scholarly journals Genome-Wide Mapping and Interrogation of the Nmp4 Antianabolic Bone Axis

2015 ◽  
Vol 29 (9) ◽  
pp. 1269-1285 ◽  
Author(s):  
Paul Childress ◽  
Keith R. Stayrook ◽  
Marta B. Alvarez ◽  
Zhiping Wang ◽  
Yu Shao ◽  
...  

Abstract PTH is an osteoanabolic for treating osteoporosis but its potency wanes. Disabling the transcription factor nuclear matrix protein 4 (Nmp4) in healthy, ovary-intact mice enhances bone response to PTH and bone morphogenetic protein 2 and protects from unloading-induced osteopenia. These Nmp4−/− mice exhibit expanded bone marrow populations of osteoprogenitors and supporting CD8+ T cells. To determine whether the Nmp4−/− phenotype persists in an osteoporosis model we compared PTH response in ovariectomized (ovx) wild-type (WT) and Nmp4−/− mice. To identify potential Nmp4 target genes, we performed bioinformatic/pathway profiling on Nmp4 chromatin immunoprecipitation sequencing (ChIP-seq) data. Mice (12 w) were ovx or sham operated 4 weeks before the initiation of PTH therapy. Skeletal phenotype analysis included microcomputed tomography, histomorphometry, serum profiles, fluorescence-activated cell sorting and the growth/mineralization of cultured WT and Nmp4−/− bone marrow mesenchymal stem progenitor cells (MSPCs). ChIP-seq data were derived using MC3T3-E1 preosteoblasts, murine embryonic stem cells, and 2 blood cell lines. Ovx Nmp4−/− mice exhibited an improved response to PTH coupled with elevated numbers of osteoprogenitors and CD8+ T cells, but were not protected from ovx-induced bone loss. Cultured Nmp4−/− MSPCs displayed enhanced proliferation and accelerated mineralization. ChIP-seq/gene ontology analyses identified target genes likely under Nmp4 control as enriched for negative regulators of biosynthetic processes. Interrogation of mRNA transcripts in nondifferentiating and osteogenic differentiating WT and Nmp4−/− MSPCs was performed on 90 Nmp4 target genes and differentiation markers. These data suggest that Nmp4 suppresses bone anabolism, in part, by regulating IGF-binding protein expression. Changes in Nmp4 status may lead to improvements in osteoprogenitor response to therapeutic cues.

Oncotarget ◽  
2018 ◽  
Vol 9 (62) ◽  
pp. 32024-32035 ◽  
Author(s):  
Anne-Marit Sponaas ◽  
Rui Yang ◽  
Even Holth Rustad ◽  
Therese Standal ◽  
Aud Solvang Thoresen ◽  
...  

2020 ◽  
Vol 21 (13) ◽  
pp. 4661 ◽  
Author(s):  
Lavinia Casati ◽  
Francesca Pagani ◽  
Roberto Maggi ◽  
Francesco Ferrucci ◽  
Valeria Sibilia

Bone remodeling and repair require osteogenic cells to reach the sites that need to be rebuilt, indicating that stimulation of osteoblast migration could be a promising osteoanabolic strategy. We showed that purified δ-tocotrienol (δ-TT, 10 μg/mL), isolated from commercial palm oil (Elaeis guineensis) fraction, stimulates the migration of both MC3T3-E1 osteoblast-like cells and primary human bone marrow mesenchymal stem cells (BMSC) as detected by wound healing assay or Boyden chamber assay respectively. The ability of δ-TT to promote MC3T3-E1 cells migration is dependent on Akt phosphorylation detected by Western blotting and involves Wnt/β-catenin signalling pathway activation. In fact, δ-TT increased β-catenin transcriptional activity, measured using a Nano luciferase assay and pretreatment with procaine (2 µM), an inhibitor of the Wnt/β-catenin signalling pathway, reducing the wound healing activity of δ-TT on MC3T3-E1 cells. Moreover, δ-TT treatment increased the expression of β-catenin specific target genes, such as Osteocalcin and Bone Morphogenetic Protein-2, involved in osteoblast differentiation and migration, and increased alkaline phosphatase and collagen content, osteoblast differentiation markers. The ability of δ-TT to enhance the recruitment of BMSC, and to promote MC3T3-E1 differentiation and migratory behavior, indicates that δ-TT could be considered a promising natural anabolic compound.


