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Functional expression of SGLTs in rat brain.

Amy S Yu1, Bruce A Hirayama, Gerald Timbol

  • 1Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, Universityof California Los Angeles, California 90095-1751, USA.

American Journal of Physiology. Cell Physiology
|September 10, 2010
PubMed
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This study reveals that sodium-coupled glucose transporters (SGLTs) are active in specific brain regions. New tracers show SGLTs play a role in brain glucose uptake, offering new imaging possibilities.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Radiochemistry

Background:

  • Current brain glucose metabolism studies primarily rely on 2-deoxy-2-[F-18]fluoro-D-glucose (2-FDG) tracers.
  • 2-FDG is specific to facilitated-glucose transporters (GLUTs) and does not reflect the activity of sodium-coupled glucose transporters (SGLTs).
  • This overlooks the functional contribution of SGLTs to brain glucose uptake.

Purpose of the Study:

  • To investigate and visualize glucose uptake mediated by SGLTs in the brain.
  • To develop and validate novel radiotracers for imaging SGLT activity.
  • To establish the physiological relevance of SGLTs in specific brain regions.

Main Methods:

  • Synthesis of two novel high-affinity PET tracers: Me-4FDG (SGLT-specific) and 4-FDG (SGLT and GLUT transport).

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  • In vitro autoradiography using Me-4FDG and 4-FDG on brain slices.
  • Immunohistochemical analysis to correlate tracer uptake with SGLT protein distribution.
  • Ex vivo autoradiography with 4-FDG to assess in vivo SGLT activity.

    • Main Results:

    • In vitro autoradiography demonstrated distinct uptake patterns for Me-4FDG and 4-FDG, consistent with SGLT distribution.
    • Immunohistochemistry confirmed that tracer uptake colocalized with SGLT protein expression.
    • Ex vivo studies showed functional SGLT activity in vivo within specific brain areas.
    • Identified hippocampus, amygdala, hypothalamus, and cerebral cortices as regions with significant SGLT-mediated glucose uptake.

    Conclusions:

    • Sodium-coupled glucose transporters (SGLTs) are physiologically active in specific brain regions.
    • Novel tracers like 4-FDG enable functional imaging of SGLT activity across the blood-brain barrier (BBB).
    • This opens new avenues for assessing SGLT regulation in neurological health and disease using PET imaging.