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He, Jiang

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He, Jiang

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2013 - 20206

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Author's Publications: search.filters.isAuthorOfPublication.ec685eb4-d7d0-4984-b4a5-28248752dcac

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Now showing 1 - 6 of 6
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    Developmental mechanism of the periodic membrane skeleton in axons
    (eLife Sciences Publications, Ltd, 2014) Zhong, Guisheng; He, Jiang; Zhou, Ruobo; Lorenzo, Damaris; Babcock, Hazen; Bennett, Vann; Zhuang, Xiaowei
    Actin, spectrin, and associated molecules form a periodic sub-membrane lattice structure in axons. How this membrane skeleton is developed and why it preferentially forms in axons are unknown. Here, we studied the developmental mechanism of this lattice structure. We found that this structure emerged early during axon development and propagated from proximal regions to distal ends of axons. Components of the axon initial segment were recruited to the lattice late during development. Formation of the lattice was regulated by the local concentration of βII spectrin, which is higher in axons than in dendrites. Increasing the dendritic concentration of βII spectrin by overexpression or by knocking out ankyrin B induced the formation of the periodic structure in dendrites, demonstrating that the spectrin concentration is a key determinant in the preferential development of this structure in axons and that ankyrin B is critical for the polarized distribution of βII spectrin in neurites. DOI: http://dx.doi.org/10.7554/eLife.04581.001
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    A PIK3C3–Ankyrin-B–Dynactin pathway promotes axonal growth and multiorganelle transport
    (The Rockefeller University Press, 2014) Lorenzo, Damaris Nadia; Badea, Alexandra; Davis, Jonathan; Hostettler, Janell; He, Jiang; Zhong, Guisheng; Zhuang, Xiaowei; Bennett, Vann
    Axon growth requires long-range transport of organelles, but how these cargoes recruit their motors and how their traffic is regulated are not fully resolved. In this paper, we identify a new pathway based on the class III PI3-kinase (PIK3C3), ankyrin-B (AnkB), and dynactin, which promotes fast axonal transport of synaptic vesicles, mitochondria, endosomes, and lysosomes. We show that dynactin associates with cargo through AnkB interactions with both the dynactin subunit p62 and phosphatidylinositol 3-phosphate (PtdIns(3)P) lipids generated by PIK3C3. AnkB knockout resulted in shortened axon tracts and marked reduction in membrane association of dynactin and dynein, whereas it did not affect the organization of spectrin–actin axonal rings imaged by 3D-STORM. Loss of AnkB or of its linkages to either p62 or PtdIns(3)P or loss of PIK3C3 all impaired organelle transport and particularly retrograde transport in hippocampal neurons. Our results establish new functional relationships between PIK3C3, dynactin, and AnkB that together promote axonal transport of organelles and are required for normal axon length.
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    Dual Function of CD81 in Influenza Virus Uncoating and Budding
    (Public Library of Science, 2013) He, Jiang; Sun, Eileen; Bujny, Miriam V.; Kim, Doory; Davidson, Michael W.; Zhuang, Xiaowei
    As an obligatory pathogen, influenza virus co-opts host cell machinery to harbor infection and to produce progeny viruses. In order to characterize the virus-host cell interactions, several genome-wide siRNA screens and proteomic analyses have been performed recently to identify host factors involved in influenza virus infection. CD81 has emerged as one of the top candidates in two siRNA screens and one proteomic study. The exact role played by CD81 in influenza infection, however, has not been elucidated thus far. In this work, we examined the effect of CD81 depletion on the major steps of the influenza infection. We found that CD81 primarily affected virus infection at two stages: viral uncoating during entry and virus budding. CD81 marked a specific endosomal population and about half of the fused influenza virus particles underwent fusion within the CD81-positive endosomes. Depletion of CD81 resulted in a substantial defect in viral fusion and infection. During virus assembly, CD81 was recruited to virus budding site on the plasma membrane, and in particular, to specific sub-viral locations. For spherical and slightly elongated influenza virus, CD81 was localized at both the growing tip and the budding neck of the progeny viruses. CD81 knockdown led to a budding defect and resulted in elongated budding virions with a higher propensity to remain attached to the plasma membrane. Progeny virus production was markedly reduced in CD81-knockdown cells even when the uncoating defect was compensated. In filamentous virus, CD81 was distributed at multiple sites along the viral filament. Taken together, these results demonstrate important roles of CD81 in both entry and budding stages of the influenza infection cycle.
