Inflammatory bowel disease

This article is about bowel inflammation. For the functional disorder, see Irritable bowel syndrome. For the medical journal, see Inflammatory Bowel Diseases.
Inflammatory bowel diseases
Micrograph showing inflammation of the large bowel in a case of inflammatory bowel disease. Colonic biopsy. H&E stain.
SpecialtyGastroenterology
Differential diagnosisGastroenteritis, irritable bowel syndrome, celiac disease
Frequency11.2 million worldwide (2015)[1]
Deaths47,400 worldwide (2015)[2]

Inflammatory bowel disease (IBD) is a group of inflammatory conditions of the colon and small intestine, Crohn's disease and ulcerative colitis being the principal types.[3] Crohn's disease affects the small intestine and large intestine, as well as the mouth, esophagus, stomach and the anus, whereas ulcerative colitis primarily affects the colon and the rectum.[4][5][6]

IBD also occurs in dogs and is thought to arise from a combination of host genetics, intestinal microenvironment, environmental components and the immune system. There is an ongoing discussion, however, that the term "chronic enteropathy" might be better to use than "inflammatory bowel disease" in dogs because it differs from IBD in humans in how the dogs respond to treatment. For example, many dogs respond to only dietary changes compared to humans with IBD, who often need immunosuppressive treatment. Some dogs may also need immunosuppressant or antibiotic treatment when dietary changes are not enough. After having excluded other diseases that can lead to vomiting, diarrhea, and abdominal pain in dogs, intestinal biopsies are often performed to investigate what kind of inflammation is occurring (lymphoplasmacytic, eosinophilic, or granulomatous). In dogs, low levels of cobalamin in the blood have been shown to be a risk factor for negative outcome.[7][8][9]

Signs and symptoms

Signs and symptoms
Crohn's diseaseUlcerative colitis
DefecationOften porridge-like,[10]
sometimes steatorrhea		Often mucus-like
and with blood[10]
TenesmusLess common[10]More common[10]
FeverCommon[10]Indicates severe disease[10]
FistulaeCommon[11] Seldom
Weight lossOftenMore seldom

In spite of Crohn's and UC being very different diseases, both may present with any of the following symptoms: abdominal pain, diarrhea, rectal bleeding, severe internal cramps/muscle spasms in the region of the pelvis and weight loss. Anemia is the most prevalent extraintestinal complication of inflammatory bowel disease.[12][13] Associated complaints or diseases include arthritis, pyoderma gangrenosum, primary sclerosing cholangitis, and non-thyroidal illness syndrome (NTIS).[14] Associations with deep vein thrombosis (DVT)[15] and bronchiolitis obliterans organizing pneumonia (BOOP) have also been reported.[16] Diagnosis is generally by assessment of inflammatory markers in stool followed by colonoscopy with biopsy of pathological lesions.

Diagnostic findings
Crohn's diseaseUlcerative colitis
Terminal ileum involvementCommonlySeldom
Colon involvementUsuallyAlways
Rectum involvementSeldomUsually (95%)[17]
Involvement around
the anus		Common[11] Seldom
Bile duct involvementNo increase in rate of primary sclerosing cholangitisHigher rate[18]
Distribution of diseasePatchy areas of inflammation (skip lesions)Continuous area of inflammation[17]
EndoscopyDeep geographic and serpiginous (snake-like) ulcers Continuous ulcer
Depth of inflammationMay be transmural, deep into tissues[11][5] Shallow, mucosal
StenosisCommonSeldom
Granulomas on biopsyMay have non-necrotizing non-peri-intestinal crypt granulomas[11][19][20] Non-peri-intestinal crypt granulomas not seen[21]

Causes

Pathophysiology
Crohn's diseaseUlcerative colitis
Cytokine responseAssociated with Th17[22]Vaguely associated with Th2

IBD is a complex disease which arises as a result of the interaction of environmental and genetic factors leading to immunological responses and inflammation in the intestine.[4]

Diet

A 2022 study found that diets with increased intake of fruits and vegetables, reduction of processed meats and refined carbohydrates, and preference of water for hydration were associated with lower risk of active symptoms with IBD, although increased intake of fruits and vegetables alone did not reduce risk of symptoms with Crohn's disease.[23]

