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https://www.readbyqxmd.com/read/28211950/a-new-cell-cycle-checkpoint-that-senses-plasma-membrane-cell-wall-damage-in-budding-yeast
#1
Keiko Kono, Amy E Ikui
In nature, cells face a variety of stresses that cause physical damage to the plasma membrane and cell wall. It is well established that evolutionarily conserved cell cycle checkpoints monitor various cellular perturbations, including DNA damage and spindle misalignment. However, the ability of these cell cycle checkpoints to sense a damaged plasma membrane/cell wall is poorly understood. To the best of our knowledge, our recent paper described the first example of such a checkpoint, using budding yeast as a model...
February 17, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28210572/endobronchial-solitary-fibrous-tumor
#2
Cristiano Claudino Oliveira, Marcelo Padovani Toledo de Moraes, Thomas Colby, Gilmar Felisberto Oliveira, Erica Nishida Hasimoto, Daniele Cristina Cataneo, Antônio José Maria Cataneo, Julio De Faveri
Solitary fibrous tumor (SFT) is a mesenchymal neoplasm that appears primarily in the pleura and rarely in intrapulmonary or endobronchial topography. The authors report the case of a 47-year-old woman who presented obstructive respiratory symptoms for 4 years. The chest computed tomography and bronchoscopy showed an obstructive polypoid lesion located between the trachea and the left main bronchus associated with distal atelectasis of the left lung. A resection of the lesion was performed and, macroscopically, the mass was oval, encapsulated, and firm, measuring 2...
October 2016: Autopsy & case reports
https://www.readbyqxmd.com/read/28210430/growth-kinetics-and-characterization-of-human-dental-pulp-stem-cells-comparison-between-third-molar-and-first-premolar-teeth
#3
Davood Mehrabani, Parisa Mahdiyar, Kianoosh Torabi, Reza Robati, Shahrokh Zare, Mehdi Dianatpour, Amin Tamadon
BACKGROUND: Dental pulp stem cells (DPSCs) play an important role in tissue regeneration. This study compares the growth kinetics and characterization of third molar and first premolar human DPSCs. MATERIAL AND METHODS: Dental pulp tissues were isolated from human first premolar and third molar teeth and were digested by treating them with collagenase type I. Single-cell suspensions from each dental pulp were seeded in T25 culture flasks and the media were replaced every 3 days until 70% confluence...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28210409/primary-leiomyosarcoma-of-the-mandibular-alveolar-mucosa-of-a-12-year-old-child-from-ethiopia-a-case-report
#4
Tewodros Tefera Kenea, Betel Abebe Kebede, Fekadu Mesele Gozjuze, Hagos Kiros, Frank Wilde
Leiomyosarcomas (LMSs) are rare malignant mesenchymal tumors which show smooth-muscle differentiation. Most LMSs involving the oral tissues primarily affect the maxillary sinus, the maxillary or mandibular bone. We present a case of LMS of the mandibular alveolar mucosa, arising in a 12-year-old male child from Ethiopia. A malignant spindle cell-like neoplasm was diagnosed on clinical and radiographic findings as well as on incisional biopsy. The tumor was resected with wide margins. The following histopathologic examination with additional immunohistochemical studies secured the diagnosis LMS...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28209915/exclusive-destruction-of-mitotic-spindles-in-human-cancer-cells
#5
Leonid Visochek, Asher Castiel, Leonid Mittelman, Michael Elkin, Dikla Atias, Talia Golan, Shai Izraeli, Tamar Peretz, Malka Cohen-Armon
We identified target proteins modified by phenanthrenes that cause exclusive eradication of human cancer cells. The cytotoxic activity of the phenanthrenes in a variety of human cancer cells is attributed by these findings to post translational modifications of NuMA and kinesins HSET/kifC1 and kif18A. Their activity prevented the binding of NuMA to α-tubulin and kinesins in human cancer cells, and caused aberrant spindles. The most efficient cytotoxic activity of the phenanthridine PJ34, caused significantly smaller aberrant spindles with disrupted spindle poles and scattered extra-centrosomes and chromosomes...
