Sesamum alatum (Pedaliaceae) Winged-Seed Sesame

Sesamum alatum, commonly known as winged-seed sesame or gazelle sesame, is an erect annual herb native to the dry regions of Africa, spanning from Senegal and Western Sahara to South Africa, and has also been introduced to parts of India and Madagascar. While its close relative, Sesamum indicum, is the globally cultivated source of sesame seeds, this species has long remained a wild-harvested and locally cultivated plant with a distinct identity shaped by the harsh conditions of the savanna and semi-desert. Reaching heights of 50 to 150 centimetres, it is easily recognised by its heteromorphic leaves and, most distinctively, its winged seeds. For generations, communities across Africa have used it as a nutritious food, an edible oil source, and a remedy for various ailments, from digestive troubles to fever. In recent years, its medicinal potential has drawn significant scientific interest, particularly with the discovery of potent compounds in its roots that show remarkable activity against multiple myeloma cancer cells and parasitic diseases.

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1. Taxonomic Insights

Species: Sesamum alatum Thonn.

Family: Pedaliaceae (Sesame Family)

The Pedaliaceae family is a group of flowering plants predominantly found in the tropics and subtropics of the Old World, especially in dry or coastal habitats. They are often characterised by their mucilaginous tissues and, in many species, a distinct attachment organ on the fruit. This family is most famous for the genus Sesamum, which includes the cultivated sesame (S. indicum), a major global source of edible oil and seeds. The genus Sesamum comprises about 20 species, many of which are native to Africa.

Taxonomic Note: Sesamum alatum was first described by the Danish botanist Peter Thonning in 1827. The generic name Sesamum is derived from ancient Semitic languages, akin to the Akkadian word šamaššamu, which refers to oil or liquid fat, highlighting the plant's long-recognised oil-bearing properties. The specific epithet alatum comes from the Latin for "winged", a direct reference to the species' most characteristic feature: its seeds, which possess a suborbicular wing at the apex and two shorter wings at the base. This is an erect, glabrous annual herb with a stem that is four-angled and often sulcate (grooved). A key identifying feature is its heteromorphic leaves; the lower leaves are deeply divided or compound, while the upper leaves are simple and linear.

Related Herbs from the Same Family:

· Sesamum indicum (Sesame): The most economically significant member of the family, cultivated worldwide for its edible seeds and oil. It shares the same genus and similar seed oil properties, though its medicinal profile differs.

· Ceratotheca triloba (South African Foxglove): An ornamental plant native to southern Africa, also used in traditional medicine for its mucilaginous properties, often for treating skin conditions.

· Martynia annua (Devil's Claw, Cat's Claw): A species now widely naturalised, known for its unique hooked fruits and used in traditional medicine for its anti-inflammatory properties.

· Rogeria longiflora: A less common genus within the family, also native to Africa, with similar growth habits and occasional medicinal applications.

2. Common Names

Scientific Name: Sesamum alatum | English: Winged-Seed Sesame, Gazelle Sesame, Wild Sesame | French: Sésame de Gazelle | Shona: Guzozo (Zimbabwe) | Local Arabic (Chad): Sumsum al rhazal

3. Medicinal Uses

Primary Actions: Anticancer, Antiprotozoal, Anti-inflammatory, Antimicrobial, Antidiabetic, Renoprotective

Secondary Actions: Aphrodisiac, Antidiarrheal, Febrifuge, Nutritive, Immunomodulatory

Medicinal Parts:

The roots, leaves, seeds, and aerial parts are the primary parts used medicinally, with roots being the most researched in modern pharmacological studies.

· Roots: The root extract has demonstrated significant activity in modern research. A dichloromethane extract of the root has shown complete inhibition of multiple myeloma cancer stem cell growth and over 90% inhibition of NF-kappa-B, a protein complex that controls transcription of DNA and plays a key role in inflammatory responses. It has also exhibited potent activity against parasites such as Leishmania donovani and Trypanosoma brucei rhodesiense. This modern activity aligns with its traditional use for sterility, fever, and diarrhoea.

· Leaves: Traditionally, a decoction of the leaves is given to cattle to promote fertility, while in human medicine, they are used for their antimicrobial properties. Research has confirmed antibacterial activity in the leaves, supporting the traditional use for treating wounds.

· Seeds: The seeds are used traditionally as an aphrodisiac and to treat diarrhoea and other intestinal disorders. They are also a source of edible oil with a unique fatty acid and tocopherol profile.

