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https://www.readbyqxmd.com/read/28821944/the-2017-world-health-organization-classification-of-tumors-of-the-pituitary-gland-a-summary
#1
REVIEW
M Beatriz S Lopes
The 4th edition of the World Health Organization (WHO) classification of endocrine tumors has been recently released. In this new edition, major changes are recommended in several areas of the classification of tumors of the anterior pituitary gland (adenophypophysis). The scope of the present manuscript is to summarize these recommended changes, emphasizing a few significant topics. These changes include the following: (1) a novel approach for classifying pituitary neuroendocrine tumors according to pituitary adenohypophyseal cell lineages; (2) changes to the histological grading of pituitary neuroendocrine tumors with the elimination of the term "atypical adenoma;" and (3) introduction of new entities like the pituitary blastoma and re-definition of old entities like the null-cell adenoma...
August 18, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28821673/unc-18-and-tomosyn-antagonistically-control-synaptic-vesicle-priming-downstream-of-unc-13-in-c-elegans
#2
Seungmee Park, Na-Ryum Bin, Bin Yu, Raymond Wong, Ewa Sitarska, Kyoko Sugita, Ke Ma, Junjie Xu, Chi-Wei Tien, Arash Algouneh, Ekaterina Turlova, Siyan Wang, Pranay Siriya, Waleed Shahid, Lorraine Kalia, Zhong-Ping Feng, Philippe P Monnier, Hong-Shuo Sun, Mei Zhen, Shangbang Gao, Josep Rizo, Shuzo Sugita
Munc18-1/UNC-18 is believed to prime SNARE-mediated membrane fusion, yet the underlying mechanisms remain enigmatic. Here, we examined how potential gain-of-function mutations of Munc18-1/UNC-18 affect locomotory behavior and synaptic transmission, and how Munc18-1-mediated priming is related to Munc13-1/UNC-13 and Tomosyn/TOM-1, positive and negative SNARE regulators, respectively. We show that a Munc18-1(P335A)/UNC-18(P334A) mutation leads to significantly increased locomotory activity and acetylcholine release in C...
August 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821574/mosaic-loss-of-non-muscle-myosin-iia-and-iib-is-sufficient-to-induce-mammary-epithelial-proliferation
#3
Kim-Vy Nguyen-Ngoc, Vanesa L Silvestri, Dan Georgess, Amanda N Fairchild, Andrew J Ewald
The mammary epithelium elaborates through hormonally-regulated changes in proliferation, migration, and differentiation. Non-muscle myosin II (NMII) functions at the interface between contractility, adhesion, and signal transduction. It was therefore a plausible regulator of mammary morphogenesis. We tested the genetic requirement for NMIIA and NMIIB through deletion of the myosin heavy chains (NMHC) that confer specificity to the complex. Surprisingly, mosaic loss, but not ubiquitous loss, of NMHCIIA and IIB induced high levels of proliferation in 3D culture...
August 18, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28820880/knock-out-of-a-mitochondrial-sirtuin-protects-neurons-from-degeneration-in-caenorhabditis-elegans
#4
Rachele Sangaletti, Massimo D'Amico, Jeff Grant, David Della-Morte, Laura Bianchi
Sirtuins are NAD⁺-dependent deacetylases, lipoamidases, and ADP-ribosyltransferases that link cellular metabolism to multiple intracellular pathways that influence processes as diverse as cell survival, longevity, and cancer growth. Sirtuins influence the extent of neuronal death in stroke. However, different sirtuins appear to have opposite roles in neuronal protection. In Caenorhabditis elegans, we found that knock-out of mitochondrial sirtuin sir-2.3, homologous to mammalian SIRT4, is protective in both chemical ischemia and hyperactive channel induced necrosis...
August 18, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28819720/immunohistochemical-null-phenotype-for-mismatch-repair-proteins-in-colonic-carcinoma-associated-with-concurrent-mlh1-hypermethylation-and-msh2-somatic-mutations
#5
Tao Wang, Zsofia K Stadler, Liying Zhang, Martin R Weiser, Olca Basturk, Jaclyn F Hechtman, Efsevia Vakiani, Lenard B Saltz, David S Klimstra, Jinru Shia
Microsatellite instability, a well-established driver pathway in colorectal carcinogenesis, can develop in both sporadic and hereditary conditions via different molecular alterations in the DNA mismatch repair (MMR) genes. MMR protein immunohistochemistry (IHC) is currently widely used for the detection of MMR deficiency in solid tumors. The IHC test, however, can show varied staining patterns, posing challenges in the interpretation of the staining results in some cases. Here we report a case of an 80-year-old female with a colonic adenocarcinoma that exhibited an unusual "null" IHC staining pattern with complete loss of all four MMR proteins (MLH1, MSH2, MSH6, and PMS2)...
