Health Effects of Metabolites from Probiotic Bacteria

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1		Victor Enrique Vera-Santander	--	3529	2023-05-09 17:18:03	\|
2	Format correct	Wendy Huang	-1554 word(s)	1975	2023-05-11 11:22:53	\|

This entry is adapted from the peer-reviewed paper 10.3390/molecules28031230

Probiotics have been extensively studied within the medical, pharmaceutical, and food fields, as it has been revealed that these microorganisms can provide health benefits from their consumption. Bacterial probiotics comprise species derived from lactic acid bacteria (LAB) (genus Lactobacillus, Leuconostoc, and Streptococcus), the genus Bifidobacterium, and strains of Bacillus and Escherichia coli, among others. The growth of bacterial probiotics is involved in fermentation, which metabolizes the nutrients of the medium and produces a wide variety of metabolic compounds. Probiotics are defined as microorganisms that, when consumed in adequate doses or concentrations, can benefit the consumer’s health.

probiotic bacteria metabolites health effects

1. Introduction

The growth of bacterial probiotics is involved in fermentation, which metabolizes the nutrients of the medium and produces a wide variety of metabolic compounds. Metabolites from bacterial probiotics have been studied as they may be the main cause of positive effects on consumer health ^[1]. Most bacterial probiotics belong to the LAB group, which primarily synthesizes lactic acid from carbohydrate fermentation ^[2]. Bacterial probiotics excrete secondary metabolites such as organic acids, short-chain fatty acids, enzymes, peptides, teichoic acids, peptidoglycans, exopolysaccharides (EPSs), vitamins, plasmalogens, neurotransmitters, biosurfactants, amino acids, and flavonoid-derived compounds such as desaminotyrosine, equol daidzein, noratirriol, terpenoids, and phenolic compounds, among others ^[3]^[4]. Figure 1 shows a diagram of the health effects that have been studied concerning bacterial probiotic metabolites. Various components have been investigated, including short-chain fatty acids (SCFAs), bacteriocins, enzymes, teichoic acids, EPSs, vitamins, plasmalogens, and biosurfactants.

Figure 1. Diagram of health benefits of metabolic compounds of probiotic bacteria.

2. Short-Chain Fatty Acids

SCFAs are the main metabolites produced by the fermentation of intestinal bacteria; these compounds are produced from the fermentation of non-digestible carbohydrates (prebiotics) by the intestinal microbiota ^[5]. The SCFAs primarily produced are acetate, propionate, and butyrate. The metabolic pathways of acetate are very diverse and depend on the type of bacteria, while the synthesis of propionate and butyrate depends on a specific substrate ^[6]. Gill et al. ^[7] determined that homo-fermentative bacteria synthesize SCFAs from carbohydrate fermentation to produce pyruvate via glycolytic, while heterofermentative bacteria, such as bifidobacterial, do so through the phosphoketolase pathway.

The bacterial probiotics that have been studied are mainly of the genus Lactobacillus and Bifidobacterium. For example, one study investigated the production of SCFA from Bif. longum SP 07/3, Bif. bifidum MF 20/5, L. gasseri PA, 16/8, and L. rhamnosus GG ^[8]. In the results, the highest production of acetate and propionate was with Bif. bifidum, with a concentration of approximately 125 mM and 130 μM, respectively, while L. rhamnosus GG presented the lowest production of SCFA, with 55 mM of acetate and 100 μM of propionate. SCFAs activate G-specific protein-coupled receptors (GPRs), where GPR41 (known as free fatty acid receptor 3) and GPR43 (free fatty acid receptor 2) have been related to a wide health effect of antitumor and anti-inflammatory benefits on the colon, protection against the development of immune disorders, obesity control, glucose homeostasis control, appetite regulation, and cardiovascular effects ^[3]^[7]^[9]. Gill et al. ^[7] suggested the consumption of SCFA through the diet as a postbiotic effect, since it has been reported that vinegar and kombucha are the foods with the highest levels of SCFA, with 1015.82 mg of acetate per tablespoon (15 mL) and 1222.95 mg of acetate in a portion of 330 mL, respectively.

In comparison, some cheeses, such as Swiss cheese and blue vein cheese, are high in propionate (109.14 mg) and butyrate (136.54 mg) in a serving of 25 g, respectively ^[10]. A minimum dose of consumption of SCFAs has not been determined for functional health effects. However, an intervention study tested a beverage with apple cider vinegar containing 25.8 mM of acetate, 0.05 mM of propionate, and 0.04 mM of butyrate. The beverage helped reduce blood pressure, showing potential cardiovascular effects ^[10]. However, the doses of these compounds and how they can be supplied through food remain to be investigated more thoroughly.

