calcium phosphate/hypoxia

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Calcium phosphate cement chamber as an immunoisolative device for bioartificial pancreas: in vitro and preliminary in vivo study.

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OBJECTIVE This study examined a calcium phosphate cement (CPC) chamber as an immunoisolative device to facilitate the use of xenogeneic cell sources without immunosuppression for the bioartificial pancreas (BAP). METHODS Mouse insulinoma cells were encapsulated in agarose gel and then enclosed in a

Recombinant AAV-PR39-mediated hypoxia-inducible factor 1α gene expression attenuates myocardial infarction.

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PR39 is an angiogenic masterswitch protein, belonging to the second generation of angiogenic growth factors. However, the role of recombinant adeno-associated virus (AAV) carrying the PR39 fusion gene (AAV-PR39) in acute myocardial infarction remains unclear. Therefore, in this study, we

p53-dependent growth arrest following calcium phosphate-mediated transfection of murine fibroblasts.

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A variety of genotoxic agents can induce an accumulation of p53 protein in the nuclei of mammalian cells and lead to either growth arrest or apoptosis in a p53-dependent manner. Recently, the induction of the p53 pathway has also been reported for non-genotoxic agents such as heat shock and hypoxia,

Calcium phosphate glass improves angiogenesis capacity of poly(lactic acid) scaffolds and stimulates differentiation of adipose tissue-derived mesenchymal stromal cells to the endothelial lineage.

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The angiogenic capacity of a new biomaterial composite of poly(lactic acid) and calcium phosphate glass (PLA/CaP) was analyzed by noninvasive bioluminescence imaging (BLI) and histological procedures. Human adipose tissue-derived mesenchymal stromal cells expressing cytomegalovirus (CMV) promoter

Is there a role for uric acid in an animal model of calcium phosphate nephrocalcinosis and calcium phosphate crystallization in urine of patients with idiopathic calcium urolithiasis? An orientational study.

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Uric acid (UA), a waste product of purine metabolism, may be involved in calcium phosphate crystallization and deposition. Rats, which develop nephrocalcinosis on high-fat or magnesium-deficient diets, and patients with idiopathic calcium urolithiasis have hyperproteinuria, especially of nonalbumin

Stimulatory effect of cobalt ions incorporated into calcium phosphate coatings on neovascularization in an in vivo intramuscular model in goats.

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Rapid vascularization of bone graft substitutes upon implantation is one of the most important challenges to overcome in order to achieve successful regeneration of large, critical-size bone defects. One strategy for stimulating vascularization during the regeneration process is to create a hypoxic

Renal transport of bisphosphonates: accumulation by renal cortical slices enhanced by calcium phosphate ions.

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Bisphosphonates have been recognized as useful therapeutic agents in metabolic bone disease. Earlier studies showed a net renal secretion of 1-hydroxy-ethylidene-1,1-bisphosphonate (HEBP). They suggested a renal cellular uptake of this compound. We further studied this concept by investigating the

Culture of hybrid spheroids composed of calcium phosphate materials and mesenchymal stem cells on an oxygen-permeable culture device to predict in vivo bone forming capability.

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Three-dimensional (3-D) cell culture can better mimic physiological conditions in which cells interact with adjacent cells and the extracellular matrix than monolayer culture. We have developed a 3-D cell culture device, the Oxy chip, which can be used to generate and supply oxygen to cell spheroids

The effect of chronic long-term intermittent hypobaric hypoxia on bone mineral density in rats: role of nitric oxide.

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Intermittent hypoxia is the most common pattern of hypoxic exposure in humans. The effect of chronic long-term intermittent hypobaric hypoxia (CLTIHH) on bone metabolism is not investigated. We examined the effect of CLTIHH on bone metabolism and the role of nitric oxide (NO) in this process. The

In vitro and in vivo evaluation of calcium phosphate composite scaffolds containing BMP-VEGF loaded PLGA microspheres for the treatment of avascular necrosis of the femoral head.

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Avascular necrosis of the femoral head (ANFH) is difficult to treat due to high pressure and hypoxia, and reduced levels of growth factors such as bone morphogenetic protein (BMP), and vascular endothelial growth factor (VEGF). We generated a novel calcium phosphate (CPC) composite scaffold, which

Hypoxia-induced overexpression of stanniocalcin-1 is associated with the metastasis of early stage clear cell renal cell carcinoma.

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BACKGROUND Although metastasis of clear cell renal cell carcinoma (ccRCC) is predominantly observed in late stage tumors, early stage metastasis of ccRCC can also be found with indefinite molecular mechanism, leading to inappropriate clinical decisions and poor prognosis. Stanniocalcin-1 (STC1) is a

Perfusion flow enhances osteogenic gene expression and the infiltration of osteoblasts and endothelial cells into three-dimensional calcium phosphate scaffolds.

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Maintaining cellular viability in vivo and in vitro is a critical issue in three-dimensional bone tissue engineering. While the use of osteoblast/endothelial cell cocultures on three-dimensional constructs has shown promise for increasing in vivo vascularization, in vitro maintenance of cellular

Local delivery of iron chelators reduces in vivo remodeling of a calcium phosphate bone graft substitute.

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Iron chelators are known activators of the Hypoxia Includible Factor-1α (HIF-1α) pathway, a critical cellular pathway involved in angiogenic responses to hypoxia. Local delivery of these chelators has shown promise in bone tissue engineering strategies by inducing angiogenesis and osteogenesis.

Hypoxia-mimicking Co doped TiO2 microporous coating on titanium with enhanced angiogenic and osteogenic activities.

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Advanced titanium (Ti) based bone implant with both angiogenesis and osteogenesis stimulating activities for enhanced clinical performance is stringently needed. In the present work, TiO2/calcium-phosphate (TCP) coatings on Ti doped with cobalt (Co) of various amounts (designated as C2-TCP, C7-TCP,

Enhancement of gene expression under hypoxic conditions using fragments of the human vascular endothelial growth factor and the erythropoietin genes.

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OBJECTIVE Selective gene expression in response to tumor hypoxia may provide new avenues, not only for radiotherapy and chemotherapy, but also for gene therapy. In this study, we have assessed the extent of hypoxia responsiveness of various DNA constructs by the luciferase assay to help design

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