Autumn elaeagnus

Autumn Elaeagnus (Elaeagnus umbellata Thunb.): A Comprehensive Reference

1. Identity, Taxonomy, and Botanical Description

1.1 Scientific Name and Classification

Elaeagnus umbellata Thunb. is a deciduous shrub or small tree belonging to the family Elaeagnaceae (oleaster family), native to Afghanistan and eastern Asia. The genus name Elaeagnus derives from the Greek for "olive tree," while umbellata is Latin for "bearing umbels," referring to the plant's inflorescence. The genus Elaeagnus is the largest in the Elaeagnaceae family, with approximately 90 reported species, several of which — including E. umbellata Thunb., E. pungens Thunb., E. angustifolia Linn., and E. multiflora Thunb. — have long been used as medicinal herbs.

Common synonyms and vernacular names include autumn olive, autumnberry, Japanese silverberry, spreading oleaster, and silverberry. The Turkish name recorded in the phytochemical literature is Guz yemisi.

1.2 Morphology and Distribution

Elaeagnus umbellata is a deciduous shrub with a height of 3–5 m. Plants bear stems, buds, and leaves with a dense covering of silvery to rusty scales. One of its most easily distinguishable characteristics is its elliptical-shaped, smooth, alternate leaves that are dark green on top and silvery-white on the underside. Especially the young stems bear short thorns extending from the stem. In late summer it produces bunches of small red berries. Some varieties can produce up to 80 pounds (37 kilograms) of bright red berries in a season, which ripen in fall and give the plant its common name, autumn olive.

The genus Elaeagnus consists of approximately 90 species, which can be found at altitudes ranging from 1,200 to 2,100 m and are mostly distributed in subtropical regions of Asia. E. umbellata mainly grows in the Himalayan regions of Pakistan and India. In its origin regions of tropical and temperate Asia, E. umbellata is not considered to be an invasive species, but in many world regions it has become invasive across wild and cultivated areas, particularly in the eastern United States.

1.3 Common Forms and Preparations as a Supplement or Food Ingredient

The plant is used in multiple forms across its native and introduced ranges. The fruits (berries) are the most commonly studied part and are consumed fresh, or processed into jams, fruit purees, fruit leather, concentrates, and juices. Because the main biologically active compounds of E. umbellata are water-insoluble, methanol-acetone fruit extracts are among the preparations used in research, with lycopene, total phenolics, ascorbic acid, and beta-carotene characterized by spectrophotometry and liquid chromatography. In preclinical research, extracts are typically prepared using solvents including methanol, ethanol, acetone, ethyl acetate, chloroform, and hot water. Leaf and bark extracts have also been investigated. In East Asian folk practice, E. umbellata is prepared as an infusion or decoction of the leaves; in rural China, fresh or dried leaves are steeped in hot water.

2. Traditional and Historical Use

2.1 Asia: Native Range Traditions

Elaeagnus umbellata is a plant commonly used in traditional Asian medicine for its many health benefits and strong antioxidative activity. Different parts of E. umbellata have been used in folk medicine as anti-inflammatory, muscle relaxant, antipyretic, analgesic, astringent, antiulcer, antidiabetic, anti-diarrheal, and as a tonic to cure coughs and pulmonary complications.

The fruits of E. umbellata are promoted as a beneficial ingredient in western Chinese, Korean, and Japanese diets owing to their use against cancer, hepatitis and liver disorders, fractures, injuries, and diarrhea. Berries, flowers, leaves, and roots of Elaeagnus species have been employed in folk uses for the treatment of asthma, pulmonary affections, and myocardial infarction.

E. umbellata is abundantly found in Himalayan regions of Pakistan, where it is traditionally used to treat various health disorders. E. umbellata has great folkloric uses in management of various ailments including diabetes and neurodegenerative disorders, attributed to various identified phytoconstituents present in the plant.

2.2 Introduction to North America and Western Use

Autumn olive was introduced into the United States in 1830 and widely planted as an ornamental, for wildlife habitat, as windbreaks, and to restore deforested and degraded lands. The plant was deliberately introduced to the US in the 1830s and was promoted heavily by the US Soil Conservation Service in the 1950s as a windbreak shrub, an erosion-control plant for strip-mined land, and a wildlife food source. Because autumn olive is capable of fixing nitrogen in its roots, it can grow on bare mineral substrates. In its introduced North American range, its edible berries have attracted interest among foragers and those interested in wild food, though the plant is now designated as invasive across much of this range and is prohibited for sale in several states, including Massachusetts since 2006.

