Intestinal failure-associated liver disease in adult patients

Teduglutide improves liver chemistries in short bowel syndrome-associated intestinal failure: Post hoc analysis

BACKGROUND

Chronic hepatic complications are common in patients with short bowel syndrome-associated intestinal failure (SBS-IF). Teduglutide, a glucagon-like peptide-2 analogue, demonstrated efficacy in reducing parenteral nutrition and/or intravenous fluid dependence among patients with SBS-IF in phase 3 clinical studies.

METHODS

This was a post hoc analysis of pooled data from two separate randomized, double-blind, placebo-controlled, multinational phase 3 clinical studies. Adult patients with SBS-IF with parenteral nutrition and/or intravenous fluid dependence without liver disease at baseline were randomized to treatment with the glucagon-like peptide-2 analogue teduglutide (0.05 or 0.10 mg/kg/day) or placebo subcutaneously once daily for 24 weeks. Mixed-effects models assessed the baseline predictors of change in liver chemistries.

RESULTS

Between baseline and week 24, teduglutide treatment (n = 109) was associated with least squares mean reductions in aspartate aminotransferase (-7.51 IU/L; P = 0.014), alanine aminotransferase (-12.15 IU/L; P = 0.002), and bilirubin (-5.03 µmol/L [-0.057 mg/dl]; P < 0.001) compared with that of the placebo (n = 59). These values were independent of reductions in parenteral nutrition and/or intravenous fluid dependence.

CONCLUSION

Teduglutide treatment was associated with reductions in liver chemistries by week 24, which is beneficial for patients with SBS-IF beyond improvements in parenteral nutrition and/or intravenous fluid dependence. Future studies should examine how long-term teduglutide might mitigate the risk of liver disease in patients with SBS-IF.

Survey of healthcare professionals' experiences of care delivery in patients with chronic intestinal failure: ATLAS of Variance

BACKGROUND AND AIM

Chronic intestinal failure (IF) is a rare but life-altering condition, care delivery of which is complex. The ATLAS Programme was initiated in 2016 to increase disease awareness and address inconsistencies in delivery of care across Europe. We describe the results of a non-interventional study that aimed to explore how adult patients with chronic IF are managed across Europe.

MATERIALS AND METHODS

This mixed-methods, non-interventional, cross-sectional study comprised a desk-based landscape assessment (Phase 1), qualitative interviews (Phase 2), and an online quantitative survey (Phase 3) completed by healthcare professionals (HCPs) involved in the management of adult patients with chronic IF during the period November 2020 to January 2021. Data were collected from 12 European countries. Survey data were anonymised and pooled for analysis at European and country level. Responses were summarised as frequencies, ranks and percentage.

RESULTS

The quantitative survey was carried out on 119 HCPs across an estimated 58 centres. Gastroenterology was the most frequent specialty of respondents (45%). Three-quarters of HCPs (N = 119) reported that their department/unit had a multidisciplinary team for the management of patients with chronic IF. HCPs reported improving quality of life (QoL) to be the most important goal of treatment (39%), followed by reducing mortality (25%), intestinal rehabilitation (20%) and reducing morbidity (9%). Similarly, 63% of HCPs responded that improved QoL was the most important treatment goal from the perspective of their patients. Overall, 87% of HCPs reported that patients with chronic IF routinely receive home parenteral nutrition (HPN) in their country, which was more common in Western versus Eastern Europe. Meeting treatment goals (53%) and achieving better levels of support with HPN (44%) were reported as the main challenges faced by HCPs in the management of patients with chronic IF. A general lack of disease awareness of chronic IF among HCPs (46%), and insufficient accredited patient referral centres (41%) were considered the most important areas for improvement.

CONCLUSIONS

HCPs specialising in treating chronic IF considered that improvement in QoL is needed for their patients. They reported a low level of awareness of chronic IF among non-specialist HCPs.

