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Related Experiment Videos

Bone marrow-derived cells contribute to contractile dysfunction in endotoxic shock.

Brian W Binck1, May F Tsen, Miguel Islas

  • 1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9063, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|October 2, 2004
PubMed
Summary

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Toll-like receptor 4 (TLR4) is required for LPS-induced myocardial contractile depression. Bone marrow-derived TLR4 is sufficient to confer sensitivity, but TLR4 in other tissues may also contribute to this response.

Area of Science:

  • Cardiology
  • Immunology
  • Sepsis Research

Background:

  • Infection can cause depressed heart contractility through complex mechanisms.
  • The role of Toll-like receptor 4 (TLR4) in this process is not fully understood.

Purpose of the Study:

  • To investigate the role of TLR4 in lipopolysaccharide (LPS)-induced myocardial contractile depression.
  • To determine the contribution of bone marrow-derived TLR4 to LPS-induced cardiac dysfunction.

Main Methods:

  • Comparison of contractile responses in wild-type (WT) and TLR4-deficient mouse hearts post-LPS challenge using Langendorff preparations.
  • Generation of TLR4 chimeric mice via adoptive transfer to assess bone marrow-derived TLR4 function.
  • Ex vivo assessment of cardiac function (left ventricular pressure, dP/dtmax, -dP/dtmax).

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Main Results:

  • TLR4-deficient hearts showed no significant contractile dysfunction after LPS administration, unlike WT hearts.
  • Engraftment of TLR4-deficient mice with WT bone marrow restored LPS sensitivity.
  • Inactivating bone marrow-derived TLR4 did not prevent endotoxin-induced contractile dysfunction, suggesting TLR4 in other tissues also plays a role.

Conclusions:

  • TLR4 is essential for LPS-induced myocardial contractile depression.
  • Bone marrow-derived TLR4 is sufficient to mediate LPS sensitivity.
  • Non-hematopoietic TLR4 also contributes to endotoxin-induced cardiac dysfunction.