· Aerial Parts: Studies have identified new saponins from the aerial parts, which contribute to the plant's traditional uses and overall pharmacological profile. The plant also exhibits antidiabetic and renoprotective activities.

4. Phytochemicals Specific to the Plant and Their Action

The phytochemistry of Sesamum alatum is unique and has been the subject of intensive modern research, revealing a treasure trove of compounds with potent biological activities, especially from the roots and seeds.

· Naphthoquinones and Anthraquinones (Roots): The roots are rich in bioactive naphthoquinones and anthraquinones, which are responsible for their potent anticancer and antiparasitic activities. Key compounds include anthrasesamone A, hydroxysesamone, and newly discovered compounds like 9-hydroxy-2,2-dimethyl-2H-benzo[g]chromene-5,10-dione 6-O-beta-D-glucopyranoside. Chlorosesamone and 2,3-epoxysesamone have also been isolated; the latter, compound 17, demonstrated the most potent activity against multiple myeloma cell lines with IC50 values as low as 0.6 microM. These compounds work by inhibiting cancer cell growth and suppressing the NF-kappa-B pathway.

· Unique Saponins and Lignans (Aerial Parts and Seeds): The aerial parts contain new saponins, such as alatoside, with an 18,19-secours-12-ene skeleton. The seeds contain a distinctive furofuran lignan called 2-episesalatin, which is a sesamin-type lignan. These compounds contribute to the plant's overall pharmacological profile, including anti-inflammatory and antidiabetic properties.

· Flavonoids and Other Compounds (Leaves): Phytochemical screening of the leaves has revealed the presence of flavonoids, alkaloids, glycosides, and terpenes in the leaves, which are responsible for its antimicrobial activity against sensitive and resistant bacterial strains.

· Seed Oil Profile: The seed oil has a unique composition with 45.1% oleic acid and 36.3% linoleic acid. It is also rich in tocopherols, with gamma-tocopherol (21.4 mg/100g oil) being the most predominant, followed by alpha- and beta-tocopherol.

5. Traditional and Ethnobotanical Uses Covering the Medicinal Uses

Raktapitta (Blood Disorders) and Jwara (Fever)

Formulation: Root decoction or infusion.

Preparation and Use: The roots of Sesamum alatum are a cornerstone of traditional African medicine. They are used in Niger to treat women's sterility, diarrhoea, and fever. In other regions, the plant is used for its antipyretic properties, as well as for respiratory conditions. The root extract is also used in various preparations to address blood disorders and internal inflammation. This wide range of traditional uses is validated by modern research which has found that the root extract possesses strong anti-inflammatory and immunomodulating effects. The inhibition of NF-kappa-B, a key regulator of inflammatory response, provides a powerful mechanistic basis for its traditional use in treating conditions like fever and sterility.

Atisara (Diarrhoea) and Krimi Roga (Intestinal Disorders)

Formulation: Seed powder or decoction.

Preparation and Use: The seeds are a widely used remedy for diarrhoea and other intestinal disorders in many African countries, including Sudan and Chad. They can be eaten raw, ground into a powder, or mixed with other foods to help manage digestive complaints. The astringent and antimicrobial properties of the seeds, which may be due to their unique lignans and other bioactive compounds, help to address gastrointestinal infections and soothe the digestive tract. The plant's use as a vermifuge is also noted in some traditions.

Madhumeha (Diabetes) and Renal Protection

Formulation: Leaf extract or whole plant decoction.

Preparation and Use: Sesamum alatum is traditionally used in some regions to manage diabetes and metabolic disorders. Modern research has provided a scientific rationale for this use by demonstrating that the plant possesses significant antidiabetic and renoprotective activities. Studies have shown that the methanolic leaf extract can reduce blood glucose levels and protect the kidneys from diabetes-induced damage. It helps in maintaining the levels of antioxidant enzymes (SOD, Catalase) and reducing oxidative stress markers (MDA) in the kidneys, thereby offering protection against diabetic nephropathy.

Vranaropana (Wound Healing) and Antimicrobial Use

Formulation: Leaf paste or extract.

Preparation and Use: Rural communities across Africa use the crude extract of the leaves for treating wounds, an application rooted in the plant's strong antibacterial properties. A topical application of the leaf paste is believed to prevent wound infections and promote healing. This ethnobotanical use has been validated by scientific research, which has demonstrated that extracts from the leaves inhibit the growth of both sensitive and multi-drug resistant bacteria, including Staphylococcus aureus and Escherichia coli.