Dietary patterns are associated with a risk for ulcerative colitis. In particular, subjects who were in the highest tertile of the healthy dietary pattern had a 79% lower risk of ulcerative colitis.[24]

Gluten sensitivity is common in IBD and associated with having flareups. Gluten sensitivity was reported in 23.6 and 27.3% of Crohn's disease and ulcerative colitis patients, respectively.[25]

A diet high in protein, particularly animal protein, and/or high in sugar may be associated with increased risk of inflammatory bowel disease and relapses.[26][27]

Microbiota

As a result of microbial symbiosis and immunity, alterations in the gut microbiome may contribute to inflammatory gut diseases.[28] IBD-affected individuals have been found to have 30–50 percent reduced biodiversity of commensal bacteria, such as decreases in Bacillota (namely Lachnospiraceae) and Bacteroidota. Further evidence of the role of gut flora in the cause of inflammatory bowel disease is that IBD-affected individuals are more likely to have been prescribed antibiotics in the 2–5 year period before their diagnosis than unaffected individuals.[29] The enteral bacteria can be altered by environmental factors, such as concentrated milk fats (a common ingredient of processed foods and confectionery) or oral medications such as antibiotics and oral iron preparations.[30] The mucosal microbiota in the large intestine of IBD patients with active inflammation was found to be associated with pro-inflammatory changes to the host epigenome.[31] However, large international studies have failed to identify a single microbial biomarker of IBD indicating it's not driven by any single micro-organism.[32]

Breach of intestinal barrier

Further information: Intestinal permeability

Loss of integrity of the intestinal epithelium plays a key pathogenic role in IBD.[33] Dysfunction of the innate immune system as a result of abnormal signaling through immune receptors called toll-like receptors (TLRs)—which activates an immune response to molecules that are broadly shared by multiple pathogens—contributes to acute and chronic inflammatory processes in IBD colitis and associated cancer.[34] Changes in the composition of the intestinal microbiota are an important environmental factor in the development of IBD. Detrimental changes in the intestinal microbiota induce an inappropriate (uncontrolled) immune response that results in damage to the intestinal epithelium. Breaches in this critical barrier (the intestinal epithelium) allow further infiltration of microbiota that, in turn, elicit further immune responses. IBD is a multifactorial disease that is nonetheless driven in part by an exaggerated immune response to gut microbiota that causes defects in epithelial barrier function.[35]

Oxidative stress and DNA damage

Pereira et al.[36] reviewed evidence from numerous studies indicating that oxidative stress and DNA damage likely have a role in the pathophysiology of IBD. Oxidative DNA damage as measured by 8-OHdG levels was found to be significantly increased in patients with IBD compared to control patients, and in inflamed mucosa compared with non-inflamed mucosa.[36]

Genetics

Associated loci pane. Pink genes are in IBD associated loci, blue are not.

A genetic component to IBD has been recognized for over a century.[37] Research that has contributed to understanding of the genetics include studies of ethnic groups (e.g., Ashkenazi Jews, Irish), familial clustering, epidemiological studies, and twin studies. With the advent of molecular genetics, understanding of the genetic basis has expanded considerably, particularly in the past decade.[38] The first gene linked to IBD was NOD2 in 2001. Genome-wide association studies have since added to understanding of the genomics and pathogenesis of the disease. More than 200 single nucleotide polymorphisms (SNPs or "snips") are now known to be associated with susceptibility to IBD.[39] One of the largest genetic studies of IBD was published in 2012 .[40] The analysis explained more of the variance in Crohn's disease and ulcerative colitis than previously reported.[38] The results suggested that commensal microbiota are altered in such a way that they act as pathogens in inflammatory bowel diseases. Other studies show that mutations in IBD-associated genes might interfere with the cellular activity and interactions with the microbiome that promote normal immune responses.[41] Many studies identified that microRNAs dysregulation involved in IBD and to promote colorectal cancer.[42] By 2020, single-cell RNA sequencing analysis was launched by a small consortium using IBD patient biopsy material in a search for therapeutic targets.[43]

