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Mechanisms related to [F-18]fluorodeoxyglucose uptake of human colon cancers transplanted in nude mice

Title
Mechanisms related to [F-18]fluorodeoxyglucose uptake of human colon cancers transplanted in nude mice
Authors
Chung, JKLee, YJKim, CChoi, SRKim, MLee, KJeong, JMLee, DSJang, JJLee, MC
Ewha Authors
이경림
SCOPUS Author ID
이경림scopus
Issue Date
1999
Journal Title
JOURNAL OF NUCLEAR MEDICINE
ISSN
0161-5505JCR Link
Citation
vol. 40, no. 2, pp. 339 - 346
Keywords
colon cancer[F-18]fluorodeoxyglucoseglucose transporterglucose transporter messenger ribonucleic acidhexokinase
Publisher
SOC NUCLEAR MEDICINE INC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
[F-18]Fluorodeoxyglucose ([F-18]FDG), a glucose analogue, has been widely used for tumor imaging. To investigate the mechanisms related to [F-18]FDG uptake by tumors, an experiment involving nude mice was performed. Methods: Human colon cancer cell lines SNU-C2A, SNU-C4 and SNU-C5 were transplanted to nude mice. Using immunohistochemical staining and Western blot, the expression of glucose transporter (Glut) isoforms (Glut-1 similar to 5) in xenografted tumors was analyzed. For the analysis of messenger ribonucleic acid (mRNA) expression, reverse-transcription polymerase chain reaction and Northern blot were used and the enzyme activity of hexokinase in cancer tissues was measured by continuous spectrophotometric rate determination. Results: [F-18]FDG uptake in SNU-C4 and SNU-C5 cells was higher than in normal colon cells. Among these cells and xenografted tumors, SNU-C5 showed the highest level of [F-18]FDG uptake, followed by SNU-C4 and SNU-C2A. An immunostaining experiment showed intense staining of Glut-1 in SNU-C5 tumors but somewhat faint staining in SNU-C4. SNU-C5 tumors also showed positive staining with Glut-3, although this was not the case with SNU-C2A and SNU-C4. Western blot analysis showed the expression of Glut-1 and Glut-3 in all tumors. Experiments involving Northern blot analysis and reverse-transcription polymerase chain reaction confirmed the overexpression of Glut-1 mRNA in all tumors, with the highest level in SNU-C5. The level of Glut-3 mRNA was also elevated in SNU-C5 tumors but not in SNU-C2A and SNU-C4. The enzyme activity of hexokinase did not vary among different tumors. Conclusion: Gluts, especially Glut-1, are responsible for [F-18]FDG uptake in a nude mouse model of colon cancer rather than hexokinase activity. Increased numbers of glucose transporters at the plasma membrane of cancer cells is attributed to an increased level of transcripts of glucose transporter genes and may be a cause of increased [F-18]FDG uptake, at least in colon cancer tumors.
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