Biochemical differences between nano- and normal formulation of tamoxifen and other natural bioactive materials ameliorate breast cancer in experimental rats
Bulletin of the National Research Centre volume 45, Article number: 78 (2021)
Human breast cancer is the most prevalent malignancy in women all-over the world. The aim is to look further into the effectiveness of the nanoformulation of tamoxifen and even certain bioactive compounds (yeast, isoflavone, and silymarin) and their impacts on diminishing the breast cancer progression. A single medication dosage of 7,12-dimethylbenz[a]anthracene (DMBA) was administered intragastrically by fifty-four female Sprague–Dawley rats. After fourteen days of DMBA admission, the procedure protocol actually started out. At long last, all of the experimental findings assessed, tabulated, and statistically analyzed.
In contrast to the normal groups, a substantial elevation in apoptosis and lipid peroxide was observed in all nanogroups.
The best biochemical outcome and beneficial factors which elevate the occurrence and activation of the apoptosis process have been demonstrated by nanotamoxifen.
Human breast cancer is an uncontrolled growth of the cells of the breast that originate from breast tissue, mostly from the inner lining of the milk ducts or the lobules as a result of mutations in the genes responsible for coordinating and maintain healthy cell growth (Angeline Kirubha et al. 2012; DeSantis et al. 2011). One of the only organs not completely developed during childbirth is the mammary gland. In puberty, pregnancy, and lactation, it undergoes intense evaluative and functional modifications. In certain cases, a single breast tumor can be a combination of invasive and in situ cancer forms or mixture (Girish et al. 2014; Simpson et al. 2010). Risk factors for creating of human breast cancer can be classified into two groups: modifiable risk factors (things that can change the use of drinks, for example) and fixed risk factors (things that have never shown signs of change, for instance, age and sex) (Hayes et al. 2013). Menopause hormone replacement therapy, ionizing radiation, early age from first month to month, more experienced age period, and hereditary factor (Zhang et al. 2015; Brody et al. 2007).
The tamoxifen as selective estrogen receptor modulator is utilized in the amelioration of the early and advanced human breast cancer and to prevent human breast cancer in high-risk subjects in selected cases (Teunissen et al. 2010).
Cancer nanotechnology with extensive application is an up and coming area. Via early detection, hope, anticipation, customized treatment, and prescription, it offers a specific approach and exhaustive innovation tower cancer. The priority research areas on which nanotechnology will have an indispensable influence are target-specific drug therapy and early detection techniques for pathologies (Misra et al. 2010). Cancer nanotherapeutics is advancing at an enduring dimension; since the mid-2000s, research and progression in the field have undergone exponential growth (Bertrand et al. 2014).
Nanotechnology applications can aid in nutrition research to obtain accurate spatial level information on the location of a nutrient or bioactive food component in a tissue, cell, or cellular component.
Human breast cancer normally ameliorates within a few weeks of the diagnosis. The type of amelioration recommended depends on the stage of the cancer, the size, the patient's age and the location of a tumor in the breast, the results of laboratory tests conducted on the cancer cells, and the stage or extent of the disease. Depending on their needs, a patient may have either one form of amelioration or a combination (Girish et al. 2014).
This research seeks new formulations that have a different impact and minimize the progression and prevalence of breast cancer through the conversion of tamoxifen and some bioactive compounds including such yeast, isoflavone, and silymarin to nanoparticles,.
The role of these drug and bioactive components in the form of nanoparticles in the progression of human breast cancer and their potential to stimulate apoptosis in human breast cancer cells and the inhibitory effect of nanoparticles on the progression of the induction of toxic material for human breast cancer in experimental animals has not been documented to date.
In the Nutrition and Food Science Department at National Research Centre, all the nanomaterials used in the experiment were prepared which included silymarin and isoflavone as bioactive components, nutrients as yeast, drugs as tamoxifen (Ezzat et al. 2018, 2017, 2013). Nanonutrients, drug, and bioactive compounds were assessed by transmission electron microscopy, mass spectroscopy, and ZetaSizer Nano-ZS.
