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Michael Camilleri

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https://www.readbyqxmd.com/read/29102744/modulating-bile-acid-pathways-and-tgr5-receptors-for-treating-liver-and-gi-diseases
#1
REVIEW
Harmeet Malhi, Michael Camilleri
Bile acids are central signals in enterohepatic communication and also integrate microbiota-derived signals into this signaling axis. Discovery of the tissue distribution and signaling pathways activated by the natural receptors for bile acids, farnesoid X receptor and G protein-coupled bile acid receptor 1 (GPBAR1) also known as TGR5, and bile acid transporters has led to the development of therapeutic agents that target these molecules. Obeticholic acid, a selective FXR agonist, and NGM282, a non-mitogenic FGF-19 analog, are two of the agents in this pipeline...
November 2, 2017: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/29077050/pharmacotherapy-for-irritable-bowel-syndrome
#2
REVIEW
Michael Camilleri, Alexander C Ford
Irritable bowel syndrome (IBS) is a disorder of the brain-gut axis; the pathophysiological mechanisms include altered colonic motility, bile acid metabolism, neurohormonal regulation, immune dysfunction, alterations in the epithelial barrier and secretory properties of the gut. This article reviews the mechanisms, efficacy, and safety of current pharmacotherapy, and medications that are in phase III trials for the treatment of IBS. There remains a significant unmet need for effective treatments-particularly for the pain component of IBS-although the introduction of drugs directed at secretion, motility and a non-absorbable antibiotic provide options for the bowel dysfunction in IBS...
October 27, 2017: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/29061658/the-gastrointestinal-tract-as-an-integrator-of-mechanical-and-hormonal-response-to-nutrient-ingestion
#3
Adrian Vella, Michael Camilleri
Glucose tolerance after meal ingestion in vivo is the result of multiple processes that occur in parallel. Insulin secretion together with reciprocal inhibition of glucagon secretion contributes to glucose tolerance. However, other factors beyond glucose effectiveness and insulin action require consideration. The absorption of ingested nutrients and their subsequent systemic rate of appearance largely depend on the rate of delivery of nutrients to the proximal small intestine. This is determined by the integrated response of the upper gastrointestinal tract to a meal...
November 2017: Diabetes
https://www.readbyqxmd.com/read/29051033/description-of-analytical-method-and-clinical-utility-of-measuring-serum-7-alpha-hydroxy-4-cholesten-3-one-7ac4-by-mass-spectrometry
#4
Leslie J Donato, Alan Lueke, Stacy M Kenyon, Jeffrey W Meeusen, Michael Camilleri
BACKGROUND: Imbalance of bile acids (BA) homeostasis in the gastrointestinal tract can lead to chronic diarrhea or constipation when BA in the colon are in excess or low, respectively. Since both disturbances of bowel function can result from other etiologies, identifying BA imbalance is important to tailor treatment strategies. Serum concentrations of 7-alpha-hydroxy-4-cholesten-3-one (7aC4), a precursor in bile acid synthesis, reflect BA homeostasis. Here we describe a method to accurately measure serum 7aC4 and evaluate the clinical utility in patients with diarrhea or constipation phenotypes...
October 16, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/29038646/medical-therapies-in-the-pipeline-for-irritable-bowel-syndrome
#5
Michael Camilleri
No abstract text is available yet for this article.
September 2017: Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28958851/effects-of-liraglutide-on-weight-satiation-and-gastric-functions-in-obesity-a-randomised-placebo-controlled-pilot-trial
#6
Houssam Halawi, Disha Khemani, Deborah Eckert, Jessica O'Neill, Hoda Kadouh, Karen Grothe, Matthew M Clark, Duane D Burton, Adrian Vella, Andres Acosta, Alan R Zinsmeister, Michael Camilleri
BACKGROUND: Liraglutide, a long-acting GLP-1 receptor agonist, is approved for treatment of obesity; however, the mechanisms of action of liraglutide are incompletely understood. We compared effects of liraglutide versus placebo on gastric motor functions, satiation, satiety, and weight in obese individuals over 16 weeks. METHODS: We did a randomised, double-blind, placebo-controlled pilot trial at a single centre (Mayo Clinic, Rochester, MN, USA). Participants were randomly allocated (1:1) by a computer generated randomisation schedule with no stratification to receive subcutaneous liraglutide (3·0 mg) or placebo, with standardised nutritional and behavioural counselling...
