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Adenosine transporters

J A Thorn1, S M Jarvis

  • 1Research School of Biosciences, University of Kent, Canterbury, U.K.

General Pharmacology
|June 1, 1996
PubMed
Summary
This summary is machine-generated.

Mammalian nucleoside transporters are crucial for drug efficacy and distribution. Understanding facilitated-diffusion and sodium-dependent systems, including their molecular properties and genetic basis, is key for targeted therapies.

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Area of Science:

  • Biochemistry and Pharmacology
  • Molecular Biology
  • Cell Physiology

Background:

  • Nucleoside transport significantly impacts the pharmacokinetics and efficacy of adenosine and nucleoside analogue drugs (antiviral, anticancer).
  • Two primary types of adenosine transporters exist: facilitated-diffusion carriers and sodium-gradient-driven active transporters.
  • Facilitated-diffusion carriers are further classified as nitrobenzylthioinosine (NBMPR)-sensitive (es) or NBMPR-insensitive (ei).

Purpose of the Study:

  • To elucidate the characteristics and diversity of mammalian nucleoside transporters.
  • To understand the molecular and genetic basis of different nucleoside transport systems.
  • To inform the development of targeted nucleoside analogue therapies and transport inhibitors.

Main Methods:

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  • Characterization of transporter kinetics, substrate specificity, and inhibitor sensitivity (e.g., NBMPR, dipyridamole).
  • Purification and molecular weight determination of the es transporter.
  • Identification and gene cloning of sodium-dependent adenosine transport proteins (SNST1, cNT1).

Main Results:

  • The es transporter is a glycoprotein with broad substrate specificity, potentially existing as a dimer, with evidence of isoforms.
  • The ei transporter also exhibits broad substrate specificity but has lower affinity and is genetically distinct from es.
  • Four distinct sodium-dependent adenosine transport systems (N1-N4) have been identified, with SNST1 and cNT1 genes cloned.

Conclusions:

  • Mammalian nucleoside transport is complex, involving multiple facilitated-diffusion and sodium-dependent systems with varying molecular properties.
  • Cloning of adenosine transporter genes is crucial for a comprehensive understanding of nucleoside transport diversity.
  • Further research will enable better therapeutic targeting of nucleoside analogues and strategic use of transport inhibitors.