3. Key Constituents and Active Compounds

3.1 Phytochemical Overview

Nearly 84 bioactive constituents have been isolated from E. umbellata, of which eugenol, 4-methoxy anisole, 2-nonenal, palmitic acid, 3-hexenyl acetate, fatty acid methyl ester, phenylacetaldehyde, 4-methyl phenol, 2-hexanal, and methyl palmitate are the major ones observed in extracts of floral volatiles.

3.2 Polyphenols, Flavonoids, and Tannins

The berries of E. umbellata, being rich in phenolics, anthocyanins, flavonoids, and tannins, exert beneficial effects through reduction in macromolecular oxidation via a decrease in oxidative stress. The berry extract of E. umbellata is a rich source of polyphenols, flavonols, flavones, proanthocyanidins, anthocyanidins, flavonoids, and glycosides with potential antioxidant and enzyme inhibitory activities.

HPLC analysis revealed the presence of gallic, vanillic, coumaric, ferulic, sinapic, and caffeic acids in berries. Various extracts and isolated compounds such as catechin, chlorogenic acid, epigallocatechin, epigallocatechin gallate, ellagic acid, morin, pyrogallol, quercetin, and rutin have been reported from E. umbellata. A series of seven novel tannins (elaeagnatins A–G) were identified in the leaf extract, along with fifteen other known tannins.

Bioassay-guided fractionation of an extract of leaves and twigs of E. umbellata led to the isolation of a serotonin derivative, N-[2-(5-hydroxyl-1H-indol-3-yl)ethyl]-butanamide, along with six flavonoid glycosides, including multiple kaempferol glycosides.

A further phytochemical study of the leaves and twigs identified 12 compounds, including two flavonoid coumaroyl glycosides, two simple phenolic compounds, one coniferyl alcohol derivative, one monoterpene, two pairs of enantiomeric neolignans, and a pair of enantiomeric sesquineolignans.

3.3 Carotenoids

The berries of E. umbellata also have a rich content of carotenoids such as lycopene, lutein, and β-carotene. Fordham et al. reported that E. umbellata fruits contain 7–17 times more lycopene than tomatoes. The fruits also contain bioactive compounds including lutein, phytofluene, phytoene, β-carotene, β-cryptoxanthin, and α-cryptoxanthin.

3.4 Vitamins and Minerals

The Elaeagnus berry is an excellent source of antioxidative compounds, including carotenoids, phenolics, flavonoids, and vitamins A, C, E, and D. The E. umbellata fruit/berry is rich in vitamins A, C, and E, minerals, flavonoids, alkaloids, steroids, terpenoids, saponins, essential fatty acids, and phenolic acids (cinnamic acid and benzoic acid).

3.5 Essential Oils and Fatty Acids

α-Linolenic acid, reported in the fruit essential oil through GC-MS, has been identified with antidiabetic activities, and phytol (3,7,11,15-tetramethyl-2-hexadecen-1-ol) also shows strong antidiabetic activity. Phytochemicals such as eugenol, palmitic acid, and methyl palmitate exhibit potent antibacterial activity against a broad range of disease-causing agents.

3.6 Alkaloids and Phytosterols

E. umbellata also serves as a source of heterocyclic alkaloids having an indole skeleton and have great importance as anticancer, antihypertensive, antiarrhythmic, antimalarial, and sedative compounds for biological and therapeutic purposes. Phytosterols in the plant, upholding anticoagulant activity, are associated with a decrease in angina and blood cholesterol levels.

3.7 Organic Acids

The quantity of organic acids such as citric, malic, and oxalic acid varies significantly during different stages of ripening and is dependent on climatic conditions, soil, and cultivar choice.

4. Mechanisms of Action

4.1 Antioxidant Mechanisms

The carotenoids beta-carotene and lycopene have proven antioxidative and anti-cancer effects. The E. umbellata extract contains various antioxidants that may limit pro-oxidative effects; additionally, phenols present in the extract have the ability to form stable complexes with transition metal ions such as Cu²⁺ or Fe²⁺, thus preventing Haber-Weiss and Fenton reactions.

Exerting a strong antioxidative effect, anthocyanins effectively help in reducing the occurrence of diseases including cancer and diabetes. Leaf and fruit aqueous extracts showed a harmonious effect on hepatic enzymes and demonstrated significant modulation of phase I and II detoxification enzymes in the liver.

