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George A Fisher, Edward M Wolin, Nilani Liyanage, Susan Pitman Lowenthal, Beloo Mirakhur, Rodney F Pommier, Montaser Shaheen, Aaron I Vinik
OBJECTIVE: This ELECT prospective analysis examined lanreotide depot/autogel for carcinoid syndrome (CS) symptom control in patients with neuroendocrine tumors (NETs) who were responsive to prior octreotide (prior octreotide group) compared with patients who were naïve to prior somatostatin analogue treatment (de novo group). METHODS: Adults with histopathologically confirmed NET and stable CS (diarrhea and/or flushing) were randomized to subcutaneous (SC) lanreotide 120 mg or placebo every 4 weeks for 16 weeks...
March 2018: Endocrine Practice
Ludmila S Almeida, Maidane C Araújo, Denise E Zantut-Wittmann, Lígia V Assumpção, Thiago F Souza, Cleide M Silva, Juliana L Argenton, Allan O Santos, Jair Mengatti, Celso D Ramos, Elba C Etchebehere
BACKGROUND: Radioiodine-refractory thyroid carcinomas (RAIRs) are characterized by reduced expression of sodium-iodine symporter, rising serum thyroglobulin levels, and negative whole-body radioiodine scans. Interestingly, RAIRs continue to express somatostatin receptors and can be identified with Ga-DOTATATE PET/CT imaging. OBJECTIVE: The objective of this study was to compare lesion detectability in Ga-DOTATATE PET/CT performed with elevated thyroid-stimulating hormone (eTSH) levels with suppressed thyroid-stimulating hormone (sTSH) levels...
March 14, 2018: Nuclear Medicine Communications
Laurence Dufourny, Oona Delmas, Ana-Paula Teixeira-Gomes, Caroline Decourt, Joanna H Sliwowska
Somatostatin (SST) a neuropeptide involved in the central modulation of several physiological functions, is co-distributed in the same hypothalamic areas as kisspeptin (KP), the most potent secretagogue of the gonadotropin-releasing hormone (GnRH) secretion known to date. As SST infused intracerebroventricularly (icv) evoked a potent inhibition of GnRH release, we explored neuroanatomical relationships between KP and SST populations in male and female rats. For that, intact males and ovariectomised oestradiol-replaced females were killed and their brains processed in order to simultaneously detect KP, SST and synapsin, a marker for synapses...
March 15, 2018: Journal of Neuroendocrinology
Mary Courtney Moore, David E Kelley, Raul C Camacho, Peter Zafian, Tian Ye, Songnian Lin, Niels C Kaarsholm, Ravi Nargund, Terri M Kelly, Margaret Van Heek, Stephen F Previs, Christopher Moyes, Marta S Smith, Ben Farmer, Phil Williams, Alan D Cherrington
We evaluated the hepatic and nonhepatic responses to glucose-responsive insulin (GRI). Eight dogs received GRI or regular human insulin (HI) in random order. A primed, continuous intravenous infusion of [3-3 H]glucose began at -120 min. Basal sampling (-30 to 0 min) was followed by 2 study periods (150 min each), P1 and P2. At 0 min, somatostatin and GRI (36±3 pmol/kg/min) or HI (1.8 pmol/kg/min) were infused IV; basal glucagon was replaced intraportally. Glucose was infused intravenously to clamp plasma glucose at 80 mg/dL (P1) and 240 mg/dL (P2)...
March 14, 2018: Diabetes
Ewa Siucinska, Wojciech Brutkowski, Tytus Bernas
We found previously that fear conditioning by combined stimulation of a row B facial vibrissae (conditioned stimulus, CS) with a tail shock (unconditioned stimulus, UCS) leads to expansion of the cortical representation of the "trained" row, labeled with 2-deoxyglucose (2DG), in the layer IIIb/IV of the adult mouse the primary somatosensory cortex (S1) 24 h later. We have observed that learning - dependent these plastic changes are manifested by increased expression of somatostatin, cholecystokinin (SST+, CCK+) but not parvalbumin (PV+) immunopositive interneurons...
