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https://www.readbyqxmd.com/read/28647693/recognition-investigation-and-management-of-mitochondrial-disease
#1
REVIEW
James E Davison, Shamima Rahman
Mitochondria are dynamic organelles present in virtually all human cells that are needed for a multitude of cellular functions, including energy production, control of cell apoptosis and numerous biochemical catabolic and synthetic pathways that are critical for cellular health. Primary mitochondrial disorders are a group of greater than 200 single gene defects arising from two genomes (nuclear and mitochondrial) leading to mitochondrial dysfunction, and are associated with extremely heterogeneous phenotypes...
June 24, 2017: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/28647616/photodynamic-therapy-in-dermatology-beyond-non-melanoma-cancer-an-update
#2
REVIEW
Xiang Wen, Yong Li, Michael R Hamblin
Photodynamic therapy (PDT) employs a photosensitizer (PS) and visible light in the presence of oxygen, leading to production of cytotoxic reactive oxygen species, which can damage the cellular organelles and cause cell death. In dermatology PDT has usually taken the form of topical application of a precursor in the heme biosynthesis pathway, called 5-aminolevulinic acid (or its methyl ester), so that an active PS, protoporphyrin IX accumulates in the skin. As PDT enhances dermal remodeling and resolves chronic inflamation, it has been used to treat cutaneous disorders include actinic keratoses, acne, viral warts, skin rejuvenation, psoriasis, localized scleroderma, some non-melanoma skin cancers and port-wine stains...
June 21, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28647358/mitochondria-associated-membranes-mams-an-emerging-platform-connecting-energy-and-immune-sensing-to-metabolic-flexibility
#3
Jennifer Rieusset
Living organisms have the capacity to sense both nutrients and immune signals in order to adapt their metabolism to the needs, and both metabolic inflexibility and exacerbated immune responses are associated with metabolic diseases. Over the past decade, mitochondria emerged as key nutrient and immune sensors regulating numerous signalling pathways, and mitochondria dysfunction has been extensively implicated in metabolic diseases. Interestingly, mitochondria interact physically and functionally with the endoplasmic reticulum (ER, in contact sites named mitochondria-associated membranes (MAMs), in order to exchange metabolites and calcium and regulate cellular homeostasis...
June 21, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28647060/lipid-droplets-can-spontaneously-bud-off-from-a-symmetric-bilayer
#4
François Deslandes, Abdou Rachid Thiam, Lionel Forêt
Lipid droplets (LDs) are cytosolic organelles that protrude from the endoplasmic reticulum membrane under energy-rich conditions. How an LD buds off from the endoplasmic reticulum bilayer is still elusive. By using a continuous media description, we computed the morphology of a lipid droplet embedded in between two identical monolayers of a bilayer. We found that beyond a critical volume, the droplet morphology abruptly transits from a symmetrical elongated lens to a spherical protrusion. This budding transition does not require any energy-consuming machinery, or curvature-inducing agent, or intrinsic asymmetry of the bilayer; it is solely driven by the large interfacial energy of the LD, as opposed to the bilayer surface tension...
June 21, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28646629/mechanisms-of-inhibitory-effects-of-polycyclic-aromatic-hydrocarbons-in-the-photosynthetic-primary-processes-in-pea-leaves-and-thylakoid-preparations
#5
V D Kreslavski, M Brestic, S K Zharmukhamedov, V Yu Luybimov, A V Lankin, A Jajoo, S I Allakhverdiev
Inhibitory effects of Polycyclic aromatic hydrocarbons on plants is studied in pea leaves in order to elucidate the mechanisms of action of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene (Naph) and phenanthrene (Phen) on activity of photosystem 2 (PS-2). The changes in different Chl fluorescence parameters were calculated on the basis of Chl fluorescence induction curves. Hydrogen peroxide content was measured in leaf homogenates by luminol-dependent chemiluminescence method. We demonstrated that due to PAH treatment, the total energy dissipation (DI0 /ABS) and amount of QB -non-reducing complexes of PS-2 significantly increased...
