Hermetica Superfood Encyclopedia
The Short Answer
Tryptanthrin (Indolo[2,1-b]quinazolin-6,12-dione) is a naturally occurring alkaloid found in plants such as Isatis tinctoria (woad) and Strobilanthes cusia, where it exerts anti-inflammatory and anticancer effects primarily by inhibiting inflammasome activation and suppressing tumor-promoting immune pathways. Its bioactivity centers on blocking NLRP3, NLRC4, and AIM2 inflammasome complexes, as well as reducing regulatory T cell populations in tumor microenvironments.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelModerate
Primary Keywordtryptanthrin benefits
Synergy Pairings3
Tryptanthrin (Indolo[2,1-b]quinazolin-6,12-dione) — botanical close-up
Health Benefits
Origin & History
Natural habitat
Tryptanthrin (indolo[2,1-b]quinazolin-6,12-dione) is a naturally occurring indole alkaloid isolated from traditional medicinal plants like Isatis indigotica (Isatidis Radix), historically used in Chinese medicine. It is obtained through extraction from plant materials followed by purification, with synthetic derivatives also commonly produced for research purposes.
“Tryptanthrin has a long history in traditional Chinese medicine, derived from Isatis indigotica (Isatidis Radix). It has been traditionally used for its antimicrobial properties spanning centuries in these medical systems.”Traditional Medicine
Scientific Research
No human clinical trials, randomized controlled trials, or meta-analyses have been conducted on tryptanthrin. All available evidence is limited to preclinical in vitro studies and animal models, including mouse models of NASH, sepsis, and various cancers.
Preparation & Dosage
Traditional preparation
No clinically studied human dosages are available. Animal studies used intraperitoneal doses of 50-200 mg/kg body weight in mice. In vitro studies tested concentrations of 12.5-100 μM. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Tryptanthrin (Indolo[2,1-b]quinazolin-6,12-dione) is a bioactive alkaloid compound, not a nutrient or food source, so a traditional nutritional profile (macronutrients, vitamins, minerals, fiber, protein) is not applicable. Key chemical and bioactive details: • Molecular formula: C₁₅H₈N₂O₂; Molecular weight: 248.24 g/mol • Classification: Indoloquinazoline alkaloid; a fusion product of indole and quinazoline ring systems • Natural sources: Found in trace quantities in several medicinal plants including Polygonum tinctorium (Japanese indigo, leaves), Isatis tinctoria (woad, leaves and roots), Couroupita guianensis (cannonball tree), and Strobilanthes cusia; also produced by certain yeasts (Candida lipolytica) and bacteria • Typical concentrations in natural sources: Highly variable and generally low; in Isatis tinctoria root extracts (Ban Lan Gen), tryptanthrin is present at approximately 0.001–0.05% w/w depending on extraction method; in Polygonum tinctorium leaf extracts, concentrations range from ~0.01–0.1 mg/g dry weight • Bioavailability notes: Tryptanthrin is a lipophilic compound (LogP ~2.2–2.8) with moderate aqueous solubility (~poorly soluble in water, soluble in DMSO, ethanol, and chloroform); oral bioavailability in rodent models appears limited but sufficient for pharmacological activity at doses of 50–200 mg/kg; absorption is likely enhanced by lipid-based formulations; metabolism involves hepatic cytochrome P450-mediated oxidation and glucuronidation • Key bioactive mechanisms: Functions as a COX-2 inhibitor (IC₅₀ ~0.1–1 µM in cell-based assays), 5-lipoxygenase inhibitor, IκB kinase inhibitor suppressing NF-κB signaling, and inflammasome inhibitor (NLRP3, NLRC4, AIM2); also reported to inhibit indoleamine 2,3-dioxygenase (IDO) and tryptophan metabolism pathways relevant to immune modulation • No caloric value, no macronutrient content, no vitamin or mineral content — this is a pure pharmacologically active small molecule compound, not a food or dietary supplement ingredient in conventional use
How It Works
Mechanism of Action
Tryptanthrin inhibits the assembly and activation of multiple inflammasome complexes—NLRP3, NLRC4, and AIM2—thereby reducing caspase-1 cleavage and downstream secretion of pro-inflammatory cytokines IL-1β and IL-18. It also suppresses the aryl hydrocarbon receptor (AhR) and COX-2-mediated prostaglandin E2 synthesis, attenuating both innate immune overactivation and tumor-supportive inflammation. In cancer models, tryptanthrin reduces CD4+CD25+FoxP3+ regulatory T cells within the tumor microenvironment, thereby partially restoring antitumor immune surveillance.
Clinical Evidence
The majority of evidence for tryptanthrin comes from in vitro cell studies and in vivo mouse models, with no large-scale human clinical trials published to date. In mouse models of non-alcoholic steatohepatitis (NASH), tryptanthrin administration significantly reduced hepatic inflammasome activation and fibrosis markers compared to untreated controls. In Lewis lung carcinoma mouse models, tryptanthrin treatment suppressed primary tumor growth and decreased intratumoral regulatory T cell frequency, though exact dosing and tumor volume reductions varied across studies. Overall, the evidence base remains preliminary and animal-derived; human pharmacokinetic and efficacy data are critically lacking.