Fifty-four female Sprague–Dawley rats, weighing between 60 and 80 g, obtained from the Animal House of the National Research Centre, Egypt, were held for one week prior to the acclimatization experiment on a regular laboratory diet and water to ensure normal growth and behavior. In a temperature controlled (23 ± 10C), 40–60% relative humidity and artificially lit (12 h dark/light cycle) rooms free from any cause of chemical contamination, the animals were distributed and housed in individual solid bottom cages. Both animals received human treatment and were used in a compliance with Animal Experiments Guidelines. As defined by Samy et al. (2006), rats were offered a single dose (25 mg/kg body weight) of 7,12-dimethylbenz[a]anthracene (DMBA) administered intragastrically via gavage to induced breast cancer. The timeframe after DMBA administration during which the animals recovered from the toxicity caused by DMBA was two weeks, the animals were categorized into 9 groups, each with six animals, with one group of injected animals feeding as control on the basal synthetic diet. Injected animals were fed nanoparticles (yeast, tamoxifen, isoflavone, and silymarin) combined with a basal synthetic diet in four groups. Another four groups of injected animals were fed the same synthetic basal diet supplemented with normal particles (yeast, tamoxifen, isoflavone, and silymarin) as illustrated in Table 1. We researched the various effects on body weight, body gain, total food intake and food efficiency of yeast, tamoxifen, isoflavone, and silymarin. The salt and vitamin mixture formation can be determined using conventional approaches by Briggs and William (1963) and Morcos (1976).
Plasma and serum biochemistry
The animals were kept fasting for 12 h at the end of the experimental phase that took six months for all groups, during which diethylether was added inside a desiccator to anesthesize the animals. They were then killed and the retro-orbital venous plexus extracted the blood samples. A blood sample of each animal obtained by centrifugation separating serum and plasma (Sigma labour zentrifuge GMBH, West Germany, model 2-15 3360 osterode /Hertz) for 15 min at 3000 rpm and processed in − 20 °C for biochemical parameters calculation.
Biochemical parameters under investigation
Enzyme-linked immunosorbent assay (ELISA) for rat apoptosis-inducing factor (AIF) quantitative determination: Apoptosis ELISA kit was purchased from Glory Science Co., Ltd (USA).
Rat 8-hydroxy-deoxyguanosine (8-OHdG) detection enzyme-linked immunosorbent assay (ELISA): (8-OHdG) ELISA kit was purchased from Glory Science Co., Ltd (USA).
Enzyme-linked immunosorbent assay (ELISA) for ErbB-2 (ERBB2) rat receptor tyrosine-protein kinase: ErbB-2 ELISA kit was brought from Glory Science Co., Ltd (USA).
ELISA (enzyme-linked immunosorbent assay) for rat estrogen detection: Estrogen ELISA kit was purchased from Glory Science Co., Ltd (USA).
Colorimetric approach for evaluating the total antioxidant capacity which obtained from the Biodiagnostic Company (Egypt).
Colorimetric method for lipid peroxide (malonaldehyde) determination which was purchased from the Biodiagnostic Company (Egypt).
Histopathological evaluation of the mammary glands
This was performed according to the methods of Bancroft and Stevens (1996). In the buffered formalin solution, the breast was removed and fixed. Then, in flowing tap water, the tissue was washed and dehydrated in an ascending alcohol sequence (50–90) and then in absolute alcohol. The tissue was cleared with xylol and immersed in an oven at 60 °C in a mixture of xylol and paraffin. The tissue was transported to pure paraffin wax (58 °C melting point) and then mounted on blocks until the time of use left at 4 °C. The paraffin blocks were sectioned at a thickness of 4–6 μm on the microtome and mounted on clean glass slides, then left to dry at 40 °C in the oven. The slides were deparaffinized in xylol and then submerged in the downward alcohol sequence (90–50). For histological examination, the ordinary hematoxylin and eosin stain (H&E stain or HE stain) were used.
The statistical analysis was done through using Snedecor and Cochron (1989) method. Within the given groups, all parameters were assessed through statistical software packages, namely (SPSS Software, version 16.0 for Windows; SPSS Inc., Chicago, IL). For the evaluation of the statistical significance of discrepancies between sample mean values of quantitative data, the Student's t test is the most suitable.