March 14, 2018: ACS Chemical Neuroscience
C Boy, T Poeppel, J Kotzerke, B J Krause, H Amthauer, R P Baum, I Buchmann, S Ezziddin, D Führer, M Gabriel, T Kuwert, H Lahner, T Lauenstein, H R Maecke, J Nagarajah, F Rösch, K Scheidhauer, M Schmidt, M A Walter, A Bockisch
The present guideline is focused on quality assurance of somatostatin receptor PET/CT (SSTR-PET/CT) in oncology patients. The document has been developed by a multidisciplinary board of specialists providing consensus of definitions, prerequisites, methodology, operating procedures, assessment, and standardized reporting. In particular, imaging procedures for the two most commonly used radioligands of human SSTR, i. e. 68Ga-DOTATOC and 68Ga-DOTATATE are presented. Overall, SSTR-PET/CT requires close interdisciplinary communication and cooperation of referring and executing medical disciplines, taking into account existing guidelines and recommendations of the European and German medical societies, including the European Association of Nuclear Medicine (EANM), German Society for Endocrinology (DGE), German Society for Nuclear Medicine (DGN) and German Society for Radiology (DRG)...
February 2018: Nuklearmedizin. Nuclear Medicine
István Z Bátai, Ádám Horváth, Erika Pintér, Zsuzsanna Helyes, Gábor Pozsgai
Transient receptor potential ankyrin 1 (TRPA1) non-selective ligand-gated cation channels are mostly expressed in primary sensory neurons. Polysulfides (POLYs) are Janus-faced substances interacting with numerous target proteins and associated with both protective and detrimental processes. Activation of TRPA1 in sensory neurons, consequent somatostatin (SOM) liberation and action on sst4 receptors have recently emerged as mediators of the antinociceptive effect of organic trisulfide dimethyl trisulfide (DMTS)...
2018: Frontiers in Endocrinology
Juan R Martinez-Galan, Ana Verdejo, Elena Caminos
Disturbances in calcium homeostasis due to canonical transient receptor potential (TRPC) and/or store-operated calcium (SOC) channels can play a key role in a large number of brain disorders. TRPC channels are plasma membrane cation channels included in the transient receptor potential (TRP) superfamily. The most widely distributed member of the TRPC subfamily in the brain is TRPC1, which is frequently linked to group I metabotropic glutamate receptors (mGluRs) and to the components of SOC channels. Proposing TRPC/SOC channels as a therapeutic target in neurological diseases previously requires a detailed knowledge of the distribution of such molecules in the brain...
2018: Frontiers in Neuroanatomy
Manish K Thakur, Lance Heilbrun, Kimberlee Dobson, Julie Boerner, Karri Stark, Jing Li, Daryn Smith, Elisabeth Heath, Joseph Fontana, Ulka Vaishampayan
BACKGROUND: Pasireotide (SOM230; Novartis Inc, Basel, Switzerland) is a multitargeted somatostatin receptor analogue likely to treat the neuroendocrine, and docetaxel resistant components within metastatic castrate-resistant prostate cancer (mCRPC). This phase I trial tested the combination of pasireotide, docetaxel, and prednisone in pretreated mCRPC. PATIENTS AND METHODS: Chemotherapy naive mCRPC patients received docetaxel 75 mg/m2 intravenously every 21 days and pasireotide intramuscularly every 28 days at escalating dose levels of 40, 60, and 80 mg...
