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Related Experiment Videos

Mechanisms of [Ca2+]i transient decrease in cardiomyopathy of db/db type 2 diabetic mice.

Laetitia Pereira1, Jan Matthes, Iris Schuster

  • 1Institut National de la Santé et de la Recherche Médicale U-637, University of Montpellier 1, France.

Diabetes
|March 1, 2006
PubMed
Summary
This summary is machine-generated.

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Diabetic cardiomyopathy in obese mice involves reduced intracellular calcium transients and fewer calcium sparks. This is due to decreased sarcoplasmic reticulum calcium load and fewer functional calcium channels, impairing cardiac function.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Physiology

Background:

  • Cardiovascular disease is a major cause of death in diabetics.
  • Diabetic cardiomyopathy mechanisms are not fully understood.

Purpose of the Study:

  • Investigate molecular mechanisms of diabetic cardiomyopathy.
  • Analyze calcium handling and excitation-contraction coupling in obese diabetic mice.

Main Methods:

  • Used db/db obese type 2 diabetic mice and control littermates.
  • Performed echocardiography, two-photon microscopy, confocal microscopy, [3H]ryanodine binding assays, and Western blots.
  • Analyzed intracellular calcium concentration ([Ca2+]i) transients, calcium sparks, sarcoplasmic reticulum calcium load, ryanodine receptor (RyR) expression, and calcium current (I(Ca)).

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Main Results:

  • Db/db mice exhibited systolic dysfunction.
  • Intracellular calcium transients and calcium sparks were decreased in db/db cardiomyocytes.
  • Sarcoplasmic reticulum calcium load and RyR expression were reduced.
  • Calcium efflux via the Na+/Ca2+ exchanger was increased.
  • Macroscopic I(Ca) was reduced, indicating fewer functional calcium channels.

Conclusions:

  • Db/db mice display depressed cardiac function partly due to reduced cardiac membrane permeability to calcium.
  • Decreased calcium influx via I(Ca) leads to reduced calcium release through RyRs, contributing to cardiomyopathy.