Appraisal of postbiotics in cancer therapy

Abstract

Cancer remains a multifactorial disease with an increased mortality rate around the world for the past several decades. Despite advancements in treatment strategies, lower survival rates, drug-associated side effects, and drug resistance create a need for novel anticancer agents. Ample evidence shows that imbalances in the gut microbiota are associated with the formation of cancer and its progression. Altering the gut microbiota via probiotics and their metabolites has gained attention among the research community as an alternative therapy to treat cancer. Probiotics exhibit health benefits as well as modulate the immunological and cellular responses in the host. Apart from probiotics, their secreted products like bacteriocins, exopolysaccharides, short-chain fatty acids, conjugated linoleic acid, peptidoglycan, and other metabolites are found to possess anticancer activity. The beneficiary role of these postbiotic compounds is widely studied for characterizing their mechanism and mode of action that reduces cancer growth. The present review mainly focuses on the postbiotic components that are employed against cancer with their reported mechanism of action. It also describes recent research works carried out so far with specific strain and anticancer activity of derived compounds both in vitro and in vivo, validating that the probiotic approach would pave an alternative way to reduce the burden of cancer.

Graphical Abstract

1 Introduction

Cancer remains one of the main causes of mortality and creates despair in the human community across the globe (Sung et al., 2021). Along with the growth of population and aging, cancer continues to exist as the leading determinant of mortality compared to heart diseases (Bray et al., 2018). Cancer denotes the uncontrolled growth of cells following the spread to distant organs by metastasis (Ghosh and George, 2023). It is mainly characterized by altered cell signaling and metabolism leading to countless proliferation (Upadhyay, 2020). International Classification of Diseases for Oncology has classified cancer into six main groups based on tissue types, namely, carcinoma, lymphoma, sarcoma, myeloma, leukemia, and mixed type. Even though there are more than 100 types of cancer, the most common cancer type includes breast cancer with an incidence rate of 11.7%, followed by lung cancer at 11.4%, colon cancer at 10%, prostate cancer at 10%, and finally the stomach cancer with 5.5% (Sathishkumar et al., 2022). Compared to other diseases, there are very few treatments for cancer including surgery, chemotherapy, immunotherapy, and radiation therapy (Debela et al., 2021). Despite advances in diagnostics and therapeutics, the number of cancer cases has been increasing in the past 2 decades (Falzone et al., 2018). Reduction in cancer mortality mainly relies on continuous progress in pharmacological fields and the introduction of effective drugs and therapies (Miller et al., 2016).

Human gut harbors trillions of microbes like bacteria, fungi, and yeast that execute favorable tasks to the host (Thursby and Juge, 2017). The microbiota favors the host through a wide range of functions like strengthening and shaping the intestinal epithelium, acting against harmful pathogens, regulating host immunity, and also a part in energy scavenging (Natividad and Verdu, 2013; Gensollen et al., 2016). Gut microbiota has been considered an important organ, due to its communicational axis with the rest of the host’s organs through humoral, endocrine, neural, and metabolic pathways (Ahlawat and Sharma, 2021). Gut microbiota depends on several factors like human lifestyle, age, environmental factors, and diet as it can modulate the microbiome (Afzaal et al., 2022). However, dysbiosis occurs when intestinal bacterial growth and related metabolism are disintegrated. Dysbiosis is the disproportion of the microbial composition that results in the alteration of bacterial metabolic activities in the human gut (DeGruttola et al., 2016). Dysbiosis can result in developing inflammation in the gastrointestinal tract (GIT), diarrhea, neurodegenerative disorders, and even cancer (Asseri et al., 2023). Numerous studies have concluded that dysbiotic microbiome and its derivatives are associated with the cause of inflammatory diseases like IBDs (inflammatory bowel diseases), CVDs (cardiovascular diseases), CKDs (chronic kidney diseases), NAFLD (non-alcoholic fatty liver diseases), and cancer (Afzaal et al., 2022). Therefore, the role of homeostatic gut microbiota and their metabolites play a significant role in human health which has directed researchers to investigate the connections of microbes in metabolism (Cardona and Roman, 2022). The prokaryotic members in a healthy gut are generally friendly and beneficial to health and are probiotics.

