Butyric acid is a vital fatty acid produced when the good bacteria in the gut break down dietary fibre. It is naturally found in animal fats and vegetable oils, however, the quantity of butyric acid found in food sources is less compared to the amount produced in the gut.
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What is Butyric Acid?
Butyric acid is known as a short-chain fatty acid (SCFA), which is one among the three most common SCFA&#;s in the gut, along with acetic acid and propionic acid. These saturated fatty acids comprise about 90-95 % of the SCFAs in the gut that is produced when gut-friendly bacteria break down dietary fibre. Butyric acid is well-known to support digestive health, reduce inflammation and lowers the risk of diseases and promote overall health. It holds a significant role in providing colon cells with the needed energy to carry out its normal functions and also regulates blood sugar and cholesterol levels. It goes by other names such as butyrate and butanoic acid.
Incredible Health Benefits Of Butyric Acids
Fuels Gut
Butyric acid serves as a chief source of energy for colon cells, which make up the lining of the intestine. While most of the body cells utilise glucose as the main source of energy, the colon cells lining gut chiefly use butyrate, without butyrate these cells are unable to perform normal functions. The short-chain fatty acids offer an oxygen-free environment that supports the growth of gut microbes that controls inflammation and maintain gut cells healthy.
Also Read: Prebiotics: 5 Awesome Foods That Uphold Gut Health-Infographic
Potent Antioxidant Effects
Butyrate guards the cells against detrimental substances to keep gut healthy and disease-free. A colon is a storage place of the waster products. Higher levels of butyrate have shown to increase levels of glutathione, an antioxidants made in the system which neutralises free radicals in the gut. This improves the barrier function of the colonocytes and lowers the risk of bowel cancer, inflammatory bowel disease (IBD), and irritable bowel syndrome (IBS).
Prevents Cancer
Regular intake of high fibre diet increases the amount of butyric acid produced in the gut which is well-known to reduce the risk of colon cancer. Studies have proven that butyric acid is a potential to prevent and treat colon cancer by blocking the growth of colorectal tumour cells. Moreover, it also leads to apoptosis that stops the growth of cancer cells completely.
Manages Diabetes
Studies show that butyrate stimulates the secretion of gut hormones such as glucagon &#;like-peptide -1(GLP-1) and peptide YY (PYY).GLP-1 hormones increase insulin secretion and lower the production of glucagon in the pancreas. While the PYY hormones promote the uptake of glucose in muscles and fatty tissue. Thus the presence of butyric acid increases the secretion of gut hormones that regulate type 2 diabetes and control weight
Boosts Brain Health
Butyric acid plays a key role in promoting neuroprotective effects that trigger brain and nervous system function. Butyrate targets several pathways linked with the progression of neurodegenerative diseases like Parkinson&#;s, Alzheimer&#;s stroke and autism. A diet abundant in butyric acid is an effective way to improve disease outcomes and uplift overall health.
Food Sources Rich In Butyric Acid
Generally, most of the butyric acid in the body is made from the gut bacteria. While some amount of butyric acid is also found naturally in food sources which include:
Ghee
Cow&#;s milk
Butter
Sheep&#;s milk
Breast milk
Parmesan cheese
Red meat
Vegetable oils
Sauerkraut
Butter is one of the richest sources of butyric acid. It is also available in the form of dietary supplement as sodium butyrate. However, increasing the intake of dietary fibre can also help to boost butyric acid level in the gut. The gut bacteria chiefly feed on resistant starches which the body can&#;t break down. Some of the good sources of resistant starches, pectin found in many fruits and inulin.
Also Read: Dietary Fibre And Its Role In Preventing Chronic Diseases
Garlic
Onions
Asparagus
Potatoes
Bananas
Apples
Apricots
Carrots
Oat bran
Conclusion:
Butyric acid is one of the most beneficial short-chain fatty acids that play a key role in uplifting digestive health, reduces inflammation, protects the brain, manages weight and prevent cancer. The gut bacteria in the body make butyrate from the foods you can&#;t digest, which renders the body with a host of health benefits. Enriching your diet with fibre will help to elevate the butyric acid production by the gut flora.
