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Central European Journal of Immunology
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Review paper

Immunonutritional support as an important part of multidisciplinary anti-cancer therapy

Karolina Kaźmierczak-Siedlecka
1
,
Agnieszka Daca
2
,
Marcin Folwarski
3
,
Wojciech Makarewicz
1
,
Anna Lebiedzińska
4

  1. Department of Surgical Oncology, Medical University of Gdansk, Gdansk, Poland
  2. Department of Pathology and Experimental Rheumatology, Medical University of Gdansk, Gdansk, Poland
  3. Department of Clinical Nutrition and Dietetics, Medical University of Gdansk, Gdansk, Poland
  4. Department of Dietetics, Pope John Paul II State of Higher Education in Biala Podlaska, Poland
Centr Eur J Immunol 2020; 45 (4): 454-460
Online publish date: 2021/02/04
Article file
- Immunonutritional.pdf  [0.15 MB]
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Introduction

Multidisciplinary anti-cancer therapy includes: pharmacological and surgical treatment, radiotherapy and nutritional support. The types of nutritional treatment are oral nutrition with oral nutritional supplements (ONS), enteral and parenteral nutrition [1]. Recently, special interest is directed towards nutritional immunomodulatory substances, called immunonutrition [2, 3]. The purpose of using these substances is to gain a beneficial effect on the immune system and, consequently, improve the effects of nutritional treatment. The role of immunonutrition mainly involves the supplementation of essential substances that are responsible for the immune system functioning, the control of inflammation and the reduction of the potential risk and effect of SIRS (systemic inflammatory reaction syndrome) in the course of malignancy [1, 2]. According to the European Society for Clinical Nutrition and Metabolism (ESPEN), people with medium and high risk of developing malnutrition (in particular, patients with planned surgery within the upper gastrointestinal tract), should have immunonutrition introduced (e.g. arginine, omega-3 fatty acids and nucleotides) in the perioperative period by the oral / enteral way [4]. The Polish guidelines emphasize the need to use such a mixture (regardless of the patient’s nutritional status) in people undergoing extensive surgery due to neck cancer (laryngectomy, pharyngectomy) and in the case of esophagectomy, gastric and pancreatoduodenectomy [5]. Immunomodulatory components applicable to patients with cancer are presented on the Figure 1 [2, 3].

Fig. 1

Immunomodulatory components used as an immunonutrition in cancer diseases. Own elaboration based on literature [2, 3]

/f/fulltexts/CEJOI/43195/CEJI-45-43195-g001_min.jpg

Arginine

Arginine, one of the basic amino acids, is a substrate for the synthesis of many cellular proteins, ornithine, nitric oxide, polyamines, proline, glutamic acid, glutamine and creatine [6]. It is essential for normal growth and development of children. Its’ endogenous synthesis is sufficient for proper development, growing and functioning as long as it happens under the physiological conditions both in children and adults. Some clinical conditions, especially those with predominant catabolism, including burns and cancer cachexia, characterize higher demand for this amino acid [2, 6]. The endogenous synthesis of arginine takes place mainly in kidneys and enterocytes. However, the main source of arginine for the human body is diet [6]. The plant proteins are especially rich in this amino acid [7].

Arginine takes part in many processes. Amongst them, the participation in the NO (nitric oxide) production seems really important. In vascular endothelium cells, in the presence of NOS (nitric oxide synthase), argi-nine takes part in the synthesis of nitric oxide (NO) as its sole and unique substrate. This mechanism is presented on Figure 2 [7, 8].

Fig. 2

L-arginine role in the production of nitric oxide (NO) and selected properties of NO

/f/fulltexts/CEJOI/43195/CEJI-45-43195-g002_min.jpg

That in itself raised many questions about safety of arginine supplementation in severely ill patients, especially those at risk of sepsis development. But what is important about NO features, is its role not only in sepsis development, but also in arterial vasodilatation, bacterial clearance and immune system cells activation (among them e.g. macrophages, neutrophils, T cells) [9]. That affects various organs microperfusion, oxygen delivery and wound healing [10].

