Hermetica Superfood Encyclopedia
The Short Answer
Isosakuranetin is a citrus-derived flavanone compound that inhibits TRPM3 calcium channels with an IC50 of approximately 1 μM in cellular models. This bioactive compound modulates inflammatory pathways including NF-κB and MAPK/ERK signaling cascades.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelModerate
Primary Keywordisosakuranetin benefits
Synergy Pairings3
Isosakuranetin — botanical close-up
Health Benefits
Origin & History
Natural habitat
Isosakuranetin is an O-methylated flavanone flavonoid (C16H14O5) naturally occurring in citrus species, particularly sweet orange (Citrus sinensis) and bergamot (Citrus bergamia), where it serves as a biomarker for fruit consumption. It is typically extracted from fruit peels using solvent-based methods or chromatographic isolation, yielding a white powder with poor water solubility.
“No direct historical use of isolated isosakuranetin exists in traditional medicine. It occurs naturally in Citrus bergamia (bergamot), used in Italian folk medicine since the 18th century for digestive purposes, and in sweet orange peels used in European herbalism.”Traditional Medicine
Scientific Research
No human clinical trials, randomized controlled trials, or meta-analyses exist for isosakuranetin. Research is limited to preclinical studies, including a 2017 study demonstrating TRPM3 channel blockade in cellular models (PMID: 28258192), with rodent studies using 10-50 mg/kg for anti-inflammatory effects.
Preparation & Dosage
Traditional preparation
No clinically studied dosages exist. Preclinical studies use 10-100 μM in vitro or 10-50 mg/kg in rodents. Commercial products suggest 50-200 mg/day anecdotally without evidence basis. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Isosakuranetin (4'-methoxy-5,7-dihydroxyflavanone, C₁₆H₁₄O₅, MW 286.28) is a methylated flavanone found naturally in blood oranges (Citrus sinensis, ~0.5–2 mg/kg fresh weight), grapefruit peel, and certain citrus juices, as well as in the rhizome of Alpinia katsumadai. It is the 4'-O-methyl ether of naringenin. As a secondary plant metabolite, it has no significant macronutrient, vitamin, or mineral content. Typical dietary intake from citrus sources is very low (<1–5 mg/day). Bioavailability is limited due to extensive Phase II metabolism (glucuronidation and sulfation in the intestine and liver); oral bioavailability in rodent models is estimated at <10–15%. It undergoes partial demethylation to naringenin by CYP450 enzymes (notably CYP1A2 and CYP2C9). The aglycone form is moderately lipophilic (LogP ~2.5), allowing passive intestinal absorption, but rapid hepatic clearance limits systemic exposure. Gut microbiota may further metabolize it into smaller phenolic acids (e.g., 4-hydroxyphenylpropionic acid), which may contribute to biological activity.
How It Works
Mechanism of Action
Isosakuranetin functions as a selective TRPM3 channel antagonist, blocking calcium influx with an IC50 of ~1 μM in vitro. The compound suppresses inflammatory responses by inhibiting NF-κB nuclear translocation and downregulating MAPK/ERK phosphorylation cascades. Additionally, it activates PI3K/Akt/mTOR signaling to enhance cellular antioxidant defenses and reduce oxidative stress markers.
Clinical Evidence
Current research on isosakuranetin is limited to preclinical in vitro studies using cell culture models. TRPM3 channel inhibition studies demonstrated IC50 values around 1 μM in laboratory conditions, but no human clinical trials have been conducted. Anti-inflammatory effects have been observed only in isolated cell systems with no dosage optimization or bioavailability data. The absence of human studies means therapeutic efficacy, optimal dosing, and clinical safety profiles remain unestablished.
Safety & Interactions
No comprehensive safety data exists for isosakuranetin as a supplement due to lack of human studies. Potential interactions with calcium channel medications or anti-inflammatory drugs are theoretically possible given its TRPM3 inhibition and NF-κB modulation properties. Safety during pregnancy and lactation is unknown and should be avoided without clinical guidance. Individuals taking pain medications or immunosuppressive therapies should consult healthcare providers before use.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
5,7-dihydroxy-4'-methoxyflavanone4'-methoxynaringeninC16H14O5O-methylated naringenincitrus flavanonebergamot flavonoid
Frequently Asked Questions
What is the effective dosage of isosakuranetin?
No established human dosage exists for isosakuranetin supplements. Laboratory studies used concentrations around 1 μM, but bioavailability and therapeutic dosing in humans remain unknown due to lack of clinical trials.
Can isosakuranetin help with chronic pain?
Isosakuranetin shows TRPM3 channel inhibition in laboratory studies, which theoretically could affect pain signaling. However, no human pain studies exist, making claims about chronic pain management purely speculative at this time.
Is isosakuranetin safe to take with other supplements?
Safety interactions are unknown due to absence of human studies. Theoretical concerns exist with calcium supplements or anti-inflammatory compounds given isosakuranetin's effects on calcium channels and inflammatory pathways.
How long does isosakuranetin take to work?
Onset time is unknown since no human studies have measured isosakuranetin's effects or pharmacokinetics. Laboratory studies show immediate cellular effects, but this doesn't translate to supplement timing in humans.
What foods contain isosakuranetin naturally?
Isosakuranetin is found naturally in citrus fruits, particularly in the peel and pulp of oranges and grapefruits. Rice bran and certain medicinal plants like Bidens pilosa also contain measurable amounts of this flavanone compound.
What does current research show about isosakuranetin's effectiveness in humans?
Most research on isosakuranetin is limited to laboratory and cellular studies, with very limited human clinical trials available. While preliminary data suggests potential benefits for pain management through TRPM3 channel inhibition and anti-inflammatory effects via NF-κB pathway modulation, these findings have not been robustly confirmed in human populations. More rigorous clinical research is needed before strong conclusions can be drawn about its real-world efficacy in supplemental form.
Who should avoid taking isosakuranetin supplements?
Pregnant and breastfeeding women should avoid isosakuranetin due to insufficient safety data in these populations. Individuals with conditions affecting calcium signaling or those taking medications that modulate immune function should consult a healthcare provider before use. People with known allergies to flavonoids or citrus-derived compounds should also exercise caution.
How does isosakuranetin's mechanism compare to other natural anti-inflammatory compounds?
Isosakuranetin is a flavonoid that reduces inflammation primarily through NF-κB and MAPK/ERK pathway inhibition, similar to other polyphenols like quercetin and luteolin. However, isosakuranetin's additional ability to inhibit TRPM3 calcium channels distinguishes it as having a unique dual mechanism for potential pain management. Direct comparative studies between isosakuranetin and other flavonoids in humans are lacking, making definitive efficacy claims premature.
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