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Exocrine pancreas

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https://www.readbyqxmd.com/read/29330353/afadin-and-rhoa-control-pancreatic-endocrine-mass-via-lumen-morphogenesis
#1
D Berfin Azizoglu, Caitlin Braitsch, Denise K Marciano, Ondine Cleaver
Proper lumen morphogenesis during pancreas development is critical to endocrine and exocrine cell fate. Recent studies showed that a central network of lumens (termed core), but not the surrounding terminal branches (termed periphery), produces most islet endocrine cells. To date, it remains unclear how pancreatic lumens form and remodel and which aspects of lumen morphogenesis influence cell fate. Importantly, models testing the function of the central lumen network as an endocrine niche are lacking. Here, we identify mechanisms underlying lumen formation and remodeling and show that central lumen network morphogenesis impacts pancreatic endocrine mass...
January 12, 2018: Genes & Development
https://www.readbyqxmd.com/read/29329912/identification-and-fate-mapping-of-the-pancreatic-mesenchyme
#2
Jesse Angelo, Kimberly D Tremblay
The murine pancreas buds from the ventral embryonic endoderm at approximately 8.75 dpc and a second pancreas bud emerges from the dorsal endoderm by 9.0 dpc. Although it is clear that secreted signals from adjacent mesoderm-derived sources are required for both the appropriate emergence and further refinement of the pancreatic endoderm, neither the exact signals nor the requisite tissue sources have been defined in mammalian systems. Herein we use DiI fate mapping of cultured murine embryos to identify the embryonic sources of both the early inductive and later condensed pancreatic mesenchyme...
January 9, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29329320/atypical-e2f-functions-are-critical-for-pancreas-polyploidization
#3
Ramadhan B Matondo, Eva Moreno, Mathilda J M Toussaint, Peter C J Tooten, Saskia C van Essen, Elsbeth A van Liere, Sameh A Youssef, Laura Bongiovanni, Alain de Bruin
The presence of polyploid cells in the endocrine and exocrine pancreas has been reported for four decades. In rodents, pancreatic polyploidization is initiated after weaning and the number of polyploid cells increases with age. Surprisingly the molecular regulators and biological functions of polyploidization in the pancreas are still unknown. We discovered that atypical E2f activity is essential for polyploidization in the pancreas, using an inducible Cre/LoxP approach in new-born mice to delete ubiquitously the atypical E2f transcription factors, E2f7 and E2f8...
2018: PloS One
https://www.readbyqxmd.com/read/29325720/development-of-pancreatic-machine-perfusion-translational-steps-from-porcine-to-human-models
#4
Karim Hamaoui, Sally Gowers, Bynvant Sandhu, Natalie Vallant, Terry Cook, Martyn Boutelle, Daniel Casanova, Vassilios Papalois
BACKGROUND: Hypothermic machine perfusion (HMP) is increasingly being used for extended criteria kidney grafts. Pancreatic HMP is challenging because physiologically the pancreas is a low-flow organ susceptible to edema. We report the successful development of preclinical HMP models using porcine pancreases, as well as human pancreases unsuitable for clinical transplantation. METHODS: Ten porcine pancreases were used in the development of these perfusion models...
January 8, 2018: Journal of Surgical Research
https://www.readbyqxmd.com/read/29317564/pdx1-gene-mutation-with-permanent-neonatal-diabetes-mellitus-with-annular-pancreas-duodenal-atresia-hypoplastic-gall-bladder-and-exocrine-pancreatic-insufficiency
#5
Abhishek Kulkarni, Varun K Sharma, Fazal Nabi
BACKGROUND: Neonatal diabetes mellitus is a rare condition. CASE CHARACTERISTICS: A small for gestational age male, presented with neonatal onset diabetes mellitus, duodenal atresia, annular pancreas and gall bladder hypoplasia. OBSERVATION: Observation: A novel homozygous mutation p.K163R (c.488A>G) in the PDX1 gene was found. Parents were heterozygous for the same. MESSAGE: This case highlights the importance of establishing the genetic diagnosis in all cases of neonatal diabetes mellitus...