February 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28208958/radiological-and-histopathological-outcome-of-giant-cell-tumor-of-femur-with-denosumab-treatment-a-case-report
#6
Preethi Dileep Menon, R Krishnakumar, Annie Jojo
Giant Cell Tumour of Bone (GCTB) is a benign but locally aggressive osteolytic skeletal neoplasm of young adults consisting of giant cells expressing RANK (Receptor Activator of Nuclear Factor-κB) and mesenchymal spindle-like stromal cells expressing RANKL (RANK ligand). The interaction of these cells leads to bone resorption. Recently, the RANKL inhibitor, denosumab, has demonstrated activity against giant-cell tumours. The current article reports a case of a Giant cell tumour of left distal femur with pathological fracture...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28206974/caffeine-delays-oocyte-aging-and-maintains-the-quality-of-aged-oocytes-safely-in-mouse
#7
Xia Zhang, Xiaoyan Liu, Li Chen, Dan-Ya Wu, Zheng-Wen Nie, Ying-Ying Gao, Yi-Liang Miao
Caffeine, as an oocyte aging inhibitor, was used in many different species to control or delay oocyte aging. However, the safety of caffeine and developmental competence of aged oocytes inhibited by caffeine has not been studied systematically. So we detected the spindle morphology, distribution of cortical granules, zona pellucida hardening and pronucleus formation to assess oocyte quality of caffeine treated oocytes. We found that aged oocytes treated by caffeine maintained weak susceptibility to activating stimuli and regained normal competent after aged further 6 hr...
February 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28203428/multiple-cavitating-pulmonary-nodules-rare-manifestation-of-benign-metastatic-leiomyoma
#8
Sa Ra Lee, Youn-I Choi, Seok Jeong Lee, Sung Shine Shim, Jin Hwa Lee, Yoo Kyung Kim, Soon Hee Sung
Benign metastasizing leiomyoma (BML) is a rare disease of pathologically benign, but the tumor metastasizes to other organs. The most common organ involved in BML is lung. Pulmonary involvement usually manifested as multiple nodules on chest X-ray, however we experienced an interesting case of a 52-year-old premenopausal woman who presented with multiple bilateral lung cavitations and nodules on a chest X-ray without any respiratory symptoms. Chest computed-tomography identified multiple cavitary lesions of 5-12 mm in diameter and well-defined nodules of 5-10 mm in diameter in both lung fields...
January 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28202998/-comparative-study-of-proliferative-and-periodontal-differentiation-propensity-of-induced-pluripotent-stem-cells-at-different-passages
#9
J W Li, X H Yin, Q X Luan
OBJECTIVE: To compare the proliferative and periodontal specific differentiation abilities of induced pluripotent stem cells (iPSCs) at different passages, and to investigate whether long term culturing would have a negative influence on their proliferation and specific differentiation capacity, thus providing a theoretical basis for further in-depth research on periodontal regeneration and the possible clinical applications of iPSCs. METHODS: IPSCs derived from human gingival fibroblasts at passages 5, 10, 15 and 20 were recovered and cultured in vitro...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28202730/liquid-behavior-of-cross-linked-actin-bundles
#10
Kimberly L Weirich, Shiladitya Banerjee, Kinjal Dasbiswas, Thomas A Witten, Suriyanarayanan Vaikuntanathan, Margaret L Gardel
The actin cytoskeleton is a critical regulator of cytoplasmic architecture and mechanics, essential in a myriad of physiological processes. Here we demonstrate a liquid phase of actin filaments in the presence of the physiological cross-linker, filamin. Filamin condenses short actin filaments into spindle-shaped droplets, or tactoids, with shape dynamics consistent with a continuum model of anisotropic liquids. We find that cross-linker density controls the droplet shape and deformation timescales, consistent with a variable interfacial tension and viscosity...
February 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28202691/attenuation-of-n-glycosylation-causes-polarity-and-adhesion-defects-in-the-c-elegans-embryo
#11
Julia Stevens, Anne Spang
The C. elegans early embryo is highly polarized, requiring sequestration of cytoplasmic polarity factors at the plasma membrane. This compartmentalization aids asymmetric distribution of lipids and proteins, which is partially responsible for the fates of the daughter cells. Since most plasma membrane proteins are glycosylated, we determined the effect of N-glycosylation attenuation on cell polarity. While polarity establishment was not perturbed, the AB/P1 size ratio was more variable in embryos with reduced N-glycosylation than in the mock-treated ones...