Disclaimer:
Butyric acid is one of the most beneficial short-chain fatty acids that play a key role in uplifting digestive health, reduces inflammation, protects the brain, manages weight and prevent cancer. The gut bacteria in the body make butyrate from the foods you can&#;t digest, which renders the body with a host of health benefits. Enriching your diet with fibre will help to elevate the butyric acid production by the gut flora.
The content provided here is for informational purposes only. This blog is not intended to substitute for medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider for any questions or concerns you may have regarding a medical condition. Reliance does not endorse or recommend any specific tests, physicians, procedures, opinions, or other information mentioned on the blog.
Abstract
The properties of butyric acid, and the role it plays in the gastrointestinal tract, have been known for many years. However, the newest research shows that butyric acid still remains a molecule with a potential that has not as yet been fully exploited. The article provides an outline of relevant up-to-date knowledge about butyric acid, and presents the expert position on the clinical benefits of using butyric acid products in the therapy of gastrointestinal diseases.
Keywords: butyric acid, irritable bowel syndrome, inflammatory bowel disease, constipation, diarrhea
Introduction
The properties of butyric acid, and the role it plays in the gastrointestinal tract, have been known for a long time now. However, butyric acid is still subject to intensive research which shows that it is a factor in the pathogenesis of gastrointestinal diseases, and has a range of previously unknown properties and potential therapeutic applications. Butyric acid remains a molecule with a potential that has not as yet been fully elucidated and realized.
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The article provides an outline of relevant up-to-date knowledge about butyric acid, and presents the position of gastroenterology and surgery experts on the clinical benefits of using butyric acid products in the therapy of patients with gastrointestinal diseases. Since the article is a follow-up to the study published in [1], a number of issues already addressed in detail in the previous publication are left out, including the formation and roles of butyric acid in the gastrointestinal tract, problems associated with its deficiency, clinical indications and basic use recommendations.
Immunomodulatory activity of butyric acid in the gastrointestinal tract
Research conducted in recent years provides evidence for the long postulated mechanism of action of butyric acid, i.e. its effect on the gastrointestinal immune system. In studies on mice, Furusawa et al. [2] showed that the concentration of butyric acid on the colonic wall stimulates the differentiation of Treg lymphocytes, reducing the severity of inflammation induced by the transfer of TCD4+ CD45RBhi lymphocytes into Rag1&#;/&#; mice. Furthermore, in an in vitro study on undifferentiated T cells incubated with butyric acid, the authors demonstrated an increased acetylation of histone H3, which points to a possible mechanism by which butyric acid (produced by bacteria residing in the gastrointestinal tract) affects the differentiation and specialization of Treg lymphocytes. These very interesting studies have shed new light on the relationship between the host and the gut microflora, and its impact on immune homeostasis in the gut.
Gut-associated lymphoid tissue (GALT) and enterocytes (intestinal epithelial cells &#; IECs) act as the first barrier of defence against bacterial invasion through the secretion of mucins and/or defensins (antibacterial peptides) or the detection of pathogens by Toll-like receptors (TLRs). In addition, specialized IECs are capable of transporting bacterial antigens and presenting them to the immune cells in the lamina propria of the gut wall. The system becomes disturbed, for example, in the elderly, as the relationships and proportions between bacterial groups forming the microbiome are thrown off balance [3]. Similar unfavourable alterations in the microbiome composition are observed in inflammatory bowel diseases (IBD) or in irritable bowel syndrome (IBS), which is described in subsequent sections below. For many years butyric acid has been postulated to play a role of a primary messenger between commensal bacteria and the human immune system. In this understanding, the presence of butyric acid at an appropriate physiological concentration in the colonic lumen is interpreted by the body as information that the bacterial equilibrium is not disturbed, which reduces immune response and tolerance to thousands of antigens representing commensal bacteria and, hence, prevents the initiation of the inflammatory process [4].