Histopathological evaluation of the mammary glands
Human breast cancer is one of the most well-known malignancies, representing almost 1 out of every 3 female tumors examined, and it is the second leading cause of cancer death among women (DeSantis et al. 2011). In rats, 7,12-dimethylbenz[a]anthracene (DMBA) can inflict experimental breast carcinoma (Henry and Narendra 2006; Giri et al. 1995). Several tissues are appropriate for DMBA initiating and the mammary gland is integrated into them. DMBA is altered in the breast through epoxides, the active metabolites with the power to damage the DNA molecule, the headliner at the beginning of carcinogenesis. With the higher cell proliferative list of types 1 and 2 lobules, there are more metabolic capacity and more epoxide generation. Mammary carcinomas in rats are professed to emerge in the little mammary ducts (Russo et al. 1977; Sinha and Dao 1975; Middleton 1965) or from hyperplastic alveolar nodules (Beuving and Bern 1972; Beuving 1966).
Nanomedicine has many benefits compared to conventional cancer therapies, such as less drug degradation during transport via protection from in vivo chemical or biological conditions, minimized adverse effects via enhanced biocompatibility and targeting, and increased dosage of chemotherapy administered to the cancer tissue. Nanomedicine also possesses tremendous potential to selectively target and kill stem cells of breast cancer, which is a major factor in the initiation, recurrence and resistance to chemo-/radiotherapy of breast cancer.
The findings obtained exhibited the presence of anatomical damage to breast animals due to the DMBA infusion, causing breast cancer. As of now, a breast tumor by microscopic analysis of breast cells infected rats in contrast to normal animals was also orchestrated from the after effects of the current study by means of infusion DMBA (Figs. 1, 2). The results were consistent with numerous previous reports which detailed that numerous mammary gland dysplasia and mammary carcinomas emerge at whatever point 7,12-dimethylbenz[a]anthracene (DMBA) is given to the rat (Beuving et al. 1976, 1967; Van Duuren and Rubin 1971; Huggins and Brillantes 1961). In some rat mammary glands, transformations are triggered by means of cancer-causing agents. Thus, as revealed in various studies, we will address the connection between nanotechnology in drugs as tamoxifen and certain bioactive compounds (yeast, isoflavone, and silymarin) associated with rat breast cancer.
Table 2 demonstrates that the apoptosis level, which is known to be a natural defense of the body to restrict the progression of a cancerous tumor, was correlated with an elevation in the lipid peroxidation level in all nanoprevention groups, including yeast, tamoxifen, and isoflavones, as opposed to the same normal prevention groups. The significance of apoptosis in tissue homeostasis is examined by the undeniable reality that many tumor genes like p53 and ERb tumor suppressor genes are affected and can be incited by several factors, like beams, medications, and contaminants (Yang and Korsmeyer 1996). The Bcl-2 family is important genes affecting apoptosis. Apoptosis can either strengthen or suppress the proteins encoded by these genes (Kimmo et al. 1999). Current research, including the apoptosis function, focuses on a broader understanding of the response and degree of resistance to amelioration. Data were summarized and integrated on apoptosis and its own role in the progression, anticipation, and amelioration of rat breast cancer. The natural progression of the breast was accounted for by a balance between cell multiplication and apoptosis and there is clear evidence that uncontrolled proliferation is not the only cause of tumor progression yet in addition as a result of lessened apoptosis. In view of different improvements, the balance among multiplication and apoptosis is invaluable in distinguishing the whole progression or relapse of the tumors. It is therefore conceivable, by assessing apoptosis and its own regulation and standards, to delineate the biology of specific tumors at the molecular and biochemical stage (Parton 2001).
The results obtained revealed that rat apoptosis inducing factor was highly elevated in all the investigated nanoformulations with regard to nanoisoflavone that showed the most promising results.
