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Fibroblasts in cholesteatoma activate osteoclasts.

ABSTRACT: Fibroblasts in cholesteatoma activate osteoclasts.

PROVIDER: PRJNA477370 | ENA |

REPOSITORIES: ENA

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Fibroblasts in cholesteatoma activate osteoclasts.

Project description:Cholesteatoma arises from a tympanic membrane and expands in the middle ear. It erodes the surrounding bone and leads to hearing loss or brain abscess which is lethal complication. Currently, the only effective treatment is the complete surgical removal of cholesteatoma. However, possibility of recurrence is not satisfactory, other clinical treatment is desired. A mechanism of bone erosion in rheumatoid arthritis, which is one of the bone destructive disease, is progressing to be clarified. Receptor activator of NF-κB ligand (RANKL) secreted by synovial fibroblasts, T cells, and B cells lead to differentiation and activation of osteoclast precursor in rheumatoid arthritis. In contrast it has been still unclear why cholesteatoma erodes bone. In the current study we studied that osteoclasts statistically increased in cholesteatoma, and that fibroblasts in the prematrix of cholesteatoma express RANKL. In this study we studied that osteoclasts statistically increased in cholesteatoma, and that fibroblasts in the prematrix of cholesteatoma express RANKL. We investigated upstream of RANKL from RNA sequence results by Ingenuity Pathways Analysis, which is data base of abundance information about molecular biology.

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Project description:Bisphosphonates are the mainstay of therapy worldwide for osteoporosis. They inhibit the activities of the osteoclasts, the bone resorption cells. While bisphosphonates are known to block farnesyl pyrophsophate synthase to exert their anti-resorptive action, the detailed mechanism is not well understood. Examining the change in expression profile before and after bisphosphonate treatment in the osteoclasts might shed some light on the biological pathways that are perturbed. Osteoclastic precursor cells were treated with (or without) bisphosphonates (alendronate or risedronate) during their differentiation into mature osteoclasts.

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SQSTM1-interacting proteins in human osteoclasts

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Single-cell transcriptomics of human cholesteatoma identifies an activin A-producing osteoclastogenic fibroblast subset inducing bone destruction

Project description:To elucidate the mechanism underlying bone erosion in cholesteatoma, we performed scRNA-seq using human cholesteatoma tissues surgically resected from patients. We focused on pathogenic fibroblasts or keratinocytes, and therefore CD45-negative cells were collected for scRNA-seq analysis to exclude hematopoietic cell lineages. As there are no “normal” tissues in the middle ear that correspond to cholesteatoma, retroauricular skin at the incision site was used as the control for analysis of cholesteatoma. We dentified a characteristic pathogenic fibroblast subset with abundant expression of inhibin βA.

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Expression data from cultured macrophages and osteoclasts

Project description:Osteoclastogenesis is induced by the stimulation of RANKL. In the early stage of osteoclast differentiation, the osteoclast progenitor cells are primed by M-CSF, following a tightly controlled genetic program where specific sets of genes are up-regulated by RANKL. Some of them, for instance, control differentiation, cell-cell fusion and bone resorption. We used microarrays to detail the global program of gene expression underlying osteoclastogenesis and identified various up-regulated genes during this process. Macrophages and osteoclasts were cultured for RNA extraction and hybridization on Affymetrix microarrays. We sought to obtain homogeneous populations of macrophages and osteoclasts in order to increase the temporal resolution of expression profiles. To that end, mouse bone marrow cells were cultured in the presence of M-CSF for three days and harvested as macrophage and oseteoclast common progenitor cells. Then common progenitor cells were further cultured in the presence of M-CSF alone for macrophages and M-CSF plus RANKL for osteoclasts, respectively.

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