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Increasing expression of hypoxia-inducible proteins in the Barrett's metaplasia-dysplasia-adenocarcinoma sequence.

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Hypoxia-associated markers are involved in the progression of several malignancies, but are relatively unstudied in Barrett's carcinogenesis. Our aim was to assess the immunohistochemical expression of hypoxia-inducible factor (HIF)-1alpha, HIF-2alpha, erythropoietin (Epo), Epo receptor (Epo-R),

Evidence for hypoxia-induced neuronal-to-chromaffin metaplasia in neuroblastoma.

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We present evidence that in neuroblastoma, a pediatric malignancy of embryonal sympathetic origin, hypoxia, underlies a phenotypic switch from a primitive neuronal to a chromaffin cell type. This conclusion is based on morphological and molecular data on 116 clinical tumors and is supported by data

Mast cells and hypoxia drive tissue metaplasia and heterotopic ossification in idiopathic arthrofibrosis after total knee arthroplasty.

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BACKGROUND Idiopathic arthrofibrosis occurs in 3-4% of patients who undergo total knee arthroplasty (TKA). However, little is known about the cellular or molecular changes involved in the onset or progression of this condition. To classify the histomorphologic changes and evaluate potential

Hypoxia pathways and cellular stress activate pancreatic stellate cells: development of an organotypic culture model of thick slices of normal human pancreas.

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Pancreatic stellate cells (PSC) are involved in fibrogenesis and oncogenesis by modulating the extracellular matrix. OBJECTIVE To evaluate the effect of cellular stress on PSC activation using a model of normal human pancreatic tissue slices culture preserving the microenvironment. METHODS Thin

Loss of hypoxia-inducible factor 2 alpha in the lung alveolar epithelium of mice leads to enhanced eosinophilic inflammation in cobalt-induced lung injury.

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Hard metal lung disease (HMLD) is an occupational lung disease specific to inhalation of cobalt-containing particles whose mechanism is largely unknown. Cobalt is a known hypoxia mimic and stabilizer of the alpha subunits of hypoxia-inducible factors (HIFs). Previous work revealed that though HIF1α

Chronic hypoxia induces nonreversible right ventricle dysfunction and dysplasia in rats.

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The purpose of this study was to evaluate the reversibility of right ventricular (RV) remodelling after pulmonary artery hypertension (PAHT) secondary to 3 wk of hypobaric hypoxia. A group of 10 adult male Wistar rats were studied and were the following: control normoxic (C), after 3 wk of chronic

Agnogenic myeloid metaplasia with pulmonary hematopoiesis.

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Agnogenic myeloid metaplasia (AMM) is characterized by bone marrow fibrosis, splenomegaly and leukoerythroblastic anemia and is frequently accompanied by extramedullary hematopoiesis (EMH). Pulmonary interstitial EMH associated with myelofibrosis has rarely been described in the medical literature

Immunohistochemical detection of GLUT1, p63 and phosphorylated histone H1 in head and neck squamous intraepithelial neoplasia: evidence for aberrations in hypoxia-related, cell cycle- and stem-cell-regulatory pathways.

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OBJECTIVE Most epithelial malignancies are characterized by multistep progression from preinvasive/intraepithelial neoplasia to invasive malignancy. Detection and grading of early squamous intraepithelial neoplasia may at times be problematic. The aim of this study was to examine the ability of

Prostatic atrophy: immunohistochemical study of hypoxia induced factors.

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BACKGROUND There is evidence that chronic local ischemia may be one possible etiology of prostatic atrophy (PA). Our aim was to study the expression of hypoxia induced factors in areas of PA. METHODS The immunohistochemical expression of hypoxia-inducible factor-1 alpha (HIF-1) and vascular

Hypoxia-associated markers in gastric carcinogenesis and HIF-2alpha in gastric and gastro-oesophageal cancer prognosis.

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The study investigated hypoxia-associated markers (HIF-2alpha, Epo, Epo-R, Glut-1 and VEGF) along with Ki-67 in a gastric carcinogenesis model, and the prognostic significance of hypoxia-inducible factor (HIF)-2alpha in surgically treated gastro-oesophageal cancer. Protein expression was examined

Constitutive activation of signal transducers and activators of transcription 3 correlates with better prognosis, cell proliferation and hypoxia-inducible factor-1α in human gastric cancer.

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OBJECTIVE We aimed to investigate the biological significance of signal transducers and activators of transcription 3 (STAT3) in gastric carcinoma. METHODS Immunohistochemistry was performed on tissue array slides containing 285 gastric carcinoma specimens. The relationship between the nuclear

Exposure to intermittent hypoxia inhibits allergic airway inflammation in a murine model of asthma.

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Obesity increases the severity of asthma, and patients with severe asthma are often complicated with obstructive sleep apnea syndrome (OSAS), a concomitant disease of obesity. We investigated whether intermittent hypoxia (IH), which is a physiological feature of OSAS, modifies allergic

A new mouse model of Peyronie's disease: an increased expression of hypoxia-inducible factor-1 target genes during the development of penile changes.

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Peyronie's disease (PD) is characterized by an inflammatory response beneath the tunica albuginea with fibroblast proliferation forming a thickened fibrous plaque that may cause pain, penile curvature and erectile dysfunction. The progression of the PD plaque may eventually lead to calcification or

Low-dose, single-fraction, whole-lung radiotherapy for pulmonary hypertension associated with myelofibrosis with myeloid metaplasia.

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Pulmonary hypertension (PH) can complicate myelofibrosis with myeloid metaplasia (MMM), may arise in the absence of evidence for thromboembolic disease and carries a grim prognosis. Four patients with MMM and severe symptomatic PH were treated with whole-lung external beam radiotherapy in a single

HIF-1alpha protein expression is associated with the environmental inflammatory reaction in Barrett's metaplasia.

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The oxygen-regulated transcription factor subunit hypoxia inducible factor-1alpha (HIF-1alpha) is involved in angiogenesis, energy metabolism, cell survival, and inflammation. We examined the protein expression of HIF-1alpha within the progression of Barrett's sequence as well as the type and degree

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