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https://www.readbyqxmd.com/read/28733893/effects-of-new-generation-tmem16a-inhibitors-on-calcium-activated-chloride-currents-in-rabbit-urethral-interstitial-cells-of-cajal
#1
Stephen Fedigan, Eamonn Bradley, Timothy Webb, Roddy J Large, Mark A Hollywood, Keith D Thornbury, Noel G McHale, Gerard P Sergeant
Interstitial cells of Cajal (ICC) isolated from the rabbit urethra exhibit Ca(2+)-activated Cl(-) currents (I ClCa) that are important for the development of urethral tone. Here, we examined if TMEM16A (ANO1) contributed to this activity by examining the effect of "new-generation" TMEM16A inhibitors, CACCinh-A01 and T16Ainh-A01, on I ClCa recorded from freshly isolated rabbit urethral ICC (RUICC) and on contractions of intact strips of rabbit urethra smooth muscle. Real-time quantitative PCR experiments demonstrated that TMEM16A was highly expressed in rabbit urethra smooth muscle, in comparison to TMEM16B and TMEM16F...
July 21, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28728818/mechanosensitive-piezo-channels-in-the-gastrointestinal-tract
#2
C Alcaino, G Farrugia, A Beyder
Sensation of mechanical forces is critical for normal function of the gastrointestinal (GI) tract and abnormalities in mechanosensation are linked to GI pathologies. In the GI tract there are several mechanosensitive cell types-epithelial enterochromaffin cells, intrinsic and extrinsic enteric neurons, smooth muscle cells and interstitial cells of Cajal. These cells use mechanosensitive ion channels that respond to mechanical forces by altering transmembrane ionic currents in a process called mechanoelectrical coupling...
2017: Current Topics in Membranes
https://www.readbyqxmd.com/read/28727940/intestinal-transit-time-and-cortisol-mediated-stress-in-zebrafish
#3
Clayton Brady, Maxwell Denora, Ian Shannon, Karl J Clark, Adam Rich
Intestinal motility, the spontaneous and rhythmic smooth muscle contraction, is a complex process that is regulated by overlapping and redundant regulatory mechanisms. Primary regulators intrinsic to the gastrointestinal tract include interstitial cells of Cajal, enteric neurons, and smooth muscle cells. Extrinsic primary regulators include the autonomic nervous system, immune system, and the endocrine system. Due to this complexity, a reductionist approach may be inappropriate if the ultimate goal is to understand motility regulation in vivo...
July 20, 2017: Zebrafish
https://www.readbyqxmd.com/read/28726276/the-colonic-groove-of-the-plains-viscacha-lagostomus-maximus-histochemical-evidence-of-an-abrupt-change-in-the-glycosylation-pattern-of-goblet-cells
#4
María Florencia Tano de la Hoz, Mirta Alicia Flamini, Carolina Natalia Zanuzzi, Alcira Ofelia Díaz
The ascending colon of most rodent species shows a longitudinal colonic groove that works as a retrograde transport pathway for a mixture of bacteria and mucus toward the cecum. We describe the morphology and glycosylation pattern of the colonic groove of Lagostomus maximus to analyze the role of mucins in this anatomical feature. We also studied the distribution pattern of the interstitial cells of Cajal (ICC) to evaluate their regulatory influence on gut motility. The groove originated near the cecocolic junction and extended along the mesenteric side of the ascending colon, limited at both ends by nonpapillated ridges...
July 20, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28719325/serologic-monitoring-of-public-health-interventions-against-strongyloides-stercoralis
#5
Paola Vargas, Alejandro J Krolewiecki, Adriana Echazú, Marisa Juarez, Pamela Cajal, Jose F Gil, Nicolás Caro, Julio Nasser, Patrick Lammie, Rubén O Cimino
Northwestern Argentina is endemic for soil-transmitted helminths, and annual deworming programs are carried out in prioritized areas. High prevalence of Strongyloides stercoralis was reported in this area; therefore, control programs including ivermectin are being evaluated. The NIE-enzyme linked immunosorbent assay (ELISA) was used for this purpose. In this community trial, two groups of patients, classified according to housing and living conditions were evaluated. Simultaneous with baseline survey, Group 1 was moved to new households with access to improved water and sanitation facilities (W and S), where deworming (MDA, massive drug administration) took place within 1 month; whereas Group 2 received MDA but remained living with unimproved W and S...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28705804/loss-of-nitric-oxide-mediated-inhibition-of-purine-neurotransmitter-release-in-the-colon-in-the-absence-of-interstitial-cells-of-cajal
#6
Leonie Durnin, Andrea Lees, Sheerien Manzoor, Kent C Sasse, Kenton M Sanders, Violeta N Mutafova-Yambolieva
Regulation of colonic motility depends upon the integrity of enteric inhibitory neurotransmission mediated by nitric oxide (NO), purine neurotransmitters, and neuropeptides. Intramuscular interstitial cells of Cajal (ICC-IM) and platelet-derived growth factor receptor α-positive (PDGFRα(+)) cells are involved in generating responses to NO and purine neurotransmitters, respectively. Previous studies have suggested a decreased nitrergic and increased purinergic neurotransmission in Kit(W)/Kit(W-v) (W/W(v) ) mice that display lesions in ICC-IM along the gastrointestinal tract...
