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Related Experiment Videos

Emigrated neutrophils regulate ventricular contractility via alpha4 integrin.

B Y Poon1, C A Ward, W R Giles

  • 1Department of Physiology and Biophysics and Immunology Research Group, University of Calgary, Calgary, Alberta, Canada.

Circulation Research
|June 12, 1999
PubMed
Summary
This summary is machine-generated.

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Alpha4 integrin, not CD18, significantly reduces neutrophil-induced cardiac myocyte dysfunction and contracture. Targeting alpha4 integrin effectively mitigates myocyte damage caused by emigrated neutrophils.

Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Cellular Physiology

Background:

  • Neutrophil adherence to cardiac myocytes involves CD18 and alpha4 integrin.
  • The role of these molecules in myocyte dysfunction remains unclear.

Purpose of the Study:

  • To investigate the role of CD18 and alpha4 integrin in neutrophil-induced myocyte dysfunction.
  • To assess the impact of blocking these integrins on myocyte contractility and function.

Main Methods:

  • Myocyte contractility was measured as an index of function.
  • Myocytes were exposed to circulating or emigrated neutrophils with or without anti-CD18 or anti-alpha4 antibodies.
  • Changes in cell shortening, contraction/relaxation rates, and contracture were analyzed.

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Main Results:

  • Emigrated neutrophils caused significant myocyte dysfunction, including reduced cell shortening and contracture.
  • Anti-alpha4 antibody, but not anti-CD18, significantly protected myocytes from dysfunction induced by emigrated neutrophils.
  • Both anti-CD18 and anti-alpha4 antibodies protected against later reductions in contraction and relaxation rates.

Conclusions:

  • Alpha4 integrin plays a critical role in mediating cardiac myocyte dysfunction induced by emigrated neutrophils.
  • Targeting alpha4 integrin is a promising strategy to mitigate neutrophil-induced cardiac injury.