Antioxidant, Anti-Inflammatory, and Microbial-Modulating Activities of Essential Oils: Implications in Colonic Pathophysiology.

Essential oils (EOs) are a complex mixture of hydrophobic and volatile compounds synthesized from aromatic plants, most of them commonly used in the human diet. In recent years, many studies have analyzed their antimicrobial, antioxidant, anti-inflammatory, immunomodulatory and anticancer properties in vitro and on experimentally induced animal models of colitis and colorectal cancer. However, there are still few clinical studies aimed to understand their role in the modulation of the intestinal pathophysiology. Many EOs and some of their molecules have demonstrated their efficacy in inhibiting bacterial, fungi and virus replication and in modulating the inflammatory and oxidative processes that take place in experimental colitis. In addition to this, their antitumor activity against colorectal cancer models makes them extremely interesting compounds for the modulation of the pathophysiology of the large bowel. The characterization of these EOs is made difficult by their complexity and by the different compositions present in the same oil having different geographical origins. This review tries to shift the focus from the EOs to their individual compounds, to expand their possible applications in modulating colon pathophysiology.

Refractory Complex Crohn's Perianal Fistulas: A Role for Autologous Microfragmented Adipose Tissue Injection.

BACKGROUND: Complex perianal fistulas represent one of the most challenging manifestations of Crohn's disease. Combined surgical and medical therapy with biologic drugs today represent the first-line treatment option, but its efficacy does not exceed 60%. Recently, new therapeutic approaches, such as the use of mesenchymal stromal cells, have shown promising results. The adipose tissue is an abundant and easy to access source. The effectiveness, safety, and feasibility of local injections of microfragmented adipose tissue in patients with refractory complex fistulizing perianal Crohn's disease (PCD) were evaluated. METHODS: Fifteen patients with persistent complex fistulizing PCD after biosurgical approach and subsequent surgical "rescue" repair were treated in S. Orsola-Malpighi Hospital with a single-local administration of microfragmented adipose tissue prepared using a minimal manipulation technique (Lipogems) in a closed system. Clinical outcomes were determined at 24-week follow-ups assessing success rate, defined as combined clinical and radiological remission. RESULTS: Upon clinical examination at 24 weeks, 10 patients had combined remission (clinical and radiographic), 4 patients showed improvements, and 1 patient failed. The results were confirmed in all patients by pelvic MRI. No relevant postoperative complications nor adverse events were reported. CONCLUSION: These results suggest that the local injection of autologous microfragmented adipose tissue is a safe and promising "rescue therapy" for patients with multiresistant complex fistulizing PCD. This approach might be proposed as routine because it is affordable, is minimally invasive, has no risk of sphincteric damage, and can be carried out in a day-surgery setting.

Attachment and Mentalizing Abilities in Patients with Inflammatory Bowel Disease.

BACKGROUND: Inflammatory bowel diseases (IBD) are associated with stress, poor quality of life, and attachment insecurity. Mentalization is the human ability to perceive and reason about feelings and psychological dispositions of one's self and others. The chronic disorders are believed to affect patients' mentalizing abilities and to determine a shift towards attachment insecurity in patients affected. In this study, the attachment dimensions and mentalization were assessed in IBD patients and healthy controls. Further knowledge about the interplay among IBD, mentalization, and attachment might shed more light into the psychopathological mechanisms leading to insecurity and vulnerability to stress in IBD. METHODS: A group of 96 IBD patients and 102 healthy controls completed the attachment style questionnaire (ASQ), the reflective functioning questionnaire (RFQ), and the Eyes test, a performance-based measure of mentalization. RESULTS: Compared to controls, IBD patients have shown more pronounced attachment anxiety and lower scores in the Eyes test. Disease activity was negatively correlated with the Eyes test scores. CONCLUSION: These findings have suggested a plausible impact of IBD on mentalization abilities and have provided new insights into the interplay between IBD, deficits in mentalization, and attachment insecurity. IBD patients are highly vulnerable to disease-related stress that may promote impairments in mentalization. Low mentalization might play a central role in the development of attachment insecurity and emotional disturbances in IBD. The present study's results might open new scenarios for psychodynamic approaches to the treatment of the emotional disturbances in IBD based on attachment and mentalization theory.

