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Leukemic Red Marrow Changes Assessed by Proton Magnetic Resonance Spectroscopy Before and Following Chemotherapy
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Dong Gun Shin, Hoon Chung, Jong Ki Kim, Young Hwan Rhee
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J Korean Cancer Assoc. 1998;30(5):1014-1020.
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 Abstract
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- PURPOSE
The purpose of this study was to investigate the possibilities for serial in vivo localized proton magnetic resonance spectroscopy (MRS) examination of bone marrow in patients with acute le,ukemia.
MATERIALS AND METHODS
Selective measurements of the relaxation times Tl and T2 for the water and fat resonance in the bone marrow spectra were performed (1.5 Tesla whole body magnetic resonance scanner). Six patients with acute leukemia were examined at diagnosis. Follow-up examinations of four patients with acute leukemia in complete remission were also examined. Six normal control subjects were examined with identical methods for comparison.
RESULTS
Significant differences could be detected in the spectral patterns from lumbar spine in patients with leukemia at diagnosis compared to healthy normal controls.
The relative water content was increased in leukemic patients compared to normal subjects, which indicate an increase in the amount of hemopoietic tissue and a corresponding decrease in marrow fat content. A significant correlation was found between cellularity assessments derived from conventional bone marrow core biopsies and relative water content of proton MRS data. The Tl relaxation time of the water resonance in leukemic patients were significantly prolonged at diagnosis compared to normal controls. After chemotherapeutic induction of remission, the spectra from the bone marrow of lumbar spine resembled normal subjects.
CONCLUSIONS
This method provide the possibility for serial measurements of bone marrow in patients with leukemia, and may provide information from regions inaccessible to bone marrow biopsy. This therefore appears to be a promising application of proton MRS that can be performed on a routine basis in a clinical setting.
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Effect of Exogenous Exon 1 and Upstream Sequences on c-myc Expression in NIH3T3 Cells
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Young Hwan Rhee, Tai Ju Hwang
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J Korean Cancer Assoc. 1990;22(2):229-239.
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Abstract
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- Several mechanisms regarding activation of c-myc have been proposed. However, the molecular mechanism by which c-myc deregulation can occur remains obscure and no supparting evidence for a clearly defined regulation of c-myc expression has been provided. This research was designed to investigate the possible effect of exon 1 and its upstream sequences on c-myc expression. The transcriptional activities of exogenous plasmids and endogenous c-myc were studied for their expression after NIH3T3 cells were transiently transfected with plasmids containing exon 1 and upstream sequences of mouse c-myc that are putativelv regulatory sequences. The results of this research rule out a possible role of putatively regulatory sequences for transacting elements, an activator and a repressor, because the expressions of c-myc were not affected by the exogenous elements of exon 1 or upstream sequence in NIH3T3 fibroblast cells.
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KCA
