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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

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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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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Related Experiment Video

Updated: Oct 22, 2025

A Model of Cardiac Remodeling Through Constriction of the Abdominal Aorta in Rats
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Cardiac dysfunction in spontaneously hypertensive old rats is associated with a significant decrease of SUR2

Ruslan B Strutynskyi1, Serhii V Goncharov1, Lesya V Tumanovska1

  • 1Department of General and Molecular Pathophysiology, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Address: 4, Bogomoletz str., Kyiv, 01024, Ukraine.

Molecular and Cellular Biochemistry
|August 29, 2021
PubMed
Summary
This summary is machine-generated.

Aging and hypertension alter ATP-sensitive potassium (KATP) channels. Reduced SUR2 expression in aged hypