Assistant Professor, Faculty of Pharmaceutical Sciences, PCTE Group of Institutes, Ludhiana
Sesamol is one of the naturally occurring phenolic compounds found primarily in sesame seeds and sesame oils. In recent years, it has drawn enormous scientific interest on account of its plethora of therapeutic attributes. Researchers have studied sesamol with a considerable degree of thoroughness to unveil potential health benefits, i.e., it can be considered an agent for the prevention and treatment of diseases. The primary aim of this review is to summarize and scrutinize the current literature on sesamol concerning its antioxidant, anti-inflammatory, neuroprotective, cardioprotective, anticancer, and other pharmacological effects. It examines mechanisms of action and highlight promising preclinical and clinical findings. In addition, it identifies some potential areas for further research. Strong evidence suggests that sesamol may be a potential therapeutic agent for a wide variety of diseases. However, to validate its efficacy and establish the optimal therapeutic dosages in humans, further comprehensive clinical trials are necessary. The present review attempts to provide an overview of the therapeutic landscape of sesamol and stimulate further investigation into its potential clinical applications.
Sesame (Sesamum indicum L.) is an ancient oilseed crop that has been grown for thousands of years in various parts of the world. Its seeds are not only a key ingredient in many culinary traditions but have also been used in traditional medicine for centuries, underscoring their cultural and nutritional importance [1]. Among the many bioactive compounds found in sesame seeds and sesame oil, sesamol (3,4-methylenedioxyphenol) is a prominent phenolic lignan. This compound is particularly significant because it is derived from sesamolin, another component in sesame, which can be converted to sesamol during high-heat processing methods like roasting or frying [2]. Recently, sesamol has attracted considerable interest from researchers and health professionals due to its wide range of biological activities. These include strong antioxidant properties that help reduce oxidative stress in the body, as well as anti-inflammatory effects that may help ease chronic inflammation associated with various diseases [3]. Furthermore, sesamol has shown neuroprotective qualities, indicating potential benefits for brain health and the prevention of neurodegenerative disorders. Its cardioprotective effects suggest a role in supporting heart health, while emerging evidence hints at its anticancer properties, making it a compound of interest in cancer research. The rising interest in sesamol is largely driven by the growing demand for natural, plant-based compounds that offer therapeutic benefits with lower toxicity compared to traditional synthetic medications. This trend towards natural alternatives is especially relevant given the increasing concerns about the side effects and long-term impacts of synthetic drugs [4].
This article seeks to provide a detailed and critical overview of the current literature on sesamol, emphasizing its possible therapeutic uses. It will explore the mechanisms through which sesamol delivers its health benefits, shedding light on the biochemical pathways involved. Additionally, the review will present a comprehensive analysis of both preclinical and clinical evidence that supports the health advantages of sesamol, showcasing key findings from laboratory experiments and clinical studies. Lastly, the article will pinpoint potential areas for future research, stressing the importance of further exploration to enhance the clinical application of sesamol and to fully grasp its therapeutic potential across various health issues. By bringing together this information, the review aims to enrich the expanding knowledge base regarding sesamol and its role in health and medicine.
Chemical Structure of sesamol:
Sesamol, also known as 3,4-(Methylenedioxy) phenol, is a phenolic compound with the molecular formula C7H6O3 and a molecular weight of 138.12 g/mol. Its chemical structure includes a benzene ring that is substituted with methylenedioxy and hydroxyl groups. At room temperature, sesamol appears as a colorless to light yellow liquid. While it is sparingly soluble in water, it is miscible with most oils. Key Properties and Characteristics: Molecular Formula: C7H6O3 Molecular Weight: 138.12 g/mol CAS Number: 533-31-3 Appearance: Colorless to light yellow liquid at room temperature Solubility: Soluble in methanol, partially soluble in water, and soluble in dichloromethane (25 mg/ml). It is miscible with most oils. Sesamol is known for its strong antioxidant activity, which helps protect against free radicals and oxidative stress. It acts as an antioxidant by scavenging free radicals and inhibiting oxidative stress at the molecular level, interacting with reactive oxygen species to prevent cellular damage and lipid peroxidation [5]. Additionally, sesamol can chelate metal ions, which further enhances its protective effects against oxidative damage. In addition to its antioxidant properties, sesamol may offer protective effects against free radicals and has some antifungal activity. It can serve as an intermediate in the synthesis of antidepressants like Paroxetine. Sesamol may also help prevent oil spoilage by acting as an antifungal agent [2]. Furthermore, it finds applications in Ayurvedic medicine.