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    Monovalent engagement of the BCR activates ovalbumin-specific transnuclear B cells
    (The Rockefeller University Press, 2014) Avalos, Ana M.; Bilate, Angelina M.; Witte, Martin D.; Tai, Albert K.; He, Jiang; Frushicheva, Maria P.; Thill, Peter D.; Meyer-Wentrup, Friederike; Theile, Christopher S.; Chakraborty, Arup K.; Zhuang, Xiaowei; Ploegh, Hidde L.
    Valency requirements for B cell activation upon antigen encounter are poorly understood. OB1 transnuclear B cells express an IgG1 B cell receptor (BCR) specific for ovalbumin (OVA), the epitope of which can be mimicked using short synthetic peptides to allow antigen-specific engagement of the BCR. By altering length and valency of epitope-bearing synthetic peptides, we examined the properties of ligands required for optimal OB1 B cell activation. Monovalent engagement of the BCR with an epitope-bearing 17-mer synthetic peptide readily activated OB1 B cells. Dimers of the minimal peptide epitope oriented in an N to N configuration were more stimulatory than their C to C counterparts. Although shorter length correlated with less activation, a monomeric 8-mer peptide epitope behaved as a weak agonist that blocked responses to cell-bound peptide antigen, a blockade which could not be reversed by CD40 ligation. The 8-mer not only delivered a suboptimal signal, which blocked subsequent responses to OVA, anti-IgG, and anti-kappa, but also competed for binding with OVA. Our results show that fine-tuning of BCR-ligand recognition can lead to B cell nonresponsiveness, activation, or inhibition.
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    Fluorescence Imaging of Virus-Host Cell Interaction and Super-Resolution Imaging of Neuronal Cytoskeleton
    (2015-11-10) He, Jiang; Sanes, Joshua; D'Souza, Victoria; Hacohen, Nir
    To study biological molecules, pathways and processes, fluorescence microscope has become an indispensable tool in modern biology. The major advantages of using fluorescence microscope include its ability to achieve molecule-specific visualization for targets of interest, and the compatibility of live cell imaging. With the advent of super-resolution imaging techniques, fluorescent microscope, for the first time, allows researchers to study biological processes on the nanometer scale. In this dissertation, I present the application of fluorescence imaging to characterize the role of host factors in influenza virus infection, and super-resolution imaging to study the developmental mechanism and prevalence of a periodic membrane skeleton in neurons. In Chapter 2 and 3, my colleagues and I studied the role of CD81 and COPI complex, two host factors identified in large-scale screens, for influenza infection. We found that CD81 regulates two distinct steps during influenza infection cycle: virus uncoating during entry and virus budding during egress. Depleting CD81 led to a significant defect in viral uncoating and viral gene replication during entry, while during virus egress, CD81 depletion resulted in virions that failed to detach from the plasma membrane and a marked decrease in progeny virus production. For COPI complexes, we found that COPI plays a direct role in viral membrane protein expression and assembly post-viral entry. In Chapter 4 and 5, we used super-resolution imaging to study the developmental mechanism and prevalence of a newly discovered periodic membrane skeleton in axons, formed by actin, spectrin and associated molecules. We found that the periodic membrane skeleton is highly prevalent in different neuronal types. It forms early during neuronal development, and originates from regions closer to the cell body and propagates toward the distal ends of axons. The lattice structure further matures by recruiting additional molecular components and appears to be highly stable once formed. The local concentration of βII spectrin is a key determinant for the formation of this periodic membrane skeleton. In addition, we identified ankyrin B as a critical molecular component for the polarized distribution of βII spectrin in neurites.
