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paraganglioma/hypoxia
L'enllaç es desa al porta-retalls
Pàgina 1 des de 174 resultats
Hypoxia-Inducible Factor 2α Mutation-Related Paragangliomas Classify as Discrete Pseudohypoxic Subcluster.
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Recently, activating mutations of the hypoxia-inducible factor 2α gene (HIF2A/EPAS1) have been recognized to predispose to multiple paragangliomas (PGLs) and duodenal somatostatinomas associated with polycythemia, and ocular abnormalities. Previously, mutations in the SDHA/B/C/D, SDHAF2, VHL, FH,
Clinical significance and peculiarities of succinate dehydrogenase B and hypoxia inducible factor 1α expression in parasympathetic versus sympathetic paragangliomas.
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Retroperitoneal paraganglioma in a patient with Fontan: The hypoxia connection.
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Paragangliomas are rare neuroendocrine tumors where hypoxia-inducible factor plays a critical role in tumorigenesis. It has been suggested that patients with congenital heart disease, in particular, may have cellular environment and relative hypoxia favorable to the development of these
Recent advances in the management of malignant pheochromocytoma and paraganglioma: focus on tyrosine kinase and hypoxia-inducible factor inhibitors.
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Inactivating mutations of the succinate dehydrogenase subunit B ( SDHB) gene and the subsequent stabilization and activation of the hypoxia-inducible factor 2-alpha (HIF2α) unit are recognized hallmarks associated with the development of metastatic pheochromocytomas and paragangliomas (MPPG).
Overexpression of the natural antisense hypoxia-inducible factor-1alpha transcript is associated with malignant pheochromocytoma/paraganglioma.
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Paragangliomas (PGLs) have widely different metastastic potentials. Two different types of PGLs can be defined by expression profiling. Cluster 1 PGLs exhibit VHL and/or succinate dehydrogenase (SDH) mutations and a pseudohypoxic phenotype. RET and neurofibromatosis type 1 (NF1) mutations occur in
Metabolic implications of hypoxia and pseudohypoxia in pheochromocytoma and paraganglioma.
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Hypoxia is a critical driver of cancer pathogenesis, directly inducing malignant phenotypes such as epithelial-mesenchymal transition, stem cell-like characteristics and metabolic transformation. However, hypoxia-associated phenotypes are often observed in cancer in the absence of hypoxia, a
Mutation of SDHB is a cause of hypoxia-related high-altitude paraganglioma.
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OBJECTIVE
Paragangliomas of the head and neck are neuroendocrine tumors and are associated with germ line mutations of the tricarboxylic acid cycle-related genes SDHB, SDHC, SDHD, and SDHAF2. Hypoxia is important in most solid tumors, and was directly implicated in tumorigenesis over 40 years ago
SDHB loss predicts malignancy in pheochromocytomas/sympathethic paragangliomas, but not through hypoxia signalling.
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Prediction of malignant behaviour of pheochromocytomas/sympathetic paragangliomas (PCCs/PGLs) is very difficult if not impossible on a histopathological basis. In a familial setting, it is well known that succinate dehydrogenase subunit B (SDHB)-associated PCC/PGL very often metastasise. Recently,
Hypoxia Pathway Mutations in Pheochromocytomas and Paragangliomas.
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Pheochromocytomas (PCC) and sympathetic paragangliomas (PGL) are rare neuroendocrine tumors, which derive from chromaffin cells occurring in the adrenal medulla and extra-adrenal sympathetic paraganglia. PCC and PGL are often benign, catecholamine-producing tumors, responsible for a myriad of
The R22X mutation of the SDHD gene in hereditary paraganglioma abolishes the enzymatic activity of complex II in the mitochondrial respiratory chain and activates the hypoxia pathway.
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Hereditary paragangliomas are usually benign tumors of the autonomic nervous system that are composed of cells derived from the primitive neural crest. Even though three genes (SDHD, SDHC, and SDHB), which encode three protein subunits of cytochrome b of complex II in the mitochondrial respiratory
Chronic hypoxia and chemodectomas in bovines at high altitudes.
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A severe degree of hyperplasia of the chief cells occurs in bovine carotid bodies at high altitudes, compared to sea level. As a result, the carotid body from an animal at high altitudes is significantly heavier and larger than the carotid body from an animal at sea level (P less than .001). In
Chronic hypoxemia and paraganglioma: a rare case and discussion of potential mechanisms.
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Ocular manifestations of hypoxia-inducible factor-2α paraganglioma-somatostatinoma-polycythemia syndrome.
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Carotid body paraganglioma regression with relief of hypoxemia.
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[Does chronic hypoxemia favor the appearance of paragangliomas?].
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