August 17, 2017: Familial Cancer
https://www.readbyqxmd.com/read/28819420/loss-of-complement-factor-h-in-plasma-increases-endothelial-cell-migration
#6
Ju Liu, Josephine Hoh
Tumor growth depends on angiogenesis, the growth of new blood vessels. Complement factor H (CFH) is a plasma glycoprotein that functions as a regulator of the complement system. The aim of this study is to delineate the role of CFH in angiogenesis. A conditional null allele of the Cfh gene was generated in C57BL/6J mice by flanking the exon 3 with loxP sites. The Cfh(flox/flox) mice were crossed with Rosa26-Cre mice to obtain the mice homozygotes of Cfh deletion (Cfh(-/-)). The Cfh(-/-) mice were examined by in vivo angiogenesis assays...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819106/identification-and-characterization-of-a-bacterial-homolog-of-chloride-intracellular-channel-clic-protein
#7
Shubha Gururaja Rao, Devasena Ponnalagu, Sowmya Sukur, Harkewal Singh, Shridhar Sanghvi, Yixiao Mei, Ding J Jin, Harpreet Singh
Chloride intracellular channels (CLIC) are non-classical ion channels lacking a signal sequence for membrane targeting. In eukaryotes, they are implicated in cell volume regulation, acidification, and cell cycle. CLICs resemble the omega class of Glutathione S-transferases (GST), yet differ from them in their ability to form ion channels. They are ubiquitously found in eukaryotes but no prokaryotic homolog has been characterized. We found that indanyloxyacetic acid-94 (IAA-94), a blocker of CLICs, delays the growth of Escherichia coli...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818995/maternal-dcaf2-is-crucial-for-maintenance-of-genome-stability-during-the-first-cell-cycle-in-mice
#8
Yi-Wen Xu, Lan-Rui Cao, Min Wang, Ying Xu, Xin Wu, Junping Liu, Chao Tong, Heng-Yu Fan
Precise regulation of DNA replication and genome integrity is crucial for gametogenesis and early embryogenesis. Cullin ring-finger ubiquitin ligase 4 (CRL4) has multiple functions in the maintenance of germ cell survival, oocyte meiotic maturation, and maternal-zygotic transition in mammals. DDB1-cullin 4-associated factor-2 (DCAF2, also known as DTL or CDT2) is an evolutionarily conserved substrate receptor of CRL4. To determine whether DCAF2 is a key CRL4 substrate adaptor in mammalian oocytes, we generated a novel mouse strain that carries a Dcaf2 allele flanked by LoxP sequences, and specifically deleted Dcaf2 in oocytes...
August 17, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28818867/exploring-potential-germline-associated-roles-of-the-trim-nhl-protein-nhl-2%C3%A2-through-rnai-screening
#9
Gregory M Davis, Wai Y Low, Joshua W T Anderson, Peter R Boag
TRIM-NHL proteins are highly conserved regulators of developmental pathways in vertebrates and invertebrates. The TRIM-NHL family member, NHL-2 in Caenorhabditis elegans functions as a miRNA cofactor to regulate developmental timing. Similar regulatory roles have been reported in other model systems, with the mammalian orthologue in mice, TRIM32, contributing to muscle and neuronal cell proliferation via miRNA activity. Given the interest associated with TRIM-NHL family proteins, we aimed to further investigate the role of NHL-2 in C...
August 17, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28818684/t-cell-mediated-rejection-of-human-cd34-cells-is-prevented-by-costimulatory-blockade-in-a-xenograft-model
#10
A L Oh, D Mahmud, B Nicolini, N Mahmud, V Senyuk, P R Patel, E Bonetti, M Arpinati, Jlm Ferrara, D Rondelli
A xenograft model of stem cell rejection was developed by co-transplantating human CD34+ and allogeneic CD3+ T cells into NOD-scid ɣ-chain(null) (NSG) mice. T cells caused graft failure when transplanted at any CD34:CD3 ratio between 1:50 to 1:0.1. Kinetics experiments showed that two weeks after transplantation CD34+ cells engrafted the marrow and T cells expanded in the spleen. Then at four weeks only memory T cells populated both sites and rejected CD34+ cells. Blockade of T cell costimulation was tested by injecting the mice with abatacept (CTLA4-IgG1) from day -1 to +27 (Group A), or from day -1 to +13 (Group B), or from day +14 to +28 (Group C)...
