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Morgan G Stykel, Kayla Humphries, Mathew P Kirby, Chris Czaniecki, Tinya Wang, Tammy Ryan, Vladimir Bamm, Scott D Ryan
Neuronal loss in Parkinson's disease (PD) is associated with aberrant mitochondrial function in dopaminergic (DA) neurons of the substantia nigra pars compacta. An association has been reported between PD onset and exposure to mitochondrial toxins, including the agrochemicals paraquat (PQ), maneb (MB), and rotenone (Rot). Here, with the use of a patient-derived stem cell model of PD, allowing comparison of DA neurons harboring a mutation in the α-synuclein (α-syn) gene ( SNCA-A53T) against isogenic, mutation-corrected controls, we describe a novel mechanism whereby NO, generated from SNCA-A53T mutant neurons exposed to Rot or PQ/MB, inhibits anterograde mitochondrial transport through nitration of α-tubulin (α-Tub)...
April 24, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Masashi Yukawa, Tomoaki Yamauchi, Naoaki Kurisawa, Shakil Ahmed, Ken-Ichi Kimura, Takashi Toda
Many human cancer cells contain more than two centrosomes, yet these cancer cells can form pseudo-bipolar spindles through the mechanism, called centrosome clustering, and survive, instead of committing lethal multipolar mitoses. Kinesin-14/HSET, a minus end-directed motor, plays a crucial role in centrosome clustering. Accordingly, HSET is deemed to be a promising chemotherapeutic target to selectively kill cancer cells. Recently, three HSET inhibitors (AZ82, CW069 and SR31527) have been reported, but their specificity and efficacy have not been evaluated rigorously...
April 20, 2018: Fungal Genetics and Biology: FG & B
Kyongwan Kim, Natsuhiko Yoshinaga, Sanjib Bhattacharyya, Hikaru Nakazawa, Mitsuo Umetsu, Winfried Teizer
During the early developmental process of organisms, the formation of left-right laterality requires a subtle mechanism, as it is associated with other principal body axes. Any inherent chiral feature in an egg cell can in principal trigger this spontaneous breaking of chiral symmetry. Individual microtubules, major cytoskeletal filaments, are known as chiral objects. However, to date there lacks convincing evidence of a hierarchical connection of the molecular nature of microtubules to large-scale chirality, particularly at the length scale of an entire cell...
April 19, 2018: Soft Matter
Brigette Y Monroy, Danielle L Sawyer, Bryce E Ackermann, Melissa M Borden, Tracy C Tan, Kassandra M Ori-McKenney
Within cells, motor and non-motor microtubule-associated proteins (MAPs) simultaneously converge on the microtubule. How the binding activities of non-motor MAPs are coordinated and how they contribute to the balance and distribution of motor transport is unknown. Here, we examine the relationship between MAP7 and tau owing to their antagonistic roles in vivo. We find that MAP7 and tau compete for binding to microtubules, and determine a mechanism by which MAP7 displaces tau from the lattice. MAP7 promotes kinesin-based transport in vivo and strongly recruits kinesin-1 to the microtubule in vitro, providing evidence for direct enhancement of motor motility by a MAP...
April 16, 2018: Nature Communications
Toni McHugh, Agata A Gluszek, Julie P I Welburn
Mitotic spindle positioning specifies the plane of cell division during anaphase. Spindle orientation and positioning are therefore critical to ensure symmetric division in mitosis and asymmetric division during development. The control of astral microtubule length plays an essential role in positioning the spindle. In this study, using gene knockout, we show that the kinesin-8 Kif18b controls microtubule length to center the mitotic spindle at metaphase. Using in vitro reconstitution, we reveal that Kif18b is a highly processive plus end-directed motor that uses a C-terminal nonmotor microtubule-binding region to accumulate at growing microtubule plus ends...
April 16, 2018: Journal of Cell Biology
Arkadi Manukyan, Lilit Sargsyan, Sarah J Parsons, P Todd Stukenberg
Assembly of the mitotic spindle is essential for proper chromosome segregation during mitosis. Maintenance of spindle poles requires precise regulation of kinesin- and dynein-generated forces, and improper regulation of these forces disrupts pole integrity leading to pole fragmentation. The formation and function of the mitotic spindle are regulated by many proteins, including Aurora A kinase and the motor proteins Kif2a and Eg5. Here, we characterize a surprising role for the RhoA GTPase-activating protein, p190RhoGAP, in regulating the mitotic spindle...