December 15, 2017: Indian Pediatrics
https://www.readbyqxmd.com/read/29302507/blunt-trauma-pancreas-in-children-is-non-operative-management-appropriate-for-all-grades
#6
Ravi Kumar Garg, Jai Kumar Mahajan
Purpose: Blunt trauma of pancreas in children is uncommon and its management varies from observational to early operative intervention. We analysed the feasibility and outcome of non-operative management in all grades of paediatric pancreatic injuries. Methods: A total of 15 patients of pancreatic trauma seen in a Paediatric Surgery Unit were retrospectively analyzed. Results: Age of the patients ranged from 3-11 years (mean, 7.7 years). The mode of injury was local trauma in 9 children...
December 2017: Pediatric Gastroenterology, Hepatology & Nutrition
https://www.readbyqxmd.com/read/29302047/functional-and-association-analysis-of-an-amerindian-derived-population-specific-p-thr280met-variant-in-rbpjl-a-component-of-the-ptf1-complex
#7
Anup K Nair, Jeff R Sutherland, Michael Traurig, Paolo Piaggi, Peng Chen, Sayuko Kobes, Robert L Hanson, Clifton Bogardus, Leslie J Baier
PTF1 complex is critical for pancreatic development and maintenance of adult exocrine pancreas. As a part of our ongoing studies to identify genetic variation that contributes to type 2 diabetes (T2D) in American Indians, we analyzed variation in genes that form this complex, namely PTF1A, RBPJ, and its paralogue RBPJL. A c.839C>T (p.(Thr280Met)) variant (rs200998587:C>T, risk allele frequency = 0.03) in RBPJL, identified only in Amerindian-derived populations, associated with T2D (OR = 1.60[1...
January 4, 2018: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/29299757/benign-tumors-of-the-pancreas-radical-surgery-versus-parenchyma-sparing-local-resection-the-challenge-facing-surgeons
#8
EDITORIAL
Hans G Beger
Pancreaticoduodenectomy and left-sided pancreatectomy are the surgical treatment standards for tumors of the pancreas. Surgeons, who are requested to treat patients with benign tumors, using standard oncological resections, face the challenge of sacrificing pancreatic and extra-pancreatic tissue. Tumor enucleation, pancreatic middle segment resection and local, duodenum-preserving pancreatic head resections are surgical procedures increasingly used as alternative treatment modalities compared to classical pancreatic resections...
January 3, 2018: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/29290589/ccpg1-is-a-non-canonical-autophagy-cargo-receptor-essential-for-er-phagy-and-pancreatic-er-proteostasis
#9
Matthew D Smith, Margaret E Harley, Alain J Kemp, Jimi Wills, Martin Lee, Mark Arends, Alex von Kriegsheim, Christian Behrends, Simon Wilkinson
Mechanisms of selective autophagy of the ER, known as ER-phagy, require molecular delineation, particularly in vivo. It is unclear how these events control ER proteostasis and cellular health. Here, we identify cell-cycle progression gene 1 (CCPG1), an ER-resident protein with no known physiological role, as a non-canonical cargo receptor that directly binds to core autophagy proteins via an LIR motif to mammalian ATG8 proteins and, independently and via a discrete motif, to FIP200. These interactions facilitate ER-phagy...
December 27, 2017: Developmental Cell
https://www.readbyqxmd.com/read/29289464/kinetics-of-pancreatic-tissue-proliferation-in-a-polymeric-platform-in-mice
#10
Luciana Xavier Pereira, Celso Tarso Rodrigues Viana, Laura Alejandra Ariza Orellano, Simone Aparecida de Almeida, Marcela Guimarães Takahashi de Lazari, Letícia Chinait Couto, Anilton Cesar Vasconcelos, Silvia Passos Andrade, Paula Peixoto Campos
BACKGROUND/OBJECTIVES: Pancreas regenerative capacity after injury is not always sufficient to comply with the body's requirement of digestive enzymes and hormones. We present an alternative system to induce pancreas parenchyma proliferation (exocrine and endocrine components), rather than regeneration or remodeling in normoglycemic mice. METHODS: Porous discs of polyether-polyurethane were surgically placed adjacent to the native pancreas and removed at days 15, 30 and 45 after implantation...
