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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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Regulatory volume increase and regulatory volume decrease responses in HL-1 atrial myocytes.

Veronica I Cacace1, Andres G Finkelsteyn, Laura M Tasso

  • 1Instituto de Investigaciones Cardiologicas "Profesor Alberto Taquini" (ININCA), Facultad de Medicina, Universidad de Buenos Aires; Buenos Aires, Argentina.

Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

HL-1 cardiomyocytes exhibit regulatory volume increase (RVI) and decrease (RVD) in response to osmotic stress. Bumetanide and DIDS inhibit RVI, suggesting involvement of specific transporters in cell volume regulation.

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Area of Science:

  • Cell biology
  • Cardiovascular physiology
  • Ion transport mechanisms

Background:

  • HL-1 cells are a widely used murine atrial cardiomyocyte cell line.
  • Cell volume regulation is crucial for cardiomyocyte function and survival.
  • Understanding volume regulatory mechanisms in HL-1 cells can provide insights into cardiac cell physiology.

Purpose of the Study:

  • To investigate the regulatory volume responses of HL-1 cardiomyocytes under hypotonic and hypertonic conditions.
  • To characterize the mechanisms underlying these volume regulatory responses.
  • To determine the effects of bumetanide and DIDS on HL-1 cell volume regulation.

Main Methods:

  • Utilized a light scattering system to measure transient volume changes in HL-1 cells.
  • Subjected HL-1 cells to osmotic challenges (hypotonic and hypertonic solutions).
  • Assessed the impact of bumetanide and DIDS on volume recovery rates and percentages.

Main Results:

  • HL-1 cells demonstrated both regulatory volume decrease (RVD) and regulatory volume increase (RVI) in response to osmotic stress.
  • RVD rate was 0.08 ± 0.04 intensity/min with 83.68 ± 5.73% volume recovery.
  • RVI rate was 0.09 ± 0.01 intensity/min with 92.3 ± 2.3% volume recovery; bumetanide and DIDS significantly inhibited RVI.

Conclusions:

  • HL-1 cells possess robust RVD and RVI capabilities.
  • Bumetanide-sensitive mechanisms, likely the Na(+)/K(+)/2Cl(-) cotransporter, are involved in RVI.
  • DIDS-sensitive mechanisms, likely the Cl(-)/bicarbonate exchanger, are implicated in RVI of HL-1 cells.