April 14, 2018: Chromosoma
R Kelly Dawe, Elizabeth G Lowry, Jonathan I Gent, Michelle C Stitzer, Kyle W Swentowsky, David M Higgins, Jeffrey Ross-Ibarra, Jason G Wallace, Lisa B Kanizay, Magdy Alabady, Weihong Qiu, Kuo-Fu Tseng, Na Wang, Zhi Gao, James A Birchler, Alex E Harkess, Amy L Hodges, Evelyn N Hiatt
Maize abnormal chromosome 10 (Ab10) encodes a classic example of true meiotic drive that converts heterochromatic regions called knobs into motile neocentromeres that are preferentially transmitted to egg cells. Here, we identify a cluster of eight genes on Ab10, called the Kinesin driver (Kindr) complex, that are required for both neocentromere motility and preferential transmission. Two meiotic drive mutants that lack neocentromere activity proved to be kindr epimutants with increased DNA methylation across the entire gene cluster...
April 2, 2018: Cell
Edith P Karuna, Shannon S Choi, Michael K Scales, Jennie Hum, Michael Cohen, Fernando A Fierro, Hsin-Yi Henry Ho
Noncanonical WNT pathways function independently of the β-catenin transcriptional co-activator to regulate diverse morphogenetic and pathogenic processes. Recent studies showed that noncanonical WNTs, such as WNT5A, can signal the degradation of several downstream effectors, thereby modulating these effectors' cellular activities. The protein domain(s) that mediates the WNT5A-dependent degradation response, however, has not been identified. By coupling protein mutagenesis experiments with a flow cytometry-based degradation reporter assay, we have defined a protein domain in the kinesin superfamily protein KIF26B that is essential for WNT5A-dependent degradation...
April 5, 2018: Genes
Xiaowei Fu, Yaqiong Zhu, Bingbing Zheng, Yeqing Zou, Chao Wang, Peng Wu, Jun Wang, Haimin Chen, Pengcheng Du, Bo Liang, Lu Fang
Kinesin family member C1 (KIFC1, also known as HSET) is a minus end-directed motor protein, which is critical in centrosome clustering. The present study investigated the expression of KIFC1 in paired hepatocellular carcinoma (HCC) tissues and adjacent non-cancerous tissues from 91 patients by immunohistochemical analysis; clinical data were concomitantly collected. KIFC1 was expressed at high levels in HCC tissues, compared with that in peritumoral tissues (54.9 vs. 14.3%; P<0.01), and its expression correlated with tumor emboli, metastasis, recurrence and time of recurrence...
March 29, 2018: International Journal of Oncology
A M P B Seneviratne, Geri Kreitzer
No abstract text is available yet for this article.
March 30, 2018: Aging
Alessio Vagnoni, Simon L Bullock
Mitochondria play fundamental roles within cells, including energy provision, calcium homeostasis, and the regulation of apoptosis. The transport of mitochondria by microtubule-based motors is critical for neuronal structure and function. This process allows local requirements for mitochondrial functions to be met and also facilitates recycling of these organelles [1, 2]. An age-related reduction in mitochondrial transport has been observed in neurons of mammalian and non-mammalian organisms [3-6], and has been proposed to contribute to the broader decline in neuronal function that occurs during aging [3, 5-7]...
March 20, 2018: Current Biology: CB
Qiaochu Li, Kuo-Fu Tseng, Stephen J King, Weihong Qiu, Jing Xu
Kinesin-1 (hereafter referred to as kinesin) is a major microtubule-based motor protein for plus-end-directed intracellular transport in live cells. While the single-molecule functions of kinesin are well characterized, the physiologically relevant transport of membranous cargos by small teams of kinesins remains poorly understood. A key experimental challenge remains in the quantitative control of the number of motors driving transport. Here we utilized "motile fraction" to overcome this challenge and experimentally accessed transport by a single kinesin through the physiologically relevant transport by a small team of kinesins...
March 28, 2018: Journal of Chemical Physics
Alexis T Weiner, Dylan Y Seebold, Nick L Michael, Michelle Guignet, Chengye Feng, Brandon Follick, Brandon A Yusko, Nathan P Wasilko, Pedro Torres-Gutierrez, Melissa M Rolls
In Drosophila neurons, uniform minus-end-out polarity in dendrites is maintained in part by kinesin-2-mediated steering of growing microtubules at branch points. Apc links the kinesin motor to growing microtubule plus ends and Apc2 recruits Apc to branch points where it functions. Because Apc2 acts to concentrate other steering proteins to branch points, we wished to understand how Apc2 is targeted. From an initial broad candidate RNAi screen, we found Miro (a mitochondrial transport protein), Ank2, Axin, spastin and Rac1 were required to position Apc2-GFP at dendrite branch points...
March 30, 2018: G3: Genes—Genomes—Genetics
Marcelo Perez-Pepe, Ana J Fernández-Alvarez, Graciela Lidia Boccaccio
The dynamic formation of stress granules (SGs), processing bodies (PBs), and related RNA organelles regulates diverse cellular processes, including the coordination of functionally connected messengers, the translational regulation at the synapse, and the control of viruses and retrotransposons. Recent studies have shown that pyruvate kinase and other enzymes localize in SGs and PBs, where they become protected from stress insults. These observations may have implications on enzyme regulation and metabolic control exerted by RNA-based organelles...