Probiotics are beneficial microorganisms that utilize dietary fibres, prebiotics, and secrete metabolites known as postbiotics (Kim S. et al., 2021. Generally, probiotics can be consumed by integrating them into foods like dairy products or non-dairy food forms as additional supplements (Latif et al., 2023). Fermented foods that are consumed comprise active microbes closely similar to the strains regarded as probiotics. These fermented foods enhance their nutritional value by converting substrates into bioactive metabolites (Marco et al., 2017). There are expanding shreds of evidence favoring the beneficial effects of probiotic consumption, including maintenance of gut health, improved immune response, and cancer prevention (Kechagia et al., 2013). Probiotics are widely known as a potential therapeutic agent against many diseases like necrotizing enterocolitis (NEC), acute infectious diarrhea, antibiotic-associated diarrhea (AAD), upper respiratory infections, irritable bowel syndrome (IBS), gastroenteritis, vaginal candidiasis, ulcerative colitis, traveler’s diarrhea, and various allergic diseases (Hawrelak, 2003; Wang et al., 2019; Kumar et al., 2024). Apart from probiotics, postbiotics have been reported to possess health benefits to hosts with several properties including infection control and prevention, induction to apoptosis, mitigation of inflammation, immunomodulation, and reinstating of eubiosis. Postbiotics refer to the bioactive molecules that are released from probiotics as a result of fermentation and cell lysis (Kim Y. J. et al., 2021). Recent research findings have validated the effect of postbiotic components against several life-threatening diseases and disorders.

Current management of cancer treatment involves standard drugs that not only act against cancer cells but also affect normal cells developing resistance towards them and likely related therapies remain under challenge (Raguz and Yagüe, 2008). Side effects are the common outcome of cancer treatment (chemo- and radiotherapy) which reduces the quality of patients’ lives and increases agonies. Probiotics and prebiotics-mediated therapeutics showed promising results in mitigating such unwanted side effects. A study analyzed 20 published clinical trials with probiotics where 17 trials experienced beneficial impact in reducing side effects and three did not show visible results (Rodriguez-Arrastia et al., 2021). Due to chemo- and radio-therapy, non-cancerous normal cells are also induced to malfunction physiologically which may lead to bleeding, anemia, loss of taste, nausea, diarrhea, inflamed mucus, dysbiosis, and many more discomforts (Akbarali et al., 2022). To overcome such situations, there is continuous research to use probiotics as an adjuvant if not directly for cancer therapy. Research outcome shows acceptable information in several clinical trials [Renzis et al., 2007,]. The use of probiotics in mitigating side-effects developed in patients due to cancer treatment is enlisted in Table 1, demonstrating the type of treatment offered to patients with different cancer types and the relative improvement of patient’s quality of life. On the other hand, there is a long list of probiotics that are mostly used as a dietary supplement to maintain good health from different conditions (gas, constipation, diarrhea, oral thrush, IBS, urinary tract infection, vaginal pH imbalance, etc.) though none of the listed drugs is FDA approved but approved by similar other organizations across countries, like World Organisation of Gastroenterology, Therapeutic Goods Administration (TGA), Ministry of Health Malaysia, and Chinese regulatory authority, the State Food and Drug Administration (SFDA) and commercially viable (Table 1) [https://www.drugs.com/drug-class/probiotics.html].

In the act of preventing and treating cancer, probiotics are employed due to their pivotal role in host interactions and conferring health benefits (Legesse Bedada et al., 2020). Since the last centennial, probiotics and their derived metabolites (components of postbiotics) have set up the cornerstone of research against all types of cancer (Nazir et al., 2018). Most reviews have mainly focused on the role of probiotics against colorectal cancer (CRC) however the current discussion reviews exclusively on postbiotics with a general view of probiotics, prebiotics, postbiotics, next-gen probiotics and their preventive roles on different cancers with plausible explanations of underlying mechanisms of action and future directions.

2 Probiotics, prebiotics, postbiotics, and synbiotics

According to the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO) in 2001, “Probiotics are live microorganisms which, when administered in adequate amounts, confer a health benefit on the host” (Hill et al., 2014; Indian Council of Medical Research Task ForceCo-ordinating Unit ICMRCo-ordinating Unit DBT, 2011). Bacterial strains in the genera of Lactobacillus, Lactococcus, Bacillus, Enterococcus, Pediococcus, Streptococcus, and Propionibacterium are considered to be potential probiotic microbes (Hamad et al., 2022). Among them, lactic acid-producing bacteria [LAB] and Bifidobacteria have been explored for a wide range of applications (Figure 1) (Bron et al., 2011). Probiotics produce various products like antimicrobial substances, exopolysaccharides (EPS), short-chain fatty acids (SCFAs), conjugated linoleic acids (CLA), and other metabolites during metabolism, which are directly involved in the benefit of human health (Marco et al., 2017). Probiotics affect the immune responses that are intervened by various immune cells like B and T lymphocytes, dendritic cells, macrophages, and natural killer (NK) cells (Kerry et al., 2018). The innate immune system of the host has been studied against its link to probiotics and revealed that expression of cytokines presented by antigen-presenting cells, augmenting type 1 helper T cell response, and finally activation of natural killer cells (Ashraf and Shah, 2014). Additionally, these probiotic bacteria can have the ability to influence the nervous system by communicating via the gut-brain axis (Morkl et al., 2020). Probiotics are thus considered functional foods with scientific proofs which validate beneficial properties by producing bioactive metabolites for modulating gut microbiota, and immunomodulation (Lin, 2003). Apart from health benefits, the widespread usage of live probiotics is associated with some unwanted health effects among children and adults (Doron and Snydman, 2015). Another concern about using live probiotics is that they might get transported into blood vessels and neighbouring tissues resulting in bacteremia in immunocompromised individuals (Kataria et al., 2009). Similarly, other issues with live probiotics may include the transfer of antibiotic-resistant genes in the human gastrointestinal tract (GIT) (Mater et al., 2008). However, the health-beneficial realms of probiotics and their derivatives are so big and effective, that these demerits are negligible.

