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https://www.readbyqxmd.com/read/29353105/biomimetic-and-enzyme-responsive-dynamic-hydrogels-for-studying-cell-matrix-interactions-in-pancreatic-ductal-adenocarcinoma
#1
Hung-Yi Liu, Murray Korc, Chien-Chi Lin
The tumor microenvironment (TME) governs all aspects of cancer progression and in vitro 3D cell culture platforms are increasingly developed to emulate the interactions between components of the stromal tissues and cancer cells. However, conventional cell culture platforms are inadequate in recapitulating the TME, which has complex compositions and dynamically changing matrix mechanics. In this study, we developed a dynamic gelatin-hyaluronic acid hybrid hydrogel system through integrating modular thiol-norbornene photopolymerization and enzyme-triggered on-demand matrix stiffening...
January 8, 2018: Biomaterials
https://www.readbyqxmd.com/read/29353085/reactions-of-a-tetranuclear-pt-thiosemicarbazone-complex-with-model-proteins
#2
Tiziano Marzo, Francisco Navas, Damiano Cirri, Antonello Merlino, Giarita Ferraro, Luigi Messori, Adoracion G Quiroga
The tetranuclear Pt complex (PtL)4 (where L2- is the anion derived from para-isopropyl thiosemicarbazone) was first described in A.G. Quiroga et al., J. Med. Chem. 41, 1998, 1399-1408. (PtL)4 manifests antiproliferative properties toward various cancer cell lines being a promising anticancer drug candidate. Yet, details of its reactivity with biomolecules have not been elucidated. To this end, we investigated the reactions of (PtL)4 with a few model proteins, i.e. bovine pancreatic ribonuclease (RNase A), cytochrome c (Cyt c) and hen egg white lysozyme (Lysozyme), through electrospray ionization mass spectrometry and other biophysical methods...
January 10, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29352965/establishment-of-a-protocol-for-the-isolation-of-feline-pancreatic-islets
#3
I R Brandão, E Zini, C E Reusch, T A Lutz, M Osto
Diabetes mellitus is a common endocrinopathy in cats that is associated with pancreatic islets lesions. Research on isolated islets contributed to the understanding of the pathophysiology of human diabetes. Therefore, by improving the existing methods of isolation in cats, we aimed at increasing islet yield, purity and viability of feline isolated islets. Islet isolation was accomplished by pancreas perfusion with 80ml of Collagenase type IV through the pancreatic duct at the site of the major papilla. The enzymatic digestion was combined with mechanical disruption and controlled by dithizone staining...
January 15, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29352883/the-use-of-starch-azure-for-measurement-of-alpha-amylase-activity
#4
Gábor Lehoczki, Lili Kandra, Gyöngyi Gyémánt
Despite being widely used, there is no standard protocol for α-amylase activity measurement with starch azure substrate. Boiling pre-treatment of starch azure suspension increased the reaction rate of hydrolysis catalysed by human salivary α-amylase (HSA) or porcine pancreatic α-amylase (PPA) and the sensitivity of spectrophotometric activity measurement has been improved. Kinetic constants, KM, and vmax, obtained from parallel isothermal titration calorimetric (ITC) measurements on natural and starch azure revealed, that the blue starch derivative does not differ significantly from its natural counterpart from kinetic point of view...
March 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352660/clinical-significance-of-muc13-in-pancreatic-ductal-adenocarcinoma
#5
Sheema Khan, Nadeem Zafar, Shabia S Khan, Saini Setua, Stephen W Behrman, Zachary E Stiles, Murali M Yallapu, Peeyush Sahay, Hemendra Ghimire, Tomoko Ise, Satoshi Nagata, Lei Wang, Jim Y Wan, Prabhakar Pradhan, Meena Jaggi, Subhash C Chauhan
BACKGROUND: Poor prognosis of pancreatic cancer (PanCa) is associated with lack of an effective early diagnostic biomarker. This study elucidates significance of MUC13, as a diagnostic/prognostic marker of PanCa. METHODS: MUC13 was assessed in tissues using our in-house generated anti-MUC13 mouse monoclonal antibody and analyzed for clinical correlation by immunohistochemistry, immunoblotting, RT-PCR, computational and submicron scale mass-density fluctuation analyses, ROC and Kaplan Meir curve analyses...
