Rapanone

Rapanone is a phenolic compound that exhibits potent cytotoxic effects against multiple cancer cell lines with IC50 values below 10 μg/mL. The compound induces cancer cell death through mitochondrial respiration inhibition, ATP depletion, and subsequent apoptosis activation.

Origin & History

Rapanone is a naturally occurring benzoquinone primarily extracted from the leaves of the white-berried shrub Ardisia crenata. It is optimally produced using ultrasound-assisted extraction with ethyl acetate or chloroform to achieve high concentrations for cytotoxic studies.

Historical & Cultural Context

Rapanone does not have specific traditional or historical medicinal uses noted in the sources. Its discovery and application focus on modern scientific research for antifungal, anti-inflammatory, and anticancer properties.

Health Benefits

• Exhibits cytotoxic effects against various cancer cell lines, including prostate, thyroid, and colorectal cancers, with IC50 values below 10 μg/mL [1]. • Induces apoptosis in cancer cells through mitochondrial respiration inhibition and ATP depletion [3]. • Demonstrates antiplatelet activity comparable to embelin, reducing platelet aggregation in ex vivo studies [4]. • Provides vasorelaxant effects mediated through nitric oxide pathways in animal models [4]. • Inhibits metastatic regulator BACH1 in breast cancer cells, potentially reducing metastasis [2].

How It Works

Rapanone disrupts mitochondrial respiration by interfering with the electron transport chain, leading to severe ATP depletion in cancer cells. This energy crisis triggers the intrinsic apoptotic pathway through cytochrome c release and caspase activation. Additionally, rapanone demonstrates antiplatelet activity by inhibiting platelet aggregation pathways.

Scientific Research

No human clinical trials or meta-analyses were identified for rapanone. Current evidence is limited to preclinical in vitro and ex vivo studies, such as PMID 36432013 on extraction and cytotoxicity, and PMID 37747058 on BACH1 inhibition.

Clinical Summary

Preclinical studies demonstrate rapanone's cytotoxic activity against prostate, thyroid, and colorectal cancer cell lines with IC50 values consistently below 10 μg/mL. In vitro experiments show significant apoptosis induction within 24-48 hours of treatment through mitochondrial dysfunction. Antiplatelet studies indicate comparable activity to standard antiplatelet agents in laboratory models. However, human clinical trials are lacking, and safety profiles in humans remain undetermined.

Nutritional Profile

Rapanone (5-pentadecyl-2-hydroxy-1,4-benzoquinone; CAS: 491-40-7) is a naturally occurring alkyl benzoquinone compound, not a conventional food ingredient, and therefore has no macronutrient, micronutrient, vitamin, mineral, or fiber profile. It is a pure bioactive secondary metabolite with a molecular weight of 320.47 g/mol and molecular formula C21H32O3. As a lipophilic quinone compound, it contains a 1,4-benzoquinone core ring with a C15 alkyl side chain (pentadecyl group), structurally analogous to embelin and other alkylbenzoquinones. Its primary bioactive constituents are the quinone moiety responsible for redox activity and the long-chain alkyl group conferring lipophilicity (logP estimated >6), which significantly influences membrane permeability and bioavailability. Bioavailability is expected to be limited by poor aqueous solubility due to its highly lipophilic nature; absorption likely occurs via passive diffusion through lipid membranes. It is found in plant sources such as Rapanea species (Myrsinaceae family) and Embelia ribes. No caloric value, protein, carbohydrate, fat, or micronutrient content is applicable. Concentrations in plant material are typically in the range of trace to low milligram-per-gram quantities of dry extract, with reported IC50 bioactivity values below 10 μg/mL in in vitro systems.

Preparation & Dosage

Preclinical in vitro studies used dosages ranging from 5-40 μM (approximately 1.4-11.2 μg/mL) for cytotoxicity. No standardized human dosages are available. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Embelin, Resveratrol, Curcumin, Quercetin, Green Tea Extract

Safety & Interactions

Safety data for rapanone in humans is extremely limited due to lack of clinical trials. Potential interactions with antiplatelet medications like aspirin or warfarin may increase bleeding risk given its antiplatelet activity. The compound's effects on mitochondrial function raise concerns about potential cardiac or neurological toxicity. Pregnancy and breastfeeding safety is unknown and should be avoided.