chondroma/phosphatase

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Selective increase in expression of isoform PP1 gamma 1 of type-1 protein phosphatase in chondrosarcoma cells.

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The expression of the two catalytic subunits of protein phosphatase (PP) type 1 PP1 gamma 1 and PP1 delta was examined in 4 cases of osteochondroma and 4 cases of enchondroma as a benign cartilaginous tumor, and 4 cases of chondrosarcoma as a malignant cartilaginous tumor using immunohistochemical

A rare association of pathological variant of Alport's syndrome caused by hemizygous 5' splice mutation in intron 10 of COL4A5 gene with metachondromatosis due to heterozygous missense variation in protein tyrosine phosphatase nonreceptor type 11 gene.

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Metachondromatosis is a rare disorder of autosomal inheritance with incomplete penetrance, which is characterized by formation of osteochondroma and enchondroma, caused by loss of function of the protein tyrosine phosphatase nonreceptor type 11 (PTPN11) gene. Diagnosis is made based on the

Role of protein phosphatase in malignant osteogenic and soft tissue tumors.

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The expression of the three catalytic subunits of protein phosphatase (PP) type 1 and 2A, PP1 alpha, PP1 gamma 1, and PP2AC, was examined in osteogenic tumors and soft tissue tumors by immunohistochemical analysis. The percentage of cells stained positively with antiserum against PP1 catalytic

Enzyme histochemical study on bone tumors.

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A total of 19 cases with bone tumors, including six osteosarcomas. three giant cell tumors of bone, one malignant fibrous histiocytoma, four nonossifying fibromas, four chondromas and one chondrosarcoma, were examined as to enzyme histochemistry; the enzymes consisted of alkaline phosphatase

Matrix vesicles in bone tumors. Ultrastructural analysis and their significance in neoplastic bone formation.

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Bone tumors were categorized into alkaline phosphatase (ALPase)-positive (2 ossifying fibromas, 1 benign osteoblastoma and 16 osteosarcomas) and negative (2 chondromas, 2 chondrosarcomas, 3 non-ossifying fibromas, 2 malignant fibrous histiocytomas and 6 giant cell tumors of bone) groups. Production

Intraosseous atypical chondroid tumor or chondrosarcoma grade 1 in patients with multiple osteochondromas.

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BACKGROUND The autosomal dominant condition multiple osteochondromas, formerly called multiple hereditary exostoses, is associated with a risk of malignant progression of osteochondroma into secondary peripheral chondrosarcoma. Most patients with multiple osteochondromas have exostosin-1 or

Symmetrical enchondromatosis of the hands and feet in two sisters.

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We report two Portuguese sisters aged 9 and 12 years with symmetric well-circumscribed radiolucent cystic lesions on the long bone metaphysis of the hands and feet. The eldest also has soft tissue calcifications. They have no dysmorphic features and their growth is normal. Plasma values of

Targeted disruption of Shp2 in chondrocytes leads to metachondromatosis with multiple cartilaginous protrusions.

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Metachondromatosis is a benign bone disease predominantly observed in the hands and feet of children or young adults demonstrating two different manifestations: a cartilage-capped bony outgrowth on the surface of the bone called exostosis and ectopic cartilaginous nodules inside the bone called

From an orphan disease to a generalized molecular mechanism: PTPN11 loss-of-function mutations in the pathogenesis of metachondromatosis.

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Recently, loss-of-function mutations in PTPN11 were linked to the cartilage tumor syndrome metachondromatosis (MC), a rare inherited disorder featuring osteochondromas, endochondromas and skeletal deformation. However, the underlying molecular and cellular mechanism for MC remained incompletely

PTEN deficiency causes dyschondroplasia in mice by enhanced hypoxia-inducible factor 1alpha signaling and endoplasmic reticulum stress.

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Chondrocytes within the growth plates acclimatize themselves to a variety of stresses that might otherwise disturb cell fate. The tumor suppressor PTEN (phosphatase and tensin homolog deleted from chromosome 10) has been implicated in the maintenance of cell homeostasis. However, the functions of

Ptpn11 deletion in a novel progenitor causes metachondromatosis by inducing hedgehog signalling.

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The tyrosine phosphatase SHP2, encoded by PTPN11, is required for the survival, proliferation and differentiation of various cell types. Germline activating mutations in PTPN11 cause Noonan syndrome, whereas somatic PTPN11 mutations cause childhood myeloproliferative disease and contribute to some

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