March 29, 2018: Biochemistry
Xiao-Long Zhang, Huan-Huan Ding, Ting Xu, Meng Liu, Chao Ma, Shao-Ling Wu, Jia-You Wei, Cui-Cui Liu, Su-Bo Zhang, Wen-Jun Xin
Palmitoylation of δ-catenin is critical to synapse plasticity and memory formation. We found that δ-catenin palmitoylation is also instrumental in the development of neuropathic pain. The abundances of palmitoylated δ-catenin and the palmitoyl acyltransferase DHHC3 were increased in dorsal root ganglion (DRG) sensory neurons in rat models of neuropathic pain. Inhibiting palmitoyl acyltransferases or decreasing δ-catenin abundance in the DRG by intrathecal injection of 2-bromopalmitate or shRNA, respectively, alleviated oxaliplatin or nerve injury-induced neuropathic pain in the rats...
March 27, 2018: Science Signaling
Philipp Michael Klein, Sarah Kern, Dian-Jang Lee, Johannes Schmaus, Miriam Höhn, Jan Gorges, Uli Kazmaier, Ernst Wagner
The delivery of small interfering RNA (siRNA) and its therapeutic usage as an anti-cancer agent requires a carrier system for selective internalization into the cytosol of tumor cells. We prepared folate-bearing formulations by first complexing siRNA with the novel azido-functionalized sequence-defined cationizable lipo-oligomer 1106 (containing two cholanic acids attached to an oligoaminoamide backbone in T-shape configuration) into spherical, ∼100-200 nm sized lipopolyplexes, followed by surface-functionalization with various folate-conjugated DBCO-PEG agents...
March 19, 2018: Biomaterials
Wen-Feng Lin, Xiao-Lu Lin, Seng-Wang Fu, Li Yang, Chao-Tao Tang, Yun-Jie Gao, Hao-Yan Chen, Zhi-Zheng Ge
Kinesin family member 20B (KIF20B) has been reported to have an oncogenic role in bladder and hepatocellular cancer cells, but its role in colorectal cancer (CRC) progression remains unclear. In this study, we assessed the mRNA and protein levels of KIF20B in CRC tissues using qRT-PCR and immunohistochemistry, respectively. KIF20B was overexpressed in CRC tissues and was associated with cancer invasion and metastasis. Mechanistically, KIF20B overexpression promoted the epithelial-mesenchymal transition (EMT) process mediated by glioma-associated oncogene 1 (Gli1) as well as CRC cell migration and invasion...
March 24, 2018: Molecular Carcinogenesis
Michał Szkop, Beata Kliszcz, Andrzej A Kasprzak
We describe a simple and reproducible protocol for the preparation of microscope glass slides for in vitro motility assays that use total internal reflection fluorescence microscopy. The developed method utilizes trimethylchlorosilane (TMCS) as a silanizing reagent, which in the presence of imidazole as a catalyst and under optimized conditions enables reproducible preparation of high-quality hydrophobic glass surfaces. This method presents a simplification and improvement in reproducibility over the commonly applied protocol utilizing dichlorodimethylsilane (DDS) as a silanizing agent...
March 20, 2018: Analytical Biochemistry
Aude Nicolas, Kevin P Kenna, Alan E Renton, Nicola Ticozzi, Faraz Faghri, Ruth Chia, Janice A Dominov, Brendan J Kenna, Mike A Nalls, Pamela Keagle, Alberto M Rivera, Wouter van Rheenen, Natalie A Murphy, Joke J F A van Vugt, Joshua T Geiger, Rick A Van der Spek, Hannah A Pliner, Shankaracharya, Bradley N Smith, Giuseppe Marangi, Simon D Topp, Yevgeniya Abramzon, Athina Soragia Gkazi, John D Eicher, Aoife Kenna, Gabriele Mora, Andrea Calvo, Letizia Mazzini, Nilo Riva, Jessica Mandrioli, Claudia Caponnetto, Stefania Battistini, Paolo Volanti, Vincenzo La Bella, Francesca L Conforti, Giuseppe Borghero, Sonia Messina, Isabella L Simone, Francesca Trojsi, Fabrizio Salvi, Francesco O Logullo, Sandra D'Alfonso, Lucia Corrado, Margherita Capasso, Luigi Ferrucci, Cristiane de Araujo Martins Moreno, Sitharthan Kamalakaran, David B Goldstein, Aaron D Gitler, Tim Harris, Richard M Myers, Hemali Phatnani, Rajeeva Lochan Musunuri, Uday Shankar Evani, Avinash Abhyankar, Michael C Zody, Julia