Molecular Imaging and Biology

, Volume 13, Issue 6, pp 1290–1300 | Cite as

Impact of Cell-Proliferation-Associated Gene Expression on 2-Deoxy-2-[18F]fluoro-d-Glucose (FDG) Kinetics as Measured by Dynamic Positron Emission Tomography (dPET) in Colorectal Tumors

  • Ludwig G. Strauss
  • Dirk Koczan
  • Sven Klippel
  • Leyun Pan
  • Caixia Cheng
  • Uwe Haberkorn
  • Stefan Willis
  • Antonia Dimitrakopoulou-Strauss
Research Article

Abstract

Introduction

Glucose transporters and hexokinases determine the kinetics of 2-deoxy-2-[18F]fluoro-d-glucose (FDG). However, the genes controlling these proteins are not independent and may be modulated from other biological processes, e.g., like angiogenesis and proliferation. The impact of cell-proliferation-related genes on the FDG kinetics was assessed in colorectal tumors in this study.

Methods

Patients with primary colorectal tumors (n = 25) were examined with positron emission tomography and FDG within 2 days prior to surgery. Tissue specimens were obtained from the colorectal tumor and the normal colon by surgery and gene expression was assessed using gene arrays.

Results

Overall, an increase of the expression of proliferation associated genes was observed by a factor of 2–5.3 for the colorectal tumors as compared with the normal colon. Correlation analysis revealed an impact of cdk2 on K1, thus directing to a modulation of the FDG uptake into the cells. The correlations were generally higher for the FDG influx as compared with the standardized uptake value (SUV). The influx was mainly correlated with proliferation inhibiting genes (cyclin G2, cdk inhibitor 1 C, cdk inhibitor 2B). It was possible to predict the expression of cyclin D2 using a multiple linear regression function and the parameters of the FDG kinetics with r = 0.67. Using a group based analysis it was possible to demonstrate, that tumors with an SUV >12 are associated with a high expression of cyclin D2 in the colorectal tumors. If the gene expression data for cyclin D1, cyclin G2, cdk2, cdk6 and cdk inhibtor 2B were used, the overall FDG uptake as measured by the SUV could be predicted with r = 0.75.

Conclusions

The results suggest that the FDG kinetics is modulated by proliferation associated genes. Especially K1, the parameter for the FDG transport into the cells, is modulated by cdk2. Tumors with a SUV exceeding 12 have usually a higher expression of cyclin D2. The parameters of the FDG kinetics can be used to predict the expression of proliferation associated genes individually.

Key words

PET FDG Cell cycle Proliferation Gene expression Gene array 

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Copyright information

© Academy of Molecular Imaging and Society for Molecular Imaging 2010

Authors and Affiliations

  • Ludwig G. Strauss
    • 1
  • Dirk Koczan
    • 2
  • Sven Klippel
    • 3
  • Leyun Pan
    • 1
  • Caixia Cheng
    • 1
  • Uwe Haberkorn
    • 1
    • 4
  • Stefan Willis
    • 3
  • Antonia Dimitrakopoulou-Strauss
    • 1
  1. 1.Clinical Cooperation Unit Nuclear MedicineGerman Cancer Research CenterHeidelbergGermany
  2. 2.Institute of ImmunologyUniversity RostockRostockGermany
  3. 3.Surgical Clinic A, Klinikum LudwigshafenLudwigshafenGermany
  4. 4.Department of Nuclear MedicineRuprecht-Karls-UniversityHeidelbergGermany

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