Role of butyric acid in irritable bowel syndrome
Symptoms associated with gastrointestinal dysfunction, such as IBS, are estimated to occur in 10&#;30% of the population. The main signs of the disorder include abdominal pain, diarrhoea and altered conditions in the colon. Patients are typically advised to adopt dietary and lifestyle modifications, and are referred for psychotherapy. Pharmacological management includes antibiotics which act topically in the gastrointestinal lumen (rifaxamin) and, additionally, probiotics and in some cases antidepressants.
In one study, the microbiomes of 113 patients with IBS and 66 control subjects were analyzed. A statistically significant decrease in the amount of butyric acid-producing bacteria was found in the group of patients with IBS, particularly with IBS-D and IBS-M (p = 0.002). Also, there was a statistically significant reduction in the level of methane-producing bacteria (Methanobacteria) (p = 0.005), which increases local oxygen reservoirs and probably contributes to an increased incidence of flatulence in this patient group [5].
Considering the above, a compound which offers a high chance for success in the therapy of dysfunctional bowel disorders is sodium butyrate. In Tarnowski et al. [6] assessed the effect of sodium butyrate on selected clinical parameters in patients with irritable bowel syndrome during a 6-week follow-up. The patients were divided into two groups: control group (29 patients) receiving standard treatment with trimebutine and mebeverine (depending on the characteristics of the disease) throughout the entire follow-up period, and study group receiving sodium butyrate at 300 mg daily as an add-on to standard therapy. At baseline and 6 weeks into the study, a questionnaire was completed to assess the symptoms of the disease (on a scale from 0 to 5) and the quality of life IBS-QoL (on a scale from 0 to 100). At the time of inclusion in the study, there were no differences between the patient groups in the severity of discomfort and pain, bowel movement disorders, severity of flatulence and other gastrointestinal and IBS-associated symptoms. After 6 weeks, a statistically significant improvement was observed in the study group for the symptoms listed above. What is more, a significant improvement was achieved in the subjective assessment of the quality of life in all patients receiving sodium butyrate.
In Banasiewicz et al. [7] conducted a randomized clinical trial in a group of 66 patients with a long history of IBS diagnosed on the basis of the ROME II Diagnostic Criteria. The patients were divided into the control group (n = 32) and the study group receiving sodium butyrate (n = 34) at 300 mg/day (2 × 150 mg). The follow-up was 4, and then 12 weeks, with data collected using the Visual Analogue Scale for IBS (VAS-IBS). The following symptoms were assessed: pain in the epigastric region, incidence of flatulence, bowel movement disorders, mucus in stool and the quality of life (based on the IBS-QoL questionnaire). Four weeks after the start of the study, a significant decrease in the incidence of epigastric pain and a reduction in the severity of pain after meals were noted in the group receiving sodium butyrate. After 12 weeks, there was a statistically significant decrease in the incidence of all the symptoms studied, accompanied by an improvement in the patients&#; QoL. In subsequently published results [8], based on the closed question (yes or no) &#;Did you achieve good relief from abdominal discomfort or pain associated with IBS during the last week preceding the follow-up visit?&#;, &#;Yes&#; answers were achieved respectively in 32 and 6.25% of the patients (p < 0.01) in the study and control groups at week 4 of the study, and in 53 and 15.6% of the patients (p < 0.01), respectively, at week 12 of the study. Importantly, patients in both groups continued previously prescribed therapy (e.g. drotaverine, trimebutine) throughout the whole duration of the study, and received standard treatment for at least 3 months before the inclusion in the study. The authors concluded that butyric acid used as adjunct therapy in the treatment of IBS reduced the incidence of selected clinical symptoms, however without any effect on their severity.