6. Healing Recipes, Decoctions, and Preparations

Antidiabetic and Renoprotective Leaf Infusion

Purpose: To support blood sugar management and protect kidney health.

Preparation and Use:

1. Take a handful of fresh or dried Sesamum alatum leaves.

2. Boil them in 500 ml of water for about 10-15 minutes.

3. Strain the decoction and allow it to cool.

4. Take 100 ml twice daily to help manage blood sugar levels and support kidney function. This use is supported by research demonstrating its renoprotective and antidiabetic effects.

Root Decoction for Fever and Inflammation

Purpose: To reduce fever and alleviate inflammation.

Preparation and Use:

1. Boil approximately 15 grams of dried Sesamum alatum root in 600 ml of water until the liquid reduces to about 300 ml.

2. Strain the decoction and take 50 ml three times a day to help reduce fevers and manage inflammatory conditions. This traditional use is supported by the plant's demonstrated potent anti-inflammatory activity through NF-kappa-B inhibition.

Antimicrobial Leaf Paste for Wounds

Purpose: To treat wounds and prevent infection.

Preparation and Use:

1. Crush a handful of fresh Sesamum alatum leaves to form a smooth paste.

2. Apply the paste directly to the wound or skin infection.

3. Cover with a clean cloth or bandage.

4. Replace the paste twice daily. This practice is used by rural communities and is scientifically validated by studies showing antibacterial activity in the leaves.

Seed Powder for Diarrhoea

Purpose: To treat diarrhoea and intestinal disorders.

Preparation and Use:

1. Grind the Sesamum alatum seeds into a fine powder.

2. Mix one tablespoon of the seed powder with water or porridge and consume it two to three times daily until the diarrhoea subsides.

Culinary Uses of Sesamum alatum (Winged-Seed Sesame)

Beyond its medicinal applications, Sesamum alatum offers valuable nutritional and culinary benefits, serving as a wild-harvested food source in regions across Africa.

1. Leaves and Young Shoots as a Vegetable

The young shoots and leaves of Sesamum alatum are collected from the wild and eaten as a cooked vegetable, prized for their mucilaginous texture. They are often boiled, sauteed, or added to soups and stews. In Chad, where it is known as Sumsum al rhazal, the leaves are a common part of the diet. This edible use provides a valuable source of dietary fibre, vitamins, and minerals, particularly in rural diets.

2. Seeds as a Food and Oil Source

The seeds are a versatile food source. They are edible raw or cooked, and can be ground into a powder for use as a relish or added to other dishes. A paste is sometimes made and served as a side dish with staple foods like pumpkin leaves. The oil extracted from the seeds is a prized cooking oil. It is used for frying and as a general cooking oil, with a mild, nutty flavour profile. The oil content is high (38-50% of seed dry weight), and its fatty acid profile (rich in oleic and linoleic acid) makes it a healthy and stable option for culinary use.

Foraging and Preparation Notes

Harvesting: The young shoots are harvested from the wild and should be collected early in the plant's growth cycle before they become too tough. The seeds are collected from the mature, beaked capsules when they turn brown and dry. The roots for medicinal use should be harvested responsibly, taking care not to destroy the entire plant population.

7. In-Depth Phytochemical Profile and Clinical Significance of Sesamum alatum (Winged-Seed Sesame)

Introduction

Sesamum alatum, the wild, winged-seed relative of the common sesame, is emerging as a botanical powerhouse, offering a remarkable blend of nutritional value and potent pharmacological potential. For centuries, it has been a vital resource for indigenous communities across Africa, employed as food, oil, and a remedy for a spectrum of conditions from fever and diarrhoea to infertility. The past decade has witnessed a scientific renaissance of this species, with modern research unravelling the complex chemical tapestry that underpins its healing traditions. Its therapeutic identity is increasingly defined by a unique arsenal of bioactive compounds, including distinctive naphthoquinones from its roots and novel lignans from its seeds. Studies have validated its use as an anticancer agent against multiple myeloma, a potent antiparasitic, an antidiabetic, and an antimicrobial agent, providing a solid mechanistic basis for its traditional applications in oncology, infectious diseases, and metabolic health.