August 14, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28818041/erratum-to-nephron-development-and-extrarenal-features-in-a-child-with-congenital-nephrotic-syndrome-caused-by-null-lamb2-mutations
#11
Jiro Kin, Hiroyasu Tsukaguchi, Takahisa Kimata, Huan Thanh Nguyen, Yorika Nakano, Noriko Miyake, Naomichi Matsumoto, Kazunari Kaneko
No abstract text is available yet for this article.
August 17, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28817611/the-directed-migration-of-gonadal-distal-tip-cells-in-caenorhabditis-elegans-requires-ngat-1-a-%C3%A3-1-4-n-acetylgalactosaminyltransferase-enzyme
#12
Joseph Veyhl, Robert J Dunn, Wendy L Johnston, Alexa Bennett, Lijia W Zhang, James W Dennis, Harry Schachter, Joseph G Culotti
Glycoproteins such as growth factor receptors and extracellular matrix have well-known functions in development and cancer progression, however, the glycans at sites of modification are often heterogeneous molecular populations which makes their functional characterization challenging. Here we provide evidence for a specific, discrete, well-defined glycan modification and regulation of a stage-specific cell migration in Caenorhabditis elegans. We show that a chain-terminating, putative null mutation in the gene encoding a predicted β1,4-N-acetylgalactosaminyltransferase, named ngat-1, causes a maternally rescued temperature sensitive (ts) defect in the second phase of the three phase migration pattern of the posterior, but not the anterior, hermaphrodite Distal Tip Cell (DTC)...
2017: PloS One
https://www.readbyqxmd.com/read/28816559/the-role-of-the-lectin-like-oxldl-receptor-lox-1-in-traffic-generated-air-pollution-exposure-mediated-alteration-of-the-brain-microvasculature-in-apolipoprotein-apo-e-knockout-mice
#13
JoAnn Lucero, Usa Suwannasual, Lindsay M Herbert, Jacob D McDonald, Amie K Lund
Recent studies have shown a strong correlation between air pollution-exposure and detrimental outcomes in the central nervous system, including alterations in blood brain barrier (BBB) integrity, neuroinflammation, and neurodegeneration. However, the mechanisms mediating these pathologies have not yet been fully elucidated. We have previously reported that exposure to traffic-generated air pollution results in increased circulating oxidized low-density lipoprotein (oxLDL), associated with alterations in BBB integrity, in atherosclerotic Apolipoprotein E null (ApoE(-/-)) mice...
August 17, 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/28816361/msel-1l-deficiency-affects-vasculogenesis-and-neural-stem-cell-lineage-commitment
#14
Cardano M, Diaferia G R, Conti L, Baronchelli S, Sessa A, Broccoli V, Barbieri A, De Blasio P, Biunno I
mSEL-1L is a highly conserved ER-resident type I protein, involved in the degradation of misfolded peptides through the ubiquitin-proteasome system (UPS), a pathway known to control the plasticity of the vascular smooth muscle cells (VSMC) phenotype and survival. In this article we demonstrate that mSEL-1L deficiency interferes with the murine embryonic vascular network, showing particular irregularities in the intracranic and intersomitic neurovascular units and in the cerebral capillary microcirculation. During murine embryogenesis, mSEL-1L is expressed in cerebral areas known to harbor progenitor neural cells, while in the adult brain the protein is specifically restricted to the stem cell niches, co-localizing with Sox2 and Nestin...
August 17, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28816165/incidence-and-predictors-of-pericardial-effusion-after-chemoradiation-therapy-for-locally-advanced-non-small-cell-lung-cancer
#15
Matthew S Ning, Linglong Tang, Daniel R Gomez, Ting Xu, Yangkun Luo, Jinhai Huo, Elie Mouhayar, Zhongxing Liao
PURPOSE: Findings from Radiation Therapy Oncology Group (RTOG) 0617 suggested that collateral radiation to the heart may contribute to early death in patients receiving chemoradiation therapy for non-small cell lung cancer (NSCLC); however, reports of cardiac toxicity after thoracic radiation therapy (RT) remain limited. Because pericardial disease is the most common cardiac complication of thoracic RT, we investigated the incidence of and risk factors for pericardial effusion (PCE) in patients enrolled in a phase 2 prospective randomized study of intensity modulated RT versus proton therapy for locally advanced NSCLC...
