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Mitochondrial fission

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https://www.readbyqxmd.com/read/29466320/dynamin-related-protein-1-at-the-crossroads-of-cancer
#1
REVIEW
Ana Rita Lima, Liliana Santos, Marcelo Correia, Paula Soares, Manuel Sobrinho-Simões, Miguel Melo, Valdemar Máximo
Mitochondrial dynamics are known to have an important role in so-called age-related diseases, including cancer. Mitochondria is an organelle involved in many key cellular functions and responds to physiologic or stress stimuli by adapting its structure and function. Perhaps the most important structural changes involve mitochondrial dynamics (fission and fusion), which occur in normal cells as well as in cells under dysregulation, such as cancer cells. Dynamin-related protein 1 (DRP1), a member of the dynamin family of guanosine triphosphatases (GTPases), is the key component of mitochondrial fission machinery...
February 21, 2018: Genes
https://www.readbyqxmd.com/read/29464885/effect-of-roux-en-y-gastric-bypass-on-liver-mitochondrial-dynamics-in-a-rat-model-of-obesity
#2
Jessica Sacks, Anny Mulya, Ciaran E Fealy, Hazel Huang, John D Mosinski, Mangesh R Pagadala, Hideharu Shimizu, Esam Batayyah, Philip R Schauer, Stacy A Brethauer, John P Kirwan
Bariatric surgery provides significant and durable improvements in glycemic control and hepatic steatosis, but the underlying mechanisms that drive improvements in these metabolic parameters remain to be fully elucidated. Recently, alterations in mitochondrial morphology have shown a direct link to nutrient adaptations in obesity. Here, we evaluate the effects of Roux-en-Y gastric bypass (RYGB) surgery on markers of liver mitochondrial dynamics in a diet-induced obesity Sprague-Dawley (SD) rat model. Livers were harvested from adult male SD rats 90-days after either Sham or RYGB surgery and continuous high-fat feeding...
February 2018: Physiological Reports
https://www.readbyqxmd.com/read/29464060/drp1-fis1-interaction-mediates-mitochondrial-dysfunction-bioenergetic-failure-and-cognitive-decline-in-alzheimer-s-disease
#3
Amit U Joshi, Nay L Saw, Mehrdad Shamloo, Daria Mochly-Rosen
Mitochondrial dynamics, involving a balance between fusion and fission, regulates mitochondrial quality and number. Increasing evidence suggests that dysfunctional mitochondria play a role in Alzheimer's disease (AD). We observed that Drp1 interaction with one of the adaptors, Fis1, is significantly increased in Aβ-treated neurons and AD patient-derived fibroblasts. P110, a seven-amino acid peptide, which specifically inhibits Drp1/Fis1 interaction without affecting the interaction of Drp1 with its other adaptors, attenuated Aβ42 -induced mitochondrial recruitment of Drp1 and prevented mitochondrial structural and functional dysfunction in cultured neurons, in cells expressing mutant amyloid precursor protein (KM670/671NL), and in five different AD patient-derived fibroblasts...
January 19, 2018: Oncotarget
https://www.readbyqxmd.com/read/29463879/redox-control-of-vascular-smooth-muscle-cell-function-and-plasticity
#4
REVIEW
Brittany G Durgin, Adam C Straub
Vascular smooth muscle cells (SMC) play a major role in vascular diseases, such as atherosclerosis and hypertension. It has long been established in vitro that contractile SMC can phenotypically switch to function as proliferative and/or migratory cells in response to stimulation by oxidative stress, growth factors, and inflammatory cytokines. Reactive oxygen species (ROS) are oxidative stressors implicated in driving vascular diseases, shifting cell bioenergetics, and increasing SMC proliferation, migration, and apoptosis...
February 20, 2018: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/29463805/ceramide-induced-bok-promotes-mitochondrial-fission-in-preeclampsia
#5
Jonathan Ausman, Joelcio Abbade, Leonardo Ermini, Abby Farrell, Andrea Tagliaferro, Martin Post, Isabella Caniggia
Mitochondria are in a constant balance of fusing and dividing in response to cellular cues. Fusion creates healthy mitochondria, whereas fission results in removal of non-functional organelles. Changes in mitochondrial dynamics typify several human diseases. However, the contribution of mitochondrial dynamics to preeclampsia, a hypertensive disorder of pregnancy characterized by placental cell autophagy and death, remains unknown. Herein, we show that the mitochondrial dynamic balance in preeclamptic placentae is tilted toward fission (increased DRP1 expression/activation and decreased OPA1 expression)...