Dietary geraniol ameliorates intestinal dysbiosis and relieves symptoms in irritable bowel syndrome patients: a pilot study.

BACKGROUND: (Trans)-3,7-Dimethyl-2,6-octadien-1-ol, commonly called geraniol (Ge-OH), is an acyclic monoterpene alcohol with well-known anti-inflammatory and antimicrobial properties. Ge-OH is a non-toxic compound classified as Generally Recognized As Safe (GRAS) by the US Food and Drug Administration and the European Food Security Agency. METHODS: Ge-OH was orally administered at a maximum daily dose of 8 mg kg(- 1) body weight for four weeks in a delayed release formulation capable of reaching the colon. Fecal microbiota and blood cytokines were analyzed before and after Ge-OH treatment, as well as IBS symptomatology by using Visual Analogue Scale (VAS-IBS). RESULTS: The results show that orally administered Ge-OH is a powerful modulator of the intestinal microbial ecosystem, capable of leading to increased relative abundances of Collinsella and especially Faecalibacterium, a well-known health-promoting butyrate producer consistently found to be decreased in IBS patients. Moreover, Ge-OH strongly improved the clinical symptoms of colitis by significantly reducing the score recorded by the VAS-IBS questionnaire. Clinical improvement was associated with a significant reduction in the circulating MIP-1ß, a chemokine found to be increased in several IBS patients. CONCLUSION: Ge-OH could be a powerful component for food supplement targeted to the treatment of IBS patients. TRIAL REGISTRATION: ISRCTN47041881 , retrospectively registered on 19th July 2018.

The safety of beclomethasone dipropionate in the treatment of ulcerative colitis.

INTRODUCTION: Beclomethasone dipropionate (BDP) is a second-generation corticosteroid that uses novel drug technologies to ensure colonic targeting and potentially reducing systemic corticosteroid concentrations. It is approved for treatment of patients with mild-to-moderate ulcerative colitis (UC) who do not respond to mesalazine. The gut-selective mechanism of action has the potential to improve the safety profile of BDP compared with other conventional corticosteroids. Areas covered: We reviewed the mechanism of action, efficacy, and safety of BDP in the treatment of UC. The positioning of BDP in management algorithms is also discussed. Expert opinion: The highly selective mechanism of action of BDP restricts the steroid-related side effects. BDP is efficacious in the treatment of active UC. Topical formulation is the first choice in distal UC, while oral formulation is used in patients with an extensive involvement of the colon. The rates of adverse events (AE), serious AEs, and steroid-related side-effects are similar to placebo and mesalamine and slightly inferior to traditional corticosteroids.

Eicosapentaenoic Acid Reduces Fecal Levels of Calprotectin and Prevents Relapse in Patients With Ulcerative Colitis.

BACKGROUND & AIMS: High fecal levels of calprotectin indicate mucosal inflammation and have been shown to predict relapse in patients with ulcerative colitis (UC). Eicosapentaenoic acid (EPA), the major component of n-3 fish oil, has anti-inflammatory properties in patients with chronic inflammatory disorders. We performed a placebo-controlled trial of patients with UC at risk of relapse to determine the ability of the free fatty acid form of EPA (EPA-FFA) to reduce intestinal inflammation, using fecal level of calprotectin as a marker. METHODS: From June 2014 to May 2016, 60 patients with UC with a partial Mayo score < 2 and fecal calprotectin ≥150 µg/g, in stable therapy for at least the 3 previous months, were randomly assigned to groups (1:1) given either EPA-FFA (500 mg, twice daily) or placebo for 6 months. A colonoscopy was performed at baseline. Clinical assessments and measurements of fecal calprotectin were made at baseline, at study months 3 and 6, or the time of clinical relapse. Patients with a relapse of UC underwent a second colonoscopy. The primary end point was a 100-point reduction in fecal levels of calprotectin at 6 months from the baseline value; the secondary end point was maintenance of clinical remission at 6 months. RESULTS: The primary end point was achieved by 19 of 30 patients (63.3%) in the EPA-FFA group vs 4 of 30 patients (13.3%) in the placebo group (odds ratio, 12.0; 95% CI, 3.12-46.24; P < .001). The secondary end point was achieved by 23 of 30 patients (76.7%) in the EPA-FFA group vs 15 of 30 (50%) patients in the placebo group (OR, 3.29; 95% CI, 1.08-9.95; P = .035). No serious adverse events were observed. CONCLUSIONS: In a placebo-controlled trial of 60 patients with UC, we found 6 months' administration of EPA-FFA to reduce fecal levels of calprotectin with no serious adverse events. This agent might be used to induce and maintain symptom-free remission in patients with UC. ClinicalTrials.gov number: NCT02179372.