4.2 Anti-Inflammatory and Wound-Healing Mechanisms

Extract of fruits helps in regulating the digestion and absorption of glucose and reduces inflammation and oxidative stress. Oral administration of E. umbellata fruit extract restored UV-mediated reduction in type I collagen and hyaluronan through the inhibition of matrix metalloproteinases and p38 mitogen-activated protein kinase expression, and suppressed UV-dependent increases in superoxide anion production, fatty acid oxidation, and protein nitration by upregulating the antioxidant system.

4.3 Antidiabetic Mechanisms

The enzyme inhibitory potentials of E. umbellata extracts against α-amylase and α-glucosidase enzymes have been determined, pointing to inhibition of key carbohydrate-digesting enzymes as one plausible antidiabetic mechanism. A protective and regenerative effect on pancreatic β-cells has been attributed to activation of β-cell signaling and restoration of histopathological alterations, leading to improved glucose and lipid metabolism.

4.4 Anticholinesterase Mechanisms

In vitro promising anticholinesterase (AChE and BChE) activities were observed for chloroform fractions and the isolated compound chlorogenic acid (CGA), suggesting a possible basis for cognitive or neuroprotective effects through inhibition of acetylcholinesterase enzymes.

4.5 Antiangiogenic Mechanisms

Molecular docking has been performed against vascular endothelial growth factor receptor 2 (VEGFR-2) to understand the binding mechanism of identified compounds; VEGFR-2 is overexpressed in pathological angiogenesis. In molecular docking, five compounds — catechin, catechin hydrate, morin, quercetin, and rutin — from E. umbellata extracts showed strong interactions with VEGFR-2 with binding affinities of −9.4, −9.3, −9.9, −10.2, and −9.4 kcal/mol respectively.

5. Scientific Evidence by Area of Use

5.1 Antioxidant Activity

Evidence level: Preclinical (in vitro and animal); no human clinical trials identified.

Multiple solvent extracts — water, methanol, ethanol, acetone, ethyl acetate, and hexane — of E. umbellata have been evaluated for antioxidant activity using total antioxidant (phosphomolybdenum) assay, inhibition of linoleic acid peroxidation, reducing power, 2-deoxyribose degradation, H₂O₂ scavenging, metal chelating activities, and radical scavenging against DPPH, ABTS, superoxide anion, and peroxide radicals.

Berry extracts showed inhibition against thiobarbituric acid reactive species (TBARS) induced by pro-oxidants iron and sodium nitroprusside in brain and liver homogenates of mice; metal chelating activities showed IC₅₀ values of 40–43 μg/mL, and DPPH radical scavenging activities showed IC₅₀ values of 45.4–49 μg/mL.

Both methanolic leaf and bark extracts demonstrated significant antioxidant activity, with leaf extract showing stronger activity than bark extract. All antioxidant evidence to date is derived from in vitro and animal studies; no controlled human trials have been published.

5.2 Antidiabetic Activity

Evidence level: Preclinical (in vitro and animal models); no human clinical trials identified.

One study was aimed to evaluate the antioxidant, enzyme inhibitory, and antidiabetic potential of E. umbellata. The enzyme inhibitory potential of extracts against α-amylase and α-glucosidase was determined, and the in vivo anti-hyperglycemic effects of the extract in streptozotocin (STZ)-induced type 2 diabetes were evaluated using Sprague-Dawley adult rats.

The methanol extract and subsequent fractions (chloroform and ethyl acetate fractions) of E. umbellata fruits/berries significantly reduced blood glucose levels in in vitro studies as well as in vivo in high-fat diet and low-dose STZ-induced diabetic rats, and also showed hypolipidemic effects.

The active constituents of the chloroform extract derived from E. umbellata berries were identified as morin, phloroglucinol, and 1-hexyl benzene through various spectroscopic techniques (electron ionization mass spectrometry, ¹H-NMR, and ¹³C-NMR spectroscopy).

The authors noted that this research is limited to in vitro and in vivo evaluation of antidiabetic effects of the crude extract and fractions; further studies are required to isolate the phytoconstituents responsible for the antidiabetic activity and to elucidate their mechanism of action, including effects on specific markers such as insulin and glycated hemoglobin levels. No human clinical trials have been conducted.

5.3 Hepatoprotective and Nephroprotective Effects

Evidence level: Preclinical (animal and in vitro); no human clinical trials identified.