1. Naphthoquinones and Anthraquinones: The Anticancer and Antiparasitic Arsenal

Key Compounds: Anthrasesamone A, Hydroxysesamone, Chlorosesamone, 2,3-Epoxysesamone, and novel derivatives.

Pharmacological Profile: The roots of Sesamum alatum are a rich repository of unique naphthoquinones and anthraquinones. A dichloromethane root extract at 20 µg/mL demonstrated complete inhibition of multiple myeloma cancer stem cells (MM-CSCs) and a 90% inhibition of NF-kappa-B. This extract also showed over 80% inhibition of parasites like Leishmania donovani and Trypanosoma brucei rhodesiense at 10 µg/mL. Subsequent isolation studies have led to the discovery of 18 compounds, including new naphthoquinones and anthraquinones with potent antiproliferative activity against multiple myeloma cell lines.

Actions and Clinical Relevance:

· Antiproliferative: These compounds, particularly 2,3-epoxysesamone, exert a powerful cytotoxic effect against cancer cells, specifically targeting the RPMI 8226, MM.1S, and MM.1R multiple myeloma cell lines. This discovery is significant, as multiple myeloma is a haematological malignancy that often becomes resistant to conventional therapies.

· Anti-inflammatory: The inhibition of NF-kappa-B is a key finding, as this protein complex is a master regulator of the inflammatory response. Its inhibition helps explain the plant's traditional use in treating chronic fevers and inflammatory conditions and could also contribute to its anticancer effects, as NF-kappa-B is often dysregulated in cancer.

2. Seed Oil: A Unique Nutraceutical Profile

Key Compounds: Oleic acid, Linoleic acid, Gamma-tocopherol, and unique lignans.

Pharmacological Profile: The seeds of Sesamum alatum yield an oil rich in monounsaturated (oleic acid at 45.1%) and polyunsaturated (linoleic acid at 36.3%) fatty acids. Its tocopherol content is notable, with gamma-tocopherol being the predominant form (21.4 mg/100g oil), known for its potent antioxidant activity. The seeds also contain a unique furofuran lignan, 2-episesalatin, which is a structural analogue of sesamin from S. indicum but with a distinct methoxy substitution pattern.

Actions and Clinical Relevance:

· Antioxidant: The high gamma-tocopherol content contributes to the oil's stability and provides systemic antioxidant benefits, protecting cells from oxidative stress, a key driver of chronic diseases.

· Cardiovascular Health: The favourable ratio of monounsaturated and polyunsaturated fatty acids, similar to that of olive oil, makes this oil a potentially heart-healthy option. Oleic acid is known for its ability to lower LDL cholesterol.

· Anti-inflammatory and Metabolic: Lignans are known for their anti-inflammatory, anticancer, and neuroprotective properties. The unique 2-episesalatin could contribute to the plant's traditional use as an aphrodisiac and for its antidiabetic effects.

3. Antimicrobial and Renoprotective Agents

Key Compounds: Flavonoids, Alkaloids, Glycosides, Saponins (alatoside).

Pharmacological Profile: Extracts from the leaves have demonstrated broad-spectrum antibacterial activity, inhibiting the growth of Staphylococcus aureus and multi-drug resistant Escherichia coli strains, validating the traditional use for wound healing. The aerial parts contain new saponins, such as alatoside, and other compounds that have been linked to the plant's renoprotective and antidiabetic activities.

Actions and Clinical Relevance:

· Antibacterial: The presence of flavonoids, alkaloids, and terpenes in the leaves explains their antimicrobial action. This activity, confirmed in both crude extracts and fractions, supports the ethnobotanical application of treating wounds and intestinal infections.

· Antidiabetic and Renoprotective: The plant's ability to combat Type 2 diabetes and protect the kidneys from diabetic complications is a promising area of research. It is thought to work by reducing blood glucose levels and oxidative stress in the kidneys, thereby preventing the progression of diabetic nephropathy.

An Integrated View of Healing in Sesamum alatum

· For Cancer, Fever, and Parasitic Infections: The root of Sesamum alatum is a potent modern phytomedicine with dual, high-impact applications. Its ability to target multiple myeloma cancer stem cells and inhibit the NF-kappa-B inflammatory pathway makes it a candidate for both cancer and anti-inflammatory therapies. Its activity against Leishmania and Trypanosoma highlights its potential in combating neglected tropical diseases.