January 15, 2018: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/29352600/placental-control-of-metabolic-adaptations-in-the-mother-for-an-optimal-pregnancy-outcome-what-goes-wrong-in-gestational-diabetes
#6
David J Hill
As pregnancy progresses the placental syncytiotrophoblast increasingly assumes control of maternal glucose homeostasis through the release and counter-balancing effects of placental lactogen (PL) and placental variant growth hormone (GH-V). While local actions of these hormones on placental growth and function are likely to exist, each also exerts indirect actions to ensure fetal nutritional availability through modulation of the maternal insulin/insulin-like growth factor axis. Peripheral insulin resistance results from the increasing levels of GH-V in the maternal circulation and is counter-balanced by an increase in insulin availability through an expansion of maternal pancreatic β-cell mass...
January 9, 2018: Placenta
https://www.readbyqxmd.com/read/29352574/mismatch-repair-status-as-a-beneficial-predictor-of-fluorouracil-based-adjuvant-chemotherapy-for-pancreatic-cancer
#7
Dingkong Liang, Si Shi, Chen Liang, Qingcai Meng, Bo Zhang, Quanxing Ni, Jin Xu, Xianjun Yu
BACKGROUND: Prior studies have indicated that patients with colorectal cancer with deficient mismatch repair have particular clinicopathologic features that distinguish them from patients with tumors with proficient mismatch repair. However, the effect of the mismatch repair status on outcomes after adjuvant chemotherapy for pancreatic cancer is still unknown. METHODS: Pancreatic cancer patients who underwent R0 resection between January 2013 and December 2015 at Fudan University Shanghai Cancer Center were included in this study...
January 15, 2018: Surgery
https://www.readbyqxmd.com/read/29352519/nafamostat-mesilate-attenuates-inflammation-and-apoptosis-and-promotes-locomotor-recovery-after-spinal-cord-injury
#8
Hui-Quan Duan, Qiu-Li Wu, Xue Yao, Bao-You Fan, Hong-Yu Shi, Chen-Xi Zhao, Yan Zhang, Bo Li, Chao Sun, Xiao-Hong Kong, Xin-Fu Zhou, Shi-Qing Feng
AIM: Spinal cord injury (SCI) leads to severe neural damage for which there is currently no effective treatment. Exploration of the neuroprotective effect among clinically approved drugs will speed up clinical translation of SCI. Nafamostat mesilate (NM) as a synthetic serine protease inhibitor has been used clinically in pancreatitis treatments. However, its effectiveness in SCI is unknown. The aim of this study was to confirm the efficacy of NM in ameliorating SCI. METHODS: Intraperitoneal administration of NM was performed on a contusion SCI model in Wistar rat...
January 19, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29352379/magnetic-resonance-with-diffusion-weighted-imaging-improves-assessment-of-focal-liver-lesions-in-patients-with-potentially-resectable-pancreatic-cancer-on-ct
#9
Sun Kyung Jeon, Jeong Min Lee, Ijin Joo, Dong Ho Lee, Su Joa Ahn, Hyunsik Woo, Myoung Seok Lee, Jin-Young Jang, Joon Koo Han
PURPOSE: To investigate added value of MRI to preoperative staging MDCT for evaluation of focal liver lesions (FLLs) in potentially resectable pancreatic ductal adenocarcinomas (PDACs). MATERIALS AND METHODS: In patients with potentially resectable PDACs after staging MDCT (n=167), characteristics of FLLs were scored as benign, indeterminate or metastases on an MDCT set and combined MDCT and MRI set by two readers, independently. Size of hepatic lesions was measured and detection rate of hepatic metastasis unsuspected by MDCT and diagnostic yield of MRI for FLLs were assessed...
January 19, 2018: European Radiology
https://www.readbyqxmd.com/read/29352378/can-histogram-analysis-of-mr-images-predict-aggressiveness-in-pancreatic-neuroendocrine-tumors
#10
Riccardo De Robertis, Bogdan Maris, Nicolò Cardobi, Paolo Tinazzi Martini, Stefano Gobbo, Paola Capelli, Silvia Ortolani, Sara Cingarlini, Salvatore Paiella, Luca Landoni, Giovanni Butturini, Paolo Regi, Aldo Scarpa, Giampaolo Tortora, Mirko D'Onofrio
OBJECTIVES: To evaluate MRI derived whole-tumour histogram analysis parameters in predicting pancreatic neuroendocrine neoplasm (panNEN) grade and aggressiveness. METHODS: Pre-operative MR of 42 consecutive patients with panNEN >1 cm were retrospectively analysed. T1-/T2-weighted images and ADC maps were analysed. Histogram-derived parameters were compared to histopathological features using the Mann-Whitney U test. Diagnostic accuracy was assessed by ROC-AUC analysis; sensitivity and specificity were assessed for each histogram parameter...