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    Inherited Causes of Clonal Haematopoiesis in 97,691 Whole Genomes
    (Springer Science and Business Media LLC, 2020-10-14) Bick, Alexander; Weinstock, Joshua S.; Nandakumar, Satish K.; Fulco, Charles P.; Bao, Erik; Zekavat, Seyedeh M.; Szeto, Mindy D.; Liao, Xiaotian; Leventhal, Matthew J.; Nasser, Joseph; Chang, Kyle; Laurie, Cecelia; Burugula, Bala Bharathi; Gibson, Christopher J.; Niroula, Abhishek; Lin, Amy; Taub, Margaret A.; Aguet, Francois; Ardlie, Kristin; Mitchell, Braxton D.; Barnes, Kathleen C.; Moscati, Arden; Fornage, Myriam; Redline, Susan; Psaty, Bruce M.; Silverman, Edwin; Weiss, Scott; Palmer, Nicholette D.; Vasan, Ramachandran S.; Burchard, Esteban G.; Kardia, Sharon L. R.; He, Jiang; Kaplan, Robert C.; Smith, Nicholas L.; Arnett, Donna K.; Schwartz, David A.; Correa, Adolfo; de Andrade, Mariza; Guo, Xiuqing; Konkle, Barbara A.; Custer, Brian; Peralta, Juan M.; Gui, Hongsheng; Meyers, Deborah A.; McGarvey, Stephen T.; Chen, Ida Yii-Der; Shoemaker, M. Benjamin; Peyser, Patricia A.; Broome, Jai G.; Gogarten, Stephanie M.; Wang, Fei Fei; Wong, Quenna; Montasser, May E.; Daya, Michelle; Kenny, Eimear E.; North, Kari E.; Launer, Lenore J.; Cade, Brian; Bis, Joshua C.; Cho, Michael; Lasky-Su, Jessica; Bowden, Donald W.; Cupples, L. Adrienne; Mak, Angel C. Y.; Becker, Lewis C.; Smith, Jennifer A.; Kelly, Tanika N.; Aslibekyan, Stella; Heckbert, Susan R.; Tiwari, Hemant K.; Yang, Ivana V.; Heit, John A.; Lubitz, Steven; Johnsen, Jill M.; Curran, Joanne E.; Wenzel, Sally E.; Weeks, Daniel E.; Rao, Dabeeru C.; Darbar, Dawood; Moon, Jee-Young; Tracy, Russell P.; Buth, Erin J.; Rafaels, Nicholas; Loos, Ruth J. F.; Durda, Peter; Liu, Yongmei; Hou, Lifang; Lee, Jiwon; Kachroo, Priyadarshini; Freedman, Barry I.; Levy, Daniel; Bielak, Lawrence F.; Hixson, James E.; Floyd, James S.; Whitsel, Eric A.; Ellinor, Patrick; Irvin, Marguerite R.; Fingerlin, Tasha E.; Raffield, Laura M.; Armasu, Sebastian M.; Wheeler, Marsha M.; Sabino, Ester C.; Blangero, John; Williams, L. Keoki; Levy, Bruce; Sheu, Wayne Huey-Herng; Roden, Dan M.; Boerwinkle, Eric; Manson, JoAnn; Mathias, Rasika A.; Desai, Pinkal; Taylor, Kent D.; Johnson, Andrew D.; Auer, Paul L.; Kooperberg, Charles; Laurie, Cathy C.; Blackwell, Thomas W.; Smith, Albert V.; Zhao, Hongyu; Lange, Ethan; Lange, Leslie; Rich, Stephen S.; Rotter, Jerome I.; Wilson, James G.; Scheet, Paul; Kitzman, Jacob O.; Lander, Eric; Engreitz, Jesse; Ebert, Benjamin; Reiner, Alexander P.; Jaiswal, Siddhartha; Abecasis, Gonçalo; Sankaran, Vijay; Kathiresan, Sekar; Natarajan, Pradeep
    Age is the dominant risk factor for most chronic human diseases; yet the mechanisms by which aging confers this risk are largely unknown. Recently, the age-related acquisition of somatic mutations in regenerating hematopoietic stem cell populations leading to clonal expansion was associated with both hematologic cancer and coronary heart disease5, a phenomenon termed ‘Clonal Hematopoiesis of Indeterminate Potential’ (CHIP). Simultaneous germline and somatic whole genome sequence analysis now provides the opportunity to identify root causes of CHIP. Here, we analyze high-coverage whole genome sequences from 97,691 participants of diverse ancestries in the NHLBI TOPMed program and identify 4,229 individuals with CHIP. We identify associations with blood cell, lipid, and inflammatory traits specific to different CHIP genes. Association of a genome-wide set of germline genetic variants identified three genetic loci associated with CHIP status, including one locus at TET2 that was African ancestry specific. In silico-informed in vitro evaluation of the TET2 germline locus identified a causal variant that disrupts a TET2 distal enhancer resulting in increased hematopoietic stem cell self-renewal. Overall, we observe that germline genetic variation shapes hematopoietic stem cell function leading to CHIP through mechanisms that are both specific to clonal hematopoiesis and shared mechanisms leading to somatic mutations across tissues.