Cellular distribution of glut-1 and glut-5 in benign and malignant human prostate tissue

Karin Reinicke, Paula Sotomayor, Pedro Cisterna, Carolina Delgado, Francisco Nualart, Alejandro Godoy

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

Abstract

Over-expression of hexose transporters (Gluts), specifically Glut-1, is a common event in human malignancies. In prostate cancer (CaP), however, expression of Gluts has been characterized poorly. In this study, expression and distribution of Glut-1 and Glut-5 proteins were characterized using immunohistochemistry in 76 specimens of benign prostate, 10 specimens of high-grade intraepithelial neoplasia (HGPIN), and 28 specimens of CaP. In addition, mRNA expression of Glut-2, Glut-7, Glut-9, and Glut-11 was analyzed in a set of five specimens of benign prostate and CaP. In benign prostate, Glut-1 localized to the basal cells and to the basolateral membrane of secretory/luminal epithelial cells. Glut-5, however, localized to the apical membrane of secretory/luminal epithelial cells. In HGPIN, Glut-1 was immunohistochemically undetectable. Glut-5, however, localized to the apical membrane of the neoplastic epithelial cells. In CaP, Glut-1 and Glut-5, were immunohistochemically undetectable. However, over-expression of GLUT1 was observed in some specimens of highly proliferative intraductal CaP. Glut-7, Glut-9, and Glut-11 mRNAs were detected in benign prostate and CaP, however, only Glut-11 mRNA was consistently up-regulated in CaP compared to benign prostate. Low levels of expression of Glut-1 protein in the majority of CaP could explain, at least in part, the limited clinical applicability of positron emission tomography using 2-[18F]-fluoro-2-deoxy-D-glucose for imaging CaP. Moreover, expression of Glut-5 in HGPIN suggested that fructose could be utilized as potential metabolic substrate in HGPIN. Understanding the molecular mechanisms involved in regulation/dysregulation of Gluts in CaP could provide insight in the understanding of hexose metabolism in CaP.

Original languageEnglish
Pages (from-to)553-562
Number of pages10
JournalJournal of Cellular Biochemistry
Volume113
Issue number2
DOIs
Publication statusPublished - Feb 2012

Keywords

  • Glucose
  • Glucose transporter
  • Glut-1
  • Glut-5
  • Prostate
  • Prostate cancer

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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