Mucosa-associated microbiota dysbiosis in colitis associated cancer.

Gut microbiota dysbiosis has been associated with inflammatory bowel diseases (IBD). In colorectal cancer, the gut microbiota has also been recognized as potentially involved in aggravating or favoring the tumor development. However, very little is known on the structure and role of the microbiota in colitis associated cancer (CAC), an important complication of IBD in human. Here we analyzed the bacterial and fungal composition of the mucosa associated microbiota of patients suffering CAC, sporadic cancer (SC) and of healthy subjects (HS) by barcode sequences analysis on the following cohort: 7 CAC patients, 10 SC patients and 10 HS using 16S (MiSeq) and ITS2 (pyrosequencing) sequencing, for bacteria and fungi respectively. Mucosa-associated bacterial microbiota in CAC was significantly different from the ones in SC or in HS, while the fungal showed no differences. Comparison between mucosa-associated microbiota on the tumor site or in normal mucosa near the tumor showed very similar patterns. The global mucosa-associated bacterial microbiota in cancer patients was characterized by a restriction in biodiversity but no change for the fungal community. Compared to SC, CAC was characterized by an increase of Enterobacteriacae family and Sphingomonas genus and a decrease of Fusobacterium and Ruminococcus genus. Our study confirms the alteration of the mucosa-associated bacterial microbiota in IBD and SC. Although the cohort is limited in number, this is the first evidence of the existence of an altered bacterial microbiota in CAC clearly different from the one in SC patients.

Real-time elastography for the detection of fibrotic and inflammatory tissue in patients with stricturing Crohn's disease.

PURPOSE: The distinction between active inflammation and fibrosis of the bowel wall is essential for therapeutic decisions in stricturing Crohn's disease. We aimed to assess whether real-time elastography (RTE) with strain ratio measurement could be useful in differentiating fibrotic from inflamed bowel strictures and to evaluate the possible relationship between US techniques and the histology of the stenotic bowel wall. MATERIALS AND METHODS: Bowel ultrasonography (including RTE, color-Doppler and CEUS examination) was prospectively evaluated in 26 patients with symptomatic stricturing Crohn's disease, before surgery. RTE was adopted to evaluate bowel stiffness: five loops of 20 RTE frames were recorded for each stenotic segment and the mean strain ratio (MSR) was obtained. Histology scoring systems both for inflammation and fibrosis were established for surgical specimens. RESULTS: No significant correlation was found between MSR and fibrosis score (P = 0.877). Color-Doppler score was significantly related to gut wall and submucosal thicknesses (P = 0.006 and P = 0.032, respectively). There was no significant correlation between the number of vessels counted at histology and color-Doppler and CEUS examinations (P = 0.170 and P = 0.302, respectively). CONCLUSION: MSR detection was not able to distinguish fibrotic from inflammatory tissue in our selected population. This result could be influenced by the presence of the superimposed inflammation. Larger cohort of patients, further analysis with shear wave elastography, and validated histopathology classification systems for fibrosis and inflammation are necessary to assess if intestinal fibrosis could be reliably detected on the basis of bowel elastic properties.

Prevalence and effectiveness of psychiatric treatments for patients with IBD: A systematic literature review.

OBJECTIVES: Higher prevalence of psychiatric disorders, such as anxiety and depression, has been found in people with Crohn's disease and Ulcerative Colitis compared to the general population. Nowadays, international guidelines advocate psychotherapy and psycho-pharmacological treatments as playing an important role in IBD care. The main goal of this systematic literature review was summarize the evidence on the utilization and effectiveness of treatments for depression and anxiety in persons with IBD. METHODS: A systematic literature review was conducted using three different electronic databases: MEDLINE, PsychINFO, and EMBASE to identify studies reporting the prevalence and efficacy of psycho-pharmacological and psychotherapeutic treatments for IBD. A quality appraisal was conducted using several scales as appropriate for each study design. A narrative synthesis was also performed. RESULTS: Forty-three studies were included. Although a high rate of psychoactive drug use was found in people with IBD, a low proportion of IBD patients have access to psychiatric referral. 1/3 of the studies found that psychotherapy was effective for improving the quality of life, perception of stress, anxiety and depression as well as disease. Antidepressants proved effective in reducing disease activity, gastrointestinal symptoms, anxiety and depression. CONCLUSION: Our results suggest that psychiatric treatment should be implemented in IBD care. However, further studies are needed to confirm the findings of our systematic review.

