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https://www.readbyqxmd.com/read/28526561/mitochondrial-contact-site-and-cristae-organizing-system-a-central-player-in-membrane-shaping-and-crosstalk
#1
Florian Wollweber, Karina von der Malsburg, Martin van der Laan
Mitochondria are multifunctional metabolic factories and integrative signaling organelles of eukaryotic cells. The structural basis for their numerous functions is a complex and dynamic double-membrane architecture. The outer membrane connects mitochondria to the cytosol and other organelles. The inner membrane is composed of a boundary region and highly folded cristae membranes. The evolutionarily conserved mitochondrial contact site and cristae organizing system (MICOS) connects the two inner membrane domains via formation and stabilization of crista junction structures...
May 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28515484/the-complex-tibial-organ-of-the-new-zealand-ground-weta-sensory-adaptations-for-vibrational-signal-detection
#2
Johannes Strauß, Kathryn Lomas, Laurence H Field
In orthopteran insects, a complex tibial organ has evolved to detect substrate vibrations and/or airborne sound. Species of New Zealand weta (Anostostomatidae) with tympanal ears on the foreleg tibia use this organ to communicate by sound, while in atympanate species (which communicate by substrate drumming) the organ is unstudied. We investigated the complex tibial organ of the atympanate ground weta, Hemiandrus pallitarsis, for vibration detection adaptations. This system contains four sensory components (subgenual organ, intermediate organ, crista acustica homolog, accessory organ) in all legs, together with up to 90 scolopidial sensilla...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28513781/mitochondria-rich-cells-changes-induced-by-nitrite-exposure-in-tambaqui-colossoma-macropomum-cuvier-1818
#3
Oscar T F DA Costa, Cleverson A Ramos, Wallice P Duncan, Juliana L V Lameiras, Marisa N Fernandes
The gill mitochondria-rich cells of the juvenile Amazonian fish Colossoma macropomum were analyzed using light and scanning and transmission electron microscopy after 96 h exposure to 0.04 and 0.2 mM nitrite. Although the number of mitochondria-rich cells decreased significantly in the lamellar epithelium, no decrease was found in the interlamellar region of the gill filament. Nitrite exposure caused significant reduction on the apical surface area of individual mitochondria-rich cells (p < 0.05), with a resulting reduction of the fractional area of these cells in both the lamellar and filament epithelium...
May 15, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28500280/visualization-of-a-mammalian-mitochondrion-by-coherent-x-ray-diffractive-imaging
#4
Yoonhee Kim, Chan Kim, Ou Young Kwon, Daewoong Nam, Sang Soo Kim, Jae Hyun Park, Sunam Kim, Marcus Gallagher-Jones, Yoshiki Kohmura, Tetsuya Ishikawa, Changyong Song, Giyoong Tae, Do Young Noh
We report a three dimensional (3D) quantitative visualization of a mammalian mitochondrion by coherent x-ray diffractive imaging (CXDI) using synchrotron radiation. The internal structures of a mitochondrion from a mouse embryonic fibroblast cell line (NIH3T3) were visualized by tomographic imaging at approximately 60 nm resolution without the need for sectioning or staining. The overall structure consisted of a high electron density region, composed of the outer and inner membranes and the cristae cluster, which enclosed the lower density mitochondrial matrix...
May 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28499702/prespermatogenesis-and-early-spermatogenesis-in-frogs
#5
Katarzyna Haczkiewicz, Beata Rozenblut-Kościsty, Maria Ogielska
Spermatogenesis in frogs was for the first time divided into two phases: prespermatogenesis, when gonocytes proliferate in developing tadpole testes, and active spermatogenesis when spermatogonial stem cells (i.e. descendants of gonocytes), either self-renew or enter into meiotic cycles within cysts formed by Sertoli cells. We argue that amphibian larval gonocytes are homologues to mammalian gonocytes, whereas spermatogonial stem cells (SSCs) in adult frogs are homologous to mammalian single spermatogonia (As)...
