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Resveratrol is a promising agent for colorectal cancer prevention and treatment: focus on molecular mechanisms
Cancer Cell Internationalvolume 19, Article number: 180 (2019)
Colorectal cancer (CRC) is the third most common cancer and one of the main causes of cancer death entire the world. Environmental, dietary, and lifestyle factors including red meat consumption, cigarette smoking, alcohol intake and family history are the most important risk factors of CRC. Multiple pathways including inflammation, oxidative stress, and apoptosis are involved in its incidence and progression. Resveratrol, a polyphenolic compound, has different pharmacologic functions including anti-inflammation, cancer prevention, lipid-lowering effect, and hypoglycemic effect. Many studies have proved that resveratrol might also represent a chemo preventive effect on CRC. Thus, the aim of the current review is to depict the role of resveratrol in treatment of CRC in a molecular manner.
Colorectal cancer (CRC) is the third most common cancer global . Hepatic metastasis is the leading cause of mortality in this cancer . CRC has caused about 0.69 million deaths, and its mortality rate is still growing up. The international Cancer Statistic indicated that there are 1.36 million new CRC cases annually entire the world . In Western countries, particularly in the United States, there is a recent decrease in CRC incidence rate that is due to increased screening such as colonoscopy and fecal occult blood test . Enhanced screening contributes to early detection and treatment of precancerous polyps [5, 6] as in high-income countries, the disease prevalence has been stable because of increased screening . CRC treatment still poses a clinical problem while 5-year survival rates are about 65% which depends on tumor situation, stage of tumor detection and therapy . Secular trend studies suggested that lifestyle, dietary, and environmental factors including red meat intake, cigarette smoking, and alcohol intake are the most important risk factors of CRC [5, 9]. In addition, several studies have shown that a family history of CRC elevated the disease risk. Based on the previous observations, present guidelines propose that people with a family history of this cancer should be screened for CRC earlier than those without one . Recognition of new therapeutic strategies may enhance the survival rate of patients with CRC .
Along to various therapies, utilization of natural compounds has been appeared as new horizon in the treatment of a variety of diseases such as cancer [12,13,14]. In this regards, several in vitro and in vivo investigations have shown that phytochemicals act potential antioxidant, anti-inflammatory and anti-carcinogenic roles by modulating certain signaling pathways and molecular biomarkers to stop the incidence and progression of CRC . Resveratrol (trans-3, 4′, 5-trihydroxystilbene) which derivates from the stilbene family of phenolic compounds, exists in berries, pines and nuts, and particularly in red grapes skin . This compound has different pharmacological functions including anti-inflammation, cancer inhibition, lipid-lowering effect, and hypoglycemic effect. Resveratrol inhibits lipid peroxidation and aggregation of thrombocytes thus plays as an anti-oxidant, anti-inflammatory and vasodilation [17, 18]. Recently, it was found that resveratrol instigates autophagy in cancer cells . Resveratrol has been exhibited to raise the release of various pro-inflammatory cytokines from immune cells, which finally promotes cytotoxicity against cancer . This safe and multi-targeted natural agent has been connected with suppression of survival and invasion of cancer cells .
Many studies have proved that resveratrol might also represent a chemo preventive effect on CRC. A recent in vitro study demonstrated that resveratrol in combination with 5-fluorouracil (5-FU), a chemotherapeutic drug, increased the effects of 5-FU via its effects as an anti-metastasis drug on CRC. It was prominent that 5-FU resistant cells were more susceptible to resveratrol illustrating a potential therapeutic strategy for 5-FU resistant CRC . Previous studies also reported that resveratrol increases the anti-cancer activities of the chemotherapeutic agent, oxaliplatin, in cell culture model of CRC. Resveratrol can synergistically increase the effects of oxaliplatin in tumor cell growth suppression .
Given that resveratrol is not considered as primary therapy in the treatment of cancer . Multiple lines evidence indicated that resveratrol could be employed as the secondary line of therapy and primary line cancer therapies alongside resveratrol show significant results [23, 24]. In this regards, a wide ranges of studies confirmed that resveratrol with radiotherapy approaches or chemotherapies could be provided a good therapeutic regimen in the treatment of cancer patients [24, 25].
Metabolic kinetic studies have exhibited that resveratrol have high clearance rate in circulation and low bioavailability [26,27,28], thus its application for CRC inhibition has been highly disputed. Some studies have recommended that the possible reason for low amount of resveratrol in the circulation is that resveratrol induces the phase II metabolic enzymes UGT and sulfotransferase as soon as possible to generate resveratrol glucuronides and resveratrol sulfates [29, 30]. A recent clinical trial has clarified that the level of three resveratrol sulfate conjugates was increased in patients with oral uptake of 0.5–1.0 g resveratrol each day and the progression of tumor cells was remarkably inhibited in them, proposing that daily oral administration of 0.5–1.0 g resveratrol might act a potential role in CRC inhibition . Thus, the aim of the current review is to depict the role of resveratrol in treatment of CRC in a molecular manner.