The therapeutic effects of sesamol are achieved through various mechanisms, primarily involving its interaction with cellular signaling pathways, antioxidant enzyme systems, and specific target molecules. Here’s a closer look at some of the key mechanisms:
Antioxidant Activity: One of the main ways sesamol provides its health benefits is through its strong antioxidant properties. In the course of normal cellular metabolism, reactive oxygen species (ROS) and other free radicals are produced as byproducts. While these molecules are important for various physiological functions, their levels can rise excessively due to factors like environmental stress, inflammation, and certain diseases. When the amount of ROS surpasses the body's ability to neutralize them, oxidative stress occurs, which can cause significant damage to cellular components such as lipids, proteins, and DNA. This oxidative damage is linked to the development of many health issues, including cardiovascular diseases, neurodegenerative disorders, and cancer [6].
Sesamol plays a key role in scavenging free radicals, helping to prevent or reduce oxidative stress. Its chemical structure, featuring hydroxyl and methylenedioxy groups, enables sesamol to donate electrons to free radicals, neutralizing them and lowering their reactivity. This scavenging function is essential for protecting cells from oxidative damage and maintaining cellular balance [3].
Beyond directly scavenging free radicals, sesamol also boosts the activity of the body's own antioxidant enzymes, which are vital for defending against oxidative stress. Important enzymes like superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) are crucial for detoxifying ROS and repairing oxidative damage:
Superoxide Dismutase (SOD): This enzyme facilitates the conversion of superoxide radicals into hydrogen peroxide, which is less harmful. Research has shown that sesamol can enhance the expression and activity of SOD, improving the cell's ability to manage superoxide levels.
Catalase (CAT): Catalase plays a key role in breaking down hydrogen peroxide into water and oxygen, which helps prevent the buildup of this potentially harmful substance. Sesamol's ability to enhance CAT activity aids in detoxifying hydrogen peroxide, thereby reducing oxidative stress.
Glutathione Peroxidase (GPx): This enzyme uses glutathione to convert hydrogen peroxide and lipid peroxides into less harmful substances, which is essential for protecting cellular membranes from oxidative damage.
Research has shown that sesamol can boost GPx activity, further strengthening the body's antioxidant defense system. By scavenging free radicals and enhancing the function of these natural antioxidant enzymes, sesamol takes a comprehensive approach to fighting oxidative stress. This dual action not only shields cells from damage but also contributes to the various health benefits linked to sesamol, such as its potential neuroprotective, cardioprotective, and anti-inflammatory properties. As studies continue to investigate sesamol's mechanisms, its role as a natural antioxidant underscores its potential as a therapeutic agent in preventing and managing diseases related to oxidative stress [6][7].
Anti-inflammatory Activity: Sesamol has notable anti-inflammatory properties, making it a compound worth exploring for various inflammatory conditions. Its effects are mainly achieved by modulating several pro-inflammatory mediators and signaling pathways. A key way sesamol exerts its anti-inflammatory action is by inhibiting the nuclear factor-kappa B (NF-κB) signaling pathway[5][7].
The NF-κB pathway plays a crucial role in regulating immune and inflammatory responses. Normally, NF-κB is kept in the cytoplasm in an inactive form, bound to an inhibitor protein known as IκB. When activated by different stimuli, such as cytokines, oxidative stress, or pathogens, IκB is degraded, allowing NF-κB to move into the nucleus. Once there, NF-κB triggers the transcription of various pro-inflammatory cytokines, including:
Research has shown that sesamol can effectively disrupt the NF-κB signaling pathway. By lowering NF-κB activity, sesamol inhibits the transcription of genes that produce pro-inflammatory cytokines like TNF-α, IL-1β, and IL-6. This modulation results in reduced levels of these cytokines in various tissues, helping to prevent and alleviate inflammation [8].