September 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28816086/inducible-knockout-of-mouse-zfhx3-emphasizes-its-key-role-in-setting-the-pace-and-amplitude-of-the-adult-circadian-clock
#16
Ashleigh G Wilcox, Lucie Vizor, Michael J Parsons, Gareth Banks, Patrick M Nolan
The transcription factor zinc finger homeobox 3 (ZFHX3) plays a key role in coupling intracellular transcriptional-translational oscillations with intercellular synchrony in mouse suprachiasmatic nucleus (SCN). However, like many key players in central nervous system function, ZFHX3 serves an important role in neurulation and neuronal terminal differentiation while retaining discrete additional functions in the adult SCN. Recently, using a dominant missense mutation in mouse Zfhx3, we established that this gene can modify circadian period and sleep in adult animals...
August 1, 2017: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/28815502/flping-genes-on-and-off-in-drosophila
#17
Bonnie M Weasner, Jinjin Zhu, Justin P Kumar
The fruit fly, Drosophila melanogaster, has been a favorite experimental system of developmental biologists for more than a century. One of the most attractive features of this model system is the clarity by which one can analyze mutant phenotypes. Most genes are found in single copies, and loss-of-function mutants often have obvious phenotypes that can be analyzed during development and in adulthood. As with all metazoans, a significant fraction of Drosophila genes are used during both embryonic and postembryonic development, and null mutants often die during embryogenesis thereby precluding the analysis of postembryonic tissues...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28815275/similar-failure-rate-in-immediate-post-operative-weight-bearing-versus-protected-weight-bearing-following-meniscal-repair-on-peripheral-vertical-meniscal-tears
#18
Bryan Perkins, Kyle R Gronbeck, Ruixian Alexander Yue, Marc A Tompkins
PURPOSE AND HYPOTHESIS: Post-operative weight bearing after meniscal repair is a point of debate among physicians. This study sought to evaluate whether patients adhering to an immediate WBAT rehabilitation programme have a higher failure rate compared to those adhering to a more traditional, protected, NWB status following meniscal repair. The null hypothesis was that there would be no difference in failure between the two groups. METHODS: A retrospective review of meniscal repair patients greater than 5 years from surgery was performed for patients receiving meniscal repair treatment...
August 16, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28814482/lrig1-gastric-isthmal-progenitor-cells-restore-normal-gastric-lineage-cells-during-damage-recovery-in-adult-mouse-stomach
#19
Eunyoung Choi, Tyler L Lantz, Gregory Vlacich, Theresa M Keeley, Linda C Samuelson, Robert J Coffey, James R Goldenring, Anne E Powell
OBJECTIVE: Lrig1 is a marker of proliferative and quiescent stem cells in the skin and intestine. We examined whether Lrig1-expressing cells are long-lived gastric progenitors in gastric glands in the mouse stomach. We also investigated how the Lrig1-expressing progenitor cells contribute to the regeneration of normal gastric mucosa by lineage commitment to parietal cells after acute gastric injury in mice. DESIGN: We performed lineage labelling using Lrig1-CreERT2/+;R26R-YFP/+ (Lrig1/YFP) or R26R-LacZ/+ (Lrig1/LacZ) mice to examine whether the Lrig1-YFP-marked cells are gastric progenitor cells...
August 16, 2017: Gut
https://www.readbyqxmd.com/read/28814464/on-the-transition-from-reconsolidation-to-extinction-of-contextual-fear-memories
#20
Lindsey F Cassini, Charlotte R Flavell, Olavo B Amaral, Jonathan L C Lee
Retrieval of an associative memory can lead to different phenomena. Brief reexposure sessions tend to trigger reconsolidation, whereas more extended ones trigger extinction. In appetitive and fear cued Pavlovian memories, an intermediate "null point" period has been observed where neither process seems to be engaged. Here we investigated whether this phenomenon extends to contextual fear memory. Adult rats were subjected to a contextual fear conditioning paradigm, reexposed to the context 2 d later for 3, 5, 10, 20, or 30 min, with immediate injections of MK-801 or saline following reexposure, and tested on the following day...
September 2017: Learning & Memory
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