Fruits of E. umbellata serve as an excellent source of vitamins, minerals, and other essential compounds that exhibit hypolipidemic, hepatoprotective, and nephroprotective effects. As of recent literature, no in vivo studies had evaluated this plant's hepatoprotective potential in a controlled in vivo model; one subsequent study determined the hepatoprotective potential of E. umbellata using an in vivo animal model. Aqueous extracts of leaves and fruit showed significant modulation of phase I and II liver detoxification enzymes, suggesting a hepatoprotective mechanism via enhancement of detoxification pathways.

5.4 Neuroprotective and Anti-Amnesic Effects

Evidence level: Preclinical (animal models); no human clinical trials identified.

E. umbellata is traditionally used in the Himalayan regions of Pakistan to treat various health disorders; however, experimental evidence supporting the anti-amnesic effect is limited, and studies have aimed to evaluate its prospective beneficial effect on learning and memory in mice.

On the basis of in vitro promising anticholinesterase (AChE and BChE) and antioxidant activities observed for the chloroform fraction and isolated compound chlorogenic acid (CGA), these were further evaluated for learning and memory in normal and scopolamine-induced cognitive impairment in mice. Several studies have shown that regular consumption of polyphenolic-rich berry fruits is associated with delayed Alzheimer's disease and other brain-related disorders because of their antioxidant, anti-inflammatory, and anti-proliferative properties. All neuroprotective evidence remains at the preclinical stage.

5.5 Antimicrobial Activity

Evidence level: Preclinical (in vitro); no human clinical trials identified.

Phytochemicals such as eugenol, palmitic acid, and methyl palmitate exhibit potent antibacterial activity against a broad range of disease-causing agents. Bioactive compounds isolated from E. umbellata have displayed highest potency against both Gram-positive and Gram-negative bacterial strains. All antimicrobial findings are from in vitro screening studies; no clinical trials have been reported.

5.6 Antiangiogenic and Anticancer Activity

Evidence level: Preclinical (ex ovo CAM assay and in silico/molecular docking); no human clinical trials identified.

The antiangiogenic potential of E. umbellata was investigated using a chorioallantoic membrane (CAM) assay and molecular docking; the antiangiogenic activity was carried out using crude methanol, ethyl acetate, and chloroform extracts, and molecular docking was performed against VEGFR-2.

In the CAM assay, the chloroform extract exhibited notable antiangiogenic activity with an IC₅₀ value of 65.02 μg/mL. In molecular docking, five compounds — catechin, catechin hydrate, morin, quercetin, and rutin — showed strong interactions with VEGFR-2 with binding affinities of −9.4, −9.3, −9.9, −10.2, and −9.4 kcal/mol. The authors concluded that E. umbellata possesses antiangiogenic activity, which needs to be explored further. These findings are preliminary and entirely preclinical.

5.7 Antiproliferative (Anticancer) Cell-Based Studies

Evidence level: In vitro (cell lines); no human clinical trials identified.

Multiple in vitro studies using cancer cell lines have shown antiproliferative activity of E. umbellata extracts. Antioxidant, antiproliferative, and enzyme inhibition activities of water, methanol, ethanol, acetone, ethyl acetate, and hexane extracts were evaluated, including measurements of phenolic, flavonoid, anthocyanin, ascorbic acid, lycopene, and β-carotene content. Evidence at this stage is limited to cell culture (in vitro) findings, which do not establish clinical efficacy.

5.8 Skin and Photoprotective Effects

Evidence level: Preclinical (animal — hairless mice); no human clinical trials identified.

One study investigated the protective effects of E. umbellata fruit extract on UV-mediated photoaged skin of SKH1 hairless mice; oral administration of 50–200 mg/kg extract once daily for 15 weeks significantly prevented an increase in skin weight, epithelial thickening, and apoptosis caused by UV irradiation. Skin replica and histopathological analyses revealed dose-dependent decreases in wrinkle and microfold formation; additionally, the extract restored UV-mediated reduction in type I collagen and hyaluronan through inhibition of matrix metalloproteinases and p38 mitogen-activated protein kinase expression. The preventive effects of 100 mg/kg E. umbellata extract administration against UV-induced photoaging were similar to those of 100 mg/kg ascorbic acid, suggesting the fruit is a promising edible candidate to prevent skin photoaging.

5.9 Wound Healing

Evidence level: In vitro (cell culture); no human clinical trials identified.

