Manganese disrupts astrocyte glutamine transporter expression and function

Marta Sidoryk-W̧grzynowicz, Eunsook Lee, Jan Albrecht, Michael Aschner

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Glutamine (Gln) plays an important role in brain energy metabolism and as a precursor for the synthesis of neurotransmitter glutamate and GABA. Previous studies have shown that astrocytic Gln transport is impaired following manganese (Mn) exposure. The present studies were performed to identify the transport routes and the respective Gln transporters contributing to the impairment. Rat neonatal cortical primary astrocytes treated with Mn displayed a significant decrease in Gln uptake mediated by the principle Gln transporting systems, N and ASC. Moreover, systems N, ASC and L were less efficient in Gln export after Mn treatment. Mn treatment caused a significant reduction of both in mRNA expression and protein levels of SNAT3 (system N), SNAT2 (system A) and LAT2 (system L), and lowered the protein but not mRNA expression of ASCT2 (system ASC). Mn exposure did not affect the expression of the less abundant systems N transporter SNAT5 and the system L transporter LAT1, at either the mRNA or protein level. Hence, Mn-induced decrease of inward and outward Gln transport can be largely ascribed to the loss of the specific Gln transporters. Consequently, deregulation of glutamate homeostasis and its diminished availability to neurons may lead to impairment in glutamatergic neurotransmission, a phenomenon characteristic of Mn-induced neurotoxicity.

Original languageEnglish (US)
Pages (from-to)822-830
Number of pages9
JournalJournal of Neurochemistry
Volume110
Issue number3
DOIs
StatePublished - Aug 2009
Externally publishedYes

Fingerprint

Manganese
Glutamine
Astrocytes
Messenger RNA
Glutamic Acid
Amino Acid Transport System A
Proteins
Deregulation
Synaptic Transmission
gamma-Aminobutyric Acid
Energy Metabolism
Neurons
Neurotransmitter Agents
Rats
Brain
Homeostasis
Availability

Keywords

  • Amino acid transporters
  • Glutamine
  • Manganese
  • Neurotoxicity

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

Cite this

Manganese disrupts astrocyte glutamine transporter expression and function. / Sidoryk-W̧grzynowicz, Marta; Lee, Eunsook; Albrecht, Jan; Aschner, Michael.

In: Journal of Neurochemistry, Vol. 110, No. 3, 08.2009, p. 822-830.

Research output: Contribution to journalArticle

Sidoryk-W̧grzynowicz, Marta ; Lee, Eunsook ; Albrecht, Jan ; Aschner, Michael. / Manganese disrupts astrocyte glutamine transporter expression and function. In: Journal of Neurochemistry. 2009 ; Vol. 110, No. 3. pp. 822-830.
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