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Post-transcription modulation of the blood-brain barrier GLUT1 glucose transporter by brain-derived factors

  • Ruben J. Boado
Conference paper

Abstract

Brain-derived peptides or factors in the brain-derived preparation Cerebrolysin® (CI, EBEWE, Austria) increase the expression of the blood-brain barrier (BBB) GLUT1 glucose transporter via mRNA stabilization. The post-transcriptional regulation of the BBB-GLUT1 gene is principally exerted by interaction of cis-regulatory elements located in the 3’- untranslated region of GLUT1 mRNA with cellular trans-acting factors (TAF). UV-cross linking and RNase T1 protection studies demonstrated the presence of 2 major GLUT1 RNA-TAF complexes named p88 (stabilizing) and the p44 (destabilizing). The p88 TAF was detected in cytosol of brain endothelial cultured cells (ECL) as a duplex of molecular weight of ~88kDa, which were defined A and B (high and low MW, respectively). CI markedly increased the abundance of the BBB-GLUT1 p88 TAF (complex B) in ECL cells, without changes in the levels of the p88 complex A. This was also confirmed by antisense oligomer displacement of the GLUT1 RNA-TAF complex formation. CI per se, did not bind to the GLUT1 mRNA, nor induced the expression of the destabilizing p44 TAF. Data presented here suggest that the increased stabilization of the GLUT1 transcript induced by CI is associated with augmented levels of the GLUT1 stabilizing p88 TAF.

Keywords

Glucose Transporter GLUT1 Glucose Transporter GLUT1 mRNA Large Neutral Amino Acid Transporter Arbitrary Densitometric Unit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 2000

Authors and Affiliations

  • Ruben J. Boado
    • 1
  1. 1.Department of MedicineUCLA School of MedicineLos AnglesUSA

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