FIGURE 1

For the past 2 decades, postbiotics have acquired more attention from researchers to explore their potential applications in medicine (Ali et al., 2023). Postbiotics are defined as the preparation of inanimate probiotics (para probiotics, ghost probiotics), their fermented metabolites, and structural components that confer health benefits on the host (Salminen et al., 2021). The International Scientific Association of Probiotics and Prebiotics (ISAPP) defined postbiotics are “preparations of inanimate microorganisms and/or their components that confer health benefit on the host.” Postbiotic preparations contain probiotic-derived components such as cell lysates, metabolites, peptides, enzymes, vitamins, proteins, exopolysaccharides, and extracellular vesicles (Deshpande et al., 2018). Studies on health beneficial properties of postbiotics reveal that postbiotics possess characteristics and are more advantageous than live probiotics. Probiotics need support for assured shelf life while postbiotics need not. However, probiotics can colonize, and antagonize pathogens by interacting with the host system. On the other hand, postbiotics can pass through the mucous layer quickly, with no risk of infection in immunocompromised individuals, no possibility of antibiotic resistance gene transfer, and are convenient to standardize transport and storage (De Marco et al., 2018). Postbiotics therefore own better choices of their applications in developing several functional foods than probiotics (Vinderola et al., 2022).

On the other hand, prebiotics is another term used for food ingredients like non-digestible, resistant starch, and fibers in human GIT and are good for the growth of gut microbiota. Prebiotics are defined as a “selectively fermented ingredient that results in changes in the composition and activity of gastrointestinal microbiota, conferring benefits upon host health” (Gibson et al., 2017). These ingredients are not digested by humans but become the source of energy harvest, growth, and metabolite production by gut microbiota. Thus, it can modify the gut microbiome and influence the host’s health condition (Rastall and Gibson, 2015). Most of the prebiotics belong to the class of carbohydrates that are present naturally in the human diet (Slavin, 2013). Common prebiotics include oligofructose, inulin, fructo-oligosaccharides (FOS), galactose-oligosaccharides (GOS), and xylose-oligosaccharides (XOS) (Hutkins et al., 2016). These are obtained from natural resources like fruits, vegetables, and grains that are commonly used in day-to-day life. Prebiotics have been reported to reduce the prevalence of diarrhea, irritable bowel syndrome, and even colon cancer (Peña, 2007). Despite this, prebiotics were identified to enhance the bioavailability and uptake of nutrition, and suppression of risk factors of cardiovascular diseases (Pokusaeva et al., 2011). These components are stable, temperature resistant, and can thrive in stomach acids, but may lead to gastrointestinal discomfort (Marteau and Seksik, 2004). Considering differences among probiotics, prebiotics, and postbiotics, all three have functional relationships for the promotion of health benefits of the host (Ji et al., 2023).

Synbiotics refers to the complex mixture of both prebiotics and probiotics formulation to improve human health (Markowiak and Śliżewska, 2017). According to ISAPP, synbiotics are of two types: complementary and synergistic. Synergistic synbiotics consist of a substrate that is specifically utilized by a co-administered microbe, whereas in complementary synbiotics both probiotics as well as prebiotics together confer health benefits independently (Swanson et al., 2020). Several studies have reported that synbiotics stimulate health and nutrition in the host (Yadav et al., 2022). Synbiotics were found to reduce the risk of CVDs and insulin resistance in aged individuals (Cicero et al., 2021).

3 Postbiotics-an endowing anticancer agent

The concept of postbiotics mounted during this decade however terms like postbiotics, paraprobiotics, and fermented infant formulas (FIFs) came into existence in 1986 with increasing growth of research and development, as reviewed elsewhere (Wegh et al., 2019). The postbiotic is a pool of functional components that include cell-free supernatants (CFS), short-chain fatty acids (SCFA), peptides, bacteriocins, exopolysaccharides (EPS), biosurfactants, conjugated linoleic acid (CLA) and peptidoglycans (PG) (Figure 2).