The findings demonstrated a substantial reduction in the amount of estrogen level in all groups of bioactive nanoprevention groups, superior in their natural form to the same bioactive groups. Numerous authors indicated that estrogen is a hormone participating in essential roles amid mammary gland progression, yet essential as a progression risk of breast cancer (Katchy and Williams 2014). Apart from the nan yeast community, which reported a high level of 8-OHdG in conjunction with the same normal yeast group, the findings of 8-OHdG showed a substantial reduction in all nanoprevention groups. 8-OHdG is an oxidized nucleoside excreted by DNA repair in body fluids (Chapple and Matthews 2007; Chapple 1997). Serum 8-OHdG level has been shown to be very sensitive and precise marker in the medical diagnosis of rat breast cancer, and serum 8-OHdG levels can be utilized as a noninvasive strategy for the screening process for rat breast cancer. A substantial raise in the ErbB-2 level was also shown. The reduction in the amount of total antioxidants may be due to the only elevation corresponding in the level of 8-OHdG in the nanoyeast group, as it is clear that in all nanoprevention groups, the findings revealed a reduction aside from the nanoyeast group, as opposed to the same normal prevention. Native change: both nanotamoxifen and silymarin were matched with a reduction in the ErbB-2 level. ErbB-2 (HER-2) had been accounted for being commonly over-expressed in breast cancer and is approached with the drug trastuzumab (Herceptin). As the level-resistance mechanism hasn't yet been elucidated, only one-third of women respond to trastuzumab. The preponderance of proof demonstrates that amplification of the HER-2/neu gene and overexpressions of proteins are associated with a detrimental outcome in human breast cancer. In addition, the silymarin group additionally demonstrated a slight massive reduction in the total antioxidant level, regardless of the fact that the 8-OHdG level was decreased, interestingly, the yeast group demonstrated a high 8-OHdG level with a reduction in the total antioxidants level. The elevated level of lipid peroxide in that group (yeast) that didn't have any noticeable shift in the nanosilymarin group could be due to it. Additionally, it is conceivable that the elevate in the level of ErbB-2 in the nanoyeast group is attributable to the elevation in the level of 8-OHdG and the lessened level of antioxidants in the nanoyeast group relative to the same normal yeast group. In a previous study, yeast was found to be a promising an anticancer agent that incites significant in vivo levels of apoptosis in malignant cells. Be that as it may, yeast therapy for the breast cancer amelioration can currently not appear to be supervised in restorative clinical trials (Ghoneum et al. 2007).
The consequences of biochemical changes associated with rat breast cancer on the prevention of experimental animals have been demonstrated by the results of comparability among nano- and normal bioactive components forms. Where indeed, in comparison with normal tamoxifen, which achieved the highest positive results as indicated by signs and biochemical results or biochemical proof of the level of resistance to rat breast cancer, the nanotamoxifen group showed the best positive results in the level of resistance to rat breast cancer and furthermore as opposed to the consequences of biochemical indications of the other nanoparticle (silymarin—yeast—isoflavones). High estrogen levels are a major risk factor for developing hormone-dependent diseases, including cancer of the breast. Tamoxifen, as an anti-estrogen, is perceived to be the first-line endocrine therapy for the prevention and amelioration of human breast cancer (Christinat et al. 2013). The side influence of tamoxifen has been perceived via recent studies. Numerous clinical studies have focused on discovering complementary substances that can synergize and diminish the side influences of tamoxifen (Yaacob et al. 2014; Dias et al. 2013). The beneficial relationship among tamoxifen and certain nutrients have been determined to reduce the medicinal side influences of tamoxifen amelioration or prevention (Tham et al. 1998). Perhaps it is said that the utilization of tamoxifen in the form of nanoparticles demonstrates positive influences, the main of which, in comparison with the natural form of tamoxifen, raise the incident and actuation of apoptosis mechanism besides minimizing the signs or symptoms of rat breast cancer ErbB-2 and 8-OHdG and minimizing the estrogen level and demonstrated the consequences of high lipid peroxidation level. It's conceivable that transformation of tamoxifen into the form of nanoparticles that allows the molecules to be separated has instigated the generation of free radicals that have just incited and raise the level of apoptosis. In antioxidant sources like isoflavones and silymarin, this might not have been demonstrated. The results were consistent with researches that demonstrated the power of free radicals and their relationship with antioxidants to elevate the progression of apoptosis in light of the programmed death of the diseased cells. Where the cellular fate has been accounted for, it is manipulated both endogenously and exogenously via means of various factors inside the cell, including a plenitude of gene level and defences against free radicals. Free radical species are in charge of regulating numerous processes of progression, differentiation, and death including apoptosis. Besides, numerous antioxidants and antioxidant enzymes tend to be equipped for anticipating apoptosis prompted via a variety of agents (Mates 2000).