July 13, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28697132/overexpression-of-yes-associated-protein-1-an-independent-prognostic-marker-in-patients-with-pancreatic-ductal-adenocarcinoma-correlated-with-liver-metastasis-and-poor-prognosis
#7
Maria Teresa Salcedo Allende, Jorge Zeron-Medina, Javier Hernandez, Teresa Macarulla, Joaquim Balsells, Xavier Merino, Helena Allende, Josep Tabernero, Santiago Ramon Y Cajal Agüeras
OBJECTIVES: Pancreatic ductal adenocarcinoma (PDAC) is a lethal cancer. Overexpression of Yes associated protein 1 (YAP1), a downstream target of Hippo pathway, implicated in regulation of cell growth and apoptosis, has been reported in several human tumor types. The objective of this study was to investigate YAP1 expression in patients with PDAC and its prognostic values. METHODS: We evaluated YAP1 expression in 64 PDAC and 15 chronic pancreatitis (CP) cases and its related pancreatic intraepithelial neoplasia (PanIN) lesions and in 5 control subjects...
August 2017: Pancreas
https://www.readbyqxmd.com/read/28694567/immunohistochemistry-in-ureteropelvic-junction-obstruction-and-its-correlation-to-postoperative-outcome
#8
Anusiri Inugala, Ramesh Kota Reddy, Bhuvaneshwar Nadipalli Rao, Sreenivas P Reddy, Radhika Othuluru, Lavanya Kanniyan, Nagarjuna Kumbha, Srinivas Srirampur
AIM: To investigate the correlation between the status of interstitial cells of Cajal (ICC) in ureteropelvic junction (UPJ) and the resected ureteric margin and the postoperative outcome of Anderson-Hynes pyeloplasty in UPJ obstruction (UPJO) and to compare the ICC in the UPJ and the resected margin of the normal ureter. MATERIALS AND METHODS: An observational study was conducted over a period of 2 years at the Department of Pediatric Surgery at Niloufer Institute of Women and Child Health...
July 2017: Journal of Indian Association of Pediatric Surgeons
https://www.readbyqxmd.com/read/28689885/reduction-of-hydrogen-sulfide-synthesis-enzymes-cystathionine-%C3%AE-synthase-and-cystathionine-%C3%AE-lyase-in-the-colon-of-patients-with-hirschsprungs-s-disease
#9
Christian Tomuschat, Anne Marie O'Donnell, David Coyle, Prem Puri
PURPOSE: Hirschsprung's associated enterocolitis (HAEC) is the most common cause of morbidity and mortality in Hirschsprung's Disease (HSCR). The pathogenesis of HAEC is poorly understood. In recent years, there is increasing evidence that a compromised intestinal barrier function plays a major role in the pathogenesis of HAEC. Hydrogen sulfide, synthesized from L-cysteine by two key enzymes, cystathionine-β-synthase (CBS) and cystathionine-γ-lysase (CSE) is reported to play a key role in regulating gastrointestinal motility and promoting resolution of inflammation...