FIGURE 2

3.1 Cell-free supernatants

Cell-free supernatant (CFS) of probiotic strains has driven interest among researchers in finding bioactive molecules targeting various health problems. Generally, CFS is a fluid that consists of nutrients utilized in the growth medium and metabolites released as a result of microbial development (Lee et al., 2022). CFS of probiotics contains low molecular weight compounds like hydrogen peroxide, and organic acids and high molecular weight compounds like bacteriocins (Kapustian et al., 2018). These components are obtained from centrifugation of the grown cultures directly followed by filtration. The composition of CFS may vary with the supplementation in the base culture medium like MRSB (de Man Rogosa, and Sharpe broth). CFS has been explored widely for its anti-microbial, anti-biofilm, anti-inflammatory, and anti-cancer studies. The results obtained through numerous studies report that CFS of probiotic bacteria is one of the promising biotherapeutic agents to treat a wide range of diseases including cancer (Żółkiewicz et al., 2020).

As CFS of probiotic bacteria contains a wide range of metabolites, they are employed in studying many types of cancer. There are several studies carried out with the involvement of CFS of Lactobacillus spp., Bifidobacterium spp., Bacillus spp., Enterococcus spp., Pediococcus spp., Lactiplantibacillus spp., and Saccharomyces spp. using different cancer cell lines and induced animal models against cancers such as colon, breast, gastric, cervical, skin, and lung cancer (Table 2). Results obtained from these in vitro and in vivo studies suggest that CFS bears therapeutic potential in reducing tumor growth and inducing apoptosis. However, the proper mechanism of action of CFS against cancers and further phase trials need to be elucidated.

3.2 Bacteriocins

Bacteriocins are cationic peptide molecules that are produced by all classes of bacteria. These bioactive components are found to be heat-stable, proteases-sensitive, synthesized ribosomally, and have different modes of action (Darbandi et al., 2022). Bacteriocins have been classified into three classes I, II, and III by their structural and physio-chemical properties (Zacharof and Lovitt, 2012). Class I bacteriocins are known as lantibiotics and are small molecular weight peptides ranging from <5 KDa. Apart from lower molecular weight class I are heat stable and contains amino acids like lanthionine, and methyllanthionine. Further classification of class I bacteriocins is based on the charge associated and the mode of action. Class I lantibiotics are classified into two types, Type A lantibiotics (Ex: nisin, positively charged, causes pore formation in cell membrane on the target species) and type B lantibiotics (Ex: Mersacidin, negative charge, interferes in cell wall synthesis of target species) (Kaur and Kaur, 2015). Class II bacteriocins are <10 kDa, heat stable, and are commonly known as non-lanthionine peptides. Further classification of class II bacteriocins is subclass IIa (monomeric), IIb (Contains two segments), and IIc (circular bacteriocins) (Cotter et al., 2005). Class III are the high molecular weight heat liable proteins ranging around >30 kDa like colicins and enterolysin (Kaur and Kaur, 2015).

Several studies have carried out trials on bacteriocins against cancer. Factors that selectively act against cancer cells have been observed in numerous studies however, no proper mechanism of action could be proposed. Cancer cells are characterized by a lack of asymmetry in phospholipid types, and possess a negative charge due to the presence of anionic phosphatidylserine, glycosylated mucins, heparin, and gangliosides (Riedl et al., 2011). Bacteriocins are cationic peptides that can bind to the negatively charged membrane of cancer cells and act against them (Hoskin and Ramamoorthy, 2008). Here we have listed the studies where bacteriocins derived from probiotic bacterial strains were employed against types of cancer (Table 3).

3.3 Exopolysaccharides

Exopolysaccharides are biopolymers that microorganisms synthesize during their growth and metabolism (Welman and Maddox, 2003). Production of EPS can be varied from microorganism based on the monosaccharide composition and with the degree of branching. EPS is classified into homo-polysaccharide (containing the same monosaccharide units like dextran and cellulose) and hetero-polysaccharide with varying monosaccharides (xanthan) (Zhou et al., 2019). Synthesis of EPS is distinctly a strain-specific behavior and relies on several factors like the media composition, pH, and temperature (Behare et al., 2013). EPS is widely used in food industries as a stabilizing, emulsifying, and water-binding agent (Singh and Saini, 2017). The EPS of probiotic bacteria is found to exhibit anti-oxidative, anti-aging, anti-biofilm, and immunomodulatory effects as well as anti-tumor activity at in vitro and in vivo conditions (Di et al., 2017; Wang et al., 2019).

EPS has gained importance in scientific research due to its diverse properties like adherence towards intestinal epithelium and inhibition of pathogenic microbes in the gastrointestinal environment (Jurášková et al., 2022). Apart from anti-microbial, anti-biofilm, and anti-inflammatory, EPS derived from probiotic strains have been evaluated for their anti-cancer activity in various in vitro and in vivo conditions as shown in Table 4.

