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Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

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Screening Assay for Oxidative Stress in a Feline Astrocyte Cell Line, G355-5
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Oxidative stress contributes to methamphetamine-induced left ventricular dysfunction.

Kevin C Lord1, Sylvia K Shenouda, Elizabeth McIlwain

  • 1Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Science Center, 1901 Perdido Street, New Orleans, LA 70112, USA.

Cardiovascular Research
|February 9, 2010
PubMed
Summary
This summary is machine-generated.

Repeated methamphetamine binges cause heart damage by increasing oxidative stress, leading to structural changes and impaired function. This study links methamphetamine use to cardiac remodeling and dysfunction via reactive oxygen species.

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Area of Science:

  • Cardiology
  • Toxicology
  • Biochemistry

Background:

  • Methamphetamine (methamphetamine) abuse is a significant public health concern.
  • Chronic methamphetamine use is associated with cardiovascular complications.
  • The specific mechanisms underlying methamphetamine-induced cardiotoxicity require further elucidation.

Purpose of the Study:

  • To investigate the hypothesis that repeated, binge methamphetamine administration induces oxidative stress in the myocardium.
  • To determine if methamphetamine-induced oxidative stress leads to cardiac structural remodeling and impaired left ventricular function.
  • To explore the role of reactive oxygen species (ROS) in methamphetamine-induced cardiotoxicity.

Main Methods:

  • Rats were subjected to a regimen of four methamphetamine binges (3 mg/kg, intravenous) over 4 days, with 10-day drug-free intervals.
  • Left ventricular structure and function were assessed using echocardiography and Millar pressure-volume catheterization.
  • Cardiac tissue was analyzed for reactive oxygen species levels (dihydroethidium staining) and protein modifications (tyrosine nitration).

Main Results:

  • Methamphetamine binge administration resulted in eccentric left ventricular hypertrophy, impaired systolic function (reduced fractional shortening, ejection fraction), and diastolic dysfunction.
  • A significant 285% increase in reactive oxygen species (ROS) levels was observed in the left ventricles of methamphetamine-treated rats.
  • Tyrosine nitration of key contractile and mitochondrial proteins was evident following methamphetamine treatment.
  • The antioxidant tempol partially mitigated methamphetamine-induced left ventricular dilation and systolic dysfunction but did not prevent diastolic dysfunction or all markers of oxidative stress.

Conclusions:

  • Oxidative stress is a significant mediator of methamphetamine-induced eccentric left ventricular dilation and systolic dysfunction.
  • Targeting oxidative stress may offer a therapeutic strategy for mitigating methamphetamine-induced cardiac damage.
  • Further research is warranted to fully understand the complex mechanisms of methamphetamine cardiotoxicity and to develop effective interventions.