Some scientific data suggest, that arginine is critical for tumor cells development and proliferation, which also posed many questions regarding the wisdom of arginine supplementation in cancer states [6, 11]. Nowadays, especially due to evident proofs that arginine or its’ metabolites influence the thymic production of T cells, functioning of NK cells, granulocytic phagocytosis and in general anti-tumor cytotoxicity [6, 12, 13], the role of arginine in immunonutrition seems to be well established, proved by many clinical trials and meta-analysis [14].

Arginine is the source of ornithine for the synthesis of proline, which is essential for the proper synthesis of collagen. The activity of arginine in macrophages at the tissue damage parts indicates its’ participation in the wound healing process [7]. In an animal model (n = 18) it was shown that a mixture containing arginine (200 mg/kg body mass), glutamine (200 mg/kg) and β-hydroxy-β-methylbutyrate (40 mg/kg) reduces inflammation and positively affects wound healing [15]. In a randomized trial of patients with advanced cancer, it was observed that oral administration of arginine (14 g/day), glutamine (14 g/day) and β-hydroxy--β-methylbutyrate (3 g/day) for 24 weeks increased the lean body mass [16]. The improvement of this anthropometric parameter may suggest that arginine (glutamine and β-hydroxy-β-methylbutyrate) positively affects patient’s nutritional status. But not only lean body mass is affected by immunonutrition. In the study of Braga et al., it was shown that pre-operative administration of preparations containing arginine and omega-3 fatty acids improves body’s immunity and reduces the incidence of infection [10]. Moreover, in a meta-analysis involving 6 studies, including 379 subjects undergoing surgery for head or neck cancer, it was observed that the supply of enteral nutrition combined with arginine at doses of 6.25-18.70 g/l reduced fistulae and shortened hospital stay [17]. Similarly, in the meta-analysis of Adiamah et al., summarizing 16 studies (n = 1387), it was observed that the administration of immunonutrition (omega-3 fatty acids, arginine, nucleotides) in the preoperative period in patients treated surgically for gastrointestinal cancer, reduced the rate of post-operative infectious complications and shortened hospital stay [18]. In addition, the Kanekiyo et al. study showed that the use of enteral immunotherapy (arginine, omega-3 fatty acids, nucleotides) in the preoperative period in patients with esophageal cancer, improves the parameters of nutritional status and reduces the incidence of infections [19].

Despite many potential benefits of using arginine described above, according to the ESPEN guidelines concerning clinical nutrition in surgery, there is no explicit recommendations regarding parenteral and enteral use of arginine in surgical patients [20]. Evidence is insufficient to suggest the supplementation of arginine alone [20]. Moreover, the interaction of dietary supplements enriched with arginine and functional properties of MDSCs (myeloid- derived suppressor cells) is observed. MDSCs are produced in bone marrow under the influence of tumor cell derived substances [21]. MDSCs are heterogenous population of immune cells with immunosuppressive properties. They are classified as granulocytic (G)-MDSCs and monocytic (M)-MDSCs. It is noted that accumulation of these subpopulations is observed in malignancies, sepsis and severe trauma. They show negative effect on T lymphocytes function through arginine depletion and production of nitric oxide [21, 22]. It should be mentioned that arginine depletion causes increased serine biosynthesis, glutamine anaplerosis, oxidative phosphorylation, decreased aerobic glycolysis and as a consequence effectively inhibits Warburg effect, which is described as the production of abundant amounts of lactate in the presence of sufficient oxygen [21]. The Warburg effect is the result of oxygen-induced extensive lactate production in both glycolysis as well as glutaminolysis pathways. It increases the production glucose-derived biomass required for unrestricted cells proliferation and tumor growth [23].

Glutamine

Glutamine is a conditionally essential amino acid, which plays a pivotal role in human body (Fig. 3). Because it is present in abundance in human body and it is not water-soluble, glutamine not always was considered a good candidate for immunonutrition. The participation of this amino acid in many processes however, changed the way it is viewed. Glutamine is an important element of ATP biosynthesis (adenosine triphosphate). As an element of glutathione (after the conversion into glutamic acid), it participates in the protection of the body cells against reactive oxygen species (ROS) [24]. Because it affects the intestinal mucosal integrity and the condition of GALT (gut associated lymphoid tissue), especially when it comes to the inhibition of proinflammatory cytokines production, it is considered a good supplementation for patients during post-surgical trauma [24, 25]. The term „glutaminolysis” is one of the characteristic features of cancer cell metabolism. The transformations of glucose and glutamine in these cells are closely related [26].