January 19, 2018: European Radiology
https://www.readbyqxmd.com/read/29352311/decreased-%C3%AE-cell-mass-and-early-structural-alterations-of-the-exocrine-pancreas-in-patients-with-type-1-diabetes-an-analysis-based-on-the-npod-repository
#11
Fidéline Bonnet-Serrano, Marc Diedisheim, Roberto Mallone, Etienne Larger
BACKGROUND AND AIMS: Abnormal glucagon secretion and functional alterations of the exocrine pancreas have been described in patients with type 1 diabetes (T1D), but their respective anatomical substrata have seldom been investigated. Our aim was to develop an automated morphometric analysis process to characterize the anatomy of α-cell and exocrine pancreas in patients with T1D, using the publicly available slides of the Network for Pancreatic Organ Donors (nPOD). MATERIALS AND METHODS: The ratio of β- and α-cell area to total tissue area were quantified in 75 patients with T1D (thereafter patients) and 66 control subjects (thereafter controls), on 2 insulin-stained and 4 glucagon-stained slides from both the head and the tail of the pancreas...
2018: PloS One
https://www.readbyqxmd.com/read/29352230/histology-immunohistochemistry-and-in-situ-hybridization-reveal-overlooked-ebola-virus-target-tissues-in-the-ebola-virus-disease-guinea-pig-model
#12
Timothy K Cooper, Louis Huzella, Joshua C Johnson, Oscar Rojas, Sri Yellayi, Mei G Sun, Sina Bavari, Amanda Bonilla, Randy Hart, Peter B Jahrling, Jens H Kuhn, Xiankun Zeng
Survivors of Ebola virus infection may become subclinically infected, but whether animal models recapitulate this complication is unclear. Using histology in combination with immunohistochemistry and in situ hybridization in a retrospective review of a guinea pig confirmation-of-virulence study, we demonstrate for the first time Ebola virus infection in hepatic oval cells, the endocardium and stroma of the atrioventricular valves and chordae tendinae, satellite cells of peripheral ganglia, neurofibroblasts and Schwann cells of peripheral nerves and ganglia, smooth muscle cells of the uterine myometrium and vaginal wall, acini of the parotid salivary glands, thyroid follicular cells, adrenal medullary cells, pancreatic islet cells, endometrial glandular and surface epithelium, and the epithelium of the vagina, penis and, prepuce...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352220/soce-induced-calcium-overload-regulates-autophagy-in-acute-pancreatitis-via-calcineurin-activation
#13
Zhen-Dong Zhu, Tao Yu, Hua-Jing Liu, Jing Jin, Jun He
Acute pancreatitis (AP) is an acute inflammatory process of the pancreas that is characterized by inflammation, edema, vacuolization and necrosis, which has significant morbidity and lethality. The pathogenesis of AP has not been established completely. An early and critical feature of AP is the aberrant signaling of Calcium (Ca2+) within the pancreatic acinar cell, termed Ca2+ overload. Store-operated Ca2+ (SOC) channels are the principal Ca2+ influx channels that contribute to Ca2+ overload in pancreatic acinar cells...
January 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29352139/mitochondrial-glutamine-metabolism-via-got2-supports-pancreatic-cancer-growth-through-senescence-inhibition
#14
Seungyeon Yang, Sunsook Hwang, Minjoong Kim, Sung Bin Seo, Jeong-Hwa Lee, Seung Min Jeong
Cellular senescence, which leads to a cell cycle arrest of damaged or dysfunctional cells, is an important mechanism to restrain the malignant progression of cancer cells. Because metabolic changes underlie many cell-fate decisions, it has been suggested that cell metabolism might play key roles in senescence pathways. Here, we show that mitochondrial glutamine metabolism regulates senescence in human pancreatic ductal adenocarcinoma (PDAC) cells. Glutamine deprivation or inhibition of mitochondrial aspartate transaminase (GOT2) results in a profound induction of senescence and a suppression of PDAC growth...
January 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29352043/prognostic-implications-of-multiplex-detection-of-kras-mutations-in-cell-free-dna-from-patients-with-pancreatic-ductal-adenocarcinoma
#15
Min Kyeong Kim, Sang Myung Woo, Boram Park, Kyong-Ah Yoon, Yun-Hee Kim, Jungnam Joo, Woo Jin Lee, Sung-Sik Han, Sang-Jae Park, Sun-Young Kong
BACKGROUND: Cell-free DNA (cfDNA) is known to provide potential biomarkers for predicting clinical outcome, but its value in pancreatic ductal adenocarcinoma (PDAC) has not been fully evaluated. The aim of this study was to evaluate the clinical applicability of quantitative analysis of multiplex KRAS mutations in cell-free DNA from patients with PDAC. METHODS: A total of 106 patients with PDAC were enrolled in this prospective study. The concentration and fraction of KRAS mutations were determined through multiplex detection of KRAS mutations in plasma samples by use of a droplet digital PCR kit (Bio-Rad)...