Resveratrol as an anti-inflammatory agent in CRC
Chronic inflammation is one of the main mechanisms which involved in colon cancer. Therefore, Anti-inflammatory compounds may be beneficial in treatment of CRC. Cytokines are quickly released by damaged tissues and are stimulators of inflammatory response [32, 33]. Very recently studies have indicated that exposure of intestinal cells to cytokines can mobilize inflammatory pathways such as MAPKs, JAK-STAT and NF-kB cascades, raise the expression of pro-inflammatory enzymes, induce the generation of pro-inflammatory mediators and also production of reactive oxygen species (ROS) [34, 35]. Resveratrol decreases pro-inflammatory mediators, such as TNF-α and IL-1β, pro-inflammatory enzymes such as iNOS and COX-2 and inflammatory signaling pathways such as NF-kB (Fig. 1) .
Cancer cell metastasis and invasion are interconnected processes which involve cell proliferation, cell adhesion, cell migration, and proteolytic degeneration of tissue barriers such as the ECM and basal membrane. Multiple proteolytic enzymes which include matrix metalloproteinase (MMPs; especially MMP-2 and MMP-9) [37, 38] and intracellular adhesion molecule (ICAM; especially ICAM-1), take part in the degeneration of these barriers [39, 40]. Some of studies in pancreatic, breast, lung, and colon cancers have exhibited over-expression of MMPs in virulent tissues compared with near normal tissues [41, 42]. Resveratrol diminished the migration and invasion of lung cancer cells due to suppression of NF-κB activation and MMP-2 and MMP-9 expression . Previous studies have demonstrated that resveratrol works as a multi-tasking factor and has anti-inflammatory and anti-cancer functions in CRC [44, 45]. Recent studies have proved that resveratrol inhibits NF-κB-dependent signaling mechanisms . Various pro-inflammatory mediators that have been demonstrated to change the tumor microenvironment, including members of tumor necrosis factor (TNF)-superfamily, are modulated by NF-kB [9, 10]. TNF-α which is generated in the tumor microenvironment, modulates cancer cells, their surrounding stromal cells and the ECM in multiple cancers and acts as an autocrine and paracrine growth factor [46, 47]. Recent study reported that resveratrol suppressed the invasion and viability of CRC cells induced by TNF-α and TNF-β . Another study reported that resveratrol inhibited TNF-β and TNF-α-enhanced survival in CRC cells by increasing apoptotic factors such as cleaved caspase-3 . This study also showed that resveratrol decreased NF-κB activation, NF-κB-dependent carcinogenic gene products (MMP-9 and CXCR4) as well as EMT-related signaling factors including vimentin, slug, and E-cadherin in CRC cells. There is also some evidence which showed that resveratrol can inhibit MMP-9 and vascular endothelial growth factor (VEGF) signaling pathways. Suppression of MMP-9 and VEGF by resveratrol prevents metastasis and angiogenesis [49, 50]. Nitric oxide (NO) is produced by three isozymes of NO synthase. One of these izosymes is iNOS which is inducible by cytokines and pro-inflammatory mediators and is calcium independent while other ones are calcium/calmodulin dependent and constitutively produced . In human and animal models of CRC, it has been indicated that the activation and expression of iNOS is increased suggesting the significant role of NO in colon tumorigenesis . Several studies have also reported that resveratrol decreased iNOS expression in colon cancer cells however its main mechanism is still unclear . Pterostilbene (trans-3, 5-dimethoxy-4′-hydroxystilbene), a structural analogue of resveratrol, exerts an anti-inflammatory action for inhibition of colon carcinogenesis which inhibits p38 MAPK signaling pathway leading to induction of COX-2 and iNOS . In addition, resveratrol is a profitable, nontoxic supplementation and alternative strategy to decrease colitis and strongly colon cancer related to colitis. Resveratrol remarkably develops inflammation score, decreases the amount of neutrophils in the mesenteric lymph nodes and lamina propria, and regulates CD3(+) T cells that release TNF-α and IFN-γ. P53, a marker of inflammation, is also diminished by resveratrol .