Fig. 3

The biological functions of glutamine. Own elaboration based on literature [27]

/f/fulltexts/CEJOI/43195/CEJI-45-43195-g003_min.jpg

Apart from the studies presented above, Chang et al. [28] evaluated the use of oral glutamine supplementation in patients with non-small cell lung cancer (n = 60). Glutamine in a dose of 10 g/8 h received 30 patients. Admini-stration of glutamine reduced the incidence of acute grade 2 and 3 esophagitis due to chemo-radiotherapy (6.7% for glutamine-supplemented patients vs. 53.4% for non-supplemented cohort; p = 0.004). A decrease in weight reduction was also observed (20% vs. 73.3%, p = 0.01) [28].

Supporting nutritional therapy with glutamine improves the quality of life of patients with advanced gastric cancer. The Wang et al. study reported that in patients treated with chemotherapy, when given glutamine in the perioperative period, it protects the intestinal mucosa, as well as regulates the levels of MMP-2 (extracellular matrix metalloproteinase-2) and MMP-9 (extracellular matrix metalloproteinase-9) [29]. It should be emphasized that disturbances in the MMP/TIMP system (between matrix metalloproteinases and tissue metalloproteinase inhibitors), affect the development of many diseases, including cancer [30]. In another study, including patients with gastric cancer (n = 124) after gastrectomy, it was observed that the use of glutamine, in combination with arginine, omega-3 acids, nucleotides, improves the functioning of the immune system [31]. The proportion of CD4+ and CD3+, as well as the ratio of CD4+/CD8+, IgG, IgM, IgA were higher in the group receiving immunonutrition compared to those treated with the standard enteral formulation. In addition, the level of WBC, CRP and TNF-α was lower in the group of patients receiving immunosuppression. There was no statistically significant difference in the parameters of the nutritional status between both groups [31].

Glutamine is a specific nutrient that can be used in patients with HCT (hematopoietic cell transplantation). In the Ziegeler et al. study, it was observed that in patients after HCT, parenteral nutrition in combination with glutamine at a dose of 0.57 g/kg body weight/day reduced infection frequency, improved nitrogen balance and shortened hospitalization [32]. According to the latest ESPEN’s guidelines, there is no specific dose of glutamine recommended to be administered to patients with HCT. According to some studies, the correct dose is 0.6 g/kg body weight/day [4]. In addition, glutamine should be given very carefully to patients with HCT with renal failure [4].

Summarizing the most recent ESPEN guidelines regarding surgical patients, there is no strong recommendations for the use of glutamine. Moreover, there is no convincing evidence to recommend the use of parenteral glutamine. Typically, the use of parenteral glutamine supplementation may be considered in patients who cannot be fed adequately enterally and as a consequence they require exclusive parenteral nutrition. In pancreatic surgery, the effect of glutamine on oxidative stress and inflammatory response is negligible [20].

Omega-3 fatty acids

Eicosapentaenoic acid (EPA) is classified as omega-3 fatty acid. In the Kubota et al. study, it was noted that EPA inhibits the activity of NF-κB – one of the most important nuclear transcription factors contributing in inflammatory response – it activates pro-inflammatory cytokines production leading to e.g. immune system cells proliferation [33]. Apart from that, NF-κB affects also proliferation, angiogenesis and formation of metastasis [33, 34] promoting tumor spreading. As a consequence of NF-κB inhibition, EPA reduces also the production of IL-6 and other pro-inflammatory cytokines, like IL-1 and TNF-α. It induces also apoptosis of esophageal cancer cells TE-1 by activating an oxidative stress in these cells and thereby blocking NF-κB-dependent escape from apoptosis [33]. Gene encoding COX-2 (cyclooxygenase-2) is also under the direct control of NF-κB, consequently EPA reduces the concentration of this enzyme [35]. It was also proved that EPA supplementation reduces the risk for esophageal adenocarcinoma in patients with Barrett’s esophagus [36]. In general, it was proved that increased COX-2 expression is characteristic for inflammation and neoplastic changes [37].

Omega-3 fatty acids are also used in patients after HCT. Oral supplementation of EPA at a dose of 1.8 g/day (3 weeks before transplantation up to 180 days after transplantation) in patients after HCT, reduces the symptoms of GvHD (graft-versus-host disease) [38]. In another study, which was randomized and double-blinded, it has been shown that in patients after HCT, long-term supplementation with omega-3 acids (> 21 days) is particularly preferred. Supplementation with these acids modulates the immune system by reducing the concentration of inflammatory cytokines, such as IL-10 and TNF-α (p ≤ 0.05) [39].

In a meta-analysis by Zhao et al. [40], including 16 randomized trials (1008 patients with gastrointestinal tumors) was reported that parenteral nutrition supplemented with omega-3 fatty acids (at a mean dose of 40.7-2000 mg/kg/day EPA 59.7-2250 mg/kg/day DHA), reduces inflammation and improves the functioning of the immune system. Levels of IL-6, TNF-α, CRP were lower in patients receiving omega-3 fatty acids compared to those in control groups. There was also a statistically significant difference in the incidence of post-operative infections between the study groups. Patients receiving omega-3 fatty acids were less likely to have infections [40]. It was also shown that patients with oesophageal cancer after surgery, additionally treated with omega-3 fatty acids reduce the concentration of proinflammatory cytokines, such as IL-8 [41]. The concentration of 6-keto-PFG1α (the product of spontaneous breakdown of prostacyclin PGI2), which reflects on decreased platelets activation, also decreased. The obtained results confirm not only the anti-inflammatory properties of omega-3 fatty acids, but also their effect on the reduction of platelet aggregation [41].

Immunonutrition with omega 3-fatty acids increased the concentration of omega-3 fatty acids in plasma, however it did not affect overall HLA-DR expression in monocytes or clinical outcome following oesophagogastric cancer surgery [20]. In prospective, randomized, double-blind and placebo-controlled trial, it was shown that oral supplementation with omega-3 fatty acids exerts anti-inflammatory effects in surgical patients with colorectal cancer [42]. Notwithstanding, the risk of postoperative complications was not reduced. Omega-3 fatty acids were incorporated into granulocytes in patients receiving omega-3 fatty acids but it was not associated with improved postoperative clinical outcome [42].

Omega 3-fatty acids (EPA and DHA) supplementation was also assessed in patients with newly diagnosed breast cancer [43]. The patients received 2 g/day of fish oil for 30 days, which contain 1.8 g of omega-3 fatty acids. Supplementation maintained the level of CD4+ T cells and serum levels of hsCRP (high sensitivity C-reactive protein). These results confirm beneficial effects of using EPA and DHA on the immune system and less active inflammatory response in this group of patients [43].

Nucleotide acids

Nucleotides may exist in free and bound form (nucleic acids of RNA and DNA) being synthesized in thehuman body. In order to cover the total demand for nucleotides, it is essential to provide them along with the diet [2]. The deficiency of nucleotides occurs, among others, in diseases with increased catabolism. Nucleotides used as immunomodulatory components for patients diagnosed with cancer, are present mainly in mixtures with other substances (usually arginine, glutamine, omega-3 fatty acids). They affect the maturation, activation and proliferation of lymphocytes [3]. Furthermore, supplementation with nucleotides supports the regeneration of intestinal villi [2].

Preoperative immunonutrition reduces complication rates after salvage surgery in head and neck cancer, which was shown in the most recent Mueller et al. trial [44]. This study included 96 patients (intervention group: 51, control group: 45). The intervention group received (3 units per day for 5 days before surgery) omega-3 fatty acid (1 g/unit), arginine (3.8 g/unit), RNA-nucleotides (0.39 g/unit) and soluble guar fiber (3 g/unit). The use of preoperative immunonutrition significantly reduced the length of hospital stay (6 days vs. 17, p < 0.001) and overall complications (35% vs. 58%). The differences in mortality and hospital readmission weren’t found [44].