June 23, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28687563/axitinib-treatment-in-advanced-rai-resistant-differentiated-thyroid-cancer-dtc-and-refractory-medullary-thyroid-cancer-mtc
#10
Jaume Capdevila, Jose Manuel Trigo, Javier Aller, Jose Luis Manzano, Silvia Garcia-Adrian, Carles Zafon, Oscar Reig, Uriel Bohn, Teresa Ramon Y Cajal, Manuel Duran, Beatriz Gonzalez-Astorga, Ana Lopez-Alfonso, Javier Medina, Ignacio Porras, Juan Jose Reina, Nuria Palacios, Enrique Grande, Elena Cillan, Ignacio Matos, Juan Jose Grau
BACKGROUND: Axitinib, an antiangiogenic multikinase inhibitor (MKI) was evaluated in the compassionate-use-program in Spain (October 2012-November 2014). MATERIALS AND METHODS: 47 patients with advanced radioactive iodine-refractory differentiated thyroid cancer (DTC, n=34) or medullary thyroid cancer (MTC, n=13) with documented disease progression were treated with axitinib 5 mg bid. The primary efficacy endpoint was overall response rate (ORR) by RECIST v1.1. Progression-free survival (PFS) and adverse events (AEs) were secondary objectives...
July 7, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28685234/prostanoid-ep3-receptor-agonist-sulprostone-enhances-pacemaker-activity-of-colonic-interstitial-cells-of-cajal
#11
Man Woo Kim, Han Yi Jiao, Seok Won Kim, Chan Guk Park, Mei Jin Wu, Chansik Hong, Seok Choi, Jae Yeoul Jun
EP receptor activation by PGE2 regulates gastrointestinal motility by modulating smooth muscle contractility. Interstitial cells of Cajal (ICCs) are pacemaker cells that regulate smooth muscle activity. We aimed to determine effects of the EP3 receptor agonist sulprostone on pacemaker potentials in colonic ICCs. We performed a whole cell patch clamp, RT-PCR, and Ca(2+) imaging in cultured ICCs from mouse colon. Sulprostone depolarized the membrane and increased pacemaker frequency. EP3 receptor antagonist blocked these sulprostone-induced effects...
July 6, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28679338/reduced-interstitial-cells-of-cajal-and-increased-intraepithelial-lymphocytes-are-associated-with-development-of-small-intestinal-bacterial-overgrowth-in-post-infectious-ibs-mouse-model
#12
Binrui Chen, Shuwen Zhu, Lijun Du, Huiqin He, John J Kim, Ning Dai
OBJECTIVE: Intestinal dysmotility and immune activation are likely involved in the pathogenesis of small intestinal bacteria overgrowth (SIBO) in irritable bowel syndrome (IBS). We aimed at investigating the role of interstitial cells of Cajal (ICC) and intestinal inflammation in the development of SIBO using a post-infectious IBS (PI-IBS) mouse model. MATERIALS AND METHODS: NIH mice were randomly infected with Trichinella spiralis. Visceral sensitivity and stool pattern were assessed at 8-weeks post-infection (PI)...
July 5, 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/28678840/diabetes-induced-oxidative-stress-mediates-upregulation-of-rhoa-rho-kinase-pathway-and-hypercontractility-of-gastric-smooth-muscle
#13
Sunila Mahavadi, Wimolpak Sriwai, Olivia Manion, John R Grider, Karnam S Murthy
The pathogenesis of diabetes-associated motility disorders are multifactorial and attributed to abnormalities in extrinsic and intrinsic innervation, and a decrease in the number of interstitial cells of Cajal, and nNOS expression and activity. Here we studied the effect of hyperglycemia on smooth muscle function. Using smooth muscles from the fundus of ob/ob mice and of wild type (WT) mice treated with 30 mM glucose (HG), we identified the molecular mechanism by which hyperglycemia upregulates RhoA/Rho kinase pathway and muscle contraction...
2017: PloS One
https://www.readbyqxmd.com/read/28671737/the-phase-response-and-state-space-of-slow-wave-contractions-in-the-small-intestine
#14
Sean P Parsons, Jan D Huizinga
The interstitial cells of Cajal (ICC) generate electrical oscillations in the gut. Synchronisation of the ICC population is required for generation of coherent electrical waves ("slow waves") that cause muscular contraction and thereby move gut content. The phase response curve (PRC) is an experimental measure of the dynamical rules governing a population of oscillators, that determine their synchrony, and gives an experimental window onto the state space of the oscillator, its dynamical landscape. We measured the PRC of slow wave contractions in the mouse small intestine by the novel combination of diameter mapping and single pulse electrical field stimulation...