3.4 Short-chain fatty acids (SCFAs)

SCFAs belong to the metabolite produced by the probiotic bacteria as a result of metabolism and they are aliphatic compounds with 1-6 carbons. The gut microbiome has the potential to generate large amounts of SCFA from the available fermented carbohydrates and non-digestible components present in the gastrointestinal environment (Mirzaei et al., 2021). SCFAs are absorbed by the process of simple diffusion and active transport by transporters present over the membranes of all tissues and cells including the immune cells (Kim et al., 2014). SCFAs that are not taken up by the colonocytes are transported over the basolateral membrane enter the blood circulation and affect other cells directly (den Besten et al., 2013). Lack of SCFA production may lead to the pathogenicity of several diseases like asthma, neurological disease, and cancer (Tan et al., 2014). The most abundant SCFAs are acetate, propionate and butyrate, produced by Clostridium, Propionibacterium, and Lactobacillus species. In recent days, SCFAs have been developed and employed as immunomodulatory therapeutics as it has several advantages compared to the microbe-based methods (Feitelson et al., 2023). SCFAs interplay between the gut and different organs through systemic circulation (Tsvetikova and Koshel, 2020). Mainly SCFA-related effects are associated with two pathways: activation of GPCR (G-protein coupled receptors) and suppression of histone deacetylases (Carretta et al., 2021). SCFA, especially butyrate has been widely studied against cancer as it is believed to be involved in anti-cancer activity by altering cellular responses to the metabolism and oxidative stress (Vrzáčková et al., 2021). Several studies report that SCFA induces apoptosis in cancer cells by disrupting membrane potential, enhancing the expression of GPCR molecules, and mitochondrial depolarization (Table 5).

3.5 Conjugated linoleic acids (CLA)

Probiotics are capable of hydrogenation of long-chain fatty acids. In the process of hydrogenation, the free fatty acid is converted into its conjugate form (Dubey et al., 2012). Probiotic strains belonging to Bifidobacteria and Lactobacillus species are the predominant CLA producers that are widely used in several functional foods (Ghosh and George, 2023). Apart from these main groups of probiotics, species of Propionibacterium, Streptococcus, and Enterococcus present in the intestinal gut flora also produce fewer amounts of CLA (Palla et al., 2021). CLA production was also identified in the Pediococcus strain apart from well-known probiotics strains (Dubey et al., 2012). CLA has been shown to possess numerous health benefits like anti-diabetic, anti-inflammatory, anti-atherogenic, and anti-carcinogenic properties in both in vitro and in vivo studies (Ewaschuk et al., 2006). Scientific evidence depicts that CLA can inhibit the proliferation and growth of cancer cells and induce apoptosis (Table 6).

3.6 Peptidoglycan and other metabolites

Excepting the major postbiotic components, some structural compounds present in the probiotic bacteria also play a vital role in contributing to host health. Peptidoglycan, commonly known as murein is one of the major bacterial cell wall components which maintain the morphology of cells (Dramsi et al., 2008). Some researchers reported that these molecules possess anticancer activity by altering apoptotic gene expressions and inhibiting cell growth (Table 6). However, PG as a postbiotic component may augment inflammation. PG, being a part of PAMP (pathogen-associated molecular pattern)/or DAMP (damage-associated molecular pattern) may induce components of host-PRR (pattern recognition receptors), mainly via TLR-2, TLR-4 (toll-like recptors) to induce inflammation by innate immune cells, macrophages, neutrophils, dendritic cells to sustain inflammation at the local tissue microenvironments which may cause host-tissue damages. It may induce, and activate immune cells to release of proinflammatory cytokines like IL-1β, IL- 6, IL-8, and TNF α. Thus, it bears immunological limitations in its use for benefitting host health. Considering the wide range of applications of extracellular vesicles (EV), EVs from probiotic bacteria were employed against cancer cell lines. EVs are membrane-bound components that are spherical, consist of a lipid bilayer, and transfer genetic materials through the process of horizontal gene transfer (Ghosh, 2024; Ahmadi Badi et al., 2017). EVs contain proteins, DNA, RNA, glycolipids, polysaccharides, enzymes, and some endotoxins (Chelakkot et al., 2018). EVs were found to block the cell cycle and suppress cell proliferation (Table 7).