Attachment and perceived stress in patients with ulcerative colitis, a case-control study.

WHAT IS KNOWN ON THE SUBJECT?: Ulcerative colitis (UC) is a chronic inflammatory disorder associated with high perceived psychological stress. The attachment theory provides a psychodynamic perspective to investigate the relationship between close interpersonal relationships and stress in UC. Researchers have hypothesized that the chronic illness might affect personality trait as the attachment style of patients. WHAT THIS PAPER ADDS TO EXISTING KNOWLEDGE?: UC patients exhibit a more pronounced attachment insecurity that, in turn, resulted as a determinant of psychological stress. This study suggests that UC could determine a shift towards insecurity in the attachment style that, in turn, promotes psychological stress and increases the risk of psychopathologies. WHAT ARE THE IMPLICATIONS FOR PRACTICE?: The more accurate knowledge of attachment insecurity in patients with chronic disorders such as UC may help the nurses to face with often dysfunctional patients' styles of manifesting distress, patterns of help seeking and expectations of health professionals. The knowledge of psychopathological mechanisms in patients with UC could improve the prevention and treatment of psychological disorders in affected patients. ABSTRACT: Introduction Ulcerative colitis (UC) is a chronic disorder characterized by recurrent intestinal symptoms. The attachment theory provides a psychodynamic perspective to investigate the relationship between interpersonal relationships and stress in UC. Aim The aim of this study was to compare the attachment dimensions between UC patients and controls and to evaluate the impact of these dimensions on perceived stress in patients. Method In all, 101 patients with UC completed the attachment style questionnaire and the perceived stress questionnaire (PSQ). Clinical and psychometric parameters were added as predictor variables in a regression with the PSQ score as dependent variable. One hundred and five healthy subjects took part in the study as controls. Results Compared to controls, UC patients exhibited greater scores in relationships as secondary, need for approval and preoccupation with relationships. In UC, disease activity, confidence and preoccupation with relationships resulted predictors of perceived stress. Discussion Compared to healthy controls, UC patients exhibited more pronounced attachment insecurity that, in turn, was a significant predictor of the perceived stress. Implications for practice The knowledge of attachment insecurity may help the nurses and all health care providers to face with dysfunctional patients' styles of manifesting distress, help seeking and expectations of health professionals.

Ancient pathogen-driven adaptation triggers increased susceptibility to non-celiac wheat sensitivity in present-day European populations.

BACKGROUND: Non-celiac wheat sensitivity is an emerging wheat-related syndrome showing peak prevalence in Western populations. Recent studies hypothesize that new gliadin alleles introduced in the human diet by replacement of ancient wheat with modern varieties can prompt immune responses mediated by the CXCR3-chemokine axis potentially underlying such pathogenic inflammation. This cultural shift may also explain disease epidemiology, having turned European-specific adaptive alleles previously targeted by natural selection into disadvantageous ones. METHODS: To explore this evolutionary scenario, we performed ultra-deep sequencing of genes pivotal in the CXCR3-inflammatory pathway on individuals diagnosed for non-celiac wheat sensitivity and we applied anthropological evolutionary genetics methods to sequence data from worldwide populations to investigate the genetic legacy of natural selection on these loci. RESULTS: Our results indicate that balancing selection has maintained two divergent CXCL10/CXCL11 haplotypes in Europeans, one responsible for boosting inflammatory reactions and another for encoding moderate chemokine expression. CONCLUSIONS: This led to considerably higher occurrence of the former haplotype in Western people than in Africans and East Asians, suggesting that they might be more prone to side effects related to the consumption of modern wheat varieties. Accordingly, this study contributed to shed new light on some of the mechanisms potentially involved in the disease etiology and on the evolutionary bases of its present-day epidemiological patterns. Moreover, overrepresentation of disease homozygotes for the dis-adaptive haplotype plausibly accounts for their even more enhanced CXCR3-axis expression and for their further increase in disease risk, representing a promising finding to be validated by larger follow-up studies.