Kaempferol derivative compounds 1–5 from E. umbellata leaves and twigs promoted keratinocyte proliferation in a dose-dependent manner; compounds 3 and 4 showed potent activities, suggesting that the leaves and twigs of E. umbellata have wound-healing and skin cell regeneration potentials. A significant increase in HFFF-2 fibroblast cell viability was observed after incubation with E. umbellata extract, indicating extract safety in this cell model; enhanced cell viability was probably related to increased FGF-7 expression, and increased HGF expression further suggested that the extract can affect cell proliferation and differentiation.

6. Body Systems and Health Areas of Association

Based on the peer-reviewed literature reviewed, E. umbellata has been studied — exclusively at the preclinical stage unless otherwise noted — in relation to the following body systems and health areas:

• Metabolic and endocrine: Blood glucose regulation, insulin sensitivity, hypolipidemic effects, inhibition of α-amylase and α-glucosidase (antidiabetic).
• Hepatic and renal: Hepatoprotective and nephroprotective activities; modulation of liver detoxification enzymes.
• Cardiovascular: Phytosterols in the plant are associated with anticoagulant activity and decreases in angina and blood cholesterol levels.
• Neurological: Anticholinesterase activity and inhibition of memory impairment in animal models.
• Oncological: Antiangiogenic and antiproliferative activity in cell-based and ex ovo assays.
• Skin and integumentary: UV photoprotection, wound healing via keratinocyte and fibroblast proliferation, collagen preservation.
• Immune/infectious: Broad-spectrum antibacterial activity against Gram-positive and Gram-negative organisms.
• Gastrointestinal: Traditional use for diarrhea, anti-ulcer activity; regulation of glucose digestion and absorption.
• Respiratory: Traditional use for coughs and pulmonary complaints.

7. Dosage Forms and Dosages Reported in Studies

No standardized human dosage has been established for E. umbellata supplements, as no human clinical trials have been completed. The following dosages are reported strictly as stated in preclinical studies:

• Photoaging model (mice, oral): Oral administration of 50–200 mg/kg E. umbellata fruit extract once daily for 15 weeks was used in the UV-induced photoaging study in SKH1 hairless mice.
• In vitro antiangiogenesis: The chloroform extract exhibited notable antiangiogenic activity in the CAM assay with an IC₅₀ value of 65.02 μg/mL.
• Antioxidant in vitro: Extracts showed metal chelating activities of IC₅₀ = 40–43 μg/mL and DPPH radical scavenging activities of IC₅₀ = 45.4–49 μg/mL.
• Antidiabetic (rodent, in vivo): Methanol extract fractions were tested in high-fat diet and STZ-induced diabetic Sprague-Dawley rats; specific per-kilogram dosages were reported in the source study but not fully reproduced in accessible abstract text.

Extract preparations studied include crude methanol extract, ethyl acetate fractions, chloroform fractions, hot water extracts, acetone extracts, and n-hexane extracts. No pharmacopeial monograph or approved therapeutic dosage range for human use exists for this plant as of the available literature.

8. Safety Considerations

Formal human safety data, toxicology studies, or pharmacovigilance reports specifically for E. umbellata as a supplement are not available in the peer-reviewed literature reviewed. The following observations are drawn directly from source-supported findings:

• In vitro cell viability: Results showed a significant increase in HFFF-2 fibroblast cell viability after incubation with E. umbellata extract at both tested concentrations, indicating the extract's safety in that cell model.
• Prooxidant potential of calcium and copper: The E. umbellata extract provides some amounts of calcium and copper ions, though various antioxidants present may limit ascorbic acid's pro-oxidative effects.
• No established human safety data: Despite medicinal and nutritional properties, plants from the genus Elaeagnus are still not available as healthcare products and are still understudied.
• Regulatory and legal status: Since 2006, autumn olive has been designated an invasive species in Massachusetts and its sale and/or propagation is prohibited. Multiple other US states have enacted similar restrictions on planting or selling the plant, though restrictions typically concern horticultural propagation rather than dietary supplement use of processed fruit extracts.
• Absence of human pharmacokinetic or interaction data: No human pharmacokinetic studies, drug-herb interaction data, or established contraindications have been published for E. umbellata as a supplement. Studies repeatedly call for further research to establish safety, efficacy, and mechanistic data in human populations.
• Limitations of existing evidence: Existing research is explicitly limited to in vitro and in vivo evaluation of effects of crude extracts and fractions; further studies are required to isolate the phytoconstituents responsible for biological activity and to elucidate their mechanisms of action.

References

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