Kaye, Steven Finkbeiner, Stacia K Wyman, Alex LeNail, Leandro Lima, Ernest Fraenkel, Clive N Svendsen, Leslie M Thompson, Jennifer E Van Eyk, James D Berry, Timothy M Miller, Stephen J Kolb, Merit Cudkowicz, Emily Baxi, Michael Benatar, J Paul Taylor, Evadnie Rampersaud, Gang Wu, Joanne Wuu, Giuseppe Lauria, Federico Verde, Isabella Fogh, Cinzia Tiloca, Giacomo P Comi, Gianni Sorarù, Cristina Cereda, Philippe Corcia, Hannu Laaksovirta, Liisa Myllykangas, Lilja Jansson, Miko Valori, John Ealing, Hisham Hamdalla, Sara Rollinson, Stuart Pickering-Brown, Richard W Orrell, Katie C Sidle, Andrea Malaspina, John Hardy, Andrew B Singleton, Janel O Johnson, Sampath Arepalli, Peter C Sapp, Diane McKenna-Yasek, Meraida Polak, Seneshaw Asress, Safa Al-Sarraj, Andrew King, Claire Troakes, Caroline Vance, Jacqueline de Belleroche, Frank Baas, Anneloor L M A Ten Asbroek, José Luis Muñoz-Blanco, Dena G Hernandez, Jinhui Ding, J Raphael Gibbs, Sonja W Scholz, Mary Kay Floeter, Roy H Campbell, Francesco Landi, Robert Bowser, Stefan M Pulst, John M Ravits, Daniel J L MacGowan, Janine Kirby, Erik P Pioro, Roger Pamphlett, James Broach, Glenn Gerhard, Travis L Dunckley, Christopher B Brady, Neil W Kowall, Juan C Troncoso, Isabelle Le Ber, Kevin Mouzat, Serge Lumbroso, Terry D Heiman-Patterson, Freya Kamel, Ludo Van Den Bosch, Robert H Baloh, Tim M Strom, Thomas Meitinger, Aleksey Shatunov, Kristel R Van Eijk, Mamede de Carvalho, Maarten Kooyman, Bas Middelkoop, Matthieu Moisse, Russell L McLaughlin, Michael A Van Es, Markus Weber, Kevin B Boylan, Marka Van Blitterswijk, Rosa Rademakers, Karen E Morrison, A Nazli Basak, Jesús S Mora, Vivian E Drory, Pamela J Shaw, Martin R Turner, Kevin Talbot, Orla Hardiman, Kelly L Williams, Jennifer A Fifita, Garth A Nicholson, Ian P Blair, Guy A Rouleau, Jesús Esteban-Pérez, Alberto García-Redondo, Ammar Al-Chalabi, Ekaterina Rogaeva, Lorne Zinman, Lyle W Ostrow, Nicholas J Maragakis, Jeffrey D Rothstein, Zachary Simmons, Johnathan Cooper-Knock, Alexis Brice, Stephen A Goutman, Eva L Feldman, Summer B Gibson, Franco Taroni, Antonia Ratti, Cinzia Gellera, Philip Van Damme, Wim Robberecht, Pietro Fratta, Mario Sabatelli, Christian Lunetta, Albert C Ludolph, Peter M Andersen, Jochen H Weishaupt, William Camu, John Q Trojanowski, Vivianna M Van Deerlin, Robert H Brown, Leonard H van den Berg, Jan H Veldink, Matthew B Harms, Jonathan D Glass, David J Stone, Pentti Tienari, Vincenzo Silani, Adriano Chiò, Christopher E Shaw, Bryan J Traynor, John E Landers
To identify novel genes associated with ALS, we undertook two lines of investigation. We carried out a genome-wide association study comparing 20,806 ALS cases and 59,804 controls. Independently, we performed a rare variant burden analysis comparing 1,138 index familial ALS cases and 19,494 controls. Through both approaches, we identified kinesin family member 5A (KIF5A) as a novel gene associated with ALS. Interestingly, mutations predominantly in the N-terminal motor domain of KIF5A are causative for two neurodegenerative diseases: hereditary spastic paraplegia (SPG10) and Charcot-Marie-Tooth type 2 (CMT2)...
March 21, 2018: Neuron
Itziar Ibarlucea-Benitez, Luke S Ferro, David G Drubin, Georjana Barnes
Mitotic spindle disassembly after chromosome separation is as important as spindle assembly, yet the molecular mechanisms for spindle disassembly are unclear. In this study, we investigated how the chromosomal passenger complex (CPC), which contains the Aurora B kinase Ipl1, swiftly concentrates at the spindle midzone in late anaphase, and we researched the role of this dramatic relocalization during spindle disassembly. We showed that the kinesins Kip1 and Kip3 are essential for CPC relocalization. In cells lacking Kip1 and Kip3, spindle disassembly is severely delayed until after contraction of the cytokinetic ring...
March 21, 2018: Journal of Cell Biology
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