Nigella sativa: Broad Therapeutic Potential for the Treatment of Chronic Disease

Kartikay, Shabnam Ain, Manu Kaushik, Qurratul Ain, Sneha Pandey,                       Mohd Uzair, Ajeet, Cutee & Himani Bansal

Sanskar College of Pharmacy and Research, Ghaziabad Uttar Pradesh 201302

*Correspondence: shabnam.ain@sanskar.org

DOI: https://doi.org/10.71431/IJRPAS.2026.5627  

INTRODUCTION

Cancer is still one of the most significant health issues of our time, and it is the second leading cause of death following cardiovascular disease across the globe. GLOBOCAN estimates that millions of new cancer cases occur each year and a high proportion of this result in death due to the intricacies of cancer pathogenesis as well as limitations in treatments available [1]. While conventional anti-cancer methods for example, surgery, chemotherapy, radiotherapy, or targeted therapy and more recently, immunotherapy, have shown considerable successes in their treatment of cancer, issues of tolerance, toxicity, expense of treatment and resistance development often limit their effective clinical use. As a result of this, there is increasing scientific interest in complementary and alternative ways of treating cancer, particularly those based on plants that have long been recognized for their medicinal properties. The vast majority of current anticancer drugs have been derived directly or indirectly from plants, with reported estimates of over 60% including paclitaxel, vinblastine, and derivatives of camptothecin [6].

Nigella sativa, or black cumin as it is otherwise known, is receiving considerable attention as a medicinal plant with possible pharmacological value among medicinal herbs. It is cultivated in Southwest Asia, North Africa and Southern Europe and its seeds have been used for traditional medicine for more than 2000 years in Ayurveda, Unani and prophetic medicine [8]. In traditional medicine, the seeds and their oil have been utilized to treat a variety of ailments which included asthma, bronchitis, hypertension, infection and metabolic disorders. In Islam, it is described as a universal medicine, “a cure for all diseases except death.” This extensive time of ethnomedicinal use gave rise to scientific inquiry into its pharmacological properties which includes potential antioxidant, anti-inflammatory, antimicrobial, immunomodulatory and anticancer properties [9]. Nigella sativa has shown promising anticancer potential in several experimental studies involving different cancer cell lines [17].

Nigella sativa, commonly known as black cumin or black seed, is a medicinal plant that has been used for centuries in traditional medicine due to its diverse therapeutic properties [10]. Investigations into the phytochemistry of N. sativa have reported over 100 bioactive constituents that are responsible for its medicinal aspects. The most investigated constituent is thymoquinone which is approximately 30 to 48% of the volatile oil [11]. Notably, Nigella sativa and its predominant constituent thymoquinone have been intensely investigated with the anticancer properties. Preclinical studies have indicated cytotoxic and antiproliferative activities across types of cancer [9, 15].

Beyond apoptosis, recent evidence indicates that Nigella sativa also modulates the immune system to exert anticancer effects. Specially thymoquinone enhances natural killer cell activity against tumor cells by stimulating the release of perforin, granzyme B, and interferon alpha, thereby augmenting innate immune surveillance [11]. Thymoquinone plays a key role in inhibiting tumor growth by inducing apoptosis and preventing the proliferation of cancer cells [19]. The extract of Nigella sativa has also been reported to suppress angiogenesis, which is essential for tumor development and progression [22].

Besides being effective as a single-agent, N. sativa has been shown to possess a synergistic effect when used with conventional chemotherapeutics. In gastric cancer cells, for example, N. sativa seed oil and/or extracts were able to significantly increase cytotoxicity and reduce effective doses when used in combination with new synthetic compounds or standard-of-care drugs, such as etoposide, encouraging the idea that the N. sativa may act as a modifier of toxicity or resistance in treatment [16]. New synthetic thymoquinone analogs and thymoquinone nanoparticles have also been synthesized to enhance stability, solubility, and bioavailability, which are limitations for translation in the clinical setting [13].

Development of evidence to support clinical application comes from in vitro and in vivo studies, but there is a growing interest in applying the preclinical evidence in practice. Preliminary clinical trials and observational studies show that N. sativa seed oil or thymoquinone, as an adjunct to standard therapy for cancer, is perceived by patients to improve quality of life and treatment outcomes; this is no different than what has been observed in preliminary clinical trials [9, 15]. Large, multi-institutional, randomized controlled trials will also need to be conducted to establish safety and efficacy profiles. In addition, the antioxidant properties of the plant help protect cells from oxidative stress, which is a major factor contributing to cancer development [24].

The primary bioactive component, thymoquinone, exhibits strong antioxidant and anti-inflammatory properties [10]. Among these compounds, thymoquinone is considered the major active constituent responsible for many of the plant’s medicinal activities [2]. Nigella sativa exhibits strong anti-inflammatory effects by reducing the production of inflammatory mediators in the body [26].

This article aims to provide a detailed synthesis of the most recent evidence of the anticancer properties of Nigella sativa (Black Seed) and its primary bioactive ingredients with discussion of their mechanisms of action and in vitro/in vivo studies and translational implications. This article presents information from the perspective of ethnomedicine, phytochemistry, molecular oncology, and pharmacology to highlight the therapeutic properties of Nigella sativa in cancer prevention and treatment and highlights limitations and future directions for research.