Resveratrol inhibits oxidative stress in CRC
At the moment, oxidative stress has been growing up assumed as a main enhancer to carcinogenesis . Several studies have been concentrated on chemo preventive exert of resveratrol as an antioxidant against aging, cardiovascular diseases and cancer. The antioxidant activity of resveratrol is mainly associated with its ability in inhibition free radical production, lipid peroxidation, and modulation of antioxidant-associated enzymes . One of the important antioxidant enzymes is manganese superoxide dismutase, which converts damaging free radical, superoxide, into molecular oxygen and hydrogen peroxide . Resveratrol suppresses the expression of this enzyme and therefore contributes to ROS inhibition . Resveratrol has already represented suppressor effects on peroxynitrite-mediated proteins and lipids oxidation  via up-regulation of SOD , catalase (CAT), glutathione peroxidase (GPX)  and activation of the Sirt1/AMPK and Nrf2 pathways .
Two substantial signaling molecules, the replication factor STAT3 and the protein kinase AKT, have been reported to be over-expressed or activated in most types of human cancers, thus, it is now usually approved that both proteins exhibit reliable goals for new anti-tumor drug design [61, 62]. CRC cell lines were found to represent fundamental activation of survival raising proteins including AKT and STAT3. Resveratrol inhibits AKT and STAT3 proteins that are recognized to have oncogenic ability in CRC . Wallerath et al.  demonstrated that resveratrol might quickly enhance NO generation in cultured endothelial cells. At physiologic levels, NO, as an antioxidant, supports the gastrointestinal mucosa from injuries, prevents leukocyte sticking, and protects mucosal blood flow [65, 66].
Resveratrol decreases CRC cell survival
In carcinomas, it has been discovered that integrin-mediated signaling through focal adhesion provides the cytoskeleton reorganization and supports tumor development, invasion and metastasis . Some studies have demonstrated that accumulation of Focal Adhesion Kinase (FAK) with integrins and cytoskeletal proteins in focal contacts causes elevated cell migration, as well as potential modulation of cell growth and survival [68, 69]. Also, in tumors, FAK has been exhibited to be involved in cell migration, survival, invasion and metastasis, gene expression and tumor stem cell self-renewal . Resveratrol suppresses proliferation and invasion of CRC cells via induction of Sirt1 activity, reduction of NF-κB-mediated inflammatory pathway and inhibition of focal adhesion kinase (FAK) activity, leading to decreased focal adhesion molecules and an elevation in apoptosis . Additionally, resveratrol inhibited invasion and colony forming capacity, cell growth, the expression of β1-Integrin and FAK activation of cells in alginate cancer microenvironment. Resveratrol suppressed NF-kB activation and therefore, inhibited NF-κB-dependent gene end-products which are involved in apoptosis, metastasis and invasion .
One subgroup of transforming growth factor (TGF)-β superfamily, bone morphogenetic proteins (BMPs), acts important roles in the regulation of several key phases of embryonic development, growth, differentiation and apoptosis of different cells . Recent evidence indicated that BMPs take part in cancer progression, such as colon cancer . BMP starts its signaling via phosphatidyl inositol 3-kinase (PI3K)/Akt pathway [74, 75]. P13K/Akt signaling acts a serious role in regulating cell survival and apoptosis  which has been detected over-activated in many tumors to decrease apoptosis and promote proliferation. The tumor inhibitor phosphatase and tensin homolog (PTEN) down-regulates PI3K/Akt signaling and is often inactivated by mutations in several cancer types. Resveratrol reduces the phosphorylation of Akt1/2/3 significantly in CRC cells .
Resveratrol also represented dose-dependent suppression of Wnt signaling pathway, which is one of the important pathways in several serious diseases like cancer. Resveratrol decreases expression of Wnt target genes including cyclin D1 and conducting, and suppresses the development of Wnt-induced cells and Wnt-driven CRC cells . Other studies reported that resveratrol decreases the expression of cyclins D1 and D2, which directly regulate cell cycle progression . These molecules are usually induced throughout malignancy  and inhibited by anticancer phytochemicals . Also, cell cycle arresting by resveratrol in a variety types of cancer cell lines is well recorded . In addition, resveratrol suppresses the activities of various enzymes related to DNA replication and cell proliferation ; these collective effects could be the acceptable reason for the effects of resveratrol on modulation of the cell proliferation .
Clinical trials: resveratrol and colorectal cancer
Despite all documented anticancer features of resveratrol, the majority of the investigations were carried out in pre-clinical and cell-culture methods. Since there are differences in metabolism profile and genetics of humans, and also because the potential properties of resveratrol in animal models cannot be supposed equal to humans, the physiological impacts of resveratrol were also studied in humans.