January 19, 2018: Clinical Chemistry
https://www.readbyqxmd.com/read/29351990/saa3-is-a-key-mediator-of-the-protumorigenic-properties-of-cancer-associated-fibroblasts-in-pancreatic-tumors
#16
Magdolna Djurec, Osvaldo Graña, Albert Lee, Kevin Troulé, Elisa Espinet, Lavinia Cabras, Carolina Navas, María Teresa Blasco, Laura Martín-Díaz, Miranda Burdiel, Jing Li, Zhaoqi Liu, Mireia Vallespinós, Francisco Sanchez-Bueno, Martin R Sprick, Andreas Trumpp, Bruno Sainz, Fátima Al-Shahrour, Raul Rabadan, Carmen Guerra, Mariano Barbacid
Pancreatic ductal adenocarcinoma (PDAC) is characterized by the presence of abundant desmoplastic stroma primarily composed of cancer-associated fibroblasts (CAFs). It is generally accepted that CAFs stimulate tumor progression and might be implicated in drug resistance and immunosuppression. Here, we have compared the transcriptional profile of PDGFRα+ CAFs isolated from genetically engineered mouse PDAC tumors with that of normal pancreatic fibroblasts to identify genes potentially implicated in their protumorigenic properties...
January 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29351702/endoscopic-ultrasonography-guided-obliteration-of-a-left-inferior-phrenic-artery-pseudoaneurysm-in-a-patient-with-alcoholic-chronic-pancreatitis
#17
Deepak Gunjan, Shivanand Gamanagatti, Pramod Garg
No abstract text is available yet for this article.
January 19, 2018: Endoscopy
https://www.readbyqxmd.com/read/29351616/deficient-glucagon-response-to-hypoglycemia-during-a-mixed-meal-in-total-pancreatectomy-islet-autotransplantation-recipients
#18
L D Bogachus, M D Bellin, A Vella, R P Robertson
Context: Total pancreatectomy and intrahepatic islet autotransplantation (TP/IAT) is performed to alleviate severe abdominal pain, avoid narcotic use, maintain islet function, and avoid diabetes in patients with chronic pancreatitis. However, many TP/IAT recipients complain of post-prandial hypoglycemia. Objective: This study was designed to discover mechanisms of this problem. Design: Participants consumed a triple-isotope mixed meal. Setting: Hospital research unit...
January 17, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351489/cooperative-function-of-pdx1-and-oc1-in-multipotent-pancreatic-progenitors-impacts-postnatal-islet-maturation-and-adaptability
#19
Peter A Kropp, Jennifer C Dunn, Bethany A Carboneau, Doris A Stoffers, Maureen Gannon
The transcription factors Pdx1 and Oc1 are co-expressed in multipotent pancreatic progenitors (MPCs), but their expression patterns diverge in hormone-expressing cells, with Oc1 expression being extinguished in the endocrine lineage and Pdx1 being maintained at high levels in β cells. We previously demonstrated that cooperative function of these two factors in MPCs is necessary for proper specification and differentiation of pancreatic endocrine cells. In those studies, we observed a persistent decrease in expression of the β-cell maturity factor MafA...
December 12, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351483/prenatal-exposure-to-diesel-exhaust-pm2-5-causes-offspring-%C3%AE-cell-dysfunction-in-adulthood
#20
Minjie Chen, Shuai Liang, Xiaobo Qin, Li Zhang, Lianglin Qiu, Sufang Chen, Ziying Hu, Yanyi Xu, Wanjun Wang, Yuhao Zhang, Qi Cao, Zhekang Ying
BACKGROUND: Environmental stressors that encounter in early-life and cause abnormal fetal and/or neonatal development may increase susceptibility to non-communicable diseases such as diabetes. Maternal exposure to ambient fine particulate matter (PM2.5) is associated with various fetal abnormalities, suggesting that it may program offspring's susceptibility to diabetes. In the present study, we therefore examined whether maternal exposure to diesel exhaust PM2.5 (DEP), one of the major sources of ambient PM2...
December 26, 2017: American Journal of Physiology. Endocrinology and Metabolism
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