Diagnosis

a-f)Common endoscopic findings in individuals with inflammatory bowel disease

The diagnosis is usually confirmed by biopsies on colonoscopy. Fecal calprotectin is useful as an initial investigation, which may suggest the possibility of IBD, as this test is sensitive but not specific for IBD.[44][45]

Differential diagnosis

Other diseases may cause an increased excretion of fecal calprotectin, such as infectious diarrhea, untreated coeliac disease, necrotizing enterocolitis, intestinal cystic fibrosis and neoplastic pediatric tumor cells.[46]

Conditions with similar symptoms as Crohn's disease includes intestinal tuberculosis, Behçet's disease, ulcerative colitis, nonsteroidal anti-inflammatory drug enteropathy, irritable bowel syndrome and coeliac disease.[47]

Conditions with similar symptoms as ulcerative colitis includes acute self-limiting colitis, amebic colitis, schistosomiasis, Crohn's disease, colon cancer, irritable bowel syndrome, intestinal tuberculosis and nonsteroidal anti-inflammatory drug enteropathy.[47]

Liver function tests are often elevated in inflammatory bowel disease, and are often mild and generally return spontaneously to normal levels.[48] The most relevant mechanisms of elevated liver functions tests in IBD are drug-induced hepatotoxicity and fatty liver.[48]

Classification

The chief types of inflammatory bowel disease are Crohn's disease and ulcerative colitis (UC). Inflammatory bowel diseases fall into the class of autoimmune diseases, in which the body's own immune system attacks elements of the digestive system.[49]

Accounting for fewer cases are other forms of IBD, which are not always classified as typical IBD:

No disease specific markers are currently known in the blood, enabling the reliable separation of Crohn's disease and ulcerative colitis patients. The way doctors can tell the difference between Crohn's disease and UC is the location and nature of the inflammatory changes. Crohn's can affect any part of the gastrointestinal tract, from mouth to anus (skip lesions), although a majority of the cases start in the terminal ileum. Ulcerative colitis, in contrast, is restricted to the colon and the rectum.[51] Microscopically, ulcerative colitis is restricted to the mucosa (epithelial lining of the gut), while Crohn's disease affects the full thickness of the bowel wall ("transmural lesions"). Lastly, Crohn's disease and ulcerative colitis present with extra-intestinal manifestations (such as liver problems, arthritis, skin manifestations and eye problems) in different proportions.

In 10–15% of cases,[52] a definitive diagnosis neither of Crohn's disease nor of ulcerative colitis can be made because of idiosyncrasies in the presentation. In this case, a diagnosis of indeterminate colitis may be made. Although a recognised definition, not all centres refer to this.

Treatment

Management
Crohn's diseaseUlcerative colitis
MesalazineLess useful[53]More useful[53]
AntibioticsEffective in long-term[54]Generally not useful[55]
SurgeryOften returns following
removal of affected part		Usually cured by removal
of colon

Surgery

CD and UC are chronic inflammatory diseases, and are not medically curable.[56] However, ulcerative colitis can in most cases be cured by proctocolectomy, although this may not eliminate extra-intestinal symptoms. An ileostomy will collect feces in a bag. Alternatively, a pouch can be created from the small intestine; this serves as the rectum and prevents the need for a permanent ileostomy. Between one-quarter and one-half of patients with ileo-anal pouches do have to manage occasional or chronic pouchitis.[57]

Surgery cannot cure Crohn's disease but may be needed to treat complications such as abscesses, strictures or fistulae.[58] Severe cases may require surgery, such as bowel resection, strictureplasty or a temporary or permanent colostomy or ileostomy. In Crohn's disease, surgery involves removing the worst inflamed segments of the intestine and connecting the healthy regions, but unfortunately, it does not cure Crohn's or eliminate the disease. At some point after the first surgery, Crohn's disease can recur in the healthy parts of the intestine, usually at the resection site. (For example, if a patient with Crohn's disease has an ileocecal anastomosis, in which the caecum and terminal ileum are removed and the ileum is joined to the ascending colon, their Crohn's will nearly always flare-up near the anastomosis or in the rest of the ascending colon).