September 25, 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28936110/a-working-paradigm-for-the-treatment-of-obesity-in-gastrointestinal-practice
#7
Andres Acosta, Michael Camilleri
Obesity is a chronic, relapsing, multi-factorial disease characterized by abnormal or excessive adipose tissue accumulation that may impair health and increase disease risks. Despite the ever-increasing prevalence and economic and societal burden, the current approaches to treat obesity are not standardized or generally effective. In this manuscript, we describe a current working paradigm developed by a consensus approach for the multidisciplinary treatment of obesity in the GI practice. Obesity should be managed as a continuum of care focusing on weight loss, weight loss maintenance and prevention of weight regain...
January 2017: Techniques in Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28911951/anniversary-tribute-from-the-editors-of-clinical-gastroenterology-and-hepatology
#8
Michael Camilleri, C Mel Wilcox, Hashem B El-Serag, Fasiha Kanwal
No abstract text is available yet for this article.
September 12, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28899672/large-meckel-s-diverticulum-and-dilated-adjacent-small-intestine-presenting-with-intestinal-obstruction
#9
Kathleen van Malderen, Michael Camilleri
No abstract text is available yet for this article.
September 9, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28895582/gastric-motor-dysfunction-in-patients-with-functional-gastroduodenal-symptoms
#10
Seon-Young Park, Andrés Acosta, Michael Camilleri, Duane Burton, W Scott Harmsen, Jean Fox, Lawrence A Szarka
OBJECTIVES: The pathophysiology of dyspeptic symptoms is complex. The aim of this study was to evaluate the association of gastric emptying (GE), gastric accommodation (GA), and respiratory sinus arrhythmia (RSA, to assess vagal dysfunction) in a large cohort with functional gastroduodenal symptoms. METHODS: We reviewed demographic, clinical features, and results of gastric motor and vagal function studies of 1,287 patients (74.0% females, mean age 43.1±15.4 years) who had undergone both single photon emission computed tomography GA and scintigraphic GE...
November 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28814481/plausibility-criteria-for-putative-pathophysiological-mechanisms-in-functional-gastrointestinal-disorders-a-consensus-of-experts
#11
Jan Tack, Maura Corsetti, Michael Camilleri, Eamonn Mm Quigley, Magnus Simren, Hidekazu Suzuki, Nicholas J Talley, Hans Tornblom, Lukas Van Oudenhove
BACKGROUND AND AIMS: The functional gastrointestinal disorders (FGIDs) are extremely common conditions associated with a considerable personal, social and health economic burden. Managing FGIDs in clinical practice is challenging because of the uncertainty of symptom-based diagnosis, the high frequency of overlap between these conditions and the limited efficacy of available therapies. It has often been argued that successful drug development and management of FGIDs requires knowledge of the underlying pathophysiology...
August 16, 2017: Gut
https://www.readbyqxmd.com/read/28814387/effects-of-nk1-receptors-on-gastric-motor-functions-and-satiation-in-healthy-humans-results-from-a-controlled-trial-with-the-nk1-antagonist-aprepitant
#12
Deepti Jacob, Irene A Busciglio, Duane D Burton, Houssam Halawi, Ibironke Oduyebo, Deborah Rhoten, Michael Ryks, W Scott Harmsen, Michael Camilleri
Aprepitant, an NK1 receptor antagonist, is approved for the treatment of chemotherapy-induced or postoperative emesis by blocking NK1 receptors in the brain stem vomiting center. Effects of NK1 receptors on gastric functions and postprandial symptoms in humans are unclear; a single, crossover study did not show a significant effect of aprepitant on gastrointestinal transit. Our aim was to compare, in a randomized, double-blind, placebo-controlled, parallel-group study (12 healthy volunteers per group), effects of aprepitant vs...
August 16, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28774870/relationship-of-gastric-emptying-or-accommodation-with-satiation-satiety-and-postprandial-symptoms-in-health
#13
Houssam Halawi, Michael Camilleri, Andres Acosta, Maria I Vazquez-Roque, Ibironke Oduyebo, Duane D Burton, Irene A Busciglio, Alan R Zinsmeister
The contributions of gastric emptying (GE) and gastric accommodation (GA) to satiation, satiety, and postprandial symptoms remain unclear. We aimed to evaluate the relationships between GA or GE with satiation, satiety, and postprandial symptoms in healthy overweight or obese volunteers (total n=285, 73% females, mean BMI 33.5kg/m2): 26 prospectively studied obese, otherwise healthy participants and 259 healthy subjects with previous similar GI testing. We assessed GE of solids, gastric volumes, calorie intake at buffet meal, satiation by measuring volume to comfortable fullness (VTF) and maximum tolerated volume (MTV) using Ensure® nutrient drink test (30mL/min), and symptoms 30 minutes after MTV...