3. Plasmalogens

According to Řezanka et al. ^[11], plasmalogens are lipid compounds with important functions in organisms such as bacteria, protozoa, invertebrates, and mammals. The largest classes of plasmalogens are glycerophosphoryl ethanolamine and glycerophosphorylcholine with a vinyl ether in the position of glycerol sn-1 instead of a fatty acid. At the position of glycerol sn-2, plasmalogens are enriched with a polyunsaturated fatty acid ^[12]. Regarding bacterial probiotics, only the production of these compounds with Bif. animalis subsp. lactis has been investigated. This research was conducted by Oberg et al. ^[13], in which plasmalogens were recognized as endogenous antioxidants induced by hydrogen peroxide (H₂O₂). The effects caused by these compounds are positively involved in neuro-regeneration and the alleviation of heart disease; it has positive effects against type 2 diabetes, obesity, inflammation, and cancer ^[12].

Regarding neuro-regeneration, plasmalogens are the main components of neuronal tissue, contributing between 50% and 80% of the total glycerophosphoryl ethanolamines of the gray and white matter of the brain ^[14]. As proof of this claim, Hossain et al. ^[15] observed that a daily intake of plasmalogens could improve cognition in Alzheimer’s patients. However, research into these metabolites is still very early, and more research is needed concerning their production in bacterial probiotics and their potential health benefits.

4. Enzymes

Enzymes excreted by microorganisms have a variety of biochemical, physiological, and regulatory functions. As shown in Figure 1, the health benefits of proteases are the protection of cells from oxidative stress and effects against heart disease and cancer ^[5]. Microorganisms of the genus Bacillus are probably the most important bacterial source of proteases, as they are capable of producing high amounts of neutral and alkaline proteolytic enzymes with remarkable properties, such as high stability at extreme temperatures, pH, organic solvents, detergents, and oxidizing compounds ^[16]. The proteases (subtilisin and glutamyl endopeptidase) of B. pumilus have been shown to degrade polymeric extracellular components and significantly eradicate the biofilm generated by Serratia marcescens, known as an opportunistic pathogen responsible for several hospital-acquired infections ^[17]. Although enzymes have been widely studied in science, more research is still needed regarding their effects in the human body.

5. Bacteriocins

Bacteriocins are polypeptides and proteins that form pores in bacterial membranes and inhibit cell wall synthesis ^[3]. Currently, there are five classes of bacteriocins, as follows:

Class I: Small proteolytic and heat-resistant peptides substantially modified by transcriptionally specific enzymes. Examples: lantibiotics (nisin), sactipeptide, and loop peptides ^[18].
Class II: Divided into four subtypes that are (1) pediocin-like, (2) two peptides, (3) circular, and (4) linear, not pediocin-like. They comprise small peptides resistant to temperature and pH ^[18].
Class III: Large thermolabile peptides (>30 kDa) with complex activity and structure. This group includes helveticin, acidophylline, and lactacins (A and B) ^[19].
Class IV: It consists of complex proteins conjugated with lipids or carbohydrates. Examples include lactocin S (glycoprotein) and mesenterocin (lipoprotein) ^[18]^[19].
Class V: Peptides with circular structures without post-translational modifications, including enterokine AS-48 and gasericin A ^[19].

Nisin is one of the most studied and used bacteriocins in food science and industry. This bacteriocin is produced by Lactococcus. lactis subsp. lactis and is approved by the FDA as a Generally Recognized as Safe Additive (“GRAS”) ^[20]. The antimicrobial spectrum of nisin is broad and can inhibit the growth of Staphylococcus aureus, Cutibacterium acnes, Mycobacterium smegmatis, and strains of Bacillus, Clostridium, Enterococcus, Mycobacterium, and Streptococcus ^[21]. Furthermore, bacteriocins from Enterococcus faecalis and L. casei have been shown to be effective against urogenital, intestinal, and antibiotic-resistant pathogens ^[22]^[23].

6. Exopolysaccharides (EPSs)

EPSs are biopolymers produced by microorganisms during their growth. They vary according to the degree of branching from linear to highly branched molecules ^[24]. EPSs are divided into homopolysaccharides and heteropolysaccharides. Homopolysaccharides are composed of monosaccharides identical in their structure; for example, starch and cellulose. In comparison, heteropolysaccharides consist of different monosaccharides such as xanthan gum, pectin, and galactomannans, among others ^[25]. The probiotics that have been studied reagrding EPSs belong to the genus Lactobacillus. In a study by Xu et al. ^[26], they presented that EPSs produced by L. buchneri TCP016 (doses of 200–800 mg) were able to reduce liver damage by regulating the intestinal microbiota, since EPSs reduced the growth of Helicobacteraceae, Lachnospiraceae, and Enterobacteriaceae, but increased the proliferation of Lactobacillus, Rikenellaceae, Bacteroidaceae, and Prevotellaceae. In another study, Wang et al. ^[27] studied the EPS from L. fermentum S1 by applying doses of 1–4 mg/mL; these EPS showed potent antioxidant activities and prevented the formation of biofilms of E. coli and S. aureus. In addition, EPS from L. casei SB27 showed an increase in the concentration of these compounds (600 μg/mL), and antitumor effects in vitro were increased ^[28]. EPSs have demonstrated various health effects such as antioxidants, cholesterol-lowering effects, immunity, anti-aging, modulation of the intestinal microbiota, and antitumor ^[26]^[27]^[28]^[29].