Abdominal pain in patients with IBS is typically a result of disorders related to digestion and fermentation, and the build-up of gases in the gut lumen. The underlying causes of functional diseases have not been fully investigated and require further study, however existing hypotheses suggest that pain is a consequence of transmission abnormalities in the gut-brain axis. In patients with intestinal dysfunctions (IBS) sodium butyrate is one of the key factors contributing to gut homeostasis, enhancing natural processes of healing and regeneration in the intestinal epithelium. A decreased incidence of pain characteristic of IBS may be attributable to a diminished receptor sensitivity in the gut [9]. Based on an animal model butyric acid was shown to have an ability to increase the neuronal concentration in the Enteric Nervous System via phenotypic changes in the enteric neurons [10], which in turn has a favourable effect on colonic transit [11].
Another study assessed the efficacy of butyric acid in IBS. Fifty patients with IBS were divided into two subgroups &#; IBS with constipation (IBS-C) and IBS with diarrhoea (IBS-D) &#; and treated with butyric acid in the form of enteric-coated tablets at a dose of 1 g/day. The IBS form and the severity of symptoms were recorded at baseline and at the end of the study. Butyric acid treatment resulted in a reduction or normalization of symptoms in 71% of patients with IBS-D and in 16% of patients with IBS-C (p < 0.005) [12].
As of today, more than 1,000 bacteria residing in the human gastrointestinal tract have been detected. A vast majority of them belong to about a dozen genera. In adults, Firmicutes and Bacteroidetes are the most abundant phyla, and the Firmicutes to Bacteroidetes ratio appears to determine the bacterial balance in the gastrointestinal tract (in healthy adults Firmicutes is the dominant phylum, however the proportion evolves with age and changes as a result of specific pathological processes) [13]. Pozuelo et al. [5] studied the microbiome in 113 patients with IBS and 66 healthy individuals. Stool samples were collected from the study&#;s subjects twice, at a monthly interval. Bacterial diversity in patients with IBS was found to be reduced in a statistically significant manner, which resulted from a considerably lower abundance of butyrogenic bacteria (p = 0.002, q < 0.06), particularly in patients with IBS-D and mixed IBS. The findings of the study are important for considering the benefits of using probiotics in patients with IBS. The most popular probiotic products contain lactic acid bacteria. Assuming colonic colonization with these strains, an increase in local lactate production can be achieved. Tsukahara et al. identified among the commensal bacteria residing in the human gastrointestinal tract a group of Megasphaera elsdenii bacteria belonging to Firmicutes which have an ability to convert lactates into butyrate [14]. Perhaps the same mechanism is responsible for the observed efficacy of lactic acid bacteria in IBS.
Functional constipation
The composition of bacterial flora is determined by two main classes of bacteria: Firmicutes (a phylum of common Gram-positive bacteria comprising, among others, Clostridium, lactic bacteria and butyric-acid producing bacteria) and Bacteroidetes (Gram-negative rods classified as obligate anaerobes), making up 90&#;99% of the total microbiome; Firmicutes is the dominant phylum (50&#;80% of the microbiome) [15].
A study conducted in a group of 161 individuals aged 65&#;96 years showed that their stool microbiota composition (assessed by molecular biology methods), compared to that determined in nine young volunteers (28&#;46 years old), shifted significantly toward Bacteroidetes [16].
Basic research in an animal model demonstrated that butyric acid increased the effectiveness of peristalsis by improving colonic smooth muscle contractility and regulating neurotransmission, particularly in cases of impaired peristalsis accompanying functional constipation in the elderly [17].
A double-blind, randomized, placebo-controlled study conducted in a group of 11 healthy volunteers involved self-administration of enemas by the study&#;s subjects according to the following regimen: enema with 100 mmol/l of butyric acid in week 1; 50 mmol/l of butyric acid in week 2; and placebo (saline solution) in week 3 of the study. At the start and end of each test period, a rectal barostat measurement was performed to determine the severity of pain, discomfort, and the urge to pass gas or stool. Butyric acid administered at 50 mmol/l resulted in a decrease in pain score by 23.9%, at 100 mmol/l &#; by 42.1%; and a decrease in discomfort score by 44.2% and 69.0%, respectively, at a pressure of 4 mm Hg. The authors concluded that rectal administration of butyric acid led to a dose-dependent decrease in visceral sensitivity which plays a key role in disorders of intestinal motility (including functional constipation), abdominal pain or discomfort [18].