Botanical Description

Nigella sativa also known as black cumin or kalonji which is a member of the Ranunculaceae family. It is an annual flowering plant that originated from Southwest Asia, North Africa and Southern Europe [1,3]. The plant can grow 20–30 cm tall and produces finely divided thread-like leaves and pale blue or white delicate flowers [4]. The fruit is a large, inflated capsule made up of many united follicles, containing many small angular black seeds [6]. These seeds contain volatile oil, resulting in a characteristic aroma as well as a bitter taste [8].

For centuries, the seeds of Nigella sativa have been an important part of traditional systems of medicine, including Ayurveda, Unani and prophetic medicine for the treatment of respiratory illnesses, gastrointestinal disorders, infections, and inflammatory diseases [1,8]. These properties contribute to the prevention of several chronic diseases including cancer, cardiovascular diseases, and metabolic disorders. [28]. The antioxidant activity of the plant helps neutralize harmful free radicals and protects cells from oxidative damage [28]. Nigella sativa has gained significant attention in modern pharmaceutical research because of its ability to treat a variety of diseases affecting different body systems [5]. In Islamic tradition, the seeds have been described as a “cure for every disease except death”, and are held in high esteem as a universal medicine [3,9].

Table 1: Taxonomic classification of Nigella sativa

Phytochemical Profile of Nigella sativa

There are more than 100 compounds have been identified in Nigella sativa seeds which are contributing to its diverse pharmacological properties. These include major bioactive constituents like:

Thymoquinone (TQ): The principal bioactive compound of N. sativa comprising 30 to 48% of its volatile oil [6]. It shows immunomodulatory and anticancer activities [3,8]. Induces apoptosis and modulates reactive oxygen species and suppresses tumor angiogenesis [1, 9].

Alpha Hederin: A pentacyclic triterpene saponin present in the seeds. Exhibits cytotoxic and chemosensitizing effects often acting synergistically with thymoquinone [11,13]. Other important compounds present in Nigella sativa include thymohydroquinone, dithymoquinone, nigellidine, nigellicine, and α-hederin [12]. These phytochemicals work together to produce therapeutic effects in the body through different biochemical pathways [14].

Alkaloids like Nigellidine and Nigellicine: Unique indazole type alkaloids specific to Nigella sativa also known for antioxidant and anti-inflammatory effects with emerging evidence of anticancer activity [4,13].

Other Quinones: Dithymoquinone and thymohydroquinone contribute to antioxidant and cytotoxic properties [6]. Carvacrol and para cymene also enhance antimicrobial and anticancer actions [9]. Nigella sativa seeds are rich in volatile oils, fixed oils, alkaloids, proteins, and saponins, which contribute to its pharmacological actions [7].

Proteins and Peptides: Studies report that seed proteins of Nigella sativa exert pro apoptotic and antiproliferative activity against breast and gastric cancer cell lines [1,15].

Fatty Acids and Nutritional Compounds: Seeds are rich in linoleic acid 47 to 67% as well as palmitic acid and stearic acid [8]. Vitamins like B complex, folic acid and tocopherols and minerals like Ca, Mg, Fe and Zn contribute to nutritional and therapeutic significance [25,16].

Structures of Bioactive Constituents of Nigella Sativa

Fig.1 Structures of bioactive constituents of Nigella sativa

Table 2: Major Phytochemicals of Nigella Sativa and Their Pharmacological Activities

Mechanisms of Anticancer Action of Nigella sativa

1.      Induction of Apoptosis (p53 pathway, Caspase activation)

One of the most reliable anticancer actions of Nigella sativa and its main bioactive agent thymoquinone is to induce apoptosis in tumor cells. TQ modulates intrinsic and extrinsic (death receptor) apoptotic pathways [1,3]. TQ upregulates p53 and other pro-apoptotic proteins such as Bax and downregulates Bcl-2 and survivin [4,18]. TQ stimulates the activation of caspases-3, -7, -8, and -9 and the cleavage of PARP in breast, colon and pancreatic cancer cells [6,9,18]. In models of osteosarcoma thymoquinone induced apoptosis by increasing cytochrome C release and mitochondrial Vdepolarization [18]. Accordinglythymoquinone induces apoptosis preferentially in cancer cells while sparing normal cells and this is a major therapeutic benefit of thymoquinone [8].

2.      Anti-Proliferative Effects

TQ and Nigella sativa extracts inhibit significantly tumor cells proliferation by how the cell cycle was blocked at G0/G1 or G2/M phases [11,15]. Among breast cancer cell lines thymoquinone decreased cyclin D1, and cyclin E and CDK2 expression to stop uncontrolled growth [8,18]. In leukemia and prostate cancer thymoquinone induced sub-G1 arrest which lowered clonogenic survival [4,20]. In additionthymoquinone has been shown to modulate the MAPK and PI3K/Akt pathways which play an important role in regulating proliferation [18,21]. These antiproliferative effects are significant to limiting tumor progression.