Down regulation of NDUFS1 is involved in the progression of parenteral-nutrition-associated liver disease by increasing Oxidative stress

Parenteral nutrition (PN)-associated liver disease (PNALD) is a common and life-threatening complication of patients receiving PN. However, its definitive pathology remains unclear. Ubiquinone oxidoreductase core subunit S1 (NDUFS1), which is the largest core subunit of mitochondrial complex I, could alter the mitochondrial reactive oxygen species (ROS) formation. The purpose of this study was to investigate the role of NDUFS1 in the pathogenesis of PNALD and its underlying mechanism. We performed hepatic proteomics analysis of PNALD patients, and established a PNALD rat model to verify the role of oxidative stress, NDUFS1, pyrin inflammasome, and IL-1β in the progression of PNALD. Proteomics analysis revealed the NDUFS1 expression was decreased in PNALD patients, and the differentially espressed proteins were involved in mitochondrial respiratory chain complex Ⅰ. Treatment with MitoQ or overexpression of NDUFS1 can alleviate the progression of PNALD by reducing oxidative stress. The expression of pyrin, caspase-1, and IL-1β was increased in PN rats. Pharmacological antagonism of pyrin by colchicine can alleviate liver injury and hepatic steatosis. NDUFS1 prevents PNALD pathogenesis by regulating oxidative stress. Pyrin inflammasome and IL-1β may participate in the process of PNALD development by suppressing the transcription of MTTP and impairing the secretion of VLDL. Oxidative stress reduction may be employed as a strategy in the prevention and treatment of PNALD.

Impact of intravenous fish oil on omega-3 fatty acids and their derived lipid metabolites in patients with parenteral nutrition

BACKGROUND

Long-term parenteral nutrition (PN) can lead to intestinal failure-associated liver disease (IFALD). Omega-3 (n-3) polyunsaturated fatty acids (PUFAs) eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were shown to prevent IFALD. EPA-derived and DHA-derived oxylipins could contribute to this protective effect.

METHODS

We analyzed the effect of parenteral fish oil on oxylipins in patients with chronic intestinal failure receiving PN (n = 8). Patients first received no fish oil for 8 weeks and then switched to PN with 25% of fat as fish oil for another 8 weeks. Fatty acid profiles of red blood cells, PUFA-derived oxylipins generated by cyclooxygenase, lipoxygenase (LOX), and cytochrome P450 (CYP) pathways, inflammatory markers, and liver function were assessed before and during fish-oil PN.

RESULTS

EPA plus DHA in erythrocytes (the Omega-3 Index) was high with a median of 11.96% at baseline and decreased to 9.57% without fish oil in PN. Addition of fish oil in PN increased the median Omega-3-Index to 12.75%. EPA-derived and DHA-derived CYP-dependent and LOX-dependent metabolites increased significantly with fish oil in PN, with less pronounced changes in arachidonic acid and its oxylipins. There were no significant changes of inflammation and liver function parameters.

CONCLUSIONS

This study shows that fish oil-containing PN leads to primarily CYP- and LOX-dependent n-3 PUFA-derived inflammation-dampening oxylipins arising from EPA and DHA. Within this short (16-week) study, there were no significant changes in inflammation and clinical readout parameters.

The experience and outcomes of multidisciplinary clinical pharmacist-led parenteral nutrition service for individuals with intestinal failure in a center without home parenteral nutrition

BACKGROUND/OBJECTIVES

Intestinal Failure (IF) is a rare but serious form of organ failure, and patients with IF are dependent on Total Parenteral Nutrition (TPN) to maintain growth and development. This study aimed to describe the experiences of a multidisciplinary clinical pharmacist-led TPN service in the Intestinal Rehabilitation Unit of Shiraz Organ Transplant Center.

SUBJECTS/METHODS

This prospective study was conducted in Shiraz Organ Transplant Center, Iran from February 2018 to October 2020, including seven months with and 24 months without the clinical pharmacist involvement. Clinical and nutritional outcomes as well as the potential complications of TPN were compared in these two periods.

