osteopetrosis/protease

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[A benign form of osteopetrosis. Case report].

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Osteopetrosis is a disease in which a disturbance in the resorption of bone formed by endochondral ossification takes place. The cause of the osteoclast insufficiency is unknown. In the literature, the etiology of the disease is discussed in relation to the complete absence of cathepsin K synthesis,

Cathepsin K knockout mice develop osteopetrosis due to a deficit in matrix degradation but not demineralization.

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Cathepsin K is a cysteine protease expressed predominantly in osteoclasts. Activated cathepsin K cleaves key bone matrix proteins and is believed to play an important role in degrading the organic phase of bone during bone resorption. Mutations in the human cathepsin K gene have been demonstrated to

Linking osteopetrosis and pycnodysostosis: regulation of cathepsin K expression by the microphthalmia transcription factor family.

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Various genetic conditions produce dysfunctional osteoclasts resulting in osteopetrosis or osteosclerosis. These include human pycnodysostosis, an autosomal recessive syndrome caused by cathepsin K mutation, cathepsin K-deficient mice, and mitf mutant rodent strains. Cathepsin K is a highly

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

pH regulators in invadosomal functioning: proton delivery for matrix tasting.

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Invadosomes are actin-rich finger-like cellular structures sensing and interacting with the surrounding extracellular matrix (ECM) and involved in its proteolytic remodeling. Invadosomes are structures distinct from other adhesion complexes, and have been identified in normal cells that have to

Potent and selective inhibition of human cathepsin K leads to inhibition of bone resorption in vivo in a nonhuman primate.

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Cathepsin K is a cysteine protease that plays an essential role in osteoclast-mediated degradation of the organic matrix of bone. Knockout of the enzyme in mice, as well as lack of functional enzyme in the human condition pycnodysostosis, results in osteopetrosis. These results suggests that

In vitro chondrocyte differentiation using costochondral chondrocytes as a source of primary rat chondrocyte cultures: an improved isolation and cryopreservation method.

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BACKGROUND Isolating and culturing primary chondrocytes such that they retain their cell type and differentiate to a hypertrophic state is central to many investigations of skeletal growth and its regulation. The ability to store frozen chondrocytes has additional scientific and tissue engineering

Cathepsin K and the design of inhibitors of cathepsin K.

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Cathepsin K, a cysteine protease of the papain family, was identified by sequencing complementary DNA libraries derived from osteoclasts. Cathepsin K can cleave bone proteins such as Type I collagen, osteopontin, and osteonectin. The localization and maturation of cathepsin K in activated

Formation and function of the ruffled border in osteoclasts.

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Osteoclasts are multinucleated hematopoietic cells specialised for bone resorption. Dissolution of the inorganic fraction of the bone matrix is mediated by acidification of the bone surface in contact with the osteoclast whereas secreted lysosomal enzymes digest organic components. Through massive

Recent advances toward understanding osteoclast physiology.

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Osteoclasts develop from precursor cells of the monocyte series. However, specialized differentiation for efficient bone degradation separates the osteoclast from the macrophage. The physical reasons for these differences are emerging from the study of osteoclastic physiology and biochemistry. Key

Regulation of lysosome biogenesis and functions in osteoclasts.

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In order to resorb the mineralized bone extracellular matrix, the osteoclast relies on the generation of a resorption lacuna characterized by the presence of specific proteases and a low pH. Hence, bone resorption by osteoclasts is highly dependent on lysosomes, the organelles specialized in intra-

Altered hematopoietic stem cell and osteoclast precursor frequency in cathepsin K null mice.

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Cathepsin K (CatK) is a lysosomal cysteine protease necessary for bone resorption by osteoclasts (OCs), which originate from myeloid hematopoietic precursors. CatK-deficient (CatK(-/-) ) mice show osteopetrosis due to defective resorption by OCs, which are increased in number in these mice. We

Degradation of the organic phase of bone by osteoclasts: a secondary role for lysosomal acidification.

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Osteoclasts degrade bone matrix by secretion of hydrochloric acid and proteases. We studied the processes involved in the degradation of the organic matrix of bone in detail and found that lysosomal acidification is involved in this process and that MMPs are capable of degrading the organic matrix

Bone density, strength, and formation in adult cathepsin K (-/-) mice.

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Cathepsin K (CatK) is a cysteine protease expressed predominantly in osteoclasts, that plays a prominent role in degrading Type I collagen. Growing CatK null mice have osteopetrosis associated with a reduced ability to degrade bone matrix. Bone strength and histomorphometric endpoints in young adult

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