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bone resorption/protease
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[Effects of protease inhibitors and protein synthesis inhibitors on cartilage tissue-dependent bone resorption].
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We studied bone resorption of fetal rat femora in association with cartilage tissue. Some protease inhibitors, e.g., E-64, pepstatin A, phosphoramidon, amastatin, bestatin, foroxymithine, did not influence the bone resorption, but some serine protease inhibitors such as PMSF, TLCK, TPCK and
V-ATPase subunit ATP6AP1 (Ac45) regulates osteoclast differentiation, extracellular acidification, lysosomal trafficking, and protease exocytosis in osteoclast-mediated bone resorption.
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Lysosomal trafficking and protease exocytosis in osteoclasts are essential for ruffled border formation and bone resorption. Yet the mechanism underlying lysosomal trafficking and the related process of exocytosis remains largely unknown. We found ATP6ap1 (Ac45), an accessory subunit of
Impaired bone resorption in cathepsin K-deficient mice is partially compensated for by enhanced osteoclastogenesis and increased expression of other proteases via an increased RANKL/OPG ratio.
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Previous reports indicate that mice deficient for cathepsin K (Ctsk), a key protease in osteoclastic bone resorption, develop osteopetrosis due to their inability to properly degrade organic bone matrix. Some features of the phenotype of Ctsk knockout mice, however, suggest the presence of
Matrix metalloproteinases and lysosomal cysteine proteases in osteoclasts contribute to bone resorption through distinct modes of action.
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The effects of inhibitors of matrix metalloproteinases (MMPs) and lysosomal cysteine proteases on osteoclastic pit formation in dentine slices were investigated. A nonspecific cysteine protease inhibitor, E-64, inhibited pit formation on naked slices in a concentration-dependent manner, and at 10
Oligogalacturonic acid inhibit bone resorption and collagen degradation through its interaction with type I collagen.
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In this study, we showed that oligogalacturonic acid (OGA) purified from flax pectin inhibit in vitro osteoclastic bone resorption in a dose-dependent manner. The OGA inhibitory effect was neither linked to an effect on osteoclast apoptosis, nor to an inhibition of cathepsin K activity. By means of
Optimized transfection of diced siRNA into mature primary human osteoclasts: inhibition of cathepsin K mediated bone resorption by siRNA.
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Osteoclasts are large multinucleated cells responsible for bone resorption. Bone resorption is dependent on the liberation of calcium by acid and protease destruction of the bone matrix by proteinases. The key proteinase produced by the osteoclast is cathepsin K. Targeted knock-down of cathepsin K
Human cathepsin O2, a matrix protein-degrading cysteine protease expressed in osteoclasts. Functional expression of human cathepsin O2 in Spodoptera frugiperda and characterization of the enzyme.
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Cathepsin O2, a human cysteine protease predominantly present in osteoclasts, has been functionally expressed in Spodoptera frugiperda Sf9 cells using the Autographa californica nuclear polyhedrosis virus. Following in vitro activation at pH 4.0 with pepsin, active enzyme with an apparent molecular
Distinct roles of cathepsin K and cathepsin L in osteoclastic bone resorption.
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The role of cathepsin K (CAK), cloned as a novel collagenolytic cysteine protease (CCP), cathepsin L (CAL) and cathepsin B (CAB) in bone resorption was investigated. In mouse calvarial organ culture medium, CAL, detected in trace amounts in control conditions, and CCP activity were increased by
Cathepsin K antisense oligodeoxynucleotide inhibits osteoclastic bone resorption.
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Cathepsin K is a recently identified cysteine protease which is abundantly and selectively expressed in osteoclasts. To evaluate the contribution of cathepsin K to bone resorption processes, we investigated the effect of cathepsin K antisense phosphothiorate oligodeoxynucleotide (S-ODN) on the
Cystatin C in milk basic protein (MBP) and its inhibitory effect on bone resorption in vitro.
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A cystein protease inhibitor was identified in the basic fraction of bovine milk. We have reported in our previous study that the milk basic protein (MBP) fraction suppressed osteoclast-mediated bone resorption in vitro. Since osteoclasts secreted cystein protease to digest collagen in the bone
Ketoamide-based inhibitors of cysteine protease, cathepsin K: P3 modifications.
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Osteoporosis is a disease characterized by skeletal fragility. Cathepsin K, a lysosomal cysteine protease, has been implicated in the osteoclast mediated bone resorption. Inhibitors of this protease could potentially treat this skeletal disease. The present work describes exploration of the spatial
Cysteine protease production by human osteosarcoma cells (MG63, SAOS2) and its modulation by soluble factors.
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The production of cysteine protease by two human osteosarcoma cell lines (MG-63 and SaOS2) was analyzed, as well as their modulation by interleukin 1beta (hIL-1 beta), interleukin 6 (hIL-6), insulin growth factor-1 (hIGF-1), oncostatin M (hOSM), leukemia inhibitory factor (hLIF) and growth hormone
Metabolic activation stimulates acid secretion and expression of matrix degrading proteases in human osteoblasts.
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BACKGROUND
Both cellular and matrix components of healthy bone are permanently renewed in a balanced homoeostasis. Osteoclastic bone resorption involves the expression of vacuolar-type ATPase proton pumps (vATPase) on the outer cell membrane and the secretion of matrix degrading proteases.
Histochemical localization of neutral proteases released during development of rat periradicular lesion.
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OBJECTIVE
The purpose of the present study was to examine the role of various neutral proteases released during the development of periradicular lesion.
METHODS
This lesion produced by pulpal exposure of mandibular first molar in rat. The histological and histometrical changes in periapical tissue
PTH-induced osteoblast contraction is mediated by cysteine proteases.
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E-64d, a membrane-permeable cysteine protease inhibitor, was tested for its ability to inhibit PTH-induced contraction in intact mouse MC-3T3-E1 osteoblastic cells. Incubation of MC-3T3-E1 cells with vehicle (DMSO) or E-64c, a nonpermeant cysteine protease inhibitor, in the presence or in the
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