A beneficial effect of butyric acid as one constituent of a multifaceted mechanism modulating gastrointestinal function has also been stressed in patients with stoma and coexisting constipation. Butyric acid supplementation combined with the use of probiotics should be adopted as one of the basic therapeutic strategies in this patient group, preceding treatment with laxatives [19].
Sodium butyrate has also been introduced into the algorithm of dietary treatment in patients with stoma [20].
Diarrhoea
Sodium butyrate may also prevent diarrhoea through an increased passive absorption of water in the colon and its effects on the gut microflora [21].
Butyrate is easy to administer and counteracts acute dehydration; it may be used in long-term treatment and prevention of traveller&#;s diarrhoea affecting individuals moving from countries with higher hygienic standards to destinations with a lower hygienic status. Even though antibacterial substances bring rapid and tangible therapeutic benefits in the treatment of traveller&#;s diarrhoea, there is no possibility to prevent the illness. In addition to standard recommendations such as additional caution about hygiene and food, travellers are advised to eat warm foods, drink bottled water, and eat only fruit and vegetables with intact skin. Pharmacological recommendations include rifaxamin, fluoroquinolone and Lactobacillus bacteria. Krokowicz et al. [22] made an attempt to demonstrate the preventive activity of a mixture of organic acids in a lipid matrix (250 mg of sodium butyrate; 100 mg of fumaric acid; 60 mg of citric acid; 50 mg of sorbic acid; 40 mg of malic acid) in traveller&#;s diarrhoea. A total of 42 patients completed the study, including 20 in the placebo group and 22 individuals taking the acid mixture 3 days before the journey. The incidence of traveller&#;s diarrhoea was 4.5% in the treatment group, and 40% in the placebo group. In addition, a statistically significant improvement was noted in the study group in terms of reduction in the number of bowel movements a day and relief of gastric symptoms (abdominal pain, nausea). Similar beneficial effects are observed after using a mixture of sodium butyrate and silicon dioxide (A300) [23].
Persistent and difficult-to-treat diarrhoea is one of the more common side effects of chemo- and radiotherapy in cancer treatment [24]. Karakulska-Prystupiuk [25] described the case of a patient with diarrhoea which developed during the period of myelosuppression in chemotherapy administered for anaplastic lymphoma. The differential diagnosis included recurrence of the primary disease and gastrointestinal tract infection. Subsequent microbiological tests excluded bacterial and fungal diarrhoea, and cytomegalovirus infection. Diarrhoea caused a considerable weight loss: 12 kg over 2 months. Dietary supplementation with butyric acid at 300 mg daily was initiated. After just several days the patient reported a substantial relief of symptoms and elimination of diarrhoea. In addition, the patient reported an elevated appetite and an increased frequency of meals. During successive follow-up examinations the patient was found to gradually return to his normal body weight.
Non-specific inflammatory bowel diseases
Butyric acid shows a protective effect in inflammatory response secondary to inflammatory bowel diseases. Recent research indicates that chronic stimulation by interferon γ (IFN-γ) plays an important role in the formation of inflammation-associated colon cancer, and the development of colitis ulcerosa is linked to the gene encoding IFN-γ. An in vitro study conducted on human intestinal epithelial cells sampled from the colon of patients with colitis ulcerosa showed an increased infiltration with unspecified T cells in the mechanism of activation of the signal transducer and activator of transcription 1 (STAT1). Butyric acid was also demonstrated to effectively inhibit STAT1 activation by reducing IFN-γ production, which results in the apoptosis of T cells of unspecified type and the suppression of the inflammation [26].