February 20, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29462856/morphological-pathways-of-mitochondrial-division
#6
REVIEW
Bernard Tandler, Charles L Hoppel, Jason A Mears
Mitochondrial fission is essential for distributing cellular energy throughout cells and for isolating damaged regions of the organelle that are targeted for degradation. Excessive fission is associated with the progression of cell death as well. Therefore, this multistep process is tightly regulated and several physiologic cues directly impact mitochondrial division. The double membrane structure of mitochondria complicates this process, and protein factors that drive membrane scission need to coordinate the separation of both the outer and inner mitochondrial membranes...
February 15, 2018: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29459714/the-mycotoxin-phomoxanthone-a-disturbs-the-form-and-function-of-the-inner-mitochondrial-membrane
#7
Philip Böhler, Fabian Stuhldreier, Ruchika Anand, Arun Kumar Kondadi, David Schlütermann, Niklas Berleth, Jana Deitersen, Nora Wallot-Hieke, Wenxian Wu, Marian Frank, Hendrik Niemann, Elisabeth Wesbuer, Andreas Barbian, Tomas Luyten, Jan B Parys, Stefanie Weidtkamp-Peters, Andrea Borchardt, Andreas S Reichert, Aida Peña-Blanco, Ana J García-Sáez, Samuel Itskanov, Alexander M van der Bliek, Peter Proksch, Sebastian Wesselborg, Björn Stork
Mitochondria are cellular organelles with crucial functions in the generation and distribution of ATP, the buffering of cytosolic Ca2+ and the initiation of apoptosis. Compounds that interfere with these functions are termed mitochondrial toxins, many of which are derived from microbes, such as antimycin A, oligomycin A, and ionomycin. Here, we identify the mycotoxin phomoxanthone A (PXA), derived from the endophytic fungus Phomopsis longicolla, as a mitochondrial toxin. We show that PXA elicits a strong release of Ca2+ from the mitochondria but not from the ER...
February 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29459657/very-long-and-long-chain-3-hydroxy-acyl-coa-dehydrogenase-deficiency-correlates-with-deregulation-of-the-mitochondrial-fusion-fission-machinery
#8
Judith Hagenbuchner, Sabine Scholl-Buergi, Daniela Karall, Michael J Ausserlechner
Children diagnosed with Long-Chain-3-Hydroxy-Acyl-CoA-Dehydrogenase-Deficiency (LCHADD) or Very-Long-Chain-3-Hydroxy-Acyl-CoA-Dehydrogenase-Deficiency (VLCADD) frequently present with hypertrophic cardiomyopathy or muscle weakness which is caused by the accumulation of fatty acid metabolites due to inactivating mutations in the mitochondrial trifunctional protein. By analyzing mitochondrial morphology we uncovered that mutations within the HADHA or the ACADVL gene not only affect fatty acid oxidation, but also cause significant changes in the DNM1L/MFN2 ratio leading to the significant accumulation of truncated and punctate mitochondria in contrast to network-like mitochondrial morphology in controls...
February 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29458562/the-fission-yeast-schizosaccharomyces-pombe-mtf2-is-required-for-mitochondrial-cox1-gene-expression
#9
Jinyu Liu, Yan Li, Jie Chen, Yirong Wang, Mengting Zou, Ruyue Su, Ying Huang
Mitochondrial gene expression is essential for adenosine triphosphate synthesis via oxidative phosphorylation, which is the universal energy currency of cells. Here, we report the identification and characterization of a homologue of Saccharomyces cerevisiae Mtf2 (also called Nam1) in Schizosaccharomyces pombe. The Δmtf2 mutant with the intron-containing mitochondrial DNA (mtDNA) exhibited impaired growth on a rich medium containing the non-fermentable carbon source glycerol, suggesting that mtf2 is involved in mitochondrial function...
January 12, 2018: Microbiology
https://www.readbyqxmd.com/read/29451211/electroacupuncture-preconditioning-protects-against-focal-cerebral-ischemia-reperfusion-injury-via-suppression-of-dynamin-related-protein-1
#10
Gao-Feng Zhang, Pei Yang, Zeng Yin, Huai-Long Chen, Fu-Guo Ma, Bin Wang, Li-Xin Sun, Yan-Lin Bi, Fei Shi, Ming-Shan Wang
Electroacupuncture preconditioning at acupoint Baihui (GV20) can reduce focal cerebral ischemia/reperfusion injury. However, the precise protective mechanism remains unknown. Mitochondrial fission mediated by dynamin-related protein 1 (Drp1) can trigger neuronal apoptosis following cerebral ischemia/reperfusion injury. Herein, we examined the hypothesis that electroacupuncture pretreatment can regulate Drp1, and thus inhibit mitochondrial fission to provide cerebral protection. Rat models of focal cerebral ischemia/reperfusion injury were established by middle cerebral artery occlusion at 24 hours after 5 consecutive days of preconditioning with electroacupuncture at GV20 (depth 2 mm, intensity 1 mA, frequency 2/15 Hz, for 30 minutes, once a day)...