March 12, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28496033/joint-toxicity-of-fluoroquinolone-and-tetracycline-antibiotics-to-zebrafish-danio-rerio-based-on-biochemical-biomarkers-and-histopathological-observation
#6
Lihe Ding, Luxiu Zang, Yuna Zhang, Yuhuan Zhang, Xuedong Wang, Weiming Ai, Nani Ding, Huili Wang
Herein, we report on the joint toxicity of four fluoroquinolones and two tetracyclines (β-diketone antibiotics-DKAs) to zebrafish based on a series of toxicological endpoints and histopathological observations. A positive dose-dependence was observed in DKA-exposure groups with a 72-hpf EC50 of 130.3 mg/L for hatching rate, 120-hpf LC50 of 149.8 mg/L, and 120-hpf EC50 of 135.1 mg/L for malformation rate. When zebrafish at 60 dpf were exposed to a series of DKA concentrations (45, 60 and 90 mg/L) for 7, 14 and 21 days, creatine kinase and AChE activities were significantly induced, and intracellular malondialdehyde increased in all treatments except for the 45 mg/L treatment...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28494212/retinal-toxicity-of-acai-fruit-euterpe-oleracea-dye-concentrations-in-rabbits-basic-principles-of-a-new-dye-for-chromovitrectomy-in-humans
#7
Rafael R Caiado, Cristiane S Peris, Acácio Alves Souza Lima-Filho, Joao Guilherme Palma Urushima, Eduardo Novais, Emmerson Badaró, André Maia, Rita Sinigaglia-Coimbra, Sung Eun S Watanabe, Eduardo B Rodrigues, Michel Eid Farah, Mauricio Maia
PURPOSE: Evaluate toxicity of acai fruit (Euterpe oleracea) dye concentrations in a rabbit model. METHODS: Rabbits were injected intravitreously with 10%, 25%, and 35% acai dye concentrations. Control eyes received balanced salt solution (BSS). Electroretinogram (ERG), fundus imaging, fluorescein angiography (FA), optical coherence tomography (OCT), and light and transmission electron microscopy (LM/TEM) were performed. RESULTS: Fundus imaging showed increased vitreous opacity with increased dye concentrations...
May 11, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28489172/laparoscopic-repair-of-lumbar-hernia-grynfelt-technical-description
#8
Christiano Marlo Paggi Claus, Lucas Thá Nassif, Yan Sacha Aguilera, EduardoJose Brommelstroet Ramos, Julio Cesar Uili Coelho
Background: Lumbar hernias are rare. Usually manifest with reducible volume increase in the post-lateral region of the abdomen and may occur in two specific anatomic defects: the triangles of Grynfelt (upper) and Petit (lower). Despite controversies with better repair, laparoscopic approach, following the same principle of the treatment of inguinal hernias, seems to present significant advantages compared to conventional/open surgeries. However, some technical and anatomical details of the region, non usual to general surgeons, are fundamental for proper repair...
January 2017: Arquivos Brasileiros de Cirurgia Digestiva: ABCD, Brazilian Archives of Digestive Surgery
https://www.readbyqxmd.com/read/28486138/the-effects-of-titanium-dioxide-nanoparticles-on-ultrastructure-of-zebrafish-testis-danio-rerio
#9
Tuğba Kotil, Cansu Akbulut, Nazan Deniz Yön
INTRODUCTION: Nanotechnology investigates materials at nanoscale level (0.1-100nm in diameter). There are many commercially nanoproducts such as silver, silicon, titanium, zinc, and gold. They are used in a variety of applications and released to the environment. Titanium dioxide (TiO2) is one of the most commonly used nanoparticles (NP). In this study, the ultrastructural effects of TiO2-NP on zebrafish testis tissue were evaluated. MATERIAL AND METHOD: Zebrafish were divided into four groups (N=60) as one control and 3 experimental groups (1mg/L, 2mg/L and 4mg/L TiO2)...
