Phytochemical Properties and Biological Activities of Plectranthus Species

The genus Plectranthus (Lamiaceae) is distinguished by its rich repertoire of secondary metabolites, notably abietane diterpenoids, halimane compounds and a variety of phenolic constituents. These phytochemicals underpin a broad spectrum of biological activities, including antimicrobial, anti-inflammatory, antioxidant and anticancer effects. Abietane diterpenoids such as royleanones interact with key signalling enzymes and apoptotic pathways, while halimanes offer emerging leads in antineoplastic and antibiotic development. Phenolic acids and flavonoids contribute potent free‐radical scavenging and vascular protective actions. Advances in extraction technologies—from supercritical fluid to ultrasound‐assisted methods—have improved both yield and purity of target metabolites, and in vitro culture systems are now employed for sustainable biosynthesis. Detailed structure–activity studies and semi‐synthetic derivatisation, coupled with molecular modelling, have shed light on how subtle chemical modifications influence potency and selectivity. Together, these developments highlight the global significance of Plectranthus species as a source of chemical diversity with applications spanning drug discovery, agriculture and cosmeceuticals.

Research from Nature Portfolio

Recent studies have refined methods to extract and modify the abietane diterpene 7α-acetoxy-6β-hydroxyroyleanone from Plectranthus grandidentatus. By comparing CO₂ supercritical and ultrasound-assisted acetonic extraction, researchers achieved enhanced yields and characterised optimal conditions for isolating the parent compound. Subsequent esterification at specific hydroxyl positions afforded a series of derivatives, which were evaluated for cytotoxicity against breast cancer cell lines. Di-esterified analogues emerged as the most promising, and molecular docking illuminated their selective activation of protein kinase C isoforms. These insights lay the groundwork for targeted kinase modulation in oncological applications.

Phytochemical Properties and Biological Activities of Plectranthus Species publication trend

The graph below shows the total number of articles in phytochemical properties and biological activities of plectranthus species across all publications each year (not limited to Nature Index journals).

Technical terms

Abietane diterpenoid: A class of C20 terpenes based on the abietane skeleton, often bioactive in Plectranthus species.

Halimane: A diterpene framework characterised by a bicyclic ring system, associated with antimicrobial and anticancer properties.

Semi-synthetic derivative: A compound obtained by chemically modifying a natural product to enhance its biological activity.

Protein kinase C (PKC) isoforms: A family of serine/threonine kinases involved in cellular signalling and oncogenic processes.

Reactive oxygen species (ROS): Highly reactive molecules containing oxygen that can induce oxidative damage and modulate apoptotic pathways.

References

1. Halimane Derivatives from Plectranthus ornatus Codd. as Novel Anti-cancer Agents. Biomedicine & Pharmacotherapy (2024).
2. Biological Properties of Extracts Obtained from In Vitro Culture of Plectranthus scutellarioides in a Cell Model. International Journal of Molecular Sciences (2024).
3. Anti-inflammatory activities of Coleus forsteri (formerly Plectranthus forsteri) extracts on human macrophages and chemical characterization. Frontiers in Pharmacology (2023).
4. Extraction optimization and reactivity of 7α-acetoxy-6β-hydroxyroyleanone and ability of its derivatives to modulate PKC isoforms. Scientific Reports (2024).