Neuroprotective Activity: Sesamol has gained attention for its potential neuroprotective effects, which are vital in the context of various neurodegenerative diseases and brain injuries. Its neuroprotective properties stem from several mechanisms that enhance neuronal survival, reduce oxidative stress, and modulate neurotransmitter activity [9].
Cardioprotective Activity: Sesamol has gained attention in cardiovascular research for its potential to protect heart health. Several studies suggest that sesamol may positively impact heart function through various mechanisms, mainly by lowering oxidative stress and inflammation in heart tissue.
Anticancer Activity: Sesamol has attracted considerable interest in cancer research due to its potential anticancer properties, which have been investigated through various in vitro (test tube or cell culture) and in vivo (animal) studies. The compound takes a multifaceted approach to influencing cancer cell behavior, positioning it as a promising candidate for therapeutic applications in oncology.
Therapeutic Benefits and Clinical Data
A series of studies had explored the individual therapeutic potentialities of sesamol in some diseases. Summarized are these findings of:
1. Antioxidant and Anti-inflammation Potentials
Based on these powerful mechanisms of action for sesamol being an antioxidant and anti-inflammatory compound, sesamol was indeed found to possess a lot of efficacy in curbing oxidative stress and inflammation under different settings. In laboratory tests, for example, the drug significantly diminished markers of oxidative stress and augmented the antioxidant defense status in oxidative-stress-treated rats [19]. It was similarly found to dampen pro-inflammatory cytokines production [20].
1.1 Diabetes: In diabetic animal models, sesamol has shown considerable promise in managing hyperglycemia, mainly by improving insulin sensitivity and lowering oxidative stress levels. These effects are particularly vital for diabetes management, as they can help reduce the complications associated with the condition.
1.2 Wound Healing: Sesamol has gained attention as a promising agent in wound healing, primarily due to its strong antioxidant and anti-inflammatory properties. These traits are essential in the intricate biological processes involved in wound repair, making sesamol a valuable ingredient in products designed to improve healing outcomes.
1.3 Arthritis: Research on arthritis models indicates that sesamol can alleviate joint inflammation and pain. It achieves this by inhibiting the production of pro-inflammatory molecules and minimizing cartilage damage. Sesamol has been found to provide symptomatic relief, evidenced by lower markers of inflammation and structural damage.
2. Neuroprotective Effects: The neuroprotective effects of sesamol are attracting considerable research interest, particularly concerning neurodegenerative diseases:
Alzheimer's Disease: Studies indicate that sesamol may help reduce oxidative stress, amyloid plaque formation, and neuronal apoptosis in the brain, which is advantageous for Alzheimer's disease. Animal studies have shown that administering sesamol enhances cognitive functions and decreases pathological markers in the brain. Furthermore, sesamol increases the levels of neurotrophic factors that support the growth and survival of neurons.
Parkinson's Disease: Sesamol offers neuroprotection to the dopaminergic neurons that are significantly lost in Parkinson's disease. It helps reduce oxidative stress and neuroinflammation, which in turn prevents neuronal degeneration. Additionally, sesamol has been shown to improve motor function in models of Parkinson's disease [29].
Stroke: Research indicates that sesamol can lessen the extent of brain damage after a stroke. It is regarded as having strong protective effects against ischemic brain injury, potentially reducing infarct size and promoting neuronal survival. Furthermore, sesamol aids in angiogenesis, which is crucial for repairing damaged brain tissue in stroke patients [30][31].
3. Cardioprotective Effects: Numerous studies have highlighted the cardioprotective properties of sesamol[32]. Ischemic Heart Disease: Evidence indicates that sesamol can mitigate heart damage linked to ischemia/reperfusion. It has been shown to enhance cardiac output, reduce markers of cardiac injury, and minimize infarct size [33][34]. Additionally, sesamol lowers reactive oxygen species, thereby alleviating stress on heart cells [35].
Hypertension: Animal studies have revealed that sesamol exhibits anti-hypertensive effects. This may be attributed to its influence on the nitric oxide pathway or its ability to reduce inflammation [36]. It appears to aid in managing blood pressure and alleviating cardiovascular strain [37].
Atherosclerosis: Research has demonstrated that sesamol can inhibit the development of atherosclerotic plaques by preventing LDL-cholesterol oxidation and reducing inflammation in arterial walls [38]. Its capacity to enhance lipid profiles contributes to the prevention of this condition [39].
