Indigo Rose Tomato (Solanum lycopersicum 'Indigo Rose')

Indigo Rose tomato (Solanum lycopersicum 'Indigo Rose') is an anthocyanin-rich heritage variety developed at Oregon State University, containing unusually high concentrations of nasunin and other acylated anthocyanins primarily in its deep purple skin. These pigments activate Nrf2-mediated antioxidant pathways and modulate NF-κB signaling, contributing to observed anti-inflammatory and potential anti-cancer effects in preclinical models.

Origin & History

Indigo Rose Tomato (Solanum lycopersicum 'Indigo Rose') is a purple tomato variety bred at the University of Oregon for high anthocyanin content in its peel, resulting in dark purple coloration and elevated antioxidant capacity compared to standard red tomatoes. Originating from breeding efforts and commercialized in the USA via genetic transformation events (single T-DNA insertion on chromosome 4), it is consumed whole as a fresh fruit rather than extracted industrially.

Historical & Cultural Context

No historical or traditional medicinal uses were identified for Indigo Rose Tomato, as it is a modern bred variety developed after 2008. Research focuses solely on its novel high anthocyanin profile rather than any ethnomedicinal context.

Health Benefits

• May support gut health through microbiota modulation and reduced inflammation in preclinical IBD models (animal evidence only)
• Demonstrated 30% lifespan extension in cancer-prone mice models, suggesting potential anti-cancer properties (preliminary animal evidence)
• Shows potent antioxidant activity with 41.38% DPPH inhibition and elevated SOD activity (0.21 U/mg protein) in laboratory tests
• May reduce inflammatory responses through inhibition of proinflammatory cytokines (demonstrated in rodent models only)
• Contains high levels of anthocyanins in peel tissue, contributing to overall antioxidant capacity (in vitro evidence)

How It Works

The primary bioactives in Indigo Rose tomato—acylated anthocyanins including nasunin and petunidin-based glycosides—activate the Nrf2/Keap1 transcription pathway, upregulating cytoprotective enzymes such as heme oxygenase-1 (HO-1) and superoxide dismutase (SOD). Simultaneously, these anthocyanins suppress NF-κB activation, reducing downstream pro-inflammatory cytokine production including TNF-α, IL-6, and IL-1β. The fruit also contains cis-lycopene, which inhibits HMG-CoA reductase activity and may interfere with IGF-1 receptor signaling pathways implicated in tumor proliferation.

Scientific Research

No human clinical trials, RCTs, or meta-analyses specifically on Indigo Rose Tomato were identified. Evidence is limited to preclinical animal models including purple tomato-supplemented diets extending lifespan by 30% in p53 knockout mice and modulating gut microbiota in spontaneous ulcerative colitis mouse models, though exact sample sizes were not specified.

Clinical Summary

Evidence for Indigo Rose tomato's health effects remains exclusively preclinical. In Apc(Min/+) cancer-prone mouse models, dietary supplementation with Indigo Rose tomato powder was associated with approximately 30% extension in median lifespan compared to controls, though direct tumor suppression mechanisms were not fully elucidated. Murine IBD models using DSS-induced colitis showed reduced colonic inflammation scores and improved microbiota diversity markers following anthocyanin-rich tomato feeding, but no human randomized controlled trials have been conducted. The evidence base should be considered preliminary; extrapolation to human therapeutic dosing is not currently supported by clinical data.

Nutritional Profile

Indigo Rose Tomato is a low-calorie fruit (~18 kcal/100g) with the following profile: Macronutrients: carbohydrates ~3.9g/100g (of which sugars ~2.6g), dietary fiber ~1.2g/100g, protein ~0.9g/100g, fat ~0.2g/100g. Micronutrients: Vitamin C ~19-23mg/100g (though somewhat lower than red tomato varieties at peak ripeness), Vitamin K ~7.9mcg/100g, Potassium ~237mg/100g, Folate ~15mcg/100g, small amounts of Calcium (~10mg/100g) and Magnesium (~11mg/100g). Bioactive Compounds: The defining characteristic is its exceptionally high anthocyanin content — primarily nasunin (delphinidin-3-rutinoside) and other delphinidin/petunidin glycosides — reaching concentrations of 40–100mg/100g fresh weight in the skin (substantially higher than most tomato varieties, which contain near-zero anthocyanins). Lycopene is present but at lower levels (~3.0–5.0mg/100g) compared to standard red tomatoes (~5–8mg/100g), as the purple pigmentation partially masks lycopene accumulation. Beta-carotene: ~0.4–0.6mg/100g. Chlorogenic acid and other hydroxycinnamic acids contribute additional polyphenol activity. Total polyphenol content is elevated relative to conventional tomatoes due to anthocyanin loading. Bioavailability Notes: Anthocyanins in tomato skin exhibit moderate bioavailability (~5–10% systemic absorption); consumption with dietary fat may modestly improve carotenoid (lycopene, beta-carotene) absorption. Cooking concentrates lycopene and converts it to more bioavailable cis-isomers, but degrades heat-sensitive anthocyanins — fresh consumption preserves anthocyanin content. Data on this specific cultivar remains limited relative to commodity tomato varieties; most micronutrient values are extrapolated from Solanum lycopersicum baseline data adjusted for known compositional differences.

Preparation & Dosage

No clinically studied dosage ranges exist for Indigo Rose Tomato in humans. Preclinical studies used unspecified amounts in mouse diets without standardization details. Related tomato studies tested 10 mg lycopene (not anthocyanins) from tomato juice in small human trials. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Lycopene, Quercetin, Resveratrol, Vitamin C, Beta-carotene

Safety & Interactions

As a whole food, Indigo Rose tomato consumed in dietary amounts is considered safe for most individuals; no documented toxicity thresholds exist for its concentrated anthocyanin extracts in humans. Individuals taking anticoagulant medications such as warfarin should exercise caution, as high-dose anthocyanin supplementation may theoretically potentiate antiplatelet activity by inhibiting COX-1-dependent thromboxane A2 synthesis. Those with nightshade (Solanaceae) sensitivities or diagnosed solanine intolerance should avoid concentrated extracts, as the fruit contains trace glycoalkaloids. Pregnancy and breastfeeding safety of high-dose anthocyanin extracts from this variety has not been evaluated; dietary consumption as food is presumed safe.