July 3, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28671186/transplantation-of-enteric-nervous-system-stem-cells-rescues-nitric-oxide-synthase-deficient-mouse-colon
#15
Conor J McCann, Julie E Cooper, Dipa Natarajan, Benjamin Jevans, Laura E Burnett, Alan J Burns, Nikhil Thapar
Enteric nervous system neuropathy causes a wide range of severe gut motility disorders. Cell replacement of lost neurons using enteric neural stem cells (ENSC) is a possible therapy for these life-limiting disorders. Here we show rescue of gut motility after ENSC transplantation in a mouse model of human enteric neuropathy, the neuronal nitric oxide synthase (nNOS(-/-)) deficient mouse model, which displays slow transit in the colon. We further show that transplantation of ENSC into the colon rescues impaired colonic motility with formation of extensive networks of transplanted cells, including the development of nNOS(+) neurons and subsequent restoration of nitrergic responses...
July 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/28664138/naringenin-inhibits-pacemaking-activity-in-interstitial-cells-of-cajal-from-murine-small-intestine
#16
Hyun Jung Kim, Byung Joo Kim
BACKGROUND: Naringenin (NRG) is a common dietary polyphenolic constituent of fruits. NRG has diverse pharmacological activities, and is used in traditional medicine to treat various diseases including gastrointestinal (GI) disorders. Interstitial cells of Cajal (ICCs) are pacemaker cells of the GI tract. In this study, the authors investigated the effects of NRG on ICCs and on GI motility in vitro and in vivo. METHODS: ICCs were dissociated from mouse small intestines by enzymatic digestion...
June 2017: Integrative medicine research
https://www.readbyqxmd.com/read/28655507/hyperplasia-of-interstitial-cells-of-cajal-leads-to-rapid-gastric-emptying-in-diabetes
#17
EDITORIAL
Sean M Ward
No abstract text is available yet for this article.
June 24, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28637318/experience-dependent-regulation-of-cajal-retzius-cell-networks-in-the-developing-and-adult-mouse-hippocampus
#18
Max Anstötz, Sun Kyong Lee, Tamra I Neblett, Gabriele M Rune, Gianmaria Maccaferri
In contrast to their near-disappearance in the adult neocortex, Cajal-Retzius cells have been suggested to persist longer in the hippocampus. A distinctive feature of the mature hippocampus, not maintained by other cortical areas, is its ability to sustain adult neurogenesis. Here, we have investigated whether environmental manipulations affecting hippocampal postnatal neurogenesis have a parallel impact on Cajal-Retzius cells. We used multiple mouse reporter lines to unequivocally identify Cajal-Retzius cells and quantify their densities during postnatal development...
June 16, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28632504/what-is-new-in-gastrointestinal-stromal-tumor
#19
Inga-Marie Schaefer, Adrián Mariño-Enríquez, Jonathan A Fletcher
The classification "gastrointestinal stromal tumor" (GIST) became commonplace in the 1990s and since that time various advances have characterized the GIST lineage of origin, tyrosine kinase mutations, and mechanisms of response and resistance to targeted therapies. In addition to tyrosine kinase mutations and their constitutive activation of downstream signaling pathways, GISTs acquire a sequence of chromosomal aberrations. These include deletions of chromosomes 14q, 22q, 1p, and 15q, which harbor putative tumor suppressor genes required for stepwise progression from microscopic, preclinical forms of GIST (microGIST) to clinically relevant tumors with malignant potential...
June 19, 2017: Advances in Anatomic Pathology
https://www.readbyqxmd.com/read/28630879/imaging-cajal-s-neuronal-avalanche-how-wide-field-optical-imaging-of-the-point-spread-advanced-the-understanding-of-neocortical-structure-function-relationship
#20
REVIEW
Ron D Frostig, Cynthia H Chen-Bee, Brett A Johnson, Nathan S Jacobs
This review brings together a collection of studies that specifically use wide-field high-resolution mesoscopic level imaging techniques (intrinsic signal optical imaging; voltage-sensitive dye optical imaging) to image the cortical point spread (PS): the total spread of cortical activation comprising a large neuronal ensemble evoked by spatially restricted (point) stimulation of the sensory periphery (e.g., whisker, pure tone, point visual stimulation). The collective imaging findings, combined with supporting anatomical and electrophysiological findings, revealed some key aspects about the PS including its very large (radius of several mm) and relatively symmetrical spatial extent capable of crossing cytoarchitectural borders and trespassing into other cortical areas; its relationship with underlying evoked subthreshold activity and underlying anatomical system of long-range horizontal projections within gray matter, both also crossing borders; its contextual modulation and plasticity; the ability of its relative spatiotemporal profile to remain invariant to major changes in stimulation parameters; its potential role as a building block for integrative cortical activity; and its ubiquitous presence across various cortical areas and across mammalian species...
July 2017: Neurophotonics
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