Molecular biological methods offer a possibility to gradually identify the relationship between the microbiome, diet, immune response and, consequently, the development of inflammatory bowel diseases. Experience shows that bowel inflammation may be induced by fat-rich diet. In one study, the composition of the microbiota in intestinal biopsies and stool samples was assessed using gene sequencing methods in a group of 231 subjects. One of the findings was a decrease in the amount of Anaerostipes bacteria belonging to Furmicutes in IBD patients who are active smokers or have a history of smoking. Similarly to Megasphaera elsdenii discussed above, Anaerostipes are bacteria responsible for the conversion of lactate to butyrate. In addition, the study revealed that patients with IBD had a reduced amount of Roseburia and Phascolarctobacterium bacteria which produce butyric and propionic acids in the colon [27]. The described ability of some bacteria to convert lactates to butyric acid may also be effectively induced by the commercially available mixture of eight lactic acid-producing probiotic bacteria &#; VSL#3 (Lactobacillus plantarum, Lactobacillus delbrueckii subsp. Bulgaricus, Lactobacillus paracasei, Lactobacillus acidophilus, Bifidobacterium breve, Bifidobacterium longum, Bifidobacterium infantis and Streptococcus salivarius). Studies in humans who used VSL#3 orally showed the preparation to reduce the clinical symptoms and severity of the inflammatory process in patients with pouchitis (after pancolectomy due to colitis ulcerosa) [28], and mild and moderate colitis ulcerosa [29].
A beneficial effect of sodium butyrate in post-proctocolectomy patients has also been demonstrated in research undertaken by the authors of the present publication. In a group of patients with pouchitis, sodium butyrate was found to be a beneficial element of combined therapy, accelerating the remission of symptoms &#; primarily diarrhoea and pain. However, the main effect linked to sodium butyrate was a reduction in the incidence and severity of inflammation in patients taking microencapsulated sodium butyrate at 2 × 200 mg [30].
A high concentration of IgA-coated bacteria plays a role in inducing inflammatory bowel diseases, mainly Crohn&#;s disease. A group of researchers [31] assessed the effect of sodium butyrate on the composition of the microbiota in IBD-prone IL-10&#;/&#; mice. At 8 weeks old, the mice were divided into three groups (four pergroup): normal (C57BL/6 &#; negative control), IL-10&#;/&#; (positive control) and IL-10&#;/&#; treated with sodium butyrate administered in drinking water (study group). The severity of colitis symptoms, and the concentrations of proinflammatory cytokines and short-chain fatty acids were assessed in the proximal section of the colon, whereas the percentage of IgA-coated bacteria and the microbiota composition in stool samples were evaluated by 16S ribosomal RNA analysis 4 weeks after the initiation of treatment. The study found that sodium butyrate reduced the histologically observed severity of colitis and decreased the level of tumor necrosis factor α (TNF-α) and IL-6 in IL-10&#;/&#; mice treated with sodium butyrate compared with the positive control. At the level of microbiota composition, a reduction in IgA-coated and Bacteroidetes bacteria, and an increase in the group of Firmicutes, were noted in IL-10&#;/&#; mice treated with sodium butyrate. The authors concluded that sodium butyrate lowered the risk of colitis, possibly by modifying the composition of the microbiota, i.e. enriching its biodiversity and reducing the amount of colitogenic IgA-coated bacteria.
Effect in cancer prevention and treatment
A study by Zhang et al. [32] analyzing human colorectal cancer cell lines (HCT-116 and HT-29) treated with sodium butyrate at concentrations ranging from 0.5&#;5 mM found that sodium butyrate inhibited the growth of the studied cancer cells, stimulated autophagy and induced apoptotic cell death, thus revealing a new possible mechanism underlying the anticancer activity of butyric acid.