Medical therapies

Medical treatment of IBD is individualised to each patient.[56] The choice of which drugs to use and by which route to administer them (oral, rectal, injection, infusion) depends on factors including the type, distribution, and severity of the patient's disease, as well as other historical and biochemical prognostic factors, and patient preferences. For example, mesalazine is more useful in ulcerative colitis than in Crohn's disease.[53] Generally, depending on the level of severity, IBD may require immunosuppression to control the symptoms, with drugs such as prednisone, tumor necrosis factor inhibitors (TNF inhibitors), azathioprine, methotrexate, or 6-mercaptopurine.

Steroids, such as the glucocorticoid prednisone, are frequently used to control disease flares and were once acceptable as a maintenance drug. Biological therapy for inflammatory bowel disease, especially the TNF inhibitors, are used in people with more severe or resistant Crohn's disease and sometimes in ulcerative colitis.[59]

Treatment is usually started by administering drugs with high anti-inflammatory effects, such as prednisone. Once the inflammation is successfully controlled, another drug to keep the disease in remission, such as mesalazine in UC, is the main treatment. If further treatment is required, a combination of an immunosuppressive drug (such as azathioprine) with mesalazine (which may also have an anti-inflammatory effect) may be needed, depending on the patient. Controlled release budesonide is used for mild ileal Crohn's disease.[56]

Nutritional and dietetic therapies

Exclusive enteral nutrition is a first-line therapy in pediatric Crohn's disease with weaker data in adults.[60]: 331 [61] Evidence supporting exclusive enteral nutrition in ulcerative colitis is lacking.[60]: 333 

Nutritional deficiencies play a prominent role in IBD. Malabsorption, diarrhea, and GI blood loss are common features of IBD. Deficiencies of B vitamins, fat-soluble vitamins, essential fatty acids, and key minerals such as magnesium, zinc, and selenium are extremely common and benefit from replacement therapy. Dietary interventions, including certain exclusion diets like the specific carbohydrate diet (SCD) can be beneficial for symptom management.[62] Dietary fiber interventions, such as psyillium supplementation (a mixture of soluble and insoluble fibers), may relieve symptoms as well as induce/maintain remission by altering the microbiome composition of the GI tract, thereby improving regulation of immune function, reducing inflammation, and helping to restore the intestinal mucosal lining.[63]

Anaemia is commonly present in both ulcerative colitis and Crohn's disease. Due to raised levels of inflammatory cytokines which lead to the increased expression of hepcidin, parenteral iron is the preferred treatment option as it bypasses the gastrointestinal system, has lower incidence of adverse events and enables quicker treatment. Hepcidin itself is also an anti-inflammatory agent. In the murine model very low levels of iron restrict hepcidin synthesis, worsening the inflammation that is present.[64] Enteral nutrition has been found to be efficient to improve hemoglobin level in patients with inflammatory bowel disease, especially combined with erythropoietin.[65]

Microbiome

There is preliminary evidence of an infectious contribution to inflammatory bowel disease in some patients that may benefit from antibiotic therapy, such as with rifaximin.[66] The evidence for a benefit of rifaximin is mostly limited to Crohn's disease with less convincing evidence supporting use in ulcerative colitis.[67][68]

Fecal microbiota transplant is a relatively new treatment option for IBD which has attracted attention since 2010.[69][70] Some preliminary studies have suggested benefits similar to those in Clostridium difficile infection but a review of use in IBD shows that FMT is safe, but of variable efficacy. A 2014 review stated that more randomized controlled trials were needed.[70]

Alternative medicine

Complementary and alternative medicine approaches have been used in inflammatory bowel disorders.[71] Evidence from controlled studies of these therapies has been reviewed; risk of bias was quite heterogeneous. The best supportive evidence was found for herbal therapy, with Plantago ovata and curcumin in UC maintenance therapy, wormwood in CD, mind/body therapy and self-intervention in UC, and acupuncture in UC and CD.[72]

Novel approaches

Stem cell therapy is undergoing research as a possible treatment for IBD. A review of studies suggests a promising role, although there are substantial challenges, including cost and characterization of effects, which limit the current use in clinical practice.[73]