Can supplementation of phytoestrogens/insoluble fibers help the management of duodenal polyps in familial adenomatous polyposis?

Familial adenomatous polyposis (FAP) is an autosomal dominant inherited disorder, and prophylactic colectomy has been shown to decrease the incidence of colorectal cancer (CRC). Duodenal cancer and desmoids are now the leading causes of death in FAP. We evaluate whether 3 months of oral supplementation with a patented blend of phytoestrogens and indigestible insoluble fibers (ADI) help the management of FAP patients with ileal pouch-anal anastomosis (IPAA). In a prospective open label study, we enrolled 15 FAP patients with IPAA and duodenal polyps who underwent upper gastrointestinal endoscopy at baseline and after 3 months of treatment. The primary endpoint was the change in gene expression in polyp mucosa, whereas the secondary endpoint was the reduction in polyp number and size. After 3 months of ADI treatment, all patients showed a reduction in the number and size of duodenal polyps (P = 0.021). Analysis of the expression of CRC promoting/inhibiting genes in duodenal polyps biopsies demonstrated that different CRC-promoting genes (PCNA, MUC1 and COX-2) were significantly downregulated, whereas CRC-inhibiting genes (ER-ß and MUC2) were significantly upregulated after ADI treatment. In conclusion, ADI proved to be safe and effective, and its long-term effects on FAP patients need further investigation. Judging from the results we observed on COX-2 and miR-101 expression, the short-term effects of ADI treatment could be comparable with those obtained using COX-2 inhibitors, with the advantage of being much more tolerable in chronic therapies and void of adverse events.

Dietary Geraniol by Oral or Enema Administration Strongly Reduces Dysbiosis and Systemic Inflammation in Dextran Sulfate Sodium-Treated Mice.

(Trans)-3,7-Dimethyl-2,6-octadien-1-ol, commonly called geraniol (Ge-OH), is an acyclic monoterpene alcohol with well-known anti-inflammatory, antitumoral, and antimicrobial properties. It is widely used as a preservative in the food industry and as an antimicrobial agent in animal farming. The present study investigated the role of Ge-OH as an anti-inflammatory and anti-dysbiotic agent in the dextran sulfate sodium (DSS)-induced colitis mouse model. Ge-OH was orally administered to C57BL/6 mice at daily doses of 30 and 120 mg kg((-1)) body weight, starting 6 days before DSS treatment and ending the day after DSS removal. Furthermore, Ge-OH 120 mg kg((-1)) dose body weight was administered via enema during the acute phase of colitis to facilitate its on-site action. The results show that orally or enema-administered Ge-OH is a powerful antimicrobial agent able to prevent colitis-associated dysbiosis and decrease the inflammatory systemic profile of colitic mice. As a whole, Ge-OH strongly improved the clinical signs of colitis and significantly reduced cyclooxygenase-2 (COX-2) expression in colonocytes and in the gut wall. Ge-OH could be a powerful drug for the treatment of intestinal inflammation and dysbiosis.

Fungal Dysbiosis in Mucosa-associated Microbiota of Crohn's Disease Patients.

BACKGROUND AND AIMS: Gut microbiota is involved in many physiological functions and its imbalance is associated with several diseases, particularly with inflammatory bowel diseases. Mucosa-associated microbiota could have a key role in induction of host immunity and in inflammatory process. Although the role of fungi has been suggested in inflammatory disease pathogenesis, the fungal microbiota has not yet been deeply explored. Here we analysed the bacterial and fungal composition of the mucosa-associated microbiota of Crohn's disease patients and healthy subjects. METHODS: Our prospective, observational study evaluated bacterial and fungal composition of mucosa-associated microbiota of 23 Crohn's disease patients [16 in flare, 7 in remission] and 10 healthy subjects, using 16S [MiSeq] and ITS2 [pyrosequencing] sequencing, respectively. Global fungal load was assessed by real time quantitative polymerase chain reaction. RESULTS: Bacterial microbiota in Crohn's disease patients was characterised by a restriction in biodiversity. with an increase of Proteobacteria and Fusobacteria. Global fungus load was significantly increased in Crohn's disease flare compared with healthy subjects [p < 0.05]. In both groups, the colonic mucosa-associated fungal microbiota was dominated by Basidiomycota and Ascomycota phyla. Cystofilobasidiaceae family and Candida glabrata species were overrepresented in Crohn's disease. Saccharomyces cerevisiae and Filobasidium uniguttulatum species were associated with non-inflamed mucosa, whereas Xylariales order was associated with inflamed mucosa. CONCLUSIONS: Our study confirms the alteration of the bacterial microbiota and is the first demonstration of the existence of an altered fungal microbiota in Crohn's disease patients, suggesting that fungi may play a role in pathogenesis.