Apart from above mentioned bioactive postbiotics components, heat-killed (HK) probiotic cells have created experimental data in the field of medicine. HK cells exist in inactive form achieved by incomplete autoclaving and by cell freezing technique (Taverniti and Guglielmetti, 2011). These heat-killed cells showcased competency for adhesion sites against pathogens in a Caco-2 cell line model (Singh and Saini, 2017). Additionally, several findings validate that heat-killed cells have the potential to modulate host health and as a competing anti-cancer agent (Table 7)

4 Mechanism of action of postbiotics against cancer

4.1 CFS - Mechanism of action

CFS is a result of simple preparation by cultivating live probiotics in media, centrifugation, and filter sterilization which exhibits multiple probiotic characteristics. Study with CFSs of probiotics (Bifidobacterium adolescentis SPM0212, Lactobacillus rhamnosus GG, Lactobacillus delbrueckii, Bacillus polyfermenticus KU3, Lactobacillus fermentum NCIMB5221, Lactobacillus reuteri NCIMB 701359; Lactobacillus pentosus B281, Lactoplantibacillus plantarum B282; Lactobacillus casei (SR1,SR2), Lactobacillus paracasei (SR4); Lactobacillus salivarius and many other strains) using different cancer cell lines (e.g., Caco-2, HCT-116, HT-29, HeLa, LoVo, SW480, SW620, AGS, and MCF-7, CRL-1831and other cell lines related to respective cancer) demonstrated pathophysiological, cell biological and immunological impact to abrogate the cancer progression, metastasis by induction of apoptosis and inhibition of cancer cell proliferation; downregulation of cyclin D1 (cell cycle arrest in G1-phase), cyclooxygenase-2, protein kinase B and NF- κB activation; downregulation of Bcl-2 gene, cleavage of caspase-9, caspase-3, and PARP; downregulation of MMP2, MMP9, and suppression of the VEGF pathway; and upregulation of BAX, BAD genes (Table 2). CFAs of probiotic strains demonstrate a complete anti-cancer interaction with studied cell lines. Similarly, results obtained from animal studies using the C57BL/6 mouse (Liu et al., 2021), and MCF-7 xenograft mouse (Behzadi et al., 2021) model reveal that probiotic CFSs have the demonstrable potential for inhibition of cell proliferation and reduction in weight of tumor; and inhibition of epithelial-mesenchymal transition (EMT) by regulating Wnt/β-catenin pathway.

4.2 Bacteriocins - Mechanism of action

Bacteriocins were identified to induce apoptosis in cancer cells through cancer signaling pathways. As bacteriocins possess a cationic, amphiphilic, and hydrophobic nature, they target tumor cells resulting in apoptosis (Wang et al., 2024). Nisin, the class I lantibiotics, induced apoptosis in cancer cells by regulating the intrinsic pathway, intervened by mitochondria. Also, BCL-2 (B-cell lymphoma 2) family proteins such as Bcl-2 and BAX gene expression were altered in colon cancer cell lines (Ahmadi Badi et al., 2017). Normally, Bcl-2 protein expression is observed to be higher in cancer cells compared to that of normal cells. Apart from that, Bcl-2 family proteins act as an obstacle to apoptosis, develop resistance to the therapy, and in tumor development (Campbell and Tait, 2018). Generally, cancer cells are found to be resistant to apoptosis, on that note a study reported that, mechanisms that induce apoptosis begin with the release of cytochrome c (Cyt c) from the mitochondria and persuade ER to produce calcium. Both of these molecules play a vital role in apoptosome formation, activating cell surface death receptors and initiating caspase-dependent pathways (Joo et al., 2012). Cyt c mainly functions as an electron carrier during the mitochondrial respiratory chain, interacts with Apaf-1 (apoptotic protease activating factor-1) that exists in the cytosol, and enables it to form apoptosomes leading to activation of caspase-9 and caspase-3 that implements programmed cell death (Figure 3A) (Elena-Real et al., 2018). In another study, nisin treatment in human colon cancer cell lines showcased the altered expression of CEA (Carcinoembryonic antigen) and matrix metalloproteinase (MMP) genes (Norouzi et al., 2018). These MMPs are found to be potential modulators in the development of cancer, which can directly involve cancer signaling pathways and control apoptosis (Kessenbrock et al., 2015).

FIGURE 3

Some of the studies pointed out that enterocin resulted in cell cycle arrest on human cancer cell lines (Anakiah et al., 2017; Al-Fakharany et al., 2018; Al-Madboly et al., 2020). Cell cycle arrest is considered the emerging approach against cancer, as this mechanism supports tumor cells to restore their damaged DNA. Thus, negating cell cycle checkpoints before the DNA repair mechanism can lead to the activation of apoptotic cascade pathways that result in cell death would be a promising approach in cancer therapy (Schwartz et al., 2005).