April 26, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28473432/median-philtrum-sinus-a-rare-presentation-and-review-of-management-options
#10
Matthew Ming Kei Kwok, Paul Paddle
Nasal dermoids are rare congenital abnormalities, and there is only one previously reported case of a philtrum sinus tract extending to the skull base. A 2-month-old boy was presented with an incidental finding of a median philtrum sinus with no infective features and no other abnormal clinical findings. MRI demonstrated a sinus tract extending from the philtrum to the crista galli. On multidisciplinary review, a conservative approach was taken due to the asymptomatic nature of the patient. Given the rarity of nasal dermoids, diagnosis requires precise clinical examination and MRI to identify the extent of the tract...
May 4, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28468215/conchae-bullosis-in-a-pediatric-patient
#11
Omer Erdur, Kayhan Ozturk, Ceren Aksoy
Pneumatization of the turbinates called concha bullosa is one of the most frequent anatomic variations of the nasal cavity. We report the first case of computed tomography findings of bilateral middle and inferior concha bullosa in a 13-year-old child with nasal obstruction. Here we describe a patient with extreme bilateral bullosa of inferior and middle conchas, as well as crista galli. The patient was treated successfully with endoscopic surgery of conchas. Nasal obstruction secondary to a bilateral turbinate bullosis in a child has not been described before...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28463800/standardized-polyalthia-longifolia-leaf-extract-plme-inhibits-cell-proliferation-and-promotes-apoptosis-the-anti-cancer-study-with-various-microscopy-methods
#12
Soundararajan Vijayarathna, Yeng Chen, Jagat R Kanwar, Sreenivasan Sasidharan
Over the years a number of microscopy methods have been developed to assess the changes in cells. Some non-invasive techniques such as holographic digital microscopy (HDM), which although does not destroy the cells, but helps to monitor the events that leads to initiation of apoptotic cell death. In this study, the apoptogenic property and the cytotoxic effect of P. longifolia leaf methanolic extract (PLME) against the human cervical carcinoma cells (HeLa) was studied using light microscope (LM), holographic digital microscopy (HDM), scanning electron microscope (SEM) and transmission electron microscope (TEM)...
April 29, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28459400/-effects-of-hydrogen-sulfide-on-mitochondria-of-lung-in-rats-with-ali-induced-by-lipopolysaccharide
#13
Quansheng Du, Meng Zhang, Guofeng Li, Chao Wang, Nan Zhang, Jianxin Zhang
OBJECTIVE: To observe the effects of hydrogen sulfide (H2S) on structure and function of mitochondria of lung in rats with acute lung injury (ALI) induced by lipopolysaccharide (LPS). METHODS: Forty healthy male Sprague-Dawley (SD) rats were randomly divided into control group, LPS injury group, and low-, middle-, and high-dose NaHS groups, with 8 rats in each group. The rats in LPS injury group were given LPS 5 mg/kg via sublingual vein, and those in low-, middle-, and high-dose NaHS groups were challenged by LPS for 3 hours followed by intraperitoneally injection of 0...
January 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28459396/-mechanical-ventilation-leads-to-remodeling-of-diaphragma-and-soleus-in-rats
#14
Lei Shao, Zhifang Wang, Feifei Wang, Jiaru Huang, Xiaoping Zhu
OBJECTIVE: To investigate the structural response of diaphragm and soleus of the rat after mechanical ventilation (MV), and to explore the specific mechanism of the dysfunction of both muscles. METHODS: Sixteen male Sprague-Dawley (SD) rats were randomly divided into control group and MV group, with 8 rats in each group. Rats in MV group were treated with controlled ventilation and maintained anesthesia, and those in control group were only anesthetized without MV and maintained anesthesia...
January 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28438601/who-and-how-in-the-regulation-of-mitochondrial-cristae-shape-and-function
#15
R Quintana-Cabrera, A Mehrotra, G Rigoni, M E Soriano
Mitochondrial adaptation to different physiological conditions highly relies on the regulation of mitochondrial ultrastructure, particularly at the level of cristae compartment. Cristae represent the membrane hub where most of the respiratory complexes embed to account for OXPHOS and energy production in the form of adenosine triphosphate (ATP). Changes in cristae number and shape define the respiratory capacity as well as cell viability. The identification of key regulators of cristae morphology and the understanding of their contribution to the mitochondrial ultrastructure and function have become an strategic goal to understand mitochondrial disorders and to exploit as therapeutic targets...