Anticancer Applications: The anticancer potential of sesamol is quite promising, though further human clinical trials are necessary.
Breast Cancer: Sesamol has been shown to inhibit the growth of breast cancer cell lines and in animal studies. It induces apoptosis, prevents the migration of cancer cells, and influences cell cycle arrest [40]. Additionally, sesamol enhances the effects of chemotherapeutic agents when used in combination, indicating a possible role in combination therapies [41].
Colon Cancer: Research indicates that sesamol can suppress the proliferation of colon cancer cells by inducing apoptosis and inhibiting angiogenesis.It also appears to lower the risk of metastasis and provide survival benefits in colon cancer models(42)
Leukemia: Studies have demonstrated that sesamol can induce apoptosis in leukemia cells and reduce the proliferation of these cancer cells [42]. It may also promote differentiation, pushing leukemic cells towards maturation and reducing their activity as cancerous cells [43].
Other Possible Therapeutic Uses: Sesamol's therapeutic applications extend beyond those previously mentioned.
Liver Disease: Research suggests that sesamol may help protect liver cells from damage caused by toxins or alcohol. It appears to reduce oxidative stress and inflammation, support liver regeneration, and enhance liver function. This compound may be beneficial in mitigating the effects of liver diseases [17][31].
Kidney Disease: Studies indicate that sesamol can offer protection against kidney damage, often associated with conditions like diabetes or hypertension. It may help lower oxidative stress and inflammation in the kidneys, thereby preserving renal function. Sesamol shows promise in safeguarding kidney health.
Respiratory Disorders: Sesamol may also play a role in treating respiratory diseases. It has demonstrated anti-inflammatory effects in the lungs, which could be beneficial for asthma patients. Sesamol has been shown to reduce airway hyperresponsiveness and inflammation, leading to improved respiratory function [18].
Safety and Toxicity:
While sesamol is a naturally occurring compound, it's important to consider its safety and potential toxicity. Most studies indicate that sesamol has minimal adverse effects. However, many of these studies have been conducted on animals, and further research is needed to evaluate its effects in humans. Generally, studies report good tolerance to sesamol at pharmacologically effective doses, with no significant adverse effects noted. That said, very high oral doses may lead to some toxic effects associated with sesamol[16].
Limitations and Future Directions:
While there is substantial evidence supporting the therapeutic benefits of sesamol, much remains to be explored. Most studies have been conducted in vitro or on animal models, and the effectiveness and safety of sesamol for treating various diseases need to be confirmed through clinical trials involving humans. Further research is necessary in the following areas: Clinical Trials: To determine the best therapeutic dosages and establish clinical effectiveness, well-structured randomized controlled trials should be conducted with sesamol. Bioavailability and Metabolism: More studies are needed to fully understand human pharmacokinetics, including absorption, distribution, metabolism, and excretion (ADME) of this compound, to clarify how the body processes it and how delivery methods can be optimized. Combination Therapies: Investigating the synergistic effects of sesamol when used alongside other drugs or natural compounds is essential. This strategy may improve therapeutic effectiveness while minimizing side effects. Long-Term Effects: Long-term studies are crucial to assess the potential chronic effects of sesamol and to ensure its safety for extended use. Specific Disease Mechanisms: Additional research is needed to pinpoint the specific disease mechanisms and pathways where sesamol can exert its effects effectively. Targeted Delivery Systems: Developing innovative targeted delivery systems could enhance the bioavailability and therapeutic effectiveness of sesamol.
CONCLUSION
Sesamol is a naturally occurring phenolic compound with a wide array of therapeutic properties. It exhibits strong antioxidant, anti-inflammatory, neuroprotective, cardioprotective, and anticancer activities, among others. The evidence indicates that sesamol holds significant promise for the prevention and treatment of various diseases. However, further human clinical trials are essential to confirm its efficacy and safety. By addressing the current gaps in our understanding, we can fully realize its potential.
REFERENCES
Harmanjot Kaur*, Amanpreet Kaur, Sesamol: A Natural Phenolic Compound with Promising Therapeutic Potential, Int. J. of Pharm. Sci., 2025, Vol 3, Issue 5, 2270-2281. https://doi.org/10.5281/zenodo.15407972