The toxicity, metabolism, and pharmacokinetics of resveratrol have been evaluated in cancer patients and healthy subjects [85, 86]. Resveratrol is swiftly metabolized, mostly into sulfate conjugates and glucuronide which are excreted through the urine. Due to the low bioavailability because of its extensive metabolism, high doses of resveratrol (up to 5 g/day) have been used by investigators. Mentioned researches have revealed that this polyphenolic compound seems to be safe and well-tolerated. However, adverse effects such as abdominal pain nausea and diarrhea, were seen in individuals consume more than 1 g resveratrol daily . Thus, clinical trials are studying this dose limitation [86, 87]. The poor bioavailability of resveratrol is an important problem regarding extrapolation of its impacts to humans, and different methods have been developed to increase its bioavailability, such as taking it with different foods, utilizing it in combination with an additional phytochemical piperine, as well as using a nanotechnological formulations, micronized powders, or prodrug approach [88,89,90,91,92,93]. Table 1 shows the list of clinical trials on resveratrol and various cancers, including CRC.
An investigation conducted on the pathogenesis of prostate cancer revealed that resveratrol is able to delay cancer recurrence. Approximately 33–50% of patients with prostate cancer experience biochemical disease recurrence after primary therapy. Increasing concentration of prostate-specific antigen (PSA) is the earliest disease recurrence indication. MPX, pulverized muscadine grape skin containing resveratrol, delayed recurrence development by prolongation of the PSA doubling time (PSADT) by 5.3 months. However, these findings were not significant . This investigation is carrying on in phase II clinical trial, so it remains to be observed if MPX is a viable option of therapy. Conflictingly, a second clinical trial implicating resveratrol and prostate cancer certainly concluded that it would not be a viable therapy. Despite pre-clinical data that resveratrol regulates the activity of androgen receptor and decreases androgen generation, Kjaer et al.  indicated that, since it had no impact on PSA levels or prostate volume, resveratrol could not treat prostate cancer. Based on what discussed, it seems improbable that resveratrol will demonstrate to be efficient for prostate cancer therapy, but further clinical trials require to be done to confirm this.
There are other researches that show resveratrol as a tenuous therapy, including in certain multiple myeloma (MM) types. Resveratrol was observed to suppress STAT3, AKT, and NF-κB as well as exerts cytotoxic effects in MM cell lines . SRT501 was examined in subjects with refractory or relapsed MM. Despite convincing evidence of pre-clinical studies that resveratrol contributes to the therapy of MM patients, the clinical trial showed that it caused numerous severe adverse effects, the most prominent of which was renal failure . Since SRT501 had no nephrotoxic effects in a phase I trial, and it was documented to be safe in a phase II study for patients with colorectal cancer, this adverse effects seemed to be MM-specific. These findings show that SRT501 and probably any other resveratrol versions could not be a potential therapy for MM.
Likewise, in clinical trials performed in colorectal cancer patients, the findings seem hopeful, but remain indeterminate regarding whether resveratrol could be an appropriate therapy. It has been revealed that resveratrol suppresses tumor growth and triggers apoptosis in human colon cells in vitro, and murine models indicated that resveratrol suppresses colorectal carcinogenesis and inflammation [98, 99]. Thus, two clinical trials aimed to distinguish resveratrol pharmacokinetics in hepatic metastases or colorectal tissue. After a 2-week resveratrol or SRT501 therapy, in the colorectal cancer tissues of patients, the measured parent resveratrol as well as its main metabolites levels were alike to the effective resveratrol levels utilized in preclinical investigations. However, the anticancer function of the metabolites of resveratrol has yet to be validated, hence it is obscure whether this result provides additional vindication for pursuing resveratrol as a potential therapy for colon cancer. Furthermore, caspase-3 levels, an apoptotic biomarker, and Ki-67 levels, a biomarker of proliferation, were slightly influenced in tissue samples [31, 88]. Although it is proven that resveratrol possesses some pharmacological effects, it is obscure if these effects are considerable enough to make it a beneficial therapeutic material for colon cancer treatment.
CRC is a prevalent cancer and one of the main causes of cancer mortality entire the world. Several factors from genetics to diet are involved in the incidence of this malignancy. Its pathophysiology is heterogeneous which multiple molecules and various signaling pathways including inflammation, oxidative stress, and apoptosis are implicated in its incidence and progression. A number studies have supported the potential effects of resveratrol in CRC treatment. This polyphenol compound represents different properties including antioxidant, anti-inflammatory, apoptosis inducer, and anti-angiogenesis efficacy. Due to these significant effects, resveratrol is suggested as a novel therapeutic agent for cancers. Moreover, some studies reported that consumption of resveratrol in combination with other anti-cancer drugs can increase their effects and also decrease their side effects. Thus, this multi-tasking compound can be a new candidate in CRC treatment however, more human studies are needed.
Availability of data and materials
The primary data for this study is available from the authors on direct request.
phosphatidyl inositol 3-kinase
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The present study was founded by a grant from the Vice Chancellor for Research, Kashan University of Medical Sciences, in Iran.
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This study was considered exempt by the KAUMS Institutional Review Board.
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The authors declare that they have no competing interests.
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