RESULTS

This study was conducted on 107 patients. The most important complication occurred among the patients receiving TPN were catheter infection (42.05%), sepsis, and catheter thrombosis (18.69%). Portal vein thrombosis (OR = 26.56) and length of Intensive Care Unit (ICU) stay (OR = 1.12) were significantly associated with the rate of parenteral nutrition-associated liver disease. The results also revealed an association between the rate of sepsis and history of malignancy, catheter thrombosis, length of the small bowel, length of PN, length of hospital stay, and length of ICU stay. Moreover, the results showed a significant difference regarding the patients' outcomes and TPN complications before and after the clinical pharmacist interventions (P < 0.05).

CONCLUSION

Working as a multidisciplinary team in Intestinal Rehabilitation Unit (IRU) has been suggested to improve patients' outcomes and reduce mortality and morbidity. Presence of a clinical pharmacist in this team can help improve the TPN service provided for individuals with IF.

[Short bowel syndrome: From intestinal insufficiency to intestinal adaptation]

The short bowel syndrome results from an extensive intestinal resection. When intestinal function is below the minimum necessary for the absorption of macronutrients, water and electrolytes, short small bowel syndrome is responsible for chronic intestinal failure. The management is then parenteral nutrition. The evolution of the short bowel syndrome is schematically divided into three successive periods: (a) Immediate postoperative period lasting 3 to 6 weeks; (b) adaptive period lasting about 2 years and (c) stabilization period. However, the development of hyperphagia, spontaneous intestinal adaptation allowing an increase in the absorption surface area and in secretion of enterohormones and a modification of the microbiota occur spontaneously, improving intestinal absorption and decreasing dependence on parenteral nutrition. This review summarizes the main positive and negative pathophysiological consequences of extensive intestinal resection and the nutritional and drug management of short bowel syndrome in adults.

Chronic intestinal failure and short bowel syndrome in Crohn’s disease

Chronic intestinal failure (CIF) is a rare but feared complication of Crohn’s disease. Depending on the remaining length of the small intestine, the affected intestinal segment, and the residual bowel function, CIF can result in a wide spectrum of symptoms, from single micronutrient malabsorption to complete intestinal failure. Management of CIF has improved significantly in recent years. Advances in home-based parenteral nutrition, in particular, have translated into increased survival and improved quality of life. Nevertheless, 60% of patients are permanently reliant on parenteral nutrition. Encouraging results with new drugs such as teduglutide have added a new dimension to CIF therapy. The outcomes of patients with CIF could be greatly improved by more effective prevention, understanding, and treatment. In complex cases, the care of patients with CIF requires a multidisciplinary approach involving not only physicians but also dietitians and nurses to provide optimal intestinal rehabilitation, nutritional support, and an improved quality of life. Here, we summarize current literature on CIF and short bowel syndrome, encompassing epidemiology, pathophysiology, and advances in surgical and medical management, and elucidate advances in the understanding and therapy of CIF-related complications such as catheter-related bloodstream infections and intestinal failure-associated liver disease.

Differential Metabolomic Analysis of Liver Tissues from Rat Models of Parenteral Nutrition-Associated Liver Disease

Parenteral nutrition (PN) is a life-saving therapy for patients with intestinal failure, but parenteral nutrition-associated liver disease (PNALD) limits its long-term use. The present study is aimed at determining which pathways are altered most notably in a rat model of PNALD. We randomly assigned male Sprague-Dawley (SD) rats into two different groups, whereby they received either enteral nutrition (EN) or PN. Liver tissues were harvested from all rats 7 days later for metabolomic profiling. The composition of primary conjugated bile acids was altered, the synthesis of polyunsaturated fatty acids was reduced, the conversion of pyruvate to acetyl-CoA was blocked, and the synthesis of phosphatidylcholine was inhibited in rats with PNALD. Riboflavin, which is involved in the electron transfer process in the mitochondrial electron transport chain, was remarkably decreased in PNALD rats. A deficiency of polyunsaturated fatty acids, riboflavin, choline, and taurine might be involved in the progression of PNALD. The implications of these findings for the field of medicine are that supplementation with polyunsaturated fatty acids, riboflavin, choline, and taurine might have potential as therapeutic strategies for PNALD and also shed light on the mechanisms of PNALD.