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Molecular characterization of human SUR2-containing K(ATP) channels
R Davis-Taber1, W Choi, J Feng
1Neurological and Urological Diseases Research, Dept. 47C, APgA, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA.
Gene
|October 31, 2000
Summary
Human sulfonylurea receptor-2 (SUR2) splice variants show distinct tissue distribution. These SUR2 variants, including SUR2A and SUR2B, form functional K(ATP) channels with Kir 6.2, impacting cellular function.
Area of Science:
- Molecular Biology
- Cardiovascular Physiology
- Neuroscience
Background:
- K(ATP) channels are crucial for cellular energy homeostasis.
- Sulfonylurea receptor-2 (SUR2) is a key subunit of K(ATP) channels.
- SUR2 exhibits splice variants with potentially different functions.
Purpose of the Study:
- To investigate the distribution of human SUR2 splice variants.
- To determine the functional capacity of SUR2 variants in forming K(ATP) channels.
Main Methods:
- Reverse transcriptase-polymerase chain reaction (RT-PCR) for mRNA detection.
- Real-time Taqman PCR for quantitative analysis.
- Transient expression in HEK 293 cells and electrophysiological recordings.
Main Results:
- SUR2B mRNA found in brain, skeletal, cardiac, and smooth muscle.
- SUR2A mRNA restricted to cardiac and skeletal muscle.
- A novel SUR2 variant lacking exon 17 was identified.
- SUR2 exon 17+ is the predominant variant across tissues.
- All SUR2 variants formed functional K(ATP) channels with Kir 6.2.
Conclusions:
- Distinct expression patterns of SUR2 splice variants were observed.
- SUR2 splice variants contribute to functional K(ATP) channel diversity.
- These findings have implications for understanding K(ATP) channel roles in various tissues.