January 2018: Neural Regeneration Research
https://www.readbyqxmd.com/read/29448246/effect-of-mst1-on-endometriosis-apoptosis-and-migration-role-of-drp1-related-mitochondrial-fission-and-parkin-required-mitophagy
#11
Qingdong Zhao, Mingxia Ye, Wen Yang, Min Wang, Mingxia Li, Chenglei Gu, Luyang Zhao, Zhe Zhang, Weidong Han, Wensheng Fan, Yuanguang Meng
BACKGROUND/AIMS: Mitochondrial homeostasis is implicated in the development and progression of endometriosis through poorly defined mechanisms. Mst1 is the major growth suppressor related to cancer migration, apoptosis and proliferation. However, whether Mst1 is involved in endometriosis apoptosis and migration via regulating the mitochondrial function remains to be elucidated. METHODS: Expression of Mst1 in endometriosis was examined via western blots. Cellular apoptosis was detected via MTT and TUNEL assay...
February 9, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29445117/transitional-correlation-between-inner-membrane-potential-and-atp-levels-of-neuronal-mitochondria
#12
R Suzuki, K Hotta, K Oka
The importance of highly active mitochondria and their contribution to neuronal function has been of recent interest. In most cases, however, mitochondrial activity is estimated using measurements of mitochondrial inner membrane potential (IMP mito ), and little is known about the dynamics of native mitochondrial ATP (ATP mito ). This study conducted simultaneous imaging of IMP mito and ATP mito in neurons to explore their behaviour and their correlation during physiological mitochondrial/neuronal activity...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29444369/rotaviral-non-structural-protein-4-triggers-dynamin-related-protein-1-dependent-mitochondrial-fragmentation-during-infection
#13
Arpita Mukherjee, Upayan Patra, Rahul Bhowmick, Mamta Chawla-Sarkar
Dynamic equilibrium between mitochondrial fission and mitochondrial fusion serves as an important quality control system within cells ensuring cellular vitality and homeostasis. Viruses often target mitochondrial dynamics as a part of their obligatory cellular reprogramming. The present study was undertaken to assess the status and regulation of mitochondrial dynamics during rotavirus (RV) infection. Distinct fragmentation of mitochondrial syncytia was observed during late hours of RV (SA11, Wa, A5-13) infection...
February 14, 2018: Cellular Microbiology
https://www.readbyqxmd.com/read/29441058/regulation-of-the-stress-activated-degradation-of-mitochondrial-respiratory-complexes-in-yeast
#14
Alba Timón-Gómez, David Sanfeliu-Redondo, Amparo Pascual-Ahuir, Markus Proft
Repair and removal of damaged mitochondria is a key process for eukaryotic cell homeostasis. Here we investigate in the yeast model how different protein complexes of the mitochondrial electron transport chain are subject to specific degradation upon high respiration load and organelle damage. We find that the turnover of subunits of the electron transport complex I equivalent and complex III is preferentially stimulated upon high respiration rates. Particular mitochondrial proteases, but not mitophagy, are involved in this activated degradation...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29438347/mitochondrial-dynamics-in-basal-and-stressful-conditions
#15
REVIEW
Naima Zemirli, Etienne Morel, Diana Molino
The historical role of mitochondria resides in converting the energy released during the oxidation of macromolecules (carbohydrates, lipids and proteins) into adenosine tri-phosphate, a major form of chemically stored energy which sustains cell growth and homeostasis. Beyond this role in bioenergetics regulation, mitochondria play a role in several other cellular processes including lipid metabolism, cellular calcium homeostasis, autophagy and immune responses. Furthermore, mitochondria are highly dynamic organelles: as all other cellular endomembranes, they are continuously moving along cytoskeleton, and, most importantly, they constantly interact one with each other by membrane tethering, fusion and fission...