Sporadic small bowel tumors detected by capsule endoscopy in patients with occult gastrointestinal bleeding.

Intestinal tumors represent less than 6% of digestive tumors, and, because of the limitations of intestinal investigations, these tumors are difficult to diagnose. In this context, capsule endoscopy has proven effective, especially in patients with obscure digestive bleeding. In a large series of patients undergoing capsule endoscopy, small bowel tumors are found in 2.4-8.9% of cases. The aim of this retrospective, single-center study, based on prospective database, is to evaluate the frequency of small bowel tumors detected by capsule endoscopy in patients with occult gastrointestinal bleeding. During 2004-2014, 849 consecutive patients underwent CE at our Department for occult gastrointestinal bleeding. Following capsule endoscopy, the medical records of the study population were reviewed. Results of double-balloon enteroscopy or surgery performed after capsule endoscopy were retrieved. Capsule endoscopy identified 55 small bowel tumors (6.5%), of which 28 malignancies (51%) and 27 benign neoplasms (49%) underwent surgery or endoscopic treatment. Malignancies included adenocarcinoma (18.7%), gastrointestinal stromal tumors (GIST) (12%) and lymphoma (6.7%). Benign neoplasms included dysplastic adenomatous polyps (36%) and hyperplastic polyps (25.3%). Non-neoplastic masses included one inflammatory polyp. Capsule retention occurred in four patients (5.3%) and the retained capsule was retrieved during surgery. In our experience neoplasms of small bowel are found in 6.5% of patients with occult gastrointestinal bleeding. Of these malignancies, small bowel neoplasms are found in 3.3% of cases. Capsule endoscopy is an effective and sensitive diagnostic tool, and plays an important role in the algorithm for the diagnostic workup of suspected small bowel tumors.

Responses of peripheral blood mononucleated cells from non-celiac gluten sensitive patients to various cereal sources.

Non-celiac gluten sensitivity (NCGS) is still an undefined syndrome whose triggering mechanisms remain unsettled. This study aimed to clarify how cultured peripheral blood mononucleated cells (PBMC) obtained from NCGS patients responded to contact with wheat proteins. Results demonstrated that wheat protein induced an overactivation of the proinflammatory chemokine CXCL10 in PBMC from NCGS patients, and that the overactivation level depends on the cereal source from which proteins are obtained. CXCL10 is able to decrease the transepithelial resistance of monolayers of normal colonocytes (NCM 460) by diminishing the mRNA expression of cadherin-1 (CDH1) and tight junction protein 2 (TJP2), two primary components of the tight junction strands. Thus, CXCL10 overactivation is one of the mechanisms triggered by wheat proteins in PBMC obtained from NCGS patients. This mechanism is activated to a greater extent by proteins from modern with respect to those extracted from ancient wheat genotypes.

Absence of change in the gray matter volume of patients with ulcerative colitis in remission: a voxel based morphometry study.

BACKGROUND: Recent neuroimaging studies have investigated the brain involvement in patients with Crohn's disease (CD) and Ulcerative Colitis (UC). Functional studies found abnormalities in cognitive and emotional functions in CD and UC, while a voxel based morphometry (VBM) study found morphological changes in CD. We conducted a VBM study to compare the gray matter (GM) volume of UC patients and controls. METHODS: Eighteen UC patients in remission and eighteen healthy controls underwent structural MRI. VBM is a fully automated technique allowing identification of regional differences in the amount of GM, which enables an objective analysis of the whole brain. VBM was used for comparisons between patients and controls. RESULTS: UC patients were all in remission and had a mild clinical course. There were no differences between patients and controls in GM volume. CONCLUSION: The brain morphology of patients with UC in remission is similar to controls. The lack of GM abnormalities in UC patients might reflect the mild clinical course of the inflammatory bowel disorder. Further research involving patients with different degrees of disease severity or during flares could shed more light on potential brain structural changes in UC.