June 24, 2017: Plant Biology
https://www.readbyqxmd.com/read/28646303/three-dimensional-fine-structure-of-the-organization-of-microtubules-in-neurite-varicosities-by-ultra-high-voltage-electron-microscope-tomography
#6
Tomoki Nishida, Ryoichi Yoshimura, Yasuhisa Endo
Neurite varicosities are highly specialized compartments that are involved in neurotransmitter/ neuromodulator release and provide a physiological platform for neural functions. However, it remains unclear how microtubule organization contributes to the form of varicosity. Here, we examine the three-dimensional structure of microtubules in varicosities of a differentiated PC12 neural cell line using ultra-high voltage electron microscope tomography. Three-dimensional imaging showed that a part of the varicosities contained an accumulation of organelles that were separated from parallel microtubule arrays...
June 23, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28646090/cellular-functions-of-wasp-family-proteins-at-a-glance
#7
REVIEW
Olga Alekhina, Ezra Burstein, Daniel D Billadeau
Proteins of the Wiskott-Aldrich syndrome protein (WASP) family function as nucleation-promoting factors for the ubiquitously expressed Arp2/3 complex, which drives the generation of branched actin filaments. Arp2/3-generated actin regulates diverse cellular processes, including the formation of lamellipodia and filopodia, endocytosis and/or phagocytosis at the plasma membrane, and the generation of cargo-laden vesicles from organelles including the Golgi, endoplasmic reticulum (ER) and the endo-lysosomal network...
June 23, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28645217/microtubule-organizing-centers
#8
Jingchao Wu, Anna Akhmanova
The organization of microtubule networks is crucial for controlling chromosome segregation during cell division, positioning, and transport of different organelles and for cell polarity and morphogenesis. The geometry of microtubule arrays strongly depends on the localization and activity of the sites where microtubules are nucleated and where their minus ends are anchored. Such sites are often clustered into structures known as microtubule-organizing centers, which include the centrosomes in animals and spindle pole bodies in fungi...
June 23, 2017: Annual Review of Cell and Developmental Biology
https://www.readbyqxmd.com/read/28645028/lipid-homeostasis-and-regulated-cell-death
#9
REVIEW
Eran Agmon, Brent R Stockwell
Modern lipidomics analysis paints a dynamic picture of membrane organizations, as changing and adapting lipid assemblies that play an active role in cellular function. This article highlights how the lipid composition of membranes determines specific organelle functions, how homeostatic mechanisms maintain these functions by regulating physical properties of membranes, and how cells disrupt lipid homeostasis to bring about regulated cell death (RCD). These are broad phenomena, and representative examples are reviewed here...
June 20, 2017: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/28644025/a-mitochondria-targeted-cryptocyanine-based-photothermogenic-photosensitizer
#10
Hyo Sung Jung, Jae Hong Lee, Kyutae Kim, Seyoung Koo, Peter Verwilst, Jonathan L Sessler, Chulhun Kang, Jong Seung Kim
Cryptocyanine-based probes exhibit highly efficient photothermal conversion and represent a new class of photothermal agents for use in photothermal therapy (PTT). With the thermal susceptibility of mitochondria in mind, we have prepared a mitochondria-targeted, NIR-absorbing cryptocyanine probe (Mito-CCy) and evaluated its photophysical properties, photothermal conversion efficiency, biological compatibility, cytotoxicity, and mitochondrial localization in HeLa cells. Upon subjecting 0.5 mL of a PBS buffer solution (10 mM, pH 7...
June 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28643345/mitochondrial-dynamics-in-the-regulation-of-neurogenesis-from-development-to-the-adult-brain
#11
REVIEW
Mireille Khacho, Ruth S Slack
Mitochondria are classically known to be the cellular energy producers, but a renewed appreciation for these organelles has developed with the accumulating discoveries of additional functions. The importance of mitochondria within the brain has been long known, particularly given the high-energy demanding nature of neurons. The energy demands imposed by neurons require the well-orchestrated morphological adaptation and distribution of mitochondria. Recent studies now reveal the importance of mitochondrial dynamics not only in mature neurons but also during neural development, particularly during the process of neurogenesis and neural stem cell fate decisions...
