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The rat norepinephrine transporter: molecular cloning from PC12 cells and functional expression
M Brüss1, P Pörzgen, L J Bryan-Lluka
1Institute of Pharmacology and Toxicology, University of Bonn, Germany.
Brain Research. Molecular Brain Research
|March 12, 1998
Summary
Researchers cloned the rat norepinephrine transporter (rNET) cDNA, revealing a protein crucial for neurotransmitter uptake. This discovery aids in understanding norepinephrine transport mechanisms and related neurological functions.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- The norepinephrine transporter (NET) plays a critical role in regulating neurotransmitter levels in the brain.
- Understanding the molecular characteristics of NET is essential for developing targeted therapies for neurological and psychiatric disorders.
Purpose of the Study:
- To clone and characterize the complementary DNA (cDNA) encoding the rat norepinephrine transporter (rNET) from the PC12 pheochromocytoma cell line.
- To investigate the functional properties of the cloned rNET in a heterologous expression system.
Main Methods:
- Complementary DNA (cDNA) was synthesized using reverse transcription-polymerase chain reaction (RT-PCR).
- The rNET cDNA was expressed in HEK293 cells for functional analysis.
- Uptake assays were performed using [3H]norepinephrine in the presence of various ions and inhibitors.
Main Results:
- The cloned rNET cDNA encodes a 617-amino acid integral membrane protein with twelve putative transmembrane domains.
- Sequence homology analysis revealed significant similarity to human and bovine NET, and less to rat dopamine transporter (rDAT).
- Heterologous expression confirmed that rNET-mediated [3H]norepinephrine uptake is sodium- and chloride-dependent and inhibited by desipramine and nisoxetine.
Conclusions:
- The successful cloning and characterization of rNET provide a valuable tool for studying norepinephrine transport.
- The findings contribute to the understanding of the structure-function relationship of neurotransmitter transporters.
- This research expands the repertoire of cloned sodium- and chloride-dependent neurotransmitter transporters.