Attachment and quality of life in patients with inflammatory bowel disease.

PURPOSE: Inflammatory bowel diseases (IBD) are chronic disorders affecting psychological well-being, quality of life (QOL), social interactions, and close interpersonal relationships of patients affected. The attachment theory provides a theoretical framework to evaluate the quality of close interpersonal relationships in the context of chronic disorders. The aims of this study were to compare the attachment dimensions between IBD patients and healthy controls and to evaluate the impact of these dimensions on QOL in IBD patients. METHODS: One hundred three consecutive IBD outpatients (70 with Crohn's disease and 33 with ulcerative colitis) were recruited in the IBD Unit of the University of Bologna. They were clinically evaluated and filled out the questionnaire Short Form health survey-36 (SF-36), assessing QOL, and the attachment style questionnaire (ASQ), assessing attachment dimensions. One hundred three matched healthy subjects filled out the same questionnaires and represented the control group. RESULTS: IBD patients exhibited worst scores in the QOL measures (both physical and mental health) and in the attachment dimensions Relationships as secondary and Preoccupation with relationships. In IBD, the significant predictors of physical health were disease activity and disease type, while the significant predictors of mental health were disease activity and type, surgery, and the attachment dimensions Confidence and Preoccupation with relationships. CONCLUSIONS: Compared to controls, in IBD patients, the close interpersonal relationships are characterized by attachment insecurity that, in turn, is a significant predictor of QOL. These findings suggest plausible insights for psychological interventions in IBD patients with deterioration in QOL.

Longitudinal analysis of inflammation and microbiota dynamics in a model of mild chronic dextran sulfate sodium-induced colitis in mice.

AIM: To characterize longitudinally the inflammation and the gut microbiota dynamics in a mouse model of dextran sulfate sodium (DSS)-induced colitis. METHODS: In animal models, the most common method used to trigger colitis is based on the oral administration of the sulfated polysaccharides DSS. The murine DSS colitis model has been widely adopted to induce severe acute, chronic or semi-chronic colitis, and has been validated as an important model for the translation of mice data to human inflammatory bowel disease (IBD). However, it is now clear that models characterized by mild intestinal damage are more accurate for studying the effects of therapeutic agents. For this reason, we have developed a murine model of mild colitis to study longitudinally the inflammation and microbiota dynamics during the intestinal repair processes, and to obtain data suitable to support the recovery of gut microbiota-host homeostasis. RESULTS: All plasma cytokines evaluated, except IL-17, began to increase (P < 0.05), after 7 d of DSS administration. IL-17 only began to increase 4 d after DSS withdrawal. IL-1ß and IL-17 continue to increase during the recovery phase, even when clinical signs of colitis had disappeared. IL-6, IL-10 and IFN-γ reached their maxima 4 d after DSS withdrawal and decreased during the late recovery phase. TNFα reached a peak (a three- fold increase, P < 0.05), after which it slightly decreased, only to increase again close to the end of the recovery phase. DSS administration induced profound and rapid changes in the mice gut microbiota. After 3 d of DSS administration, we observed a major reduction in Bacteroidetes/Prevotella and a corresponding increase in Bacillaceae, with respect to control mice. In particular, Bacteroidetes/Prevotella decreased from a relative abundance of 59.42%-33.05%, while Bacillaceae showed a concomitant increase from 2.77% to 10.52%. Gut microbiota rapidly shifted toward a healthy profile during the recovery phase and returned normal 4 d after DSS withdrawal. Cyclooxygenase 2 expression started to increase 4 d after DSS withdrawal (P < 0.05), when dysbiosis had recovered, and continued to increase during the recovery phase. Taken together, these data indicated that a chronic phase of intestinal inflammation, characterized by the absence of dysbiosis, could be obtained in mice using a single DSS cycle. CONCLUSION: Dysbiosis contributes to the local and systemic inflammation that occurs in the DSS model of colitis; however, chronic bowel inflammation is maintained even after recovery from dysbiosis.