3.      Inhibition of Angiogenesis and Metastasis

Metastasis and angiogenesis are hallmarks of cancer progression. TQ effectively blocks both processes [3,9,16]. It downregulates CXCR4 and N-cadherinwhile upregulating Ecadherin [18,20]. In breast and gastric cancers, TQ inhibited epithelialmesenchymal transition reducing invasion and metastatic potential [15]. In osteosarcoma, TQ interfered withNotch, Wnt/β-catenin, and Srcsignaling pathways, reducing tumor angiogenesis and metastasis.This highlights N. sativa’s potential not only to shrink primary tumors but also to prevent dissemination [18].

4.      Oxidative Stress Modulation & Antioxidant Activity

Oxidative stress has a dual role in cancer. At low concentrations it acts as an antioxidant facilitating cellular defense by stimulating SOD, catalase and glutathione peroxidase enzymes [1,13]. At elevated concentrations thymoquinone promotes ROS generation in tumor cells and triggers mitochondrial dysfunction, DNA fragmentation and apoptosis [18,20]. This differential pro-oxidant action in the malignant cells but antioxidant protective effect in the normal cells and explains the tumor specificity of TQ [11].

5.      Epigenetic Modulation / Gene Regulation

New evidence is showing the epigenetic impact of TQ [21, 25]. It downregulates DNMT1 and HDAC activity, which results in tumor suppressor gene reactivation. It modulates microRNAs such as miR34a and miR603 which inhibit their oncogenic targets [18]. It can also modulate transcription factors such as NF-KB, STAT3 and Nrf2, affecting inflammatory and survival pathways. Therefore, it has been suggested that TQ acts as a natural epigenetic modulator with potential usefulness in cancer therapy [8, 21].

6.      Synergistic Effects with Chemotherapeutic Agents

Numerous studies have established that N. sativa works to improve the efficacy of standard therapeutics while simultaneously reducing their toxicity [15,16,20]. In the presence of doxorubicin thymoquinone sensitized resistant breast cancer cells by up-regulating p53, p21, and Bax while down-regulating Akt and Bcl-2 [18]. In a study with cisplatin thymoquinone decreased nephrotoxicity while maintaining cytotoxicity in lung and ovarian cancers [13]. Using gemcitabine thymoquinone enhanced efficacy of the drug in pancreatic cancer by initiating apoptosis and autophagy [18]. Synergy has also been reported with 5-fluorouracil, cyclophosphamide, and tamoxifen. With all these studies in tandem, N. sativa emerges as a strong contender for use as an adjunct in cancer therapy [20,21].

Molecular mechanisms of Nigella sativa action against cancer

Cancers result from aberrant cellular growth resulting from genetic changes. Therefore, any agent that possesses anti-cancer activity, either protects genetic material from alteration, or kills the genetically altered cancer cells. The active ingredients (mainly TQ) from N sativa act on cancer cell to help to kill them through a several molecular pathways fig.2.

Fig.2. Molecular Pathways of Nigella sativa action against cancer

Table 3. Mechanisms of Anticancer Action of Nigella sativa and Thymoquinone

CONCLUSION

Nigella sativa (also known as black cumin) is an extraordinary medicinal plant that melds traditional healing with modern scientific rationale. The primary bioactive compound in N. sativa is thymoquinone in addition to several other phytoconstituents (such as alpha hederin, nigellidine and thymohydroquinone) has considerable anticancer effects mediated through multiple molecular pathways. These effects comprise inducing apoptosis inhibiting cellular proliferation, inhibiting angiogenesis and metastasis modulating oxidative stress, and epigenetically regulating oncogenic signals. Moreover N. sativa may enhance the therapeutic index of traditional chemotherapeutic agents while reducing adverse effects suggesting N. sativa is a candidate for use as a synergistic therapy adjuvant in the treatment of cancer.

Although preclinical and early clinical studies show promise, impediments to full therapeutic translation exist such as variation in extract standardization, a lack of pharmacokinetic studies, and a scarce number of recommendations from large-scale clinical trials. Future studies should aim at standardized formulations, nanoparticle delivery systems, and strategic, clinical studies to substantiate safety, efficacy, and mechanism of action-based integration into standard of care oncology. In conclusion, Nigella sativa represents a multi-targeted natural candidate with considerable potential to prevent and manage cancer; the future may provide advances in evidence-based medicine for phytotherapy in modern medicine.

Structure-Activity Relationship (SAR) studies further support its potential as a source for future drug development. While more clinical research is needed, black cumin remains a promising natural resource for developing safer and more effective treatments for complex, multifactorial conditions.

CONFLICT OF INTEREST

None

ACKNOWLEDGEMENT

The authors would like to express their sincere gratitude to all those who contributed to the successful completion of this exhaustive study. We are deeply thankful to our guide and mentor for their valuable guidance, continuous support, constructive suggestions and encouragement throughout the study. We also extend our appreciation to the management members Mr. Lav Aggarwal, Mr. Kush Aggarwal,              Director Pharmacy- Prof. (Dr.) Babita Kumar for providing the necessary facilities, resources and academic environment that enabled us to carry out this work effectively.

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