Prebiotics and probiotics

According to the definition proposed by WHO (World Health Organization), probiotics are living microorganisms which given in the right dose have a beneficial health effect on the host’s organism [45]. The composition of the gastrointestinal microbiome is closely related to the efficacy and safety of anticancer treatment. Microbiome includes not only bacteria, but also viruses, fungi and archaea. Its’ composition depends on many factors, including type of food intake, used treatment, and taken probiotics [45]. It is worth emphasizing that among the causes of dysbiosis (an imbalance in the normal gut microbiota composition), pharmacological treatment is often mentioned in patients with cancer. One of the methods of interference in intestinal microbiome is the administration of probiotic strains. In the study of Gerbitz et al. [46], on an animal model, the administration of the Lactobacillus rhamnosus GG probiotic reduced bacterial translocation and the incidence of GvHD disease, as well as improved survival after HCT. In another study [47], already in patients undergoing HCT, it was observed that the administration of the same probiotic strain reduced the incidence of GvHD grade 3 and 4, but did not reduce the overall incidence of this disease. In patients with tumors of the gastrointestinal tract treated with surgery, probiotics reduce the incidence of diarrhea.

Probiotics as immunomodulatory components influence the immune system by decreasing the concentration of proinflammatory cytokines (IL-8, TNF-α), which was demonstrated in postoperatively, enterally fed patients with gastric cancer [48]. Furthermore, probiotic strain Lactobacillus plantarum 299v can strengthen the immune protection against viral and bacterial infections. Rask et al. study reported that the administration of this probiotic increased the expression of activation markers on CD8+ T cells and memory cell marker (CD45RO) on CD4+ T lymphocytes [49].

Probiotic strains may inhibit the process of carcinogenesis [50]. In an animal model study, it was observed that the administration of Lactobacillus bacteria reduced the incidence of cancer, regulated the expression of Toll-like receptors, such as TRL-2, TRL-4 and TRL-9 [50]. The stimulation of TLRs is a signal that activates mechanisms of non-specific immunity. TLRs also affect the function of Treg (T regulatory) CD4+CD25+ cells leading to their induction and as the consequence to the suppression of the immune response [51].

Nutritional treatment, which is one of the most important part of anti-cancer therapy, is associated with the occurrence of side effects, such as vomiting, flatulence, stomach pain and diarrhea. Probiotics have the ability to reduce the incidence of diarrhea in patients with gastric cancer who received enteral nutrition after surgery [48, 52].

In addition to probiotics, also prebiotics have the ability to modify the intestinal microbiome. They are defined as non-digestible nutrients that favorably affect the human body by selectively stimulating the growth and activity of bacteria living in the large intestine [53]. They are used for the production of short-chain fatty acids (SCFAs), which when produced in the right amount, favorably affect the maintenance of the intestinal barrier. Butyric acid, which belongs to the SCFA group, has anti-inflammatory properties and stimulates the process of reconstruction of the intestinal epithelium [53].

Conclusions

Immunonutrition (arginine, glutamine, omega-3 fatty acids, nucleotide acids, pre- and probiotics) is a modern method of complementary treatment of cancer. It has a positive effect on the functioning of the immune system, including the ability to react against pathogens, reduce the concentration of pro-inflammatory cytokines and maintain the balance of CD4/CD8 lymphocytes. The knowledge about immunonutrition is still limited. It seems reasonable to suggest standard ONS as a preoperative choice due to higher cost and limited retail availability of immunonutrition. Moreover, there is information available about negative effect of using these immunomodulatory components (such as glutamine in breast cancer). Clinical trials usually assess mixture of few substances and that is why it is hard to determine what is the role of immunonutrient alone. In addition, the optimal components of immunonutrients have yet to be adequately determined and may vary for patients based on the proposed procedures. Further studies should assess the effectiveness, as well as safety of immunonutrition usage in patients with cancer. There is a need for properly design randomized and placebo-controlled trials that stratify patients appropriately and determine the optimal composition and duration of therapy regarding isocaloric and isonitrogenous formulas.

Notes

[1] Conflicts of interest The authors declare no conflict of interest

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