4.3 Exopolysaccharides - Mechanism of action

Exopolysaccharides comprise proteins, extracellular DNA, lipids, and a major number of polysaccharides which enables them a wide range of health-benefiting properties (Di Martino, 2018). Several studies report that probiotic exopolysaccharides inhibit cancer cells without affecting normal cells, compared to synthetic drugs. There are various possible mechanisms of EPS to act upon cancer cells like induction of apoptosis, prevention of cell proliferation, and improvement of the host immune system (Angelin and Kavitha, 2020). Apoptosis is associated with two major caspase-dependent pathways known as intrinsic and extrinsic pathways. The differences in these two depend on the genes and proteins that are involved in driving the pathway. In intrinsic pathways, caspase-3, caspase-9, BAX, and, BCl-2 genes are expressed, whereas the extrinsic pathway involves caspase-8 and caspase-10 expression (Jan and Chaudhry, 2019). Activation of caspase-3 is a sign indicating that the cancer cells have undergone cell shrinkage, chromatin condensation, and nuclear fragmentation effectively (Jung et al., 2001). Previously it was found that EPS from L. gasseri was able to inhibit the proliferation of HeLa cells by upregulation of BAX and caspase three gene expression which leads to activation of apoptosis (Sungur et al., 2017). EPS derived from L. plantarum NCU116 witnessed an increase in the expression of pro-apoptotic genes like Fas, FasL, and c-Jun along with TLR-2 in mouse intestinal cells (Figure 3B) (Zhou et al., 2017). These Fas genes known as the first apoptosis signal along with its receptor mainly trigger the extrinsic pathway of apoptosis that is responsible for the suppression of tumors, so upregulation of the genes can induce apoptosis (Peter et al., 2015). EPS of L. delbrueckii ssp. Bulgaris exhibited upregulation of the p53 gene along with other caspase genes that are involved in inducing apoptosis (Khalil et al., 2022). p53 acts as a tumor suppressor gene, involved in inducing cell cycle arrest and a nuclear transcription factor possessing pro-apoptotic function. This gene is also found in high levels in patients suffering from cancer with mutant types of p53 (Ozaki and Nakagawara, 2011). Hence due to their disparate mechanisms listed in Table 3 in treating cancer cells, these can be employed in the treatment of cancer with evidence of phase trials.

4.4 Conjugated linoleic acid – mechanism of action

Even though CLA has been well known for its wide range of applications, there are fewer studies involving CLA derived from probiotics against cancer. A study found that CLA extracted from L. plantarum exhibited anti-cancer activity in mammalian breast cancer cell lines by suppressing the NF- κB pathway and then by upregulation of the BAX gene leading to an apoptotic pathway (Kadirareddy et al., 2016). Apart from this, CLA produced by P. pentosaceus GS4 possesses anti-cancer activity in colon cancer cell line (HCT-116) by downregulation of NF- κB and inducing apoptosis (Dubey et al., 2016). This NF- κB pathway is mainly involved in the development and progression of tumors, cellular immunity, inflammation, and regulation of cell differentiation. NF- κB promotes the expression of genes of the Bcl-2 family, caspase-8 inhibitor proteins, and other apoptosis-inhibiting proteins which primarily function by preventing apoptosis of a cell (Figure 4A) (Xia et al., 2018). Moreover, the NF- κB signaling pathway was identified as contributing to metastasis and also preventing the process of epithelial-to-mesenchymal transition (EMT) (Hoesel and Schmid, 2013).

FIGURE 4

Apart from these pathways, genes like COX-2 and LOX are identified and reported that they induce metastasis as well as cancer-supporting mechanisms. COX-2 gene is produced by fibroblasts that are associated with cancer and also by type 2 macrophage cells, which mainly promotes proliferation, apoptotic resistance, invasion, and metastasis in cancer cells (Hashemi Goradel et al., 2019). Along with the COX-2 gene, the LOX gene plays a vital role in inflating cancer cell proliferation, angiogenesis, and metastasis. CLA from P. pentosaceus GS4 has been reported to downregulate both the COX-2 and 5-LOX gene expression in the colon cancer cell line (HCT-116) (Figure 4C). Also, the upregulation of PPAR γ, a nuclear receptor that acts as a regulator of cell metabolism and functions as an inhibitor of cancer cell growth. PPAR γ causes oxidative stress and the flow of electrons that promote apoptotic cascades and some effects on mitochondria-mediated cell metabolism (Figure 4B). (Ghosh and George, 2023). CLA that is produced by the P. pentosaceus GS4 possesses biohydrogenation ability which modulates cancer by modulation of PPAR γ concerning anti-proliferative ability (Dubey et al., 2023).