February 15, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28202658/mechanisms-for-nonmitotic-activation-of-aurora-a-at-cilia
#12
REVIEW
Vladislav Korobeynikov, Alexander Y Deneka, Erica A Golemis
Overexpression of the Aurora kinase A (AURKA) is oncogenic in many tumors. Many studies of AURKA have focused on activities of this kinase in mitosis, and elucidated the mechanisms by which AURKA activity is induced at the G2/M boundary through interactions with proteins such as TPX2 and NEDD9. These studies have informed the development of small molecule inhibitors of AURKA, of which a number are currently under preclinical and clinical assessment. While the first activities defined for AURKA were its control of centrosomal maturation and organization of the mitotic spindle, an increasing number of studies over the past decade have recognized a separate biological function of AURKA, in controlling disassembly of the primary cilium, a small organelle protruding from the cell surface that serves as a signaling platform...
February 8, 2017: Biochemical Society Transactions
https://www.readbyqxmd.com/read/28202332/cdc20-at-the-crossroads-between-chromosome-segregation-and-mitotic-exit
#13
REVIEW
Maria Kapanidou, Natalie L Curtis, Victor M Bolanos-Garcia
Cell-division cycle protein 20 homologue (Cdc20) has important functions in chromosome segregation and mitotic exit. Cdc20 is the target of the spindle assembly checkpoint (SAC) and a key cofactor of the anaphase-promoting complex or cyclosome (APC/C) E3 ubiquitin ligase, thus regulating APC/C ubiquitin activity on specific substrates for their subsequent degradation by the proteasome. Here we discuss the roles of Cdc20 in SAC signalling and mitotic exit, describe how the integration of traditional approaches with emerging technologies has revealed new details of Cdc20 functions, comment about the potential of Cdc20 as a therapeutic target for the treatment of human malignancies, and discuss recent advances and controversies in the mechanistic understanding of the control of chromosome segregation during cell division...
February 12, 2017: Trends in Biochemical Sciences
https://www.readbyqxmd.com/read/28199084/novel-cell-inorganic-hybrid-catalytic-interfaces-with-enhanced-enzymatic-activity-and-stability-for-sensitive-biosensing-of-paraoxon
#14
Lei Han, Aihua Liu
To improve the biosensing performance of organophosphorus hydrolase (OPH), the novel bioinorganic hybrid catalysts were facilely explored by biomineralization and cell surface display technology. During biomineralization, cobalt phosphate crystals were deposited onto the surface of OPH-fused bacteria, and the inorganic crystals at middle of cell collapsed inwardly to form the final spindle morphology because of the lowest energy principle and the mechanics principle. OPH would show the allosteric effect from "inactive" form to "active" form, and the "active" form was "fixed" when OPH was embedded into cobalt phosphate...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28197724/histological-and-immunohistochemical-characteristics-of-undifferentiated-small-round-cell-sarcomas-associated-with-cic-dux4-and-bcor-ccnb3-fusion-genes
#15
Yuichi Yamada, Masaaki Kuda, Kenichi Kohashi, Hidetaka Yamamoto, Junkichi Takemoto, Takeaki Ishii, Kunio Iura, Akira Maekawa, Hirofumi Bekki, Takamichi Ito, Hiroshi Otsuka, Makoto Kuroda, Yumi Honda, Shinji Sumiyoshi, Takeshi Inoue, Naoe Kinoshita, Atsushi Nishida, Kyoko Yamashita, Ichiro Ito, Shizuo Komune, Tomoaki Taguchi, Yukihide Iwamoto, Yoshinao Oda
CIC-DUX4 and BCOR-CCNB3 fusion-gene-associated small round cell sarcomas account for a proportion of pediatric small round cell sarcomas, but their pathological features have not been sufficiently clarified. We reviewed a large number of soft tissue tumors registered at our institution, retrieved the cases of unclassified tumors with a small round cell component, and subjected them to histopathological, immunohistochemical, and gene profile analysis. We reviewed 164 cases of unclassified tumors with a small round cell component and analyzed them by RT-PCR and FISH...