December 21, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/29288273/pro-inflammatory-cytokines-after-an-episode-of-acute-pancreatitis-associations-with-fasting-gut-hormone-profile
#11
Sayali A Pendharkar, Ruma G Singh, Shayal K Chand, Aya Cervantes, Maxim S Petrov
INTRODUCTION: Pro-inflammatory cytokines, such as interleukin (IL)-6, tumour necrosis factor (TNF)α, and monocyte chemoattractant protein (MCP)-1, are often elevated in individuals after acute pancreatitis but what determines their levels is poorly understood. Gut hormones have emerged as possible modulators of inflammatory response. The aim was to investigate the associations between pro-inflammatory cytokines and a comprehensive panel of gut hormones after an episode of acute pancreatitis...
December 29, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/29281757/short-term-outcomes-and-risk-factors-for-pancreatic-fistula-after-pancreatic-enucleation-a-single-center-experience-of-142-patients
#12
Xing Wang, Chun-Lu Tan, Hao Zhang, Yong-Hua Chen, Min Yang, Neng-Wen Ke, Xu-Bao Liu
BACKGROUND: Enucleation is increasingly used for benign or low-grade pancreatic neoplasms. Enucleation preserves the pancreatic parenchyma as well as decreases the risk of long-term endocrine and exocrine dysfunction, but may be associated with a higher rate of postoperative pancreatic fistula (POPF). The aim of this study was to assess short-term outcomes, in particular, POPF. METHODS: Data were collected retrospectively from all 142 patients who underwent pancreatic enucleation between 2009 and 2014 in our institution were analyzed...
December 27, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29277029/embryonic-exposure-to-mono-2-ethylhexyl-phthalate-mehp-disrupts-pancreatic-organogenesis-in-zebrafish-danio-rerio
#13
Haydee M Jacobs, Karilyn E Sant, Aviraj Basnet, Larissa M Williams, Jennifer B Moss, Alicia R Timme-Laragy
Mono(2-ethylhexyl) phthalate (MEHP) is the bioactive metabolite of di(2-ethylhexyl) phthalate, a plasticizing agent and persistent environmental contaminant associated with obesity, developmental abnormalities, and oxidative stress. Nrf2 (Nfe2l2) is a transcription factor that regulates cytoprotective genes as part of the adaptive antioxidant response. We previously identified the pancreas as a sensitive target of oxidative stress during embryonic development. The goals of this study were to 1) characterize the effects of MEHP exposure on pancreatic development, and 2) determine whether oxidative stress contributes to MEHP embryotoxicity...
December 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29248457/malnutrition-in-pancreatic-ductal-adenocarcinoma-pda-dietary-pancreatic-enzymes-improve-short-term-health-but-stimulate-tumor-growth
#14
Yalda Zolghadri, Shreoshi Pal Choudhuri, Ozhan Ocal, Somayeh Layeghi- Ghalehsoukhteh, Feaven Berhe, Michael A Hale, Thomas M Wilkie
Pancreatic ductal adenocarcinoma (PDA) is a deadly cancer that resists efforts to identify better chemotherapeutics. PDA is associated with chronic pancreatitis and acinar cell dedifferentiation. This reduces enzyme production by the exocrine pancreas, resulting in digestive insufficiencies. Malabsorption of partially digested food can cause bloating, overfilled intestines, abdominal pain, excessive feces, steatorrhea, and malnutrition. These maladies affect quality of life and restrict treatment options for pancreatitis and PDA...
December 14, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29235373/pro-inflammatory-cytokine-induced-lipolysis-after-an-episode-of-acute-pancreatitis
#15
Sayali A Pendharkar, Ruma G Singh, Maxim S Petrov
CONTEXT: Pro-inflammatory cytokine-stimulated lipolysis is one of the mechanisms underlying the pathogenesis of type 2 diabetes. However, whether it plays a role in the pathogenesis of post-pancreatitis diabetes mellitus (PPDM) remains unknown. OBJECTIVE: To investigate the associations between markers of lipid metabolism and pro-inflammatory cytokines in individuals after acute pancreatitis (AP) in general, and in individuals with abnormal glucose metabolism (AGM) following AP in particular...