4.5 Short-chain fatty acids – mechanism of action

SCFAs that are produced from probiotics possess anti-proliferative, apoptotic, and cell cycle arrest properties over cancer cells as well as contribute to prohibiting carcinogenesis in the gut (Tripathy et al., 2021). Harnessing SCFAs against cancer can pave the way to getting rid of the crisis because of its impact on the expression of multiple genes and their related pathways that are relevant to cancer. It is found that GPR43 suppresses tumor growth by modifying the gut flora (Kong et al., 2022). SCFAs also function as ligands for G-protein coupled receptors (GPCR). There are receptors like GPR43 which specifically have a higher affinity for propionate and GPR109a for butyrate (Feitelson et al., 2023). SCFAs are found to upregulate the expression of β-catenin and regulate Wnt which may promote the differentiation of cancer cells as well as induce intestinal homeostasis (Jiang et al., 2019). Some studies suggest that these molecules can interfere with cancer pathogenesis before tumor formation by regulating Wnt and inhibiting proliferation (Feitelson et al., 2023). Butyrate from Clostridium butyricum was found to suppress the development of tumors by interfering with the Wnt/β catenin pathway and also by increasing the gene expression of GPR43 and GPR109A (Figure 5A). (Chen et al., 2020). Similarly, butyrate from Butyricicoccus pullicaecorum employed against urinary bladder cancer upregulated the expression of GPR43 resulting in the mitigation of cancer (Wang et al., 2021). Butyrate from L. plantarum S2T10D was found to suppress the expression of the cyclin D1 gene and also arrest the cell cycle at the G2/M phase (Figure 5B). (Botta et al., 2022). Cyclin D1 is one of the key regulators that performs a central role in the pathogenicity of cancer determining the cell proliferation and overexpressed in cases of cancer, whereas they are properly regulated in normal cells. Targeting this cyclin D1 could be a promising strategy to prevent tumor development (Montalto and De Amicis, 2020).

FIGURE 5

5 Future directions and conclusion

Cancer treatment in the modern era involves a dual approach based on the type of cancer and its associated characteristics like progression, area of localization, and metastasis (Ghosh and George 2023). Along with chemotherapy, other treatments are being developed with higher effectiveness and minimizing side effects to the host (Mármol et al., 2017). Probiotics and postbiotics have showcased their efficacy against various diseases and cancers with their role in vital processes like apoptosis induction, downregulation of tumor-inducing genes, suppression of cell proliferation, and prevention of metastasis (Sankarapandian et al., 2022). Growing shreds of evidence state that a combination of probiotics and postbiotics can be practiced as an adjuvant for patients undergoing chemotherapy (Lu et al., 2021). Significant research is in progress for employing probiotics and their bioactive metabolites (postbiotics) against cancer. Despite the wide usage of probiotics in treating different diseases, some side effects are caused in a small proportion of the population due to their uptake. In 2002, WHO-FAO released a report (http://www.fda.gov/ohrms/dockets/dockets/95s0316/95s-0316-rpt0282-tab-03-ref-19-joint-faowho-vol219.pdf) stating that “probiotics may be responsible for mainly four types of side effects” including systemic infections, deleterious metabolic activities, excessive immune stimulation in susceptible individuals, and gene transfer. Apart from these major effects, minor gastrointestinal symptoms like diarrhea, and other digestive problems are also reported after the uptake (Doron and Snydman, 2015). Probiotics have been reported to induce bacteremia, fungemia, localized infection, liver abscess, and endocarditis (Liu et al., 2024). Rather than live cells, these postbiotic components have created a cornerstone among researchers all over the globe due to their broad range of applications. In that case, bioactive compounds with anticancer properties, such as bacteriocins, EPS, SCFAs, and CLAs can be utilized as anticancer agents (Liu et al., 2021). Probiotics have been reported to induce bacteremia, fungemia, localized infection, liver abscess, and endocarditis (Liu et al., 2024). Rather than live cells, these postbiotic components have created a cornerstone among researchers all over the globe due to their broad range of applications. In that case, bioactive compounds with anticancer properties, such as bacteriocins, EPS, SCFAs, and CLAs can be utilized as anticancer agents (Liu et al., 2021). Despite their numerous properties, they possess some limitations like decreased bioavailability, and susceptibility against proteolytic enzymes in the GIT when they are orally administered. To overcome this lag, various strategies like encapsulation technology involving semi-synthetic techniques can improve their biological activity, stability, and also physiochemical activities (Xu et al., 2024). Even though there are numerous research articles, review articles, and products based on probiotics, there is countable proper evidence with clinical studies provided for the usage of probiotics with or without postbiotics for cancer prevention.

The present review highlights the involvement of postbiotic components from the potential probiotic strains employed against various types of cancer in both in vitro and in vivo studies along with their reported mechanism of action. From the above-reported studies, it is evident that different postbiotic components can be introduced in treating cancer as adjuvants that aid in decreasing the side effects caused by regular treatments. The rising trends of outcomes from the research are growing significantly with well-grounded data before recommending probiotics and postbiotics as alternative therapies for treating and preventing various forms of cancer. However, extensive research is needed to explore the anticancer efficacy of the specific or combined postbiotic-bioactive components as an alternative treatment strategy for preventing and controlling cancers.

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