February 13, 2018: Clinical Genitourinary Cancer
Marie Paquet, Mathieu Gauthé, Jules Zhang Yin, Valérie Nataf, Ophélie Bélissant, Philippe Orcel, Christian Roux, Jean-Noël Talbot, Françoise Montravers
PURPOSE: Oncogenic osteomalacia is an endocrine disorder induced by small benign tumours (TIO) producing excessive fibroblast growth factor-23 (FGF23). The only way of curing oncogenic osteomalacia is surgical resection of the culprit TIO, which is extremely difficult to detect using conventional imaging modalities due to its small size and variable location in the body. Since TIO frequently overexpress somatostatin receptors, a clinical utility of SPECT or PET with radiolabelled somatostatin analogues has been reported...
March 12, 2018: European Journal of Nuclear Medicine and Molecular Imaging
Lei Liu, Wataru Ito, Alexei Morozov
Region and cell-type restricted expression of light-activated ion channels is the indispensable tool to study properties of synapses in specific circuits and to monitor synaptic alterations by various stimuli including neuromodulators and behaviors, both ex vivo and in vivo . These analyses require the light-activated proteins or viral vectors for their delivery that do not interfere with the phenomenon under study. Here, we report a case of such interference in which the high-level expression of channelrhodopsin-2 introduced in the somatostatin-positive GABAergic neurons of the dorsomedial prefrontal cortex by an adeno-associated virus vector weakens the presynaptic GABAb receptor-mediated suppression of GABA release...
April 2018: Neurophotonics
Shady E Anis, Mira Lotfalla, Muhammad Zain, Nora N Kamel, Ahmed A Soliman
BACKGROUND: The distinction between meningioma, schwannoma and solitary fibrous tumour/ hemangiopericytoma can be challenging in some cases. This study evaluates the expression of Somatostatin receptor 2A (SSTR2A) and Claudin-1 in these different tumours. MATERIAL AND METHODS: Thirty-five cases of meningioma, 10 cases of intracranial schwannoma and 10 cases of hemangiopericytoma were assessed. The immunohistochemical expression of SSTR2A and Claudin-1 was evaluated and scored according to the percentage of immunostained tumour cells (0: 1+, 2+ and 3)...
February 15, 2018: Open Access Macedonian Journal of Medical Sciences
Yusuf Menda, Mark T Madsen, Thomas M O'Dorisio, John Sunderland, Leonard G Watkins, Joseph S Dillon, Sarah L Mott, Michael King Schultz, Gideon K D Zamba, David L Bushnell, M Sue O'Dorisio
Pre-therapy PET imaging with86 Y-DOTATOC PET is considered the ideal dosimetry protocol for90 Y-DOTATOC therapy; however, its cost, low availability and the need for infusion of amino acids to mimic the therapy administration limit its use in the clinical setting. Objectives: To develop a dosimetric method for90 Y-DOTATOC therapy using90 Y-DOTATOC PET/CT and Bremsstrahlung SPECT/CT imaging and to determine if dosimetry-based administered activities differed significantly from standard administered dosages. Materials and Methods: This is a prospective Phase 2 trial of90 Y-DOTATOC therapy in patients with somatostatin receptor positive tumors...
March 9, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Jeremy Streuli, Alan G Harris, Cecilia Cottiny, Florent Allagnat, Adrian F Daly, Eric Grouzmann, Karim Abid
BACKGROUND: Somatostatin analogs (SSAs) are first-line medical therapy for the treatment of acromegaly and neuroendocrine tumors that express somatostatin receptors (SSTR). Somatostatin suppresses secretion of a large number of hormones through the stimulation of the five SSTR. However, unbalanced inhibition of secretion as observed with the highly potent SSAs pasireotide causes hyperglycaemia mainly by inhibiting insulin secretion. In contrast, AP102 a new SSAs has neutral effect on blood glucose while suppressing GH secretion...