Psychological interventions

Currently, there is no evidence to recommend psychological treatment, such as psychotherapy, stress management and patient's education, to all adults with IBD in general.[74] These treatments had no effect on quality of life, emotional well-being and disease activity.[74] The need for these approaches should be individually assessed and further researched to identify subgroups and determine type of therapy that may benefit individuals with IBD.[74] In adolescents population such treatments may be beneficial on quality of life and depression, although only short-term effects have been found, which also imposes the need for further research.[74]

Prognosis

Complications
Crohn's
disease		Ulcerative
colitis
Nutrient deficiencyHigher risk
Colon cancer riskSlightConsiderable
Percent of people with extraintestinal complications[75][76][77]
Iritis/uveitisFemales2.2%3.2%
Males1.3%0.9%
Primary sclerosing
cholangitis		Females0.3%1%
Males0.4%3%
Ankylosing
spondylitis		Females0.7%0.8%
Males2.7%1.5%
Pyoderma
gangrenosum		Females1.2%0.8%
Males1.3%0.7%
Erythema nodosumFemales1.9%2%
Males0.6%0.7%

While IBD can limit quality of life because of pain, vomiting, and diarrhea, it is rarely fatal on its own. Fatalities due to complications such as toxic megacolon, bowel perforation and surgical complications are also rare.. Fatigue is a common symptom of IBD and can be a burden.[78]

Around one-third of individuals with IBD experience persistent gastrointestinal symptoms similar to irritable bowel syndrome (IBS) in the absence of objective evidence of disease activity.[79] Despite enduring the side-effects of long-term therapies, this cohort has a quality of life that is not significantly different to that of individuals with uncontrolled, objectively active disease, and escalation of therapy to biological agents is typically ineffective in resolving their symptoms.[80] The cause of these IBS-like symptoms is unclear, but it has been suggested that changes in the gut-brain axis, epithelial barrier dysfunction, and the gut flora may be partially responsible.[81]

While patients of IBD do have an increased risk of colorectal cancer, this is usually caught much earlier than the general population in routine surveillance of the colon by colonoscopy, and therefore patients are much more likely to survive.

New evidence suggests that patients with IBD may have an elevated risk of endothelial dysfunction and coronary artery disease.[82][83]

The goal of treatment is toward achieving remission, after which the patient is usually switched to a lighter drug with fewer potential side effects. Every so often, an acute resurgence of the original symptoms may appear; this is known as a "flare-up". Depending on the circumstances, it may go away on its own or require medication. The time between flare-ups may be anywhere from weeks to years, and varies wildly between patients – a few have never experienced a flare-up.

Life with IBD can be challenging; however, many sufferers lead relatively normal lives. IBD carries a psychological burden due to stigmatization of being diagnosed, leading to high levels of anxiety, depression, and a general reduction in the quality of life for sufferers.[84][85] Although living with IBD can be difficult, there are numerous resources available to help families navigate the ins and out of IBD, such as the Crohn's and Colitis Foundation of America (CCFA).

Epidemiology

IBD resulted in a global total of 51,000 deaths in 2013 and 55,000 deaths in 1990.[86] The increased incidence of IBD since World War 2 has been correlated to the increase in meat consumption worldwide, supporting the claim that animal protein intake is associated with IBD.[87] However, there are many environmental risk factors that have been linked to the increased and decreased risk of IBD, such as smoking, air pollution and greenspace, urbanization and Westernization.[88] Inflammatory bowel diseases are increasing in Europe.[89] Incidence and prevalence of IBD has risen steadily for the last decades in Asia, which could be related changes in diet and other environmental factors.[90]

Around 0.8% of people in the UK have IBD.[91] Similarly, around 270,000 (0.7%) of people in Canada have IBD,[92] with that number expected to rise to 400,000 (1%) by 2030.[93]

Research

The following treatment strategies are not used routinely, but appear promising in some forms of inflammatory bowel disease.

Initial reports[94] suggest that "helminthic therapy" may not only prevent but even control IBD: a drink with roughly 2,500 ova of the Trichuris suis helminth taken twice monthly decreased symptoms markedly in many patients. It is even speculated that an effective "immunization" procedure could be developed—by ingesting the cocktail at an early age.