7. Teichoic Acids

According to Van der Es et al. ^[30], teichoic acids are composed of anionic glycopolymers (ribitol) with repeated units of polyols attached to phodiester. There are two types of teichoic acids: Lipoteichoic Acids (LTAs), which are anchored to the membrane by a glycolipid, and Wall Teichoic Acids (WTAs), which are covalently bound to peptidoglycan ^[31]. Teichoic acids have important roles in bacteria, such as determining cell shape, regulating cell division, and providing vital metabolic aspects for cell physiology, and may confer pathogenesis and antibiotic resistance of Gram-positive bacteria ^[3]. The most studied teichoic acids in science are LTAs, due to their immune, antitumor, and antioxidant functional properties ^[32]. For example, several studies have shown that LTAs from L. delbrueckii, L. sakei, L. rhamnosus GG, and L. plantarum K8 have potential anti-inflammatory effects ^[33]^[34]^[35]. Wang et al. ^[36] studied the LTAs of L. paracasei D3–5 using a dose of 200 mg /kg per day. Their results showed that the compounds benefited the physical, cognitive, and anti-inflammatory functions in mice.

8. Vitamins

Vitamins are essential in the diet in small amounts to facilitate various body biological processes. LeBlanc et al. ^[37] noted that these compounds are important in regulating biochemical reactions in the cell, since some participate as precursors of intracellular coenzymes. Currently, thirteen vitamins are known as essential to human health, and these are classified as fat-soluble (vitamins A, D, E, and K) and water-soluble (vitamin C and vitamins of the B complex) ^[37]. The human body cannot synthesize most vitamins; therefore, consuming them externally through food is an excellent alternative. Bacterial probiotics can synthesize a large amount of vitamins, such as vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B9 (folate), vitamin B12 (cobalamin), and vitamin K ^[3]^[5]. As can be seen, the B complex vitamins are the most produced by bacterial probiotics; production is important, since the B vitamins act in synergy in the body’s homeostasis by participating in metabolic processes, such as energy generation and the synthesis of red blood cells ^[37]. Deptula et al. ^[38] noted that vitamin B12 produced through microbial fermentation is preferable to chemical synthesis. Nataraj et al. ^[3] argued that using microorganisms in vitamin production is more economically feasible than fortifying with chemically synthesized pseudo-vitamins. Bacterial probiotics such as L. brevis, L. fermentum, L. reuteri, and L. salivarius have complete genes (ribA, ribB, ribG, and ribH) for riboflavin synthesis ^[39]. Bardosono et al. ^[40] conducted a clinical trial consisting of Bif. animalis subsp. lactis HNO19 supplementation in pregnant women. Their results showed that probiotic supplementation increased the concentration of vitamin B6 in the blood and vitamin B12 in the second and third trimesters, respectively. Therefore, consuming probiotics or foods with probiotics is vital to staying healthy, as vitamins can also be synthesized in the digestive tract.

9. Biosurfactants

Biosurfactants represent a wide diversity of polymers synthesized during the early and late logarithmic stationary phases of a microorganism’s growth cycle ^[41]. Biosurfactants consist of glycolipids, lipopeptides, phospholipids, neutral lipids, protein-polysaccharide complexes, and free fatty acids ^[3]. The species of Lactobacillus are the most studied concerning biosurfactants. The biosurfactants (methylpentadecanoic acid and eicosanoic acid) of L. jensenii P6A and L. gasseri P6 have shown antimicrobial properties against several pathogens, such as E. coli, Candida albicans, Staphylococcus saprophyticus, Enterobacter aerogenes, and Klebsiella pneumonia ^[42]. Merghni et al. ^[43] showed that the biosurfactants of L. casei ATCC 393 have antioxidant and antimicrobial properties against S. aureus (present in the oral cavity), suggesting that biosurfactants could have a significant role in the prevention of oral diseases. Fracchia et al. ^[44] noted that biosurfactants exhibit a wide variety of properties such as emulsion stabilization, anti-adhesion capacity, anti-biofilm, anticancer, antiviral, immunological, and antimicrobial.

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Victor E. Vera-Santander

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