August 3, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28760384/efficacy-and-safety-of-relamorelin-in-diabetics-with-symptoms-of-gastroparesis-a-randomized-placebo-controlled-study
#14
Michael Camilleri, Richard W McCallum, Jan Tack, Sharon C Spence, Keith Gottesdiener, Fred T Fiedorek
BACKGROUND & AIMS: Gastroparesis is a complication of diabetes with few treatment options. Relamorelin (also referred to as RM-131) is a selective, prokinetic agonist of ghrelin. We aimed to evaluate the efficacy of relamorelin on symptoms and gastric emptying (GE) in a 12-week, phase 2B study of diabetic patients with moderate to severe gastroparesis symptoms (DG). METHODS: We performed a study of 393 patients with DG (37.7% male; 9.9% with type 1 diabetes; median age, 58...
November 2017: Gastroenterology
https://www.readbyqxmd.com/read/28716436/frontal-fibrosing-alopecia-among-men-a%C3%A2-clinicopathologic-study-of-7-cases
#15
Stanislav N Tolkachjov, Hafsa M Chaudhry, Michael J Camilleri, Rochelle R Torgerson
BACKGROUND: Frontal fibrosing alopecia (FFA) is a lichen planopilaris-variant scarring alopecia that has rarely been described in men. OBJECTIVE: To characterize the clinicopathologic findings of FFA in men by studying a series of 7 male patients. METHODS: We conducted a retrospective review of all cases of male patients with FFA at the Mayo Clinic from 1992 to 2016. RESULTS: Seven male patients with FFA were identified...
October 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28686075/pharmacogenetics-and-the-treatment-of-functional-gastrointestinal-disorders
#16
Houssam Halawi, Michael Camilleri
The diagnosis and management of functional gastrointestinal disorders (FGIDs) remain very challenging. In the era of precision medicine, it is important to individualize the treatment of these conditions by providing targeted and effective therapies while minimizing the risk of medication side effects. By using genetic information that predicts and affects the responses to specific medications, it is anticipated that the science of pharmacogenetics in FGIDs will advance the practice of precision medicine. The pathophysiology of FGIDs is complex, involving the interaction between predisposing genetic and environmental factors...
July 2017: Pharmacogenomics
https://www.readbyqxmd.com/read/28666948/bile-acid-deficiency-in-a-subgroup-of-patients-with-irritable-bowel-syndrome-with-constipation-based-on-biomarkers-in-serum-and-fecal-samples
#17
Priya Vijayvargiya, Irene Busciglio, Duane Burton, Leslie Donato, Alan Lueke, Michael Camilleri
BACKGROUND & AIMS: Short-term administration of delayed-release chenodeoxycholic acid to patients with irritable bowel syndrome with constipation (IBS-C) accelerates colonic transit and reduces symptoms. A preliminary study has shown that patients with IBS-C have reduced levels of bile acids (BAs) in feces and reduced synthesis of BA. We compared the levels of primary and secondary BAs in fecal samples collected over a 48-hour period from patients with IBS-C on a diet that contained 100 g fat per day, and compared them with levels in samples from healthy volunteers (controls)...
June 27, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28583824/a-selection-of-best-aga-abstracts-of-ddw-2017
#18
Michael Camilleri
No abstract text is available yet for this article.
June 2, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28529168/opioids-in-gastroenterology-treating-adverse-effects-and-creating-therapeutic-benefits
#19
Michael Camilleri, Anthony Lembo, David A Katzka
The use of opioid medications on both an acute and chronic basis is ubiquitous in the United States. As opioid receptors densely populate the gastrointestinal tract, symptoms and side effects can be expected in these patients. In the esophagus, dysmotility may result, manifesting with dysphagia and a syndrome indistinguishable from primary achalasia. In the stomach, a marked delay in gastric emptying may occur with postprandial nausea and early satiety. Postoperatively, particularly with abdominal surgery, opioid-induced ileus may ensue...
September 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28500061/abdominal-electroacupuncture-demonstrates-an-increase-in-complete-spontaneous-bowel-movements
#20
Deepti Jacob, Priya Vijayvargiya, Michael Camilleri
No abstract text is available yet for this article.
May 12, 2017: Evidence-based Medicine
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