Prebiotics and probiotics are focusing increasing interest as treatments for IBD. Currently, there is evidence to support the use of certain probiotics in addition to standard treatments in people with ulcerative colitis but there is no sufficient data to recommend probiotics in people suffering Crohn's disease. Further research is required to identify specific probiotic strains or their combinations and prebiotic substances for therapies of intestinal inflammation.[95] Currently, the probiotic strain, frequency, dose and duration of the probiotic therapy are not established.[96] In severely ill people with IBD there is a risk of the passage of viable bacteria from the gastrointestinal tract to the internal organs (bacterial translocation) and subsequent bacteremia, which can cause serious adverse health consequences.[96] Live bacteria might not be essential because of beneficial effects of probiotics seems to be mediated by their DNA and by secreted soluble factors, and their therapeutic effects may be obtained by systemic administration rather than oral administration.[96][97]

In 2005 New Scientist published a joint study by Bristol University and the University of Bath on the apparent healing power of cannabis on IBD. Reports that cannabis eased IBD symptoms indicated the possible existence of cannabinoid receptors in the intestinal lining, which respond to molecules in the plant-derived chemicals. CB1 cannabinoid receptors – which are known to be present in the brain – exist in the endothelial cells which line the gut, it is thought that they are involved in repairing the lining of the gut when damaged.[98]

The team deliberately damaged the cells to cause inflammation of the gut lining and then added synthetically produced cannabinoids; the result was that gut started to heal: the broken cells were repaired and brought back closer together to mend the tears. It is believed that in a healthy gut, natural endogenous cannabinoids are released from endothelial cells when they are injured, which then bind to the CB1 receptors. The process appears to set off a wound-healing reaction, and when people use cannabis, the cannabinoids bind to these receptors in the same way.[98]

Previous studies have shown that CB1 receptors located on the nerve cells in the gut respond to cannabinoids by slowing gut motility, therefore reducing the painful muscle contractions associated with diarrhea. CB2, another cannabinoid receptor predominantly expressed by immune cells, was detected in the gut of IBD sufferers at a higher concentration. These receptors, which also respond to chemicals in cannabis, appear to be associated with apoptosis – programmed cell death – and may have a role in suppressing the overactive immune system and reducing inflammation by mopping up excess cells.[98]

Activation of the endocannabinoid system was found efficient in ameliorating colitis and increasing the survival rate of mice, and reducing remote organ changes induced by colitis, further suggest that modulation of this system is a potential therapeutic approach for IBDs and the associated remote organ lesions.[99]

Alicaforsen is a first generation antisense oligodeoxynucleotide designed to bind specifically to the human ICAM-1 messenger RNA through Watson-Crick base pair interactions in order to subdue expression of ICAM-1.[100] ICAM-1 propagates an inflammatory response promoting the extravasation and activation of leukocytes (white blood cells) into inflamed tissue.[100] Increased expression of ICAM-1 has been observed within the inflamed intestinal mucosa of ulcerative colitis, pouchitis and Crohn's sufferers where ICAM-1 over production correlated with disease activity.[101] This suggests that ICAM-1 is a potential therapeutic target in the treatment of these diseases.[102][103]

Cannabinoid CB2 receptor agonists are found to decrease the induction of ICAM-1 and VCAM-1 surface expression in human brain tissues and primary human brain endothelial cells (BMVEC) exposed to various pro-inflammatory mediators.[104]

In 2014, an alliance among the Broad Institute, Amgen and Massachusetts General Hospital formed with the intention to "collect and analyze patient DNA samples to identify and further validate genetic targets."[105]

In 2015, a meta-analysis on 938 IBD patients and 953 controls, IBD was significantly associated with having higher odds of vitamin D deficiency.[106]

Gram-positive bacteria present in the lumen could be associated with extending the time of relapse for ulcerative colitis.[107]

Bidirectional pathways between depression and IBD have been suggested [108] and psychological processes have been demonstrated to influence self-perceived physical and psychological health over time.[109] IBD-disease activity may impact quality of life and over time may significantly affect individual's mental well-being, which may be related to the increased risk to develop anxiety and/or depression.[108][110][111] On the other hand, psychological distress may also influence IBD activity.[112]

Higher rates of anxiety and depression are observed among those with IBD compared to healthy individuals, which correlated with disease severity.[110][112] Moreover, anxiety and depression rates increase during active disease compared with inactive phases.[112]

See also

References

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