· For Diabetes and Kidney Health: The plant stands out for its dual role in managing blood sugar and protecting the kidneys. Its antidiabetic and renoprotective activities make it a promising complementary therapy for diabetes management and for preventing one of its most serious complications: diabetic nephropathy.

· For Diarrhoea, Wounds, and General Nutrition: Its seeds and leaves provide a bridge between traditional medicine and modern science. The seeds offer a nutritious, antioxidant-rich oil and a gentle remedy for diarrhoea. The leaves, with their verified antimicrobial properties, offer a safe and effective treatment for wounds, confirming the wisdom of traditional healers.

Toxicological Profile and Quality Control

Safety Profile: Sesamum alatum is generally considered safe for its traditional culinary and medicinal uses. Its safety is suggested by its long history of use as a food and by research showing low cytotoxicity in certain assays, allowing researchers to establish a safety window for its bioactive compounds. However, as with any medicinal plant, its concentrated extracts should be used with caution. Pregnant or nursing women, as well as individuals with pre-existing conditions, should consult a healthcare professional before use.

Quality Control Parameters: The identification of specific marker compounds, such as anthrasesamone A from the roots, 2-episesalatin from the seeds, and alatoside from the aerial parts, provides a solid foundation for standardising extracts. High-performance liquid chromatography (HPLC) and mass spectrometry can be used to quantify these markers to ensure the consistency and quality of herbal preparations.

Conclusion: Sesamum alatum is a remarkable example of a plant that is rapidly transitioning from a traditional folk remedy to a scientifically validated source of potent pharmacological agents. Its unique blend of anticancer, antiparasitic, antidiabetic, and antimicrobial properties is underpinned by a distinct and valuable phytochemical arsenal. The discovery of its potent naphthoquinones and anthraquinones, the unique profile of its seed oil, and its validated antimicrobial and metabolic activities highlight its immense potential in modern medicine. As research continues, Sesamum alatum stands as a powerful testament to the untapped treasures of the African flora and a promising candidate for the development of new therapies for cancer, infectious diseases, and metabolic disorders.

Disclaimer:

Sesamum alatum is generally considered safe when used in traditional culinary amounts. However, comprehensive toxicological studies on concentrated extracts are limited. Pregnant or nursing women, individuals on diabetic medication, and those with pre-existing health conditions should consult a qualified healthcare professional before using this plant for medicinal purposes. The information provided is for educational use only and is not a substitute for professional medical advice.

8. Reference Books, Books for In-depth Study

· Phytochemistry of the genus Sesamum - for phytochemical and pharmacological profiles

· PROTA: Plant Resources of Tropical Africa - for traditional uses and distribution

· Journal of Natural Products (2022) - for isolation and structure elucidation of anticancer compounds

· Flora of Tropical East Africa - for botanical descriptions

· Flora Zambesiaca - for botanical descriptions

· Planta Medica - for initial reports on antiparasitic and anticancer activities

· Medicinal Plants of Africa - for traditional medicinal applications and ethnobotanical context

9. Further Study: Plants That Might Interest You Due to Similar Medicinal Properties

1. Sesamum indicum (Sesame)

· Species: Sesamum indicum | Family: Pedaliaceae

· Similarities: The cultivated cousin of S. alatum, sharing the same genus and a similar seed oil composition, though with a different lignan profile and a more extensive history of culinary and medicinal use, particularly for its antioxidant lignans (sesamin, sesamolin).

2. Withania somnifera (Ashwagandha)

· Species: Withania somnifera | Family: Solanaceae

· Similarities: A prominent adaptogenic herb, like Sesamum alatum, known for its immunomodulatory, anti-inflammatory, and anticancer properties. It shares the stress-relieving, immunomodulating, and anticancer properties that have been validated in S. alatum.

3. Artemisia annua (Sweet Wormwood)

· Species: Artemisia annua | Family: Asteraceae

· Similarities: A plant renowned for its potent antiparasitic (antimalarial) properties. It shares this activity with Sesamum alatum, which shows significant efficacy against trypanosomes and leishmania, highlighting its potential against neglected tropical diseases.

4. Curcuma longa (Turmeric)

· Species: Curcuma longa | Family: Zingiberaceae

· Similarities: A spice and medicinal plant with powerful anti-inflammatory and anticancer properties, primarily due to curcumin. It shares the ability to inhibit the NF-kappa-B pathway and modulate immune function, similar to the action observed in S. alatum roots.

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