April 21, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28436948/mitochondrial-elongation-mediated-glucose-metabolism-reprogramming-is-essential-for-tumour-cell-survival-during-energy-stress
#16
J Li, Q Huang, X Long, X Guo, X Sun, X Jin, Z Li, T Ren, P Yuan, X Huang, H Zhang, J Xing
To date, mechanisms of tumour cell survival under energy stress are not well understood. Cumulative evidence is beginning to reveal that specific mitochondrial morphologies are often associated with energetic states and survival of cells. However, the functional roles of mitochondria in the metabolic adaptation of tumour cells to energy stress remain to be elucidated. In this study, we first investigated the changes in mitochondrial morphology induced by nutrition deprivation in tumour cells, and the underlying molecular mechanism...
April 24, 2017: Oncogene
https://www.readbyqxmd.com/read/28436246/histopathologic-changes-of-human-vestibular-epithelia-in-intralabyrinthine-hemorrhage
#17
Serdar Kaya, Michael M Paparella, Sebahattin Cureoglu
OBJECTIVE: To determine whether intralabyrinthine hemorrhage affects vestibular hair cells, dark cells, and transitional cells in human temporal bones. METHODS: We examined 9 temporal bone specimens from 9 deceased donors with unilateral intralabyrinthine hemorrhage (the hemorrhage group) along with their 9 contralateral temporal bone specimens without hemorrhage (the control group). We estimated the density of type I and type II hair cells in all peripheral sensorial organs (including the cristae of the superior, lateral, and posterior semicircular canals, as well as the maculae of the saccule and utricle)...
June 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28430271/theoretical-modulation-of-singlet-triplet-chemiexcitation-of-chemiluminescent-imidazopyrazinone-dioxetanone-via-c8-substitution
#18
L Pinto da Silva, C M Magalhães, D M A Crista, J C G Esteves da Silva
Coelenterazine, a member of the imidazopyrazinone class of chemiluminescent substrates, presents significant potential as a dynamic probe of reactive oxygen species in a biological environment, such as a superoxide anion, in which these species are important in cellular biology and pathology. The objective of the current study was to understand in what way the efficiency of singlet and triplet chemiexcitation could be modulated, towards a more efficient use of imidazopyrazinone-based compounds as dynamic chemiluminescent probes...
April 21, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28429074/ultrastructure-of-pheochromocytoma-undescribed-morphologic-features
#19
A Beiras Fernandez, A Kornberger, M Fraga, C F Vahl, A Beiras
We examined samples of human pheochromocytoma from 11 patients aged 30-70 years including one case of malignant pheochromocytoma with a view to identifying previously unreported ultrastructural details.We identified two types of nuclear inclusions consisting of irregularly shaped singular or multiple granulofibrillar formations with a typical concentric halo, on the one hand, and accumulations of egg-shaped structures consisting of granules and microfilaments, on the other. In some of the tumor cells, membrane-covered inclusions containing parallel laminar elements arranged in a paracrystalline, periodic fashion, or mega-mitrochondriae characterized by increased electrodensity of their matrix, and fibrillary material in the spaces between the cristae were present...
April 20, 2017: Virchows Archiv: An International Journal of Pathology
https://www.readbyqxmd.com/read/28418357/-renal-morphological-changes-in-experimental-oxalate-nephrolithiasis
#20
Yu G Motin, A V Lepilov, P M Larionov
AIM: Тo evaluate renal morphological changes in the early stages of lithogenic processes and during urinary correction of urine with oxalate-chelating compounds (sodium citrate). MATERIAL AND METHODS: An experimental model of oxalate nephrolithiasis was performed on 80 male Wistar rats weighing 180 to 250 g. Rat kidneys were morphologically and ultrastructurally studied. Immunohistochemical techniques were applied to study the features of development of endoplasmic reticulum stress...
2017: Arkhiv Patologii
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