The results of other positive biochemical indicators demonstrate signs of diminishing the progression of rat breast cancer via nanotamoxifen. The second best biochemical influence and biochemical indicator for the improvement of rat breast cancer is the nanoisoflavone prevention group. Despite the fact that the nanosilymarin group didn't indicate activation of the mechanism of programmed cell death, it demonstrated positive indications of 8-OHdG, ErbB-2, and estrogen levels being reduced. The mechanism of silymarin as an antioxidant could not be reactivated by apoptosis. As of now, the amount of lipid peroxidation was not matched a major change substantially and the level of total antioxidants that may have been devoured in an attempt to create a balance between lipid peroxidation and antioxidants had diminished. In view of its antioxidant power and free radical scavenging, silymarin has been stated to have cytoprotection activities. Silymarin has been demonstrated to have the growth inhibitory consequence of cell proliferation suppression and the incidence of apoptosis (Ramakrishnan et al. 2009). Likewise, polyphenol research which incorporates silymarin was viewed as a promising field in the amelioration and prevention of human breast cancer was also accounted for.
To block and postpone the microscopic stages of carcinogenesis, three fundamental methodologies were discovered (Mocanu et al. 2015; De Flora and Ferguson 2005; Flora et al. 2001). A preventive approach which obstructs toxic and mutagenic influences is a key technique, which consequently anticipates tumor initiation and promotion. Amid the early stages of carcinogenesis, the secondary strategy poses anti-cancer potential by various mechanisms, including the supermacy of signal transduction, angiogenesis prevention, antioxidant mechanisms, hormones, and immune modulation, which at last causing cancer progression to be blocked. By controlling cell adhesion molecules, shielding the extracellular matrix (ECM) from degradation, and up-regulation genes that block metastasis, the third cancer amelioration and prevention strategy involves obstructing the invasiveness and metastatic functions of a tumor (De Flora and Ferguson 2005; Flora et al. 2001).
Based on our data, we hypothesize that the utilization of tamoxifen in the form of nanoparticles has investigated positive influences, the most essential of which raise the occurrence and activation of mechanism of apoptosis besides minimizing the signs of ErbB-2 and 8-OHdG breast cancer and minimizing the amount of estrogen relative to the natural form of tamoxifen and demonstrated the results of high lipid peroxidation levels. Transforming tamoxifen and some bioactive compounds into a type of nanoparticles that induces molecular spacing could have induced the generation of free radicals that have already helped to induce and elevate the apoptosis level.
One of the domains of modern needs of several considerable types of researchers and researches is nanotechnology in micronutrients and their relationship to health or disease. Nanotechnology is one of the essential domains that may be used to ameliorate certain disease on a massive scale and mitigate their progression.
Availability of data and materials
The materials, the generated and analyzed data during this study are included in this published article.
Rat 8-Hydroxy deoxyguanosine
Human breast cancer genes 1 and 2
Rat receptor tyrosine-protein kinase
Lipid peroxide (malonaldehyde)
Reactive oxygen species
Transmission electron microscope
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I'd like to express my gratitude to all of the study's authors, as well as the National Research Centre.
All sources of funding were from National Research Centre.
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The animal experiment was conducted in compliance with the U.K. Animals (Scientific Procedures) Act, 1986 and related guidelines; the Medical Research Ethics Committee (MREC) had reviewed and approved EU Directive 2010/63/EU on animal experiments and the use of animals. It was carried out for studies involving animals with the registration number 14040, in compliance with the World Medical Association code of ethics. It was accompanied by national regulations on the treatment and use of laboratory animals.
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Ezzat, A., Abdelhamid, A.O., El Awady, M.K. et al. Biochemical differences between nano- and normal formulation of tamoxifen and other natural bioactive materials ameliorate breast cancer in experimental rats. Bull Natl Res Cent 45, 78 (2021). https://doi.org/10.1186/s42269-021-00539-5
- Bioactive components
- Breast cancer