February 13, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29432843/the-neuronal-protection-of-a-zinc-binding-protein-isolated-from-oyster
#16
Wei-Hsuan Hsu, Yu-Chun Lin, Bo-Rui Chen, She-Ching Wu, Bao-Hong Lee
Mitochondrial function is applied as oxidative stress and neuronal damage index. In this study, d-galactose was used to induce free radicals production and neuronal damage in HN-h cells, and the effect of novel 43 kDa protein isolated from oyster on anti-mitochondrial dysfunction and zinc-binding ability were evaluated. Crystal violet stain results indicated zinc-binding protein of oyster (ZPO) attenuated neuronal cell death induced by 100 mM of d-galactose on HN-h cells in a dose-dependent manner. ZPO alleviated mitochondrial inactivation, mitochondrial membrane potential decreasing, oxidative stress, and fusion/fission state in non-cytotoxic concentration of d-galactose (50 mM)-treated HN-h cells...
February 9, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29431643/epigenetic-dysregulation-of-the-drp1-binding-partners-mid49-and-mid51-increases-mitotic-mitochondrial-fission-and-promotes-pulmonary-arterial-hypertension-mechanistic-and-therapeutic-implications
#17
Kuang-Hueih Chen, Asish Dasgupta, Jianhui Lin, Francois Potus, Sebastien Bonnet, James Iremonger, Jennifer Fu, Jeffrey Mewburn, Danchen Wu, Kimberly Dunham-Snary, Anne L Theilmann, Zhi-Cheng Jing, Charles Hindmarch, Mark L Ormiston, Allan Lawrie, Stephen L Archer
Background -Mitotic fission is increased in pulmonary arterial hypertension (PAH), a hyperproliferative, apoptosis-resistant disease. The fission mediator, dynamin related protein 1 (Drp1) must complex with adaptor proteins to cause fission. Drp1-induced fission has been therapeutically targeted in experimental PAH. Here we examine the role of two recently discovered, poorly understood, Drp1 adapter proteins, mitochondrial dynamics protein of 49 and 51 kDa (MiD49 and MiD51) in normal vascular cells and explore their dysregulation in PAH...
February 5, 2018: Circulation
https://www.readbyqxmd.com/read/29425932/ablation-of-c-ebp-homologous-protein-attenuates-renal-fibrosis-after-ureteral-obstruction-by-reducing-autophagy-and-microtubule-disruption
#18
Mi Ra Noh, Chang-Hoon Woo, Mae-Ja Park, Jee In Kim, Kwon Moo Park
Fibrosis is an undesirable consequence of injury and a critical problem in many diseases. Recent studies have demonstrated an association of C/EBP homologous protein (CHOP) with fibrosis. We investigated the mechanism of CHOP in kidney fibrosis progression after unilateral ureteral obstruction (UUO) using Chop gene-deleted (Chop-/-) mice and their wild-type littermates (Chop+/+). UUO-induced kidney fibrosis was reduced in the Chop-/- than Chop+/+ mice. After UUO, CHOP expression was detected in the cytosol and nucleus of distal tubule cells and collecting duct cells of the kidney...
February 6, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29423030/targeting-dual-specificity-protein-kinase-ttk-attenuates-tumorigenesis-of-glioblastoma
#19
Jia Wang, Yuchen Xie, Xiaobin Bai, Ning Wang, Hai Yu, Zhong Deng, Minxue Lian, Shuo Yu, Hao Liu, Wanfu Xie, Maode Wang
Accumulating evidence has proved that glioma stem-like cells (GSCs) are responsible for tumorigenesis, treatment resistance, and subsequent tumor recurrence in glioblastoma (GBM). In this study, we identified dual specificity protein kinase TTK (TTK) as the most up-regulated and differentially expressed kinase encoding genes in GSCs. Functionally, TTK was essential for in vitro clonogenicity and in vivo tumor propagation in GSCs. Clinically, TTK expression was highly enriched in GBM, moreover, was inversely correlated with a poor prognosis in GBM patients...
January 9, 2018: Oncotarget
https://www.readbyqxmd.com/read/29419416/als-lymphoblastoid-cell-lines-as-a-considerable-model-to-understand-disease-mechanisms
#20
O Pansarasa, M Bordoni, L Dufruca, L Diamanti, D Sproviero, R Trotti, S Bernuzzi, S La Salvia, S Gagliardi, M Ceroni, C Cereda
New evidences switch the hypothesis of amyotrophic lateral sclerosis (ALS) from a "neurocentric" to a "multisystemic" or "non-neurocentric" point of view. From 2006, we focused on the study of non-neural cells, patients' peripheral blood mononuclear cells (PMBCs) and lymphoblastoid cell lines (LCLs). Here, we characterized LCLs of sporadic ALS and patients carrying SOD1, TARDBP and FUS mutations to identify ALS biologically relevant signature, and whether and how mutations differentially affect ALS-linked pathways...
January 29, 2018: Disease Models & Mechanisms
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