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https://www.readbyqxmd.com/read/29454259/the-cellular-mechanisms-and-consequences-of-centromere-drive
#1
REVIEW
Lisa E Kursel, Harmit S Malik
During female meiosis, only one of four meiotic products is retained in the egg. It was previously proposed that chromosomes might compete for inclusion in the egg via their centromere 'strength'. Recent findings have revealed the primary requirements for such 'centromere drive'. First, CDC42 signaling from the oocyte cortex renders the meiotic I spindle asymmetric. Second, 'stronger' centromeres preferentially detach from microtubules in cortical proximity, making them more likely to orient away from the cortex, and be included in the egg...
February 14, 2018: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/29453798/melatonin-protects-against-defects-induced-by-deoxynivalenol-during-mouse-oocyte-maturation
#2
Mei Lan, Jun Han, Meng-Hao Pan, Xiang Wan, Zhen-Nan Pan, Shao-Chen Sun
Deoxynivalenol (DON) is one of the most prevalent Fusarium mycotoxins in feedstuff and food. DON causes detrimental effects on human and animal reproductive systems by inducing oxidative stress and apoptosis. While melatonin is a multifunctional endogenous hormone which plays crucial roles in the development of animal germ cells and embryos as a robust deoxidizer. In present study, we explored the effects of melatonin on the DON-exposure mouse oocytes. Our in vitro and in vivo results showed that DON adversely affected mouse oocyte maturation and early embryo cleavage, while melatonin administration ameliorated the toxic effects of DON...
February 17, 2018: Journal of Pineal Research
https://www.readbyqxmd.com/read/29452297/lumbar-intraspinal-spindle-cell-rhabdomyosarcoma-as-a-rare-cause-of-spinal-stenosis-a-case-report
#3
Donel A Sequea, Maria E Reese
Rhabdomyosarcoma (RMS) represents the most common sarcoma in childhood, yet is extremely rare in adults with only a handful of cases reported. Here we present a case of intraspinal spindle cell RMS in an adult who presented as a typical case of spinal stenosis. To our knowledge, this is the first reported case of lumbar intraspinal spindle cell RMS in an adult patient. Furthermore, RMS phenotypically presents more aggressively in adults compared to children.
February 13, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29449730/ovarian-leiomyoma-with-myxoid-stroma
#4
A Moulla, N Magdy, M El-Bahrawy
Ovarian smooth muscle tumours are rare. Notable myxoid change in smooth muscle tumours is uncommon, and raises diagnostic issues that need to be considered on evaluating a spindle cell lesion with notable myxoid change. There is only one case of myxoid leiomyoma of the ovary previously reported. We here report a case of ovarian leiomyoma with areas of myxoid stroma and discuss the relevant differential diagnosis and histological features to be assessed in such a lesion.
December 2017: Pathologica
https://www.readbyqxmd.com/read/29449724/angiomyofibroblastoma-of-the-spermatic-cord-a-case-report
#5
L Bouhajja, S A Rammeh, S Sayari, R Zermani, F Farah
Angiomyofibroblastoma (AMF) is a rare benign mesenchymal tumor with tendency to arise in the lower genital tract of middleaged women, predominately in the vulva. A few cases of AMF in males have been reported involving the scrotum, perineum or spermatic cord. We report a new case of AMF arising in the right inguinal region of a 27-year-old man. The tumor was well-circumscribed, myxoid and measured 30 mm in maximum dimension. On microscopic examination, the tumor was composed of spindle cells without atypia and with less than one mitosis figure per 10 high-power fields...
December 2017: Pathologica
https://www.readbyqxmd.com/read/29449429/heterogeneous-origins-of-human-sleep-spindles-in-different-cortical-layers
#6
Donald J Hagler, Istvan Ulbert, Lucia Wittner, Lorand Erőss, Joseph R Madsen, Orrin Devinsky, Werner Doyle, Daniel Fabo, Sydney S Cash, Eric Halgren
Sleep spindles are a cardinal feature in human NREM sleep and may be important for memory consolidation. We studied the intracortical organization of spindles in men and women by recording spontaneous sleep spindles from different cortical layers using linear microelectrode arrays. Two patterns of spindle generation were identified using visual inspection, and confirmed with factor analysis. Spindles (10-16Hz) were largest and most common in upper and middle channels, with limited involvement of deep channels...
February 15, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29448469/regulating-positioning-and-orientation-of-mitotic-spindles-via-cell-size-and-shape
#7
Jingchen Li, Hongyuan Jiang
Proper location of the mitotic spindle is critical for chromosome segregation and the selection of the cell division plane. However, how mitotic spindles sense cell size and shape to regulate their own position and orientation is still largely unclear. To investigate this question systematically, we used a general model by considering chromosomes, microtubule dynamics, and forces of various molecular motors. Our results show that in cells of various sizes and shapes, spindles can always be centered and oriented along the long axis robustly in the absence of other specified mechanisms...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448071/activating-embryonic-development-in-drosophila
#8
REVIEW
Emir E Avilés-Pagán, Terry L Orr-Weaver
The transition from oocyte to embryo marks the onset of development. This process requires complex regulation to link developmental signals with profound changes in mRNA translation, cell cycle control, and metabolism. This control is beginning to be understood for most organisms, and research in the fruit fly Drosophila melanogaster has generated new insights. Recent findings have increased our understanding of the roles played by hormone and Ca 2+ signaling events as well as metabolic remodeling crucial for this transition...