Mouse studies revealed a 75% reduction in the risk of colon cancer in animals fed fibre-rich diets in a mechanism with butyric acid-producing colonic bacteria acting as intermediaries &#; compared to bacteria-free mice. It is concluded that the presence of bacteria producing butyric acid is a prerequisite for a fibre-rich diet to exert its beneficial effect which has been extensively described in the literature [33].
Another interesting role of sodium butyrate was described by Bueno-Carrazco et al. [34]. The authors found that oral administration of sodium butyrate supports the anti-cancer efficacy of photodynamic therapy in astrocytoma cells, most likely in a mechanism based on the modulation of gene expression and differentiation of cancer cells.
The synergistic cytotoxic effect on cancer cells was also demonstrated in a study conducted by Encarnacao et al. [35]. The authors showed that butyric acid increased the sensitivity of resistant cancer cells to irinotecan, a second-line drug used in the treatment of colon cancer. The finding may put a new perspective on the application of irinotecan which is regarded by clinicians who balance benefit against risk in the choice of therapy as a drug associated with uncertainty and interindividual variability of response. In vitro observations of colon cancer cell lines conducted over a period of up to 96 h showed a significant inhibition of cancer cell proliferation in the group where the cells were simultaneously exposed to irinotecan and butyric acid, compared to the group where only irinotecan was used.
The same group of researchers performed an in vitro assessment of the effect of butyric acid on the uptake of the 18F-labelled glucose analogue (18F-FDG) and the increase in glycolysis in a colon cancer cell line [35, 36]. The results show that the addition of butyric acid reduces the uptake of 18F-FDG and may affect the Warburg effect which is correlated with tumour aggressiveness. The greatest differences were observed at the lowest labelled glucose concentrations which, in turn, most accurately reflects the clinical situation. Furthermore, the results of the study suggest that butyric acid may play a role in cancer cells at an advanced stage of development.
Other applications of butyric acid
In a randomized prospective clinical trial patients with clinically diagnosed diverticulosis (n = 73) were assigned to the control and study groups. The study group received sodium butyrate at 300 mg/day (2 × 150 mg) with a follow-up examination after 12 months. The study was completed by 30 patients receiving sodium butyrate and 22 control group patients receiving placebo. Patients in the study group declared a decrease in the frequency of clinical symptoms of diverticulosis and a significant reduction in the sensation of abdominal discomfort and pain compared to the placebo group [37].
Sodium butyrate in the form of enemas (combined in a mixture with A-300 silicon dioxide) may be a successful method of therapeutic management in patients with radiation proctitis. Sodium butyrate was shown to have an ability to reduce inflammation, as confirmed by clinical and endoscopic assessment. A key aspect related to sodium butyrate which appears to be of great relevance for this challenging and treatment-resistant form of proctitis is a multifaceted mechanism of action of butyrate which prevents inflammation, stimulates proliferation and normalizes the profile of secreted mucus [38].
Conclusions
The body of knowledge about the roles and importance of butyric acid has been expanding steadily, and the mechanisms by which butyric acid affects the relationship between the microbiome and the host are becoming increasingly elucidated. It is currently believed that the clinical aspects of using butyric acid described above arise from the effect of the compound on the local immune system, the mechanisms regulating the gut peristalsis, the severity of inflammatory processes and the regulatory mechanisms of the gut-brain axis [39]. The complex mechanism of action of butyric acid seems to play a vital role in maintaining symbiosis and homeostasis in the human body.
The scope of the present article is limited to oral butyric acid preparations used at doses which provide no possibility for significant quantities of butyric acid to pass into the systemic circulation. Consequently, it excludes studies focused on the role of butyric acid in reducing peripheral insulin resistance in diabetes mellitus type 2 [40] or preventing body weight gain [41], which represent important future challenges for pharmaceutical companies. The coming years are bound to bring new discoveries and fascinating reports on other areas of activity of butyric acid, and therefore new therapeutic opportunities associated with its use.
Conflict of interest
The authors declare no conflict of interest.
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