Acrylamide stimulates glutamine uptake in Fischer 344 rat astrocytes by a mechanism involving upregulation of the amino acid transport system N

Qi Wu, Marta Sidoryk, Lysette Mutkus, Magdalena Zielińska, Jan Albrecht, Michael Aschner

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

High demand of neoplastic tissues for glutamine (Gln) is met by its active transport across cell membranes. Chronic treatment with acrylamide in rodents is associated with an increased incidence of neoplasms, including astrocylomas. In this study, 24-h acrylamide treatment significantly increased the initial rate of L-[G-3H]glutamine uptake in astrocyte cultures derived from the acrylamide-sensitive Fischer 344 rat, and this effect could be fully inhibited by histidine, a model substrate for the amino acid transport system N. RT-PCR analysis revealed that acrylamide treatment caused a significant increase in the astrocytic expression of the mRNA coding for the major system N protein, SNAT3, which is specifically overexpressed in malignant gliomas in situ. The acrylamide-induced upregulation of astrocytic Gln transport via system N is likely to affect Gln homeostasis in these cells and may be causally related to the increased astrocytoma incidence observed in Fischer 344 rats.

Original languageEnglish (US)
Pages (from-to)435-443
Number of pages9
JournalAnnals of the New York Academy of Sciences
Volume1053
DOIs
StatePublished - Jan 1 2005
Externally publishedYes

Keywords

  • Acrylamide
  • Amino acid transport system N
  • Astrocyte
  • Fischer 344 rat
  • Glutamine (Gln)

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

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