Safety & Interactions
Human safety data for isolated tryptanthrin supplementation are extremely limited, and no established safe dosage range has been defined for human use. In rodent studies, tryptanthrin has been administered at doses ranging from approximately 10–50 mg/kg without reported acute toxicity, but this does not establish human safety. Because tryptanthrin modulates AhR signaling and cytochrome P450 enzymes (particularly CYP1A1 and CYP1A2), it may theoretically interact with drugs metabolized by these pathways, including certain antidepressants, antiarrhythmics, and chemotherapy agents. Tryptanthrin should be avoided during pregnancy and lactation due to complete absence of reproductive safety data.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Indolo[2,1-b]quinazolin-6,12-dioneIsatis alkaloidWoad alkaloidIndole quinazoline alkaloid6,12-Dioxo-5,12-dihydroindolo[2,1-b]quinazolineIsatidis Radix alkaloid
Frequently Asked Questions
What plants naturally contain tryptanthrin?
Tryptanthrin is found in several traditional medicinal plants, most notably Isatis tinctoria (woad), Strobilanthes cusia, and Polygonum tinctorium. These plants have been used in Asian and European herbal medicine for centuries, and tryptanthrin is considered one of the key bioactive alkaloids responsible for their anti-inflammatory properties. It is typically extracted from the leaves or aerial parts of these plants using solvent-based methods.
Does tryptanthrin have anticancer properties?
Preclinical studies in Lewis lung carcinoma mouse models show that tryptanthrin can suppress tumor growth and reduce regulatory T cells (CD4+CD25+FoxP3+) within the tumor microenvironment, which may help restore immune-mediated tumor killing. It has also shown antiproliferative activity against various cancer cell lines in vitro, including colorectal and breast cancer cells, likely through apoptosis induction and cell cycle arrest. However, no human clinical trial data exist, so anticancer claims remain strictly preliminary.
How does tryptanthrin reduce inflammation?
Tryptanthrin blocks the activation of NLRP3, NLRC4, and AIM2 inflammasomes, which are multiprotein complexes that drive caspase-1 activation and subsequent release of IL-1β and IL-18—two potent pro-inflammatory cytokines. It also inhibits COX-2 enzyme activity, reducing prostaglandin E2 (PGE2) synthesis, and modulates aryl hydrocarbon receptor (AhR) signaling to dampen inflammatory gene expression. Together, these mechanisms make it a multi-target anti-inflammatory compound in animal studies.
What is the difference between tryptanthrin and tryptophan?
Tryptanthrin and tryptophan are structurally and functionally distinct compounds. Tryptophan is an essential amino acid and precursor to serotonin and melatonin, widely studied for mood and sleep support, while tryptanthrin is a quinazoline alkaloid (Indolo[2,1-b]quinazolin-6,12-dione) with anti-inflammatory and anticancer properties found in specific medicinal plants. The two share no direct biochemical pathway and should not be confused when evaluating supplement options.
Are there any drug interactions with tryptanthrin supplements?
Tryptanthrin is a known modulator of aryl hydrocarbon receptor (AhR) signaling and can induce CYP1A1 and CYP1A2 cytochrome P450 enzymes, which metabolize drugs such as theophylline, clozapine, olanzapine, and certain chemotherapy agents including erlotinib. Co-administration could theoretically alter plasma levels of these medications, though no human interaction studies have been conducted. Individuals on immunosuppressants should also exercise caution, as tryptanthrin's T cell-modulating effects could counteract immunosuppressive therapy.
What does the current research evidence show about tryptanthrin's effectiveness in humans?
Most tryptanthrin research to date has been conducted in animal models and cell cultures, showing promising anti-inflammatory and anticancer effects in mice with NASH, sepsis, and lung cancer. Human clinical trials are limited, meaning safety and efficacy in people remain largely unestablished. The gap between animal studies and human applications means tryptanthrin should be considered an emerging ingredient requiring further research before definitive health claims can be made.
Is tryptanthrin safe for long-term supplementation?
Long-term safety data for tryptanthrin supplements in humans is not well documented, as most research has been short-term animal studies. Potential concerns include unknown effects on immunosuppression at high doses and possible interactions with inflammatory pathways in conditions beyond those studied. Until human safety studies are completed, long-term supplementation should only be considered under medical supervision.
Which forms of tryptanthrin are most bioavailable as a supplement?
Tryptanthrin's bioavailability from supplemental forms has not been thoroughly characterized in human studies, though its lipophilic nature suggests it may require fat for absorption. Most commercial tryptanthrin supplements are derived from natural plant sources like Strobilanthes cusia or delivered as isolated alkaloids, but comparative bioavailability data between forms is lacking. Research into optimal delivery systems and absorption enhancers for tryptanthrin remains preliminary.
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