December 13, 2017: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/29230485/-importance-of-functional-diagnostics-in-gastroenterology
#16
REVIEW
M Hollenbach, A Hoffmeister, J Rosendahl, J Mössner
In this review article important and frequently used investigation methods for gastrointestinal functional diagnostics are presented. Some other rarely used special investigations are also explained. The hydrogen breath test is simple to carry out, ubiquitously available and enables the detection of lactose, fructose and sorbitol malabsorption. Furthermore, by the application of glucose, the test can be carried out when there is a suspicion of abnormal intestinal bacterial colonization and using lactulose for measuring small intestinal transit time...
December 11, 2017: Der Internist
https://www.readbyqxmd.com/read/29222447/structural-abnormalities-in-islets-from-very-young-children-with-cystic-fibrosis-may-contribute-to-cystic-fibrosis-related-diabetes
#17
Marika Bogdani, Scott M Blackman, Cecilia Ridaura, Jean-Pierre Bellocq, Alvin C Powers, Lydia Aguilar-Bryan
Cystic fibrosis (CF)-related diabetes (CFRD) is thought to result from beta-cell injury due in part to pancreas exocrine damage and lipofibrosis. CFRD pancreata exhibit reduced islet density and altered cellular composition. To investigate a possible etiology, we tested the hypothesis that such changes are present in CF pancreata before the development of lipofibrosis. We evaluated pancreas and islet morphology in tissues from very young CF children (<4 years of age), and adult patients with CF and CFRD...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29221165/angiogenesis-in-adenosquamous-cancer-of-pancreas
#18
Nicola Silvestris, Katia Danza, Vito Longo, Oronzo Brunetti, Livia Fucci, Antonella Argentiero, Angela Calabrese, Ivana Cataldo, Roberto Tamma, Domenico Ribatti, Stefania Tommasi
Adenosquamous carcinoma of the pancreas (ASCP) is an uncommon variant of exocrine pancreatic malignancies, characterized by a histological admixture of adenomatous and squamous cell elements. This cancer is characterized by a poorly differentiated histology and a poorer clinical outcome compared to pancreatic ductal adenocarcinoma (PDAC). Unlike PDAC, that is characterized by a low microvascular density (MVD) and collapsed vasculature, no data are available about angiogenesis in ASPC. Immunohistochemical evaluation of MVD and trypatse-positive mast cells (MCs) were performed on a single case of ASCP compared to PDAC...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29206061/the-clinical-value-of-secretin-enhanced-mrcp-in-the-functional-and-morphological-assessment-of-pancreatic-diseases
#19
Bella Chamokova, Nina Bastati-Huber, Sarah Poetter-Lang, Yesim Bican, Jacqueline Hodge, Martin Schindl, Celso Matos, Ahmed Ba-Ssalamah
Secretin-enhanced MRCP (S-MRCP) provides a non-invasive way with which to evaluate pancreatic duct (PD) anatomy and exocrine pancreatic function. S-MRCP can be added to the routine pancreas MR exam in equivocal cases. Moreover, it can detect subtle PD involvement, allowing diagnosis of early, rather than end-stage, pancreatic diseases. Although S-MRCP is a valuable non-invasive diagnostic method, it is only performed in a few centers due to high cost. Furthermore, less familiarity with its indications, the exam technique, and image interpretation also contribute to its limited use...
December 5, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29201871/calcitonin-gene-related-peptide-neuroendocrine-communication-between-the-pancreas-gut-and-brain-in-regulation-of-blood-glucose
#20
Sayali A Pendharkar, Monika Walia, Marie Drury, Maxim S Petrov
Background: Calcitonin gene-related peptide (CGRP), a ubiquitous neuropeptide, plays a diverse and intricate role in chronic low-grade inflammation, including conditions such as obesity, type 2 diabetes, and diabetes of the exocrine pancreas. Diabetes of exocrine pancreas is characterised by chronic hyperglycemia and is associated with persistent low-grade inflammation and altered secretion of certain pancreatic and gut hormones. While CGRP may regulate glucose homeostasis and the secretion of pancreatic and gut hormones, its role in chronic hyperglycemia after acute pancreatitis (CHAP) is not known...
November 2017: Annals of Translational Medicine
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