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Voltage and Calcium Dual Channel Optical Mapping of Cultured HL-1 Atrial Myocyte Monolayer
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Store-operated calcium entry is present in HL-1 cardiomyocytes and contributes to resting calcium

Chad D Touchberry1, Chris J Elmore, Tien M Nguyen

  • 1School of Medicine, Muscle Biology Research Group, University of Missouri-Kansas City, Kansas City, MO 64108, USA.

Biochemical and Biophysical Research Communications
|November 15, 2011
PubMed

Insights

HL-1 cells, a unique cardiac cell line, effectively model store-operated calcium entry (SOCE). This model aids research into SOCE

Area of Science:

  • Cardiology
  • Cell Biology
  • Calcium Signaling

Background:

  • Store-operated Ca(2+) entry (SOCE) is crucial in cardiac function and disease, but difficult to study in primary cardiomyocytes.
  • HL-1 cells offer a stable, immortalized in vitro model for cardiomyocyte research.

Purpose of the Study:

  • To investigate the role and mechanisms of SOCE in HL-1 cardiac cells.
  • To establish HL-1 cells as a reliable model for studying SOCE in the heart.

Main Methods:

  • Assessed expression of SOCE components (STIM1, Orai1) in HL-1 cells.
  • Measured intracellular Ca(2+) changes during SOCE using inhibitors and Orai1 knockdown (RNAi).
  • Examined SOCE coupling with sarcoplasmic reticulum Ca(2+) release and other ion channels.

Main Results:

  • HL-1 cells express STIM1 and Orai1, key for SOCE.
  • SOCE in HL-1 cells is linked to sarcoplasmic reticulum Ca(2+) release and unaffected by other channel inhibitors.
  • Orai1 knockdown reduced baseline Ca(2+) and attenuated responses to thapsigargin and caffeine.

Conclusions:

  • HL-1 cells are a valuable in vitro model for studying SOCE in cardiomyocytes.
  • SOCE may influence Ca(2+) homeostasis in unstressed cardiomyocytes.
  • This model can advance research on SOCE's role in cardiac pathology and drug development.

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