February 12, 2018: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/29446864/sensitive-and-specific-guest-recognition-via-pyridinium-modification-in-spindle-like-coordination-containers
#9
Nagarajan Bhuvaneswari, Feng-Rong Dai, Zhong-Ning Chen
An elaborately designed pyridinium-functionalized octanuclear zinc(II) coordination container 1-Zn was prepared through the self-assembly of Zn2+, p-tert-butylsulfonylcalix[4]arene, and pyridinium functionalized angular flexible dicarboxylate linker (H2BrL1). The structure was determined by single crystal X-ray diffractometer. 1-Zn displays highly sensitive and specific recognition to 2-picolylamine as revealed by drastic blue-shifts of the absorption and emission spectra, ascribed to the decrease of intramolecular charge transfer (ICT) character of the container and the occurrence of intermolecular charge transfer between the host and guest molecules...
February 15, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29446843/characterization-of-ectopic-myelinated-nerve-fibers-in-the-retina-of-a-cynomolgus-monkey-macaca-fascicularis
#10
Norimitsu Shirai, Mark G Evans
We report histopathology of retinal myelination discovered in a cynomolgus monkey. It consisted of a uniform population of spindle cells arranged in fascicles within the retina at the optic disk. The present case is remarkable in that there is a paucity of reports describing myelinated retinal nerve fibers in monkeys.
February 15, 2018: Journal of Medical Primatology
https://www.readbyqxmd.com/read/29445948/intraspinal-neural-axis-abnormalities-in-severe-spinal-deformity-a-10-year-mri-review
#11
Ying Zhang, Jingming Xie, Yingsong Wang, Ni Bi, Tao Li, Jie Zhang, Zhi Zhao, Hua Ou, Siyuan Liu
PURPOSE: Documents indicated that the average prevalence of intraspinal neural axis abnormalities (INAAs) in presumed idiopathic scoliosis (PIS) patients was about 17.7%. However, paucity study focuses on the incidence of INAAs in severe spinal deformity (SSDs). In this study, we investigate the incidence of intraspinal neural axis abnormalities (IINAAs) and the clinical relevance in SSD at a single center. METHODS: All the patients with SSDs admitted for spinal surgery were evaluated from 2003 to 2014...
February 14, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29445571/immunoreactivity-of-wilms-tumor-1-wt1-as-an-additional-evidence-supporting-hemangiomatous-rather-than-inflammatory-origin-in-the-etiopathogenesis-of-angiolymphoid-hyperplasia-with-eosinophilia
#12
Fatma Tokat, Julia S Lehman, Engin Sezer, Emel Dikicioglu Cetin, Umit Ince, Emel Ozturk Durmaz
Background: Angiolymphoid hyperplasia with eosinophilia (ALHE) is a rare vascular proliferative disorder mainly located in the periauricular region. The etiopathogenesis of ALHE is unknown, and it is still controversial as to whether the entity represents a benign vascular neoplasm or an inflammatory process. Aim: Recently, the intracytoplasmic staining pattern of Wilms tumor 1 (WT1) on immunohistochemistry has highlighted true vascular neoplasms, such as microvenular hemangioma, tufted angioma, and spindle cell hemangioma, which has made it helpful to distinguish ALHE from vascular malformations, as there is a negative staining pattern in the other entities...
January 2018: Dermatology Practical & Conceptual
https://www.readbyqxmd.com/read/29445465/the-physiotherapeutic-variable-approach-technique-an-example-of-neuromotor-adaptation-conveyed-by-the-neuromuscular-spindle
#13
Maria Russo, Giuseppe Cultrera
The subcortical systems control the proper functioning of the automatic substrate required for movement. Such a substrate is often underestimated to give attention to voluntary movement. By applying Variable Approach technique, it is possible to communicate with automatic systems through muscular spindles to achieve a more functional volunteer movement.
February 2018: Clinical Case Reports
https://www.readbyqxmd.com/read/29443783/giant-gist-of-the-stomach-a-successful-case-of-safe-resection-with-preoperative-simulation-using-three-dimensional-ct-angiography-case-report
#14
Kentaro Matsuo, Masaya Inoue, Yasutsugu Shirai, Tatsuki Kataoka, Shuji Kagota, Kohei Taniguchi, Sang-Woong Lee, Kazuhisa Uchiyama
RATIONALE: We report a very rare case of safely resectable giant gastrointestinal stromal tumor (GIST) with preoperative three-dimensional computed tomography (3D-CT) angiography in spite of no neoadjuvant treatment. PATIENT'S CONCERN: A 71-year-old woman presented to our hospital with an abdominal giant tumor. As this giant tumor could not be accurately diagnosed by preoperative investigation, we had to perform her surgical treatment without neoadjuvant treatment...
