential oils, complex mixtures of volatile phytochemicals, have emerged as promising anticancer agents through their intrinsic bioactivities and synergistic interactions with conventional therapies. However, their clinical translation has been hampered by high volatility, poor aqueous solubility and rapid degradation. Nanotechnology offers solutions via encapsulation within carriers such as nanoemulsions, solid lipid nanoparticles, polymeric systems and liposomal vesicles. These formulations protect labile constituents, enhance targeted delivery to tumour sites and enable controlled release in response to environmental stimuli. Mechanistic studies demonstrate that encapsulated essential oils induce reactive oxygen species, trigger mitochondrial dysfunction and activate intrinsic apoptotic pathways in diverse cancer cell models. In vivo experiments further reveal reduced tumour growth and metastasis with improved safety profiles. The convergence of essential oil pharmacology and nanoscale delivery systems thus holds broad potential to refine anticancer strategies, reduce off-target toxicity and overcome multidrug resistance in solid tumours.

Research from Nature Portfolio

In a seminal study, a nanoemulsion of the phenolic monoterpenoid carvacrol was formulated by ultrasonication to yield droplets of 105–170 nm with negative surface charge. This carrier markedly improved carvacrol’s aqueous dispersibility and stability. In vitro exposure of human lung adenocarcinoma cells to the nanoemulsion led to mitochondrial reactive oxygen species generation, activation of JNK, Bax/Bcl-2 modulation, cytochrome C release and caspase-dependent apoptosis. In vivo administration in a murine xenograft model produced significant tumour regression without discernible systemic toxicity, underscoring the translational promise of essential oil nanoemulsions for lung cancer therapy.

Essential Oils as Anticancer Agents in Nanotechnology Applications publication trend

The graph below shows the total number of articles in essential oils as anticancer agents in nanotechnology applications across all publications each year (not limited to Nature Index journals).

Technical terms

Essential oil: A complex, volatile extract from plant materials, rich in terpenes and phenolic compounds with bioactive properties.

Nanoemulsion: A kinetically stable dispersion of nanoscale oil droplets in water, stabilised by surfactants to enhance solubility and bioavailability.

Solid lipid nanoparticle: A submicron carrier composed of solid lipids that encapsulates hydrophobic agents, offering controlled release and biocompatibility.

Alginate nanoparticle: A polymeric delivery system using alginate to form nanoscale beads or capsules for encapsulation of bioactives and stimulus-responsive release.

Reactive oxygen species (ROS): Highly reactive oxygen-containing molecules that can induce oxidative stress and trigger apoptotic signalling in cancer cells.

Apoptosis: A form of programmed cell death involving caspase activation, mitochondrial permeabilisation and DNA fragmentation.

References

1. In vitro and in vivo antitumor potential of carvacrol nanoemulsion against human lung adenocarcinoma A549 cells via mitochondrial mediated apoptosis. Scientific Reports (2018).
2. Essential oils and their nanoformulations for breast cancer therapy. Phytotherapy Research (2023).
3. Cytotoxic Screening and Enhanced Anticancer Activity of Lippia alba and Clinopodium nepeta Essential Oils-Loaded Biocompatible Lipid Nanoparticles against Lung and Colon Cancer Cells. Pharmaceutics (2023).
4. Alginate Nanoparticles Containing Cuminum cyminum and Zataria multiflora Essential Oils with Promising Anticancer and Antibacterial Effects. International Journal of Biomaterials (2024).