| 1. |
- Ilovich, Ohad, et al.
(författare)
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Rhodium-mediated [11C]Carbonylation : A library of N-phenyl-N′-{4-(4-quinolyloxy)-phenyl}-[11C]-urea derivatives as potential PET angiogenic probes
- 2009
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Ingår i: Journal of labelled compounds & radiopharmaceuticals. - : Wiley. - 0362-4803 .- 1099-1344. ; 52:5, s. 151-157
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Tidskriftsartikel (refereegranskat)abstract
- As part of our ongoing investigation into the imaging of angiogenic processes, a small library of eight vascular endothelial growth factor receptor-2 (VEGFR-2)/platelet-derived growth factor receptor beta dual inhibitors based on the N-phenyl-N'-4-(4-quinolyloxy)-phenyl-urea was labelled with C-11 (beta(+), t(1/2) = 20.4 min) in the urea carbonyl position via rhodium-mediated carbonylative cross-coupling of an aryl azide and different anilines. The decay-corrected radiochemical yields of the isolated products were in the range of 38-81% calculated from [C-11]carbon monoxide. Starting with 10.7+/-0.5 GBq of [C-11]carbon monoxide, 1-[4-(6,7-dimethoxy-quinolin-4-yloxy)-3-fluoro-phenyl]-3-(4-fluoro-phenyl)-[C-11]-urea (2.1 GBq) was isolated after total reaction time of 45 min with a specific activity of 92+/-4 GBq mu mol(-1).
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| 2. |
- Kepe, Vladimir, et al.
(författare)
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Amyloid-beta Positron Emission Tomography Imaging Probes : A Critical Review
- 2013
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Ingår i: Journal of Alzheimer's Disease. - 1387-2877 .- 1875-8908. ; 36:4, s. 613-631
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Forskningsöversikt (refereegranskat)abstract
- The rapidly rising prevalence and cost of Alzheimer's disease in recent decades has made the imaging of amyloid-beta deposits the focus of intense research. Several amyloid imaging probes with purported specificity for amyloid-beta plaques are currently at various stages of FDA approval. However, a number of factors appear to preclude these probes from clinical utilization. As the available "amyloid specific" positron emission tomography imaging probes have failed to demonstrate diagnostic value and have shown limited utility for monitoring therapeutic interventions in humans, a debate on their significance has emerged. The aim of this review is to identify and discuss critically the scientific issues contributing to the extensive inconsistencies reported in the literature on their purported in vivo amyloid specificity and potential utilization in patients.
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| 3. |
- Wolfhagen Sand, Fredrik, et al.
(författare)
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Growth-limiting role of endothelial cells in endoderm development
- 2011
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Ingår i: Developmental Biology. - : Academic Press. - 0012-1606 .- 1095-564X. ; 352:2, s. 267-277
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Tidskriftsartikel (refereegranskat)abstract
- Endoderm development is dependent on inductive signals from different structures in close vicinity, including the notochord, lateral plate mesoderm and endothelial cells. Recently, we demonstrated that a functional vascular system is necessary for proper pancreas development, and that sphingosine-1-phosphate (S1P) exhibits the traits of a blood vessel-derived molecule involved in early pancreas morphogenesis. To examine whether S1P(1)-signaling plays a more general role in endoderm development, S1P(1)-deficient mice were analyzed. S1P(1) ablation results in compromised growth of several foregut-derived organs, including the stomach, dorsal and ventral pancreas and liver. Within the developing pancreas the reduction in organ size was due to deficient proliferation of Pdx1(+) pancreatic progenitors, whereas endocrine cell differentiation was unaffected. Ablation of endothelial cells in vitro did not mimic the S1P(1) phenotype, instead, increased organ size and hyperbranching were observed. Consistent with a negative role for endothelial cells in endoderm organ expansion, excessive vasculature was discovered in S1P(1)-deficient embryos. Altogether, our results show that endothelial cell hyperplasia negatively influences organ development in several foregut-derived organs.
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