March 2, 2018: Neuropeptides
Jie Bai, Xin Liu, Le Goff Laetitia, Gargala Gilles, Francois Arnaud, Ballet Jean Jacques, Ducrotte Phillipe, Favennec Loic, Liqianhai Towledahong
Somatostatins are proteins that are involved in gastrointestinal function. However, little is known with regard to somatostatin receptor subtype (SSTR) expression changes that occur in the jejunum during low-grade inflammation and during subsequent octreotide treatment. The aim of the present study was to investigate the expression of SSTRs in the jejunums of Cryptosporidium parvum (C. parvum)-infected rats by immunohistochemisty, reverse transcription (RT) PCR and quantitative real-time RT-PCR assays. Five-day-old suckling Sprague-Dawley rats (n = 15 for each group) were orally gavaged with 105 Nouzilly isolate (NoI) oocysts...
2018: PloS One
Stefania Chetcuti Zammit, Reena Sidhu
PURPOSE OF REVIEW: The objective is to provide an overview on the cause of small bowel bleeding. We discuss the role of small bowel endoscopy in the management of small bowel bleeding and provide an outline of pharmacotherapy that can be additionally beneficial. RECENT FINDINGS: Small bowel capsule endoscopy (SBCE) is the initial diagnostic investigation of choice in small bowel bleeding. Computed tomography (CT) can be helpful in the context of small bowel tumours...
March 7, 2018: Current Opinion in Gastroenterology
Leandro Kasuki, Marilia Duarte Dalmolin, Luiz Eduardo Armondi Wildemberg, Mônica R Gadelha
BACKGROUND: Few studies evaluated the use of cabergoline (CAB) for acromegaly treatment in monotherapy or in combination with first-generation somatostatin receptor ligands (SRLs). AIM: Evaluate the efficacy, predictors of response and safety of CAB treatment in acromegaly both in monotherapy and in combination with SRLs. METHODS: We retrospectively collected demographic, biochemical, tumor and treatment data. Short-term disease control was defined as random GH level <1...
March 9, 2018: Clinical Endocrinology
Dong-Sik Kim, Woong Bae Ji, Jae Hyun Han, Yoon Young Choi, Hyun-Jin Park, Young-Dong Yu, Ju Young Kim
Purpose: Posthepatectomy liver failure is a serious complication and considered to be caused by increased portal pressure and flow. Splanchnic vasoactive agents and propranolol are known to decrease portal pressure. The aim of this study was to identify optimal candidates with potential for clinical use among somatostatin, terlipressin, and propranolol using rats with 90% hepatectomy. Methods: Rats were divided into 5 groups: sham operation (n = 6), control (n = 20), propranolol (n = 20), somatostatin (n = 20), and terlipressin group (n = 20)...
March 2018: Annals of Surgical Treatment and Research
Jared W Young, Zackary A Cope, Benedetto Romoli, Esther Schrurs, Aniek Joosen, Jordy van Enkhuizen, Richard F Sharp, Davide Dulcis
Developing novel therapeutics for bipolar disorder (BD) has been hampered by limited mechanistic knowledge how sufferers switch between mania and depression-how the same brain can switch between extreme states-described as the "holy grail" of BD research. Strong evidence implicates seasonally-induced switching between states, with mania associated with summer-onset, depression with winter-onset. Determining mechanisms of and sensitivity to such switching is required. C57BL/6J and dopamine transporter hypomorphic (DAT-HY 50% expression) mice performed a battery of psychiatry-relevant behavioral tasks following 2-week housing in chambers under seasonally relevant photoperiod extremes...
February 27, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
S Li, H Huang, K Xu, Z J Xu
Objective: To describe the clinical characteristics of respiratory manifestations of yellow nail syndrome. Methods: We conducted a retrospective analysis of 2 patients with respiratory diseases associated with yellow nail syndrome. Their clinical and chest radiological data were collected. We searched PubMed, Wanfang and CNKI databases with the keywords "yellow nail syndrome, yellow nail and lung" in Chinese and English. And the relevant literatures, including 6 articles in Chinese and 81 articles in English, were reviewed...
March 12, 2018: Chinese Journal of Tuberculosis and Respiratory Diseases
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