J O Dejordy

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M2R melanoma tumors in male C57 black mice were used to correlate magnetic resonance (MR) images with the corresponding histologic slices and to determine if analysis of the achievable correlation can provide a basis for predicting gross histologic features with MR imaging alone. The MR imaging sections obtained at 4.7 T were each 680 microns thick, with an(More)
In vitro ESR studies of doxorubicin and 4'-deoxydoxorubicin have been conducted using the spin traps PBN and DMPO. Solutions prepared in the presence of atmospheric oxygen at pH = 12 exhibited a typical semiquinone signal preceded by a short-lived signal attributed to perhydroxyl radical, HO2. At physiological pH the perhydroxyl signal was observed in the(More)
Melanocortins appear to be involved as regulators in an ever growing number of physiological processes in cells and tissues of diverse functions. While such trends are apparent also in the case of other peptide hormones, it appears that melanocortin receptors can be regarded as unique among G-protein-linked receptors due to their special need for(More)
A major part of the present understanding of the molecular basis of signal transduction has been gained from in vitro studies using classical biochemical methods. In this study, we used 31P NMR spectroscopy to investigate the response of live M2R mouse melanoma cells to stimulation by melanocyte-stimulating hormone (MSH; melanotropin). In the presence of(More)
Using living cells or tissues 31P nuclear magnetic resonance (NMR) spectroscopy can uniquely provide a real-time panoramic view of the major intracellular phosphate metabolites and continuously monitor changes in their concentrations. Hormone regulated cascades in many instances influence intracellular phosphate metabolism at various levels. Regulation of(More)
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