SciELO - Scientific Electronic Library Online

 
vol.89 issue6Heart Failure Treatment at Hospital Discharge. Do we Adhere to Guidelines? A Sub-analysis of the ARGEN-IC RegistryLong-term Durability of Mitral Valve Repair Surgery for Degenerative Regurgitation author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

  • Have no cited articlesCited by SciELO

Related links

  • Have no similar articlesSimilars in SciELO

Share


Revista argentina de cardiología

On-line version ISSN 1850-3748

Abstract

FRANCO-RIVEROS, VERENA B. et al. Myocardial Infarction in a Murine Model of Cardiac Sympathetic Hyperactivity. Rev. argent. cardiol. [online]. 2021, vol.89, n.6, pp.525-530.  Epub Dec 01, 2021. ISSN 1850-3748.  http://dx.doi.org/10.7775/rac.es.v89.i6.20455.

Background:

Dysautonomia is one of the main pathophysiological mechanisms that define the prognosis of ischemic heart disease and heart failure. The search for new treatment opportunities requires a deeper understanding of the cardiac effects of chronic sympathetic activation.

Objective:

The aim of this study was to analyze left ventricular infarct size and ventricular function in a transgenic mouse model with overexpression of the cardiac Gs-α protein, in the context of myocardial ischemia/reperfusion and chronic infarction.

Methods:

Transgenic mice (TG) overexpressing cardiac Gs-α and its wild-type variant (WT) were subjected to 30-minute regional myocardial ischemia followed by 2-hour reperfusion (IR) or non- reperfusion (I) with a 28-day follow-up period. Infarct size (IS) was quantified using 2,3,5-triphenyltetrazolium chloride and left ventricular function was evaluated by echocardiography and LV catheterization. Each experimental group was accompanied by a control group (WT/TG Sham-2hrs and WT/TG Sham-28d).

Results:

There were no significant differences in IS after IR between TG and WT mice (57.3 ± 3.5% vs. 59.2 ± 2.5%, respectively, p = NS). The heart rate in TG mice was higher throughout the experiment. With ischemia, a in ejection fraction (WT: Sham-28d: 82 ± 2.4% vs. I-28d: 44 ± 4% and TG: Sham-28d 89 ± 2% vs. I-28d 42 ± 3%; p <0.05) was observed together with a decrease in shortening fraction and left ventricular fractional area changes compared with baseline values and their respective control (Sham) groups. However, no differences were observed between the WT and TG groups.

Conclusions:

Cardiac Gs-α protein overexpression does not increase infarct size or modify left ventricular function in acute ischemia / reperfusion and chronic infarction compared with their respective controls.

Keywords : Dysautonomia; Ischemia/Reperfusion; Myocardial Infarction; GS-Alpha Protein.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )