Cancer Preventive and Therapeutic Compounds: Gift From Mother Nature E-Book
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Cancer is a major cause of deaths all around the globe. Although numerous anticancer drugs are available, most of them are expensive and have serious side effects. Natural compounds are usually non-toxic and inexpensive. Many such compounds have been identified and explored for their health benefits for centuries, and several nutritional factors derived from natural products have attracted considerable attention as therapeutic agents for the prevention and treatment of cancer. Based on current available research, this ebook focuses on chemopreventive and anti-cancer activities of different natural/dietary compounds present in fruits, vegetable, spices, legumes, nuts, grains, and cereals. Contributions from authors around the world highlight the potential use of such derivatives against cancer treatment by presenting updated information of their biochemical mechanisms. Information in this book is intended for researchers, clinicians, patients, academicians, industrialists, and students seeking updated and critical information for their experimental plans (including clinical trials). The book also creates awareness among cancer patients, nutritionists and laymen about cost effective therapeutic alternatives available for cancer therapy.
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Veröffentlichungsjahr: 2017
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Cancer Preventive and Therapeutic Compounds: Gift From Mother Nature
Edited by
Sahdeo Prasad & Amit Kumar Tyagi
BENTHAM SCIENCE PUBLISHERS LTD.
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FOREWORD
Among various chronic diseases, cancer is one of the most dreaded diseases throughout the world. Despite dramatic improvements in surgical and reconstructive techniques, the overall mortality rates for cancer remain relatively unchanged. To date, numerous screening and preventive approaches have been directed towards cancer, which clearly reflect a decrease in the morbidity and mortality associated with cancer. The screening measures include physical exam and history, laboratory tests, imaging and genetic tests on timely basis. However, primary prevention of cancer is more important to keep cancer away from developing. This includes maintaining a healthy lifestyle and avoiding exposure to known cancer-causing substances. Thus cancer risk can be reduced with healthy choices like avoiding tobacco, limiting alcohol use, protecting skin from the sun and avoiding indoor tanning, eating a diet rich in fruits and vegetables, keeping a healthy weight, and being physically active.
Lifestyle plays an important role in the prevention of this disease. By adopting a diet consisting primarily of whole grains, fruits and vegetables with limited amounts of meat, primarily chicken or cold-water fish, and doing daily exercise, several risk factors can be avoided. Various methods are available for the treatment of cancers and the selection will depend on the cost, morbidity, requirement of reliable biopsy specimens, resources available, etc. Thus management of cancer by self-care could be a great potential to improve detection and the treatment of cancer; morbidity and mortality also will decrease as a result. The field has broad and wide applications and with every new development reported in leading peer-reviewed journals across the globe, the opportunities only become wider and the hopes brighter.
The editors Dr. Sahdeo Prasad and Dr. Amit Tyagi have done an excellent job of bringing out timely peer-reviewed chapters under the banner "Cancer Preventive and Therapeutic Compounds: Gift From Mother Nature" with contributors spreading across four different continents. I complement the authors and appreciate their efforts in bringing out this comprehensive compilation. It is quite impressive to note that the editors have tried to capture such a wide and dynamic topic in a series of attractive articles highlighting different forms of cancer prevention and treatment research, both existing and newly emerging technologies in the field, approaches, advantages, thoughts from around the world along with potential future prospects. The simplicity of the language and presentation style is very much appealing and impressive.
It is my great pleasure to pen down/write the foreword for this prestigious, multi-authored book compilation withpeer-reviewed chapters. This book will be a valuable resource for the scientists and students seeking updated and critical information for their experimental plans. It will be very useful for the clinician to develop clinical trials using natural compounds with or without existing therapeutic drugs. Pharmaceutical companies could design new formulations based on the literature available in this new book. Most importantly, normal population and cancer patients can be benefited by knowing the preventive and therapeutic efficacy of natural
compounds. They can use these natural compounds in their routine life. This book could be a major breakthrough worldwide for the readers, particularly the cancer patients.
PREFACE
Cancer is one of the leading causes of deaths around the world and it is globally increasing. The highest incidence rates are in the developed countries such as the USA, and the lowest rates are found in developing countries. These differences in incidence rates appear to be attributable to geographical differences in diet and environmental exposure. Although environmental and genetic factors are the major risk factors for cancer, lifestyle also contributes to the development of this disease. Although screening modalities for early detection and therapeutic management of cancer have improved considerably, this disease still needs better treatment modalities. Since long-term use of cytotoxic chemotherapy and radiotherapy can have severe side effects and since tumors can develop resistance to these therapies, agents that can overcome tumor resistance, enhance the therapeutic efficacy of existing drugs and can control multiple signaling pathways are needed to treat cancer.
Although numerous anticancer drugs are available, most of them are expensive and have serious side effects. Thus, the challenging task of finding an alternative cancer treatment measure has become more important than ever to both scientists and physicians. Since natural compounds have been identified and explored for their health benefits for centuries, several nutritional factors have attracted considerable attention as modifiable risk factors in the prevention and treatment of cancer. Natural products are important sources of anti-cancer lead molecules; even many successful anti-cancer drugs approved by FDA are natural products or their derivatives. Still many more are under clinical trials. Based on the current available research, the present book will focus on the chemopreventive and anti-cancer activities of different natural/dietary compounds such as fruits, vegetable, spices, legumes, nuts, grains, and cereals highlighting their potential use against cancer treatment. Since these natural compounds including fruits and vegetables contain a wide variety of phytochemicals, they may have anti-carcinogenic effects. Evidences showed that the phytochemicals present in fruits and vegetables modulate large numbers of cell signaling molecules linked with cancer. The modulation of signaling molecules controls the abnormal growth of cells and ultimately controls the growth of cancer. Also antioxidative and anti-inflammatory properties of natural compounds could hold promise for cancer chemoprevention because oxidative stress and chronic inflammation play important roles in cancer development.
This book is the culmination of the efforts of several researchers, scientists, graduate students and post-doctoral fellows across the world. In this book authors focused on the role of natural compounds in the prevention and therapy of various cancers. The book has enormous scope and will benefit multiple audience including researchers, clinicians, patients, academicians, industrialists, and students. The editors are also thankful to Bentham Publisher and their team members for the opportunity to publish this book. Lastly we thank our family members for their love, support, encouragement and patience during the entire period of this work.
List of Contributors
Dietary Agents: Effective and Safe Natural Assets Against Cancer
Sahdeo Prasad*,Amit K. TyagiAbstract
Cancer stands as the second most common cause of disease-related death in humans. Although numerous anticancer drugs are available, mostly they are expensive with serious side effects. Thus, the challenging task of finding an alternative cancer treatment measure has become more important than ever to both scientists and physicians. Since natural compounds are known for their various health benefits for centuries, several nutritional factors have brought considerable attention as modifiable risk factors in the prevention and treatment of cancer. Based on currently available research, the present chapter focuses on the chemo preventive and chemotherapeutic properties of different natural/dietary compounds such as fruits, vegetable, spices, nuts, legumes, cereals and grains highlighting their potential use against cancer treatment. The molecular mechanisms by which theses dietary compounds inhibit cancer development and induce cell death are also included to a certain extent.
INTRODUCTION
Cancer is one of the major health problems not only in the United States, but also in many other countries of the world. At present, 1 in 3 women and 1 in 2 men in the USA will develop cancer in their lifespan [1]. Although radiation-therapy, surgery and chemotherapy are the standard ways to treat most kinds of cancers, reoccurrence of cancer and resistance to chemotherapeutic drugs have become major impediments for treating cancer. Moreover, multidrug resistance of cancer is now considered a main reason for the failure of chemotherapy [2]. Alternatives
that are inexpensive, effective, and safe compared with synthetic chemo-therapeutic agents are profoundly required. An abundance of epidemiological, clinical and experimental evidences have shown that use of the compounds from natural sources play an important preventive and therapeutic role in the etiology of human cancers (Fig. 1).
Fig. (1)) Chemo preventive and therapeutic effects of dietary compounds against various cancers.Natural compounds are known for important resource of lead molecules against various diseases including cancer. Many drugs against cancer approved by FDA are originated from natural products or their derivatives. Still several natural compounds are under clinical trials. These natural products include fruits, vegetables, legumes, cereals, and nuts, which are being routinely consumed by human (Fig. 2). The anticancer compounds are usually present in any part of the plant such as roots, leaf, bark, flower, fruits etc. Accumulated data from preclinical and clinical studies revealed that these natural compounds are chemically diverse because they can act at several stages of tumor development. In this chapter we discuss some selected type of cancer preventive and therapeutic compounds provided by Mother Nature.
Fig. (2)) Selected cancer preventive and therapeutic compounds provided by Mother Nature.FRUITS AND VEGETABLES
Varieties of phytochemicals are reported to found in fruits and vegetables, which could have potential against the cancer. These phytochemicals have antioxidant and anti-inflammatory activities, which contribute to the prevention of tu-morigenesis. Because chronic inflammation and oxidative stress are associated with the development of cancer, fruits and vegetables with these properties hold promise for cancer chemoprevention. These phytochemicals in fruits and vegetables can help prevent cancer [3]. The phytochemicals present in fruits and vegetables modulate large number of cell signaling molecules those linked with cancer. The modulation of signaling molecules controls the abnormal growth of cells and ultimately controls the growth of cancer.
A large number of laboratory studies have revealed that phytochemicals from fruits and vegetables inhibit every step of cancer development and thus display chemo preventive and chemotherapeutic potential against cancer cells. These phytochemicals exhibit anticancer activity against varieties of cancers including lung carcinoma, oral cancer, leukemia, breast cancer, multiple myeloma, head and neck cancer, prostate cancer, pancreatic and other cancer. Ursolic acid, found in various fruits, inhibits growth and proliferation of colon, multiple myeloma, leukemia and others through multiple pathways [4]. Indole-3-carbinol from cruciferous vegetables also inhibits growth and reverses the multidrug resistance of leukemic cells [5]. Resveratrol suppresses survival, growth, proliferation, and metastasis of pancreatic cancer through inhibition of the inflammatory molecules such as NF-kappaB, STAT3 as well as expression of various other cell signal molecules including Bcl-2, cFLIP, cyclin D1, CXCR4, MMP-9, ICAM-1, and VEGF [6].
Date palm fruits (Phoenix dactylifera L.), which is a rich source of dietary fiber and polyphenols, has been found to inhibit Caco-2 cell growth. The study suggests that intake of date are helpful in the maintenance of bowel health also reduce the incidence of colorectal cancer in human [7]. Betulinic acid, present in sour jujube fruits, induces apoptosis in breast cancer MCF-7 cells. This indicates that consumption of sour jujube fruits may reduce the occurrence of breast cancer [8]. Strawberry fruit has shown anticancer activity in leukemia (CEM) and breast cancer (T47D) cell lines [9]. These data suggest that there are numerous other compounds from fruits and vegetables have efficacy against cancer cells.
Based on in vitro experiment, animal studies were conducted to validate whether fruits and vegetable are effective in the body systems. In mice models, strawberry fruit has shown cancer therapeutic and chemo preventive potentials against breast cancer. When breast adenocarcinoma bearing mice were treated with strawberry fruit extract inhibited the growth of cancer cells and resulted in an extended life [9]. When treating colorectal cancer, ursolic acid inhibited tumor growth and chemo sensitizes to chemotherapeutic drugs in a nude mice model [4]. In an orthotopic mouse model of human pancreatic cancer, resveratrol found to be inhibiting pancreatic tumor growth and this inhibitory effect of resveratrol was further increased by the treatment of gemcitabine [6]. γ-tocotrienol found in palm fruit not only inhibited growth of pancreatic tumor cells, but also inhibited tumor development and enhanced the gemcitabine-induced inhibition of human tumor cell growth in an orthotopic nude mouse model [10]. Lupeol, which is present in various fruits, inhibits skin tumor growth in mice [11] and hepatocellular carcinoma [12]. Another compound, luteolin, found in several fruits and vegetables, have shown potent antioxidant and anti-inflammatory activity. When luteolin was used to treat nude mice with human bronchial epithelial (BEAS-2B) cells, tumor incidence was reduced compared to a control group [13]. Thus numerous other data indicate that polyphenols present in various vegetables and fruits have the potential to fight cancer.
Epidemiological studies have also been examined to determine the relationship between intake of fruits and vegetables and incidence of various cancers. Low consumption of fruits and vegetables are linked with high risk of cancer as observed in both prospective and retrospective studies. In diagnosed cases of lung cancer of male smokers in China, it has been observed that intake of fruits and vegetables rich in vitamin A and/or carotenoids had lower incidence of cancer. However patients with low consumption of yellow and green vegetables had significantly increased lung cancer [14]. Another cohort study with retirement community initially had no cancer, some cases were found to be diagnosed with cancer. In women, reduced cancer risks were noted for those who ate all vegetables and fruits rich in vitamin C [15]. Fung et al. [16] also found that consumption of high amount of fruits such as berries and peaches leads to lower risk of estrogen receptor negative breast cancer in postmenopausal women.
In a population-based, prospective cohort study a strong link between con-sumption of fruits and vegetables with lung cancer risk were found. Furthermore, the intake of carotenoid-rich vegetables among 61,491 adult Chinese men is associated with lower risk of lung cancer [17]. Other prospective data from a cohort study done in the Netherlands showed a relationship between high intake of fruits and vegetables with lower risk of head-neck cancer. In a 20.3 year follow-up study, it was found that the 120,852 participants showed inverse association with fruit and vegetable intake and head and neck cancer risk. However, no significant association was found [18]. These studies indicate that the probably polyphenols present in the fruits and vegetables are fighting against cancer development.
The response of vegetables, fruits, and carotenoids with cancer development was also reported to be different with different races and sexes. In a study of smokers in United States, consumption of fruits, vegetables, and carotenoids by white females had significantly lower risk of lung cancer, while white males had a non-significant association, and black females showed an inverse association just with vegetables. However, associations between consumption of these dietary agents with association of lung cancer risk were not found in black males. This study indicates that intake of fruits and vegetables along with carotenoids may be helpful in the prevention of lung cancer in smokers [19]. Another study also revealed that consumption of higher amount of fruits and vegetables is associated with a modest reduction of primarily cardiovascular disease and not significant reduction of cancer [20]. However, routinely consumed fruits vegetables have not shown any potential carcinogenicity.
The reason behind this is a subject of investigation. Besides these, numerous other studies also found no association of cancer risk with consumption of fruits and vegetables. However, intake of fruits and vegetables, at least, did not adversely affect cancer risk. Conclusively, appropriate intake of fruits and vegetables could prevent the cancer risk without causing any side effects.
Moreover, fruits and vegetables have been tested clinically in cancer patients. For example, resveratrol against colorectal cancer (NCT00433576), hepatocellular carcinoma (NCT01476592); ursolic acid against benign prostate hyperplasia (NCT02702947); tocotrienol against lung cancer (NCT02644252, NCT-00002586), head and neck cancer (NCT00054561), bladder cancer (NCT-00553345, NCT00553124). Besides these several other natural compounds have used to treat cancer patients (https://clinicaltrials.gov). These compounds have shown potential against the cancer without any adverse side effects and recommended for their further use.
LEGUMES
In many regions of the world, legumes are considered as part of traditional diet. Accumulated studies revealed that legumes such as pulses have cancer preventive properties because of the polyphenols present in the legumes. The most widely studied phytochemicals isoflavones are found in soybeans, which has enormous activity against cancer. The isoflavones such as equol, daidzein, and genistein obtained from different legumes have cancer chemo preventive properties against wide varieties of cancer. Epidemiological studies revealed that consumption of isoflavone-rich soy-based diet is inversely associated with incidence and mortality from cancer. Besides these, lower reduced incidence rate and mortality of prostate cancer in Asian countries was observed due to high intake of soy isoflavones rich diet in their daily lifestyle. It has been also observed that Asian countries have lower incidence of breast cancer with the putative antiestrogenic effects of isoflavones [21]; however, a study conduced on Western population having low consumption of soy food, no association between soy isoflavones and cancer incidence was observed [22]. Further studies reveal that the age at which people are exposed to soy foods probably latter affect the incidence of cancer in those populations. It has also been found that consumption of high amount of soy during adolescence could reduce the risk of breast cancer incidence later in life [23, 24] however, consumption of soy late stage of life may not be effective in preventing breast cancer [22].
A case-control study conducted in Uruguay between the year 1996 and 2004, with 3,539 cancer patients and 2,032 control cases, a strong association between legume consumption and the cancer risk were observed. Consumption of high amount of legumes was found to be linked with a reduced risk of various cancers such as colorectum, stomach, upper aerodigestive tract and kidney cancer [25]. Numerous other studies showed that the regularly legumes and beans consuming population have reduced risk of colorectal adenomas. In a 6-year prospective study with 32,051 non-hispanic, white, cohort members, an inverse relation between bean consumption and incident of colon cancer was found. People who were consuming legumes at least two times in a week the risk of colon cancer incidence reduced to half [26]. How beans prevent the risk of cancer is not very much illustrated. However, numerous studies have shown that legumes target several cell signaling molecules. It has also been shown that the fiber and resistant starch present in the beans and other legumes pass into the large intestine, where they further ferment into short chain fatty acids like butyrate. This butyrate probably exhibits cancer-preventive actions in the colon [27, 28].
Experimental studies conducted by using cancer cells and animals models also revealed that legume component such as daidzein, genistein, equol and other display cancer chemo preventive activity through the regulation of cell growth and proliferative molecules. Daidzein, a soy flavonoid, inhibits cell growth by arresting cell cycle and inducing apoptosis of colorectal, cervical, ovarian and several other cancer cells [29, 30]. In animal model of cancer, daidzein and its metabolite equol exhibited potential in suppressing mammary tumors growth [31]. Genistein also shown chemo preventive and therapeutic potential against wide varieties of cancer by acting at several steps of cancer development such as cell survival, proliferation, metastasis as well as induction of apoptosis [32]. Genistein and its related isoflavones also inhibit growth and development of stomach, bladder, prostate, lung, and hematopoietic cancer induced by chemical carcinogens [33]. In addition, many experimental and epidemiological results with the mechanism of action revealed that these compounds have cancer chemo preventive and therapeutic properties. Thus, these evidences provide the opportunity to scientist around the world to explore the importance of these phytoestrogens present in legumes against cancer and other chronic diseases.
GRAINS AND CEREALS
Grains and cereals are routinely consumable diet, which include rice, wheat, corn, rye, oats, barley, millet etc. Consumption of grains and cereals are found to be linked with a reduced risk of various common diseases including cancer, obesity, heart disease and type 2 diabetes. Long back ago in 1930s the association of wholegrain food intake and cancer prevention has been studied UK population where they found that consumption of whole meal bread prevents the cancer risk [34]. In contrast, refined grains were proportionately associated with the cancer of various organs such as the oesophagus, larynx, oral cavity and pharynx [35]. However, many other findings suggested that cereals and grains containing high fiber reduce the cancer risk.
A case-control study conducted in Northern Italy further provided an evidence that high intake of wholegrain foods has strong relationship with reduced risk of cancer. The study revealed that wholegrain food consumption reduced the risk of several cancer in those include cancer of lungs, liver, mouth, kidney, colon, rectum, pancreas, and blood [36]. Gil [37] also reported that cancers of digestive tract, hormonal, and pancreatic cancer could be prevented by regular intake of wholegrain cereals and foods. Recently, in a case-control study with newly diagnosed breast cancer female patients, it has been found that consumption of wholegrain food more than seven times per week was directly linked with a 0.49-fold reduced risk of breast cancer [38]. In another study, it has been found that intake of wholegrain rye bread, whole-wheat bread and oatmeal, during different periods of life, was linked with the prostate cancer risk, particularly advanced disease [39].
Laboratory studies further disclose the mechanism of anticancer properties of cereals and grains. Barley, a commonly used cereal, exhibited anti-proliferative activity on human leukemia/lymphoma cell lines. Barley extract has shown to cause cell cycle arrest and further cell death mediated by cleavage of caspases and PARP [40]. Another cereal known as millet, exhibited anticancer effects by suppressing proliferation of human colorectal cancer cell lines. The anticancer effect of millet was through preferential ROS accumulation in cancer cells, which appeared to the suppression of NF-E2-related factor 2 (Nrf2), as well as decreased activity of antioxidant enzyme catalase and glutathione [41]. Phytosterols, particularly oxyphytosterols, present in wheat bran have proven to possess antiproliferative properties of colon cancer cells, and thereby contributed to the chemoprevention of whole grain wheat [42]. In addition to these, Jayaram et al [43] showed that pectic polysaccharide present in corn suppressed growth and metastasis of cancer cells by acting at multiple steps of cancer development. This anticancer and antimetastasis property of corn was mediated through regulation of VEGF matrix metalloproteinases 2 and 9 and NF-κB [43].
In animal studies, cereal and grains were found to be effective against cancer prevention. Lignan from wheat bran reported to prevent colon cancer in APC-Min mice model. This lignan metabolites-induced suppression of colon cancer proliferation was mediated through modulation of cytostatic and apoptotic pathways [44]. Millet exhibited an in vivo anti-tumor effect by suppressing xenografted tumor growth in nude mice [45]. In APC-Min mice model of colon cancer, intake of rice bran reduced the burden of adenoma in animals [46]. Along with these, there are numerous other findings suggesting that intake of grain and wheat is directly linked with lower cancer risk. However, numerous other studies also revealed nonsignificant association.
NUTS
Nuts contain high amounts of polyphenols, phytochemicals that have antioxidant, anti-inflammatory properties. These properties potentially participate in protecting from cancer risk. Epidemiological studies suggested a consumption of nuts are directly associated with cause-specific mortality. In a cohort study it has been observed that consumption of nuts are potentially associated with total mortality and mortality due to cancer and cardiovascular diseases [47]. In a case-control study on patients of stomach cancer, consumption of dietary foods including nuts were found to be associated with reduced risk of cancer with dose dependent response [48]. A data obtained from another cohort study with 14000 Adventist men showed that the intake of high amount of fruits, vegetables, beans and nuts statistically reduce the incidence of prostate cancer [49]. Nuts also play a chemo preventive role against cancer in female, which is evident by a prospective study conducted in Tiawan. Observation indicates that consumption of nuts prevents the risk of colorectal cancer in women [50]. Besides these, 27% reduced risk of endometrial cancer was found in Greek women those who were consuming diet rich in nuts, seeds and legumes [51]. Taken together, these studies indicate that intake of nuts are inversely associated with cancer.
In vitro and animal studies also suggest that nuts have preventive effects against tumor growth and proliferation. Lux et al. [52] showed that supernatant obtained from fermentation of some of the edible nuts (almonds, macadamias, hazelnuts, pistachios, walnuts) suppress the proliferation of colorectal cancer HT29 cells also exhibit anti-genotoxic activity. These nuts extracts showed strong antioxidant potential and reduced H2O2-induced DNA damage [52]. Dietary walnuts also suppress colorectal cancer growth in animals. When a diet containing walnuts was given to mice with xenografted human HT-29 colon tumor cells, a significant suppression in tumor development was detected. Walnut-induced inhibition of colorectal cancer growth was mediated by suppressing angiogenesis [53]. Ethanol extract of walnuts induced cytotoxicity to human breast tumor MCF-7 and MDA-MB-231, as well as HeLa cancer cells. The compounds those induced cytotoxicity were identified as Tellimagrandin I and Tellimagrandin II, which was found to be ellagitannin family members. A diet supplemented with walnuts has also shown to decrease the size of human MDA-MB-231 tumor transplanted in nude mice [54]. All these studies indicate that nuts are effective in suppressing human tumor growth either in cell culture, animals or in humans.
SPICES
Since centuries spices have been used for different medicinal purposes including to treat stomach upset, inflammation, infection, wound healing etc in Indian Ayurvedic medicine. However, few decades ago spices explored as an anticancer agent in experimental studies. Spices have the ability to modulate various steps of cell signaling pathways, which are linked to the tumorigenesis. They can inhibit transformation of cells, cancer cell survival, activation of carcinogens, oxidative stress, inflammation and enhance apoptosis of tumor cells. Spices have multi-targeted nature with known mechanisms by which they may serve as anticancer, beat the diseases and boost the health. Till today over 180 bioactive compounds from spices have been identified and investigated for their health benefits to human beings [55]. In this chapter we will deal some of the major spices for their anticancer and health benefit effects.
One of the spices is turmeric, which is widely documented as potent anticancer agent in experimental as well as clinical studies. Curcumin, an active component of turmeric has shown effective as an anticancer agent in clinical trials. Based on over 50 clinical trials using human subjects, curcumin has been found to be both safe and effective against several diseases and disorders including cancer, and other chronic diseases [56]. Garlic also displayed anticancer effects as evidenced by numerous clinical studies. In a clinical trial (RCT, level II), the patients with colon cancer taking aged garlic extract experienced 29% reduction in size and number of adenomas compared to the placebo. In other cohort studies (level II) 5 of 8 cases experienced protective effect by consumption of raw or cooked garlic, however a protective effect for distal colon was observed in 2 of 8 cases by intake of garlic. Meta-analysis (level III) data showed that an inverse relationship with risk of cancer, where consumption of garlic reduced cancer risk by 30% [57]. Besides these, ginger has also reported to be cancer preventive and therapeutic. Recently, we have summarized that ginger and its active components prevent the risk of gastrointestinal cancer. The anticancer properties of ginger was associated with its antioxidant, anti-inflammatory and other biological properties [58]. These studies indicate that spices have the ability to against cancer in humans.
As reported previously, spices are full of various types of antioxidants and anti-inflammatory components. These components mainly include various phenols and flavonoids. In an experimental study with 9 spices (including ginger, caraway, cumin, fennel, pepper, long pepper and others), it has been found that these spices protected DNA damage caused by H2O2 and nicotine in 3T3-L1 (mouse fibroblasts) and MCF-7 (breast cancer) cells [59]. Several other spices and traditionally used medicinal plants such as Fagara leprieuri, Fagara xa-nthoxyloïdes, Mondia whitei and Xylopia aethiopica, have efficacy against cancer. The extracts of these spices were cytotoxic to the breast cancer MCF-7 cell line [60]. Nutraceuticals derived from spices have been reported to suppress growth of different types of cancer cells through the modulation of multiple pathways including inflammatory NF-κB signaling pathway. Curcumin, diosgenin, gamb-ogic acid, capsaicin, ursolic acid, noscapine, sesamin, anethole and eugenol, which are the active components of spices, have shown to inhibit NF-κB [61]. Besides these, various other spice-derived nutraceuticals shon in Fig. (2) have chemo preventive and chemotherapeutic properties. These spices exhibit anticancer properties through the modulation of various inflammatory mediators, growth factors, transcription factors, and protein kinases. Through these studies, it has become evident that spice and spice-derived nutraceuticals have efficacy to prevent the incidence of cancer by modulating various cell-signaling pathways.
Spices have been used with or without conventional drugs for the prevention and treatment of cancer in human. Curcumin was clinically used for the prevention of gastric cancer (NCT02782949), colon cancer (NCT00027495). It was used for the treatment of bone cancer (NCT00689195), breast cancer (NCT02556632), head and neck cancer (NCT01160302) and several other cancers. Other spices including sesame to treat skin reactions from radiotherapy of breast cancer (NCT01688479) have been used (https://clinicaltrials.gov). Several other natural compounds are under the consideration for clinical trial against multiple types of cancer.
CONCLUSION
It is well known that dysregulation of multiple cell-signaling pathways are involved in cancer. Accumulated evidences show that dietary agents can modulate these pathways effectively indicating their enormous potential against cancer. As per the evidences mentioned above, dietary nutraceuticals are fascinating because they exhibit anti-cancer activity without affecting normal cells, thus they warrant greater attention. Instead of it, dietary nutraceuticals have high efficacy against multiple diseases (Fig. 3). They are orally bio-available, have a known mechanism of action, easily accessible, cost effective, and are acceptable to the all region of human population. However, very few clinical studies have been performed so far. Therefore, more clinic studies are required to validate the experimental findings and answer some of unresolved questions, including safety, bioavailability, molecular targets efficacy of these natural dietary compounds before the use of nutraceuticals as part of cancer prevention or a treatment regimen.
Fig. (3)) Beneficial effects of dietary compounds against various diseases.CONFLICT OF INTEREST
The authors confirm that they have no conflict of interest to declare for this publication.
ACKNOWLEDGEMENTS
Declared none.
