This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. While it is well known that bone mass changes in response to biomechanical loading, the fundamental cellular mechanisms that regulate these changes remain unknown. It is often assumed that the primary mechanosensory cell in bone is the osteocyte, but this assessment is based on indirect evidence and other bone cells may also play a role. If the osteocyte is in fact the primary mechanosensor in bone, it is not clear how these cells, which are encapsulated in canals within the mineralized bone matrix, would signal osteoclast and osteoblast cells to regulate bone resorption and synthesis. Because of their placement within the bone in vivo, the cellular mechanisms remain elusive. Recently, we have built an optical stretcher which is a novel laser-based device for studying the mechanical properties of individual cells. High intensity near-infrared laser light conveyed by two collinear optical fibers forms an optical trap that holds and deforms isolated cells. This instrument allows well defined and controlled mechanical stress to be applied to a single cell while precisely measuring the resulting deformation. This provides a quantitative measure of the mechanical stiffness of an individual cell. We propose to employ the optical stretcher to measure and compare the biomechanical characteristics of two osteogenic cell lines, osteoblasts and osteocytes, as well as one non-osteogenic cell line for comparison. We will then systematically quantify the mechanosensory potential of each cell line by two biochemical assays. First, we will measure intercellular calcium levels during a physiologically significant stretch by confocal imaging of the cell within the stretcher. We will also collect populations of cells that have received the same stretch and measure the expression of two genes implicated in the bone response to skeletal loading: inducible nitric oxide synthase and prostaglandin G/H synthase 2. These experiments will provide a direct test of the hypothesis that the unique biomechanical properties of the osteocyte enable them to function as the primary mechanosensors within bone.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Exploratory Grants (P20)
Project #
2P20RR016469-09
Application #
7960280
Study Section
Special Emphasis Panel (ZRR1-RI-4 (01))
Project Start
2009-05-01
Project End
2010-04-30
Budget Start
2009-05-01
Budget End
2010-04-30
Support Year
9
Fiscal Year
2009
Total Cost
$13,209
Indirect Cost
Name
University of Nebraska Medical Center
Department
Genetics
Type
Schools of Medicine
DUNS #
168559177
City
Omaha
State
NE
Country
United States
Zip Code
68198
Barta, Cody L; Liu, Huizhan; Chen, Lei et al. (2018) RNA-seq transcriptomic analysis of adult zebrafish inner ear hair cells. Sci Data 5:180005
Liu, Huizhan; Chen, Lei; Giffen, Kimberlee P et al. (2018) Cell-Specific Transcriptome Analysis Shows That Adult Pillar and Deiters' Cells Express Genes Encoding Machinery for Specializations of Cochlear Hair Cells. Front Mol Neurosci 11:356
Wehrkamp, Cody J; Natarajan, Sathish Kumar; Mohr, Ashley M et al. (2018) miR-106b-responsive gene landscape identifies regulation of Kruppel-like factor family. RNA Biol 15:391-403
Lopez, Wilfredo; Page, Alexis M; Carlson, Darby J et al. (2018) Analysis of immune-related genes during Nora virus infection of Drosophila melanogaster using next generation sequencing. AIMS Microbiol 4:123-139
Gong, Qiang; Wang, Chao; Zhang, Weiwei et al. (2017) Assessment of T-cell receptor repertoire and clonal expansion in peripheral T-cell lymphoma using RNA-seq data. Sci Rep 7:11301
Lu, Guoqing; Luhr, Jamie; Stoecklein, Andrew et al. (2017) Complete Genome Sequences ofPseudomonas fluorescensBacteriophages Isolated from Freshwater Samples in Omaha, Nebraska. Genome Announc 5:
Azadmanesh, Jahaun; Trickel, Scott R; Weiss, Kevin L et al. (2017) Preliminary neutron diffraction analysis of challenging human manganese superoxide dismutase crystals. Acta Crystallogr F Struct Biol Commun 73:235-240
Bouska, A; Zhang, W; Gong, Q et al. (2017) Combined copy number and mutation analysis identifies oncogenic pathways associated with transformation of follicular lymphoma. Leukemia 31:83-91
Azadmanesh, Jahaun; Trickel, Scott R; Borgstahl, Gloria E O (2017) Substrate-analog binding and electrostatic surfaces of human manganese superoxide dismutase. J Struct Biol 199:68-75
Bonham-Carter, Oliver; Thapa, Ishwor; From, Steven et al. (2017) A study of bias and increasing organismal complexity from their post-translational modifications and reaction site interplays. Brief Bioinform 18:69-84

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