February 14, 2017: Virchows Archiv: An International Journal of Pathology
https://www.readbyqxmd.com/read/28197348/angioimmunoblastic-t-cell-lymphoma-a-questionable-association-with-follicular-dendritic-cell-sarcoma
#16
Daniel Benharroch, Miriam Zekzer, Karen Nalbandyan
An elderly woman presented with generalized lymphadenopathy, several systemic symptoms, and splenomegaly. An inguinal lymph node excision revealed a compound picture. One aspect of the lymph node morphology, including cells with follicular T-helper cell phenotype, was most consistent with angioimmunoblastic T-cell lymphoma. The other component, revealing spindle cells forming whorls with immunostaining for CD21, CD23, and fascin, might be an integral part of this T-cell lymphoma. However, due to the often massive involvement of the nodal tissue by these follicular dendritic cells, these areas were questionably suggestive of involvement by follicular dendritic cell sarcoma...
2017: Case Reports in Hematology
https://www.readbyqxmd.com/read/28195839/carbamazepine-toxicity-induced-spindle-coma-a-novel-case-report
#17
Bhumir Chauhan, Amitkumar Patanvadiya, Gopal Krishna Dash
A 9-year-old girl presented with alleged history of deliberate ingestion of 4 g of carbamazepine, following which she became comatose. A bedside electroencephalogram (EEG) was performed to rule out nonconvulsive status epilepticus, which showed presence of spindle coma (SC), not reactive to noxious stimuli. Following hemodialysis, a second EEG showed absence of SC and complete clinical recovery. We present this unique case of carbamazepine-induced SC, thereby highlighting the extent of the etiologic spectrum of SC and discussing the literature related to this association...
February 13, 2017: Clinical Neuropharmacology
https://www.readbyqxmd.com/read/28195246/cellular-fibroma-in-the-douglas-cavity-mimicking-a-malignant-neoplasia-fibroma-fibrosarcoma-or-mitotically-active-cellular-fibroma
#18
A Di Lorito, P Viola, S Rosini, G Lattanzio
INTRODUCTION: Ovarian fibroma is a benign stromal tumour composed of spindle/ovoid fibroblastic cells producing collagen. Approximally 10% of fibromas are densely cellular with small amount of collagen. In these cases, if mild nuclear atypia is present, they are best addressed as cellular fibroma. However cellular fibroma may show a greater mitotic activity and therefore they should be referred as mitotically active cellular fibromas. Mostly benign, it is necessary to differentiate them from malignant tumours such as fibrosarcomas...
March 2016: Pathologica
https://www.readbyqxmd.com/read/28194713/use-of-compressive-osseointegration-endoprostheses-for-massive-bone-loss-from-tumor-and-failed-arthroplasty-a-viable-option-in-the-upper-extremity
#19
Krista A Goulding, Adam Schwartz, Steven J Hattrup, R Lor Randall, Donald Lee, Damian M Rispoli, Daniel M Lerman, Christopher Beauchamp
BACKGROUND: Endoprostheses using principles of compressive osseointegration have shown good survivorship in several studies involving the lower extremity; however, no series to our knowledge have documented the use of this technology in the management of massive bone loss in the upper limb. QUESTIONS/PURPOSES: (1) What proportion of upper extremity implants using compressive osseointegration fixation principles achieved durable short-term fixation, and what were the modes of failure? (2) What surgical complications resulted from reconstruction using this technique? METHODS: A multiinstitutional retrospective review identified nine patients (five women; four men) who underwent 13 endoprosthetic replacements between 2003 and 2014 using compressive osseointegration (Compliant(®) Pre-stress Device [CPS]; Biomet Inc, Warsaw, IN, USA) in the upper extremity, including two proximal humeri, two humeral diaphyses, seven distal humeri, and two proximal ulna...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28194098/spatiotemporal-profiles-of-proprioception-processed-by-the-masseter-muscle-spindles-in-rat-cerebral-cortex-an-optical-imaging-study
#20
Satoshi Fujita, Mari Kaneko, Hiroko Nakamura, Masayuki Kobayashi
Muscle spindles in the jaw-closing muscles, which are innervated by trigeminal mesencephalic neurons (MesV neurons), control the strength of occlusion and the position of the mandible. The mechanisms underlying cortical processing of proprioceptive information are critical to understanding how sensory information from the masticatory muscles regulates orofacial motor function. However, these mechanisms are mostly unknown. The present study aimed to identify the regions that process proprioception of the jaw-closing muscles using in vivo optical imaging with a voltage-sensitive dye in rats under urethane anesthesia...
2017: Frontiers in Neural Circuits
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