February 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29443055/a-seminiferous-tubule-squash-technique-for-the-cytological-analysis-of-spermatogenesis-using-the-mouse-model
#15
Stephen R Wellard, Jessica Hopkins, Philip W Jordan
Meiotic progression in males is a process that requires the concerted action of a number of highly regulated cellular events. Errors occurring during meiosis can lead to infertility, pregnancy loss or genetic defects. Commencing at the onset of puberty and continuing throughout adulthood, continuous semi-synchronous waves of spermatocytes undergo spermatogenesis and ultimately form haploid sperm. The first wave of mouse spermatocytes undergoing meiotic initiation appear at day 10 post-partum (10 dpp) and are released into the lumen of seminiferous tubules as mature sperm at 35 dpp...
February 6, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29440916/overexpression-of-zwint-predicts-poor-prognosis-and-promotes-the-proliferation-of-hepatocellular-carcinoma-by-regulating-cell-cycle-related-proteins
#16
Hanning Ying, Zhiyao Xu, Mingming Chen, Senjun Zhou, Xiao Liang, Xiujun Cai
Introduction: Zwint, a centromere-complex component required for the mitotic spindle checkpoint, has been reported to be overexpressed in different human cancers, but it has not been studied in human hepatocellular carcinoma (HCC). Materials and methods: The role of Zwint in hepatocellular carcinoma cell proliferation capacities was evaluated by using cell counting kit-8 (CCK8), flow cytometry, clone formation and tumor formation assay in nude mice. Western blot analysis and qPCR assay were performed to assess Zwint interacting with cell-cycle-related proteins...
2018: OncoTargets and Therapy
https://www.readbyqxmd.com/read/29440567/cellular-and-molecular-mechanisms-of-centromere-drive
#17
Michael A Lampson, Ben E Black
The asymmetric outcome of female meiosis I, whereby an entire set of chromosomes are discarded into a polar body, presents an opportunity for selfish genetic elements to cheat the process and disproportionately segregate to the egg. Centromeres, the chromosomal loci that connect to spindle microtubules, could potentially act as selfish elements and "drive" in meiosis. We review the current understanding of the genetic and epigenetic contributions to centromere identity and describe recent progress in a powerful model system to study centromere drive in mice...
February 12, 2018: Cold Spring Harbor Symposia on Quantitative Biology
https://www.readbyqxmd.com/read/29439246/cyclic-mechanical-stretch-induced-smooth-muscle-cell-changes-in-cerebral-aneurysm-progress-by-reducing-collagen-type-iv-and-collagen-type-vi-levels
#18
Peixi Liu, Yaying Song, Yingjie Zhou, Yingjun Liu, Tianming Qiu, Qingzhu An, Jianping Song, Peiliang Li, Yuan Shi, Sichen Li, Kai Quan, Guo-Yuan Yang, Wei Zhu
BACKGROUND/AIMS: Cerebral aneurysm growth is characterized by continuous structural weakness of local smooth muscle cells, though the mechanism is unclear. In this study, we examine protein changes in cerebral aneurysm and human brain vascular smooth muscle cells after cyclic mechanical stretch. We further explore the relationship between the smooth muscle cell changes and reductions in the levels of collagen types IV and VI. METHODS: Saccular cerebral aneurysms (n=10) were collected, and temporal artery samples were used as controls...
February 7, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29438169/superficial-solitary-fibrous-tumor-a-series-of-26-cases
#19
Patrick Feasel, Alyaa Al-Ibraheemi, Karen Fritchie, Riyam T Zriek, Wei-Lien Wang, Elizabeth Demicco, Marcela Saeb-Lima, John R Goldblum, Brian P Rubin, Jesse K McKenney, Jennifer S Ko, Steven D Billings
While superficial (cutaneous/subcutaneous) solitary fibrous tumor (SFT) have been described, definitive diagnosis is difficult due to overlapping features with other tumors. We describe the largest series to date of superficial SFT. For inclusion, SFT had to arise in dermis or subcutis. Twenty-six cases were identified. Patients ranged from 16 to 80 years (mean, 47 y) with a marked female predominance (19 F; 7 M). Tumors involved the head (11), thigh (7), back (3), shoulder (2), upper arm (1), ankle (1), and great toe (1)...
February 12, 2018: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/29436792/wharton-s-jelly-derived-mesenchymal-stem-cells-isolation-and-characterization
#20
Hossein Ranjbaran, Saeid Abediankenari, Masoud Mohammadi, Narjes Jafari, Alireza Khalilian, Zahra Rahmani, Marzei Momeninezhad Amiri, Pirooz Ebrahimi
Wharton`s jelly-derived mesenchymal stem cells (WJ-MSCs), have a high proliferation valency and they do not produce teratogen or carcinogen after subsequent transplantation. They are known as regenerative medicine. Thus more research is needed on the isolation and characterization of mesenchymal stem cells. In this experimental study, we obtained Wharton's jelly tissues from mothers during normal vaginal delivery, after obtaining their informed consent. Mesenchymal stem cells were isolated from cultured Wharton`s jelly, cultured, and were then examined for their proliferation, immunophenotypes, and differentiation capacities...
January 2018: Acta Medica Iranica
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