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Related Experiment Videos

Nuclear KATP channels trigger nuclear Ca(2+) transients that modulate nuclear function.

Ivan Quesada1, Juan M Rovira, Franz Martin

  • 1Institute of Bioengineering, Miguel Hernández University, San Juan Campus, 03550 Alicante, Spain.

Proceedings of the National Academy of Sciences of the United States of America
|June 29, 2002
PubMed
Summary

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A novel ATP-sensitive potassium channel (K(ATP)) in pancreatic beta cell nuclei links glucose metabolism to nuclear function. Blocking this nuclear K(ATP) channel triggers calcium signals, influencing gene expression like c-myc.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Biology

Background:

  • Glucose regulates pancreatic beta cells, impacting insulin release and gene expression.
  • Mechanisms linking glucose to nuclear function in beta cells remain unclear.

Purpose of the Study:

  • To investigate the presence and function of ATP-sensitive potassium (K(ATP)) channels in pancreatic beta cell nuclei.
  • To elucidate the role of nuclear K(ATP) channels in glucose-mediated nuclear events.

Main Methods:

  • Isolated pancreatic beta cell nuclei were used to study K(ATP) channel activity.
  • Nuclear Ca(2+) transients and transcription factor phosphorylation were measured.
  • Fluorescence in situ hybridization was employed to assess gene expression (c-myc).

Related Experiment Videos

Main Results:

  • A functional K(ATP) channel, similar to the plasma membrane channel, was identified on the nuclear envelope of beta cells.
  • Blockade of nuclear K(ATP) channels with tolbutamide induced nuclear Ca(2+) transients.
  • These Ca(2+) signals correlated with the phosphorylation of cAMP response element binding protein and c-myc expression.

Conclusions:

  • A functional K(ATP) channel exists in the pancreatic beta cell nucleus.
  • This nuclear channel links glucose metabolism to nuclear Ca(2+) signaling and gene expression, including c-myc.