June 23, 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28642882/tumor-related-exosomes-contribute-to-tumor-promoting-microenvironment-an-immunological-perspective
#12
REVIEW
Wuzhen Chen, Jingxin Jiang, Wenjie Xia, Jian Huang
Exosomes are a kind of cell-released membrane-form structures which contain proteins, lipids, and nucleic acids. These vesicular organelles play a key role in intercellular communication. Numerous experiments demonstrated that tumor-related exosomes (TEXs) can induce immune surveillance in the microenvironment in vivo and in vitro. They can interfere with the maturation of DC cells, impair NK cell activation, induce myeloid-derived suppressor cells, and educate macrophages into protumor phenotype. They can also selectively induce effector T cell apoptosis via Fas/FasL interaction and enhance regulatory T cell proliferation and function by releasing TGF-β...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28642840/cytolethal-distending-toxin-enhances-radiosensitivity-in-prostate-cancer-cells-by-regulating-autophagy
#13
Hwai-Jeng Lin, Hsin-Ho Liu, Chia-Der Lin, Min-Chuan Kao, Yu-An Chen, Chuan Chiang-Ni, Zhi-Pei Jiang, Mei-Zi Huang, Chun-Jung Lin, U-Ging Lo, Li-Chiung Lin, Cheng-Kuo Lai, Ho Lin, Jer-Tsong Hsieh, Cheng-Hsun Chiu, Chih-Ho Lai
Cytolethal distending toxin (CDT) produced by Campylobacter jejuni contains three subunits: CdtA, CdtB, and CdtC. Among these three toxin subunits, CdtB is the toxic moiety of CDT with DNase I activity, resulting in DNA double-strand breaks (DSB) and, consequently, cell cycle arrest at the G2/M stage and apoptosis. Radiation therapy is an effective modality for the treatment of localized prostate cancer (PCa). However, patients often develop radioresistance. Owing to its particular biochemical properties, we previously employed CdtB as a therapeutic agent for sensitizing radioresistant PCa cells to ionizing radiation (IR)...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28642580/a-snake-venom-group-iia-pla2-with-immunomodulatory-activity-induces-formation-of-lipid-droplets-containing-15-d-pgj2-in-macrophages
#14
Karina Cristina Giannotti, Elbio Leiguez, Ana Eduarda Zulim de Carvalho, Neide Galvão Nascimento, Márcio Hideki Matsubara, Consuelo Latorre Fortes-Dias, Vanessa Moreira, Catarina Teixeira
Crotoxin B (CB) is a catalytically active group IIA sPLA2 from Crotalus durissus terrificus snake venom. In contrast to most GIIA sPLA2s, CB exhibits anti-inflammatory effects, including the ability to inhibit leukocyte functions. Lipid droplets (LDs) are lipid-rich organelles associated with inflammation and recognized as a site for the synthesis of inflammatory lipid mediators. Here, the ability of CB to induce formation of LDs and the mechanisms involved in this effect were investigated in isolated macrophages...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642439/assembly-principles-and-structure-of-a-6-5-mda-bacterial-microcompartment-shell
#15
Markus Sutter, Basil Greber, Clement Aussignargues, Cheryl A Kerfeld
Many bacteria contain primitive organelles composed entirely of protein. These bacterial microcompartments share a common architecture of an enzymatic core encapsulated in a selectively permeable protein shell; prominent examples include the carboxysome for CO2 fixation and catabolic microcompartments found in many pathogenic microbes. The shell sequesters enzymatic reactions from the cytosol, analogous to the lipid-based membrane of eukaryotic organelles. Despite available structural information for single building blocks, the principles of shell assembly have remained elusive...
June 23, 2017: Science
https://www.readbyqxmd.com/read/28642299/dysfunctional-neutrophil-effector-organelle-mobilisation-and-microbicidal-protein-release-in-alcohol-related-cirrhosis
#16
Thomas Henry Tranah, Godhev K Manakkat Vijay, Jennifer M Ryan, Robin Daniel Abeles, Paul Kevin Middleton, Debbie Lindsay Shawcross
BACKGROUND AND AIMS: Patients with alcohol-related cirrhosis (ALD) are prone to infection. Circulating neutrophils in ALD are dysfunctional and predict development of sepsis, organ dysfunction and survival. Neutrophil granules are important effector organelles containing a toxic array of microbicidal proteins, whose controlled release is required to kill micro-organisms whilst minimising inflammation and damage to host tissue. We investigated the role of these granular responses in contributing to immune disarray in ALD...
June 22, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28642246/modulation-of-endoplasmic-reticulum-stress-controls-cd4-t-cell-activation-and-anti-tumor-function
#17
Jessica E Thaxton, Caroline Wallace, Brian Riesenberg, Yongliang Zhang, Chrystal Paulos, Craig Beeson, Bei Liu, Zihai Li
The endoplasmic reticulum (ER) is an energy-sensing organelle with intimate ties to programming cell activation and metabolic fate. T-cell receptor (TCR) activation represents a form of acute cell stress and induces mobilization of ER Ca(2+) stores. The role of the ER in programming T-cell activation and metabolic fate remains largely undefined. Gp96 is an ER protein with functions as a molecular chaperone and Ca(2+) buffering protein. We hypothesized that the ER stress response may be important for CD4(+) T-cell activation and that gp96 may be integral to this process...
June 22, 2017: Cancer Immunology Research
https://www.readbyqxmd.com/read/28642134/mitochondrial-potassium-channels-in-cell-death
#18
Vanessa Checchetto, Michele Azzolini, Roberta Peruzzo, Paola Capitanio, Luigi Leanza
Mitochondria are intracellular organelles involved in several processes from bioenergetics to cell death. In the latest years, ion channels are arising as new possible targets in controlling several cellular functions. The discovery that several plasma membrane located ion channels have intracellular counterparts, has now implemented this consideration and the number of studies enforcing the understanding of their role in different metabolic pathways. In this review, we will discuss the recent updates in the field, focusing our attention on the involvement of potassium channels during mitochondrial mediated apoptotic cell death...
June 19, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28641621/-effect-of-down-regulatory-nucleostemin-expression-on-autophagy-activities-in-p53-null-hl-60-leukemia-cells
#19
Yuan-Yu Wei, Zhao-Bo Li, Fan Zhang, Ning-Ning Wang, Shuai Liu, Bao-Hong Yue
OBJECTIVE: Based on previous microarry and bioinformatic analysis results, to investigate the effect of nucleostemin(NS) expression down-regulation on autophagy activity in p53 null HL-60 leukemia cells, so as to provide evidence for studying mechanisms of p53-independent signal pathway of NS in details. METHODS: The autophagy activity of HL-60 cells after down-regulation of NS expression was detected with acidine orange staining, Western blot and transmission electron mcrioscope technique...
June 2017: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28641181/the-caveolae-dress-code-structure-and-signaling
#20
REVIEW
Christophe Lamaze, Nicolas Tardif, Melissa Dewulf, Stéphane Vassilopoulos, Cédric M Blouin
Over the past decade, interest in caveolae biology has peaked. These small bulb-shaped plasma membrane invaginations of 50-80nm diameter present in most cell types have been upgraded from simple membrane structures to a more complex bona fide organelle. However, although caveolae are involved in several essential cellular functions and pathologies, the underlying molecular mechanisms remain poorly defined. Following the identification of caveolins and cavins as the main caveolae constituents, recent studies have brought new insight into their structural organization as a coat...
June 19, 2017: Current Opinion in Cell Biology
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