2008 ◽  
Vol 21 (2) ◽  
pp. 189-202 ◽  
Author(s):  
Manuela Avolio ◽  
Sonia Caracciolo ◽  
Giorgio Tosti ◽  
Luana Vollero ◽  
Simona Fiorentini ◽  
...  
Keyword(s):  
T Cells ◽  

2019 ◽  
Vol 49 (6) ◽  
pp. 853-872 ◽  
Author(s):  
Maria Fernanda Pascutti ◽  
Sulima Geerman ◽  
Nicholas Collins ◽  
Giso Brasser ◽  
Benjamin Nota ◽  
...  

2006 ◽  
Vol 11 (1) ◽  
pp. 44-55 ◽  
Author(s):  
Dirk Schlüter ◽  
Timothy Meyer ◽  
Andreas Strack ◽  
Sabine Reiter ◽  
Marianne Kretschmar ◽  
...  

2008 ◽  
Vol 180 (11) ◽  
pp. 7230-7239 ◽  
Author(s):  
Elisabetta Parretta ◽  
Giuliana Cassese ◽  
Angela Santoni ◽  
John Guardiola ◽  
Antonia Vecchio ◽  
...  

2015 ◽  
Vol 89 (21) ◽  
pp. 11019-11029 ◽  
Author(s):  
Frauke Beilstein ◽  
Linda Obiang ◽  
Hélène Raux ◽  
Yves Gaudin

ABSTRACTThe matrix protein (M) of vesicular stomatitis virus (VSV) is involved in virus assembly, budding, gene regulation, and cellular pathogenesis. Using a yeast two-hybrid system, the M globular domain was shown to interact with LMP2, a catalytic subunit of the immunoproteasome (which replaces the standard proteasome catalytic subunit PSMB6). The interaction was validated by coimmunoprecipitation of M and LMP2 in VSV-infected cells. The sites of interaction were characterized. A single mutation of M (I96A) which significantly impairs the interaction between M and LMP2 was identified. We also show that M preferentially binds to the inactive precursor of LMP2 (bearing an N-terminal propeptide which is cleaved upon LMP2 maturation). Furthermore, taking advantage of a sequence alignment between LMP2 and its proteasome homolog, PSMB6 (which does not bind to M), we identified a mutation (L45R) in the S1 pocket where the protein substrate binds prior to cleavage and a second one (D17A) of a conserved residue essential for the catalytic activity, resulting in a reduction of the level of binding to M. The combination of both mutations abolishes the interaction. Taken together, our data indicate that M binds to LMP2 before its incorporation into the immunoproteasome. As the immunoproteasome promotes the generation of major histocompatibility complex (MHC) class I-compatible peptides, a feature which favors the recognition and the elimination of infected cells by CD8 T cells, we suggest that M, by interfering with the immunoproteasome assembly, has evolved a mechanism that allows infected cells to escape detection and elimination by the immune system.IMPORTANCEThe immunoproteasome promotes the generation of MHC class I-compatible peptides, a feature which favors the recognition and the elimination of infected cells by CD8 T cells. Here, we report on the association of vesicular stomatitis virus (VSV) matrix protein (M) with LMP2, one of the immunoproteasome-specific catalytic subunits. M preferentially binds to the LMP2 inactive precursor. The M-binding site on LMP2 is facing inwards in the immunoproteasome and is therefore not accessible to M after its assembly. Hence, M binds to LMP2 before its incorporation into the immunoproteasome. We suggest that VSV M, by interfering with the immunoproteasome assembly, has evolved a mechanism that allows infected cells to escape detection and elimination by the immune system. Modulating this M-induced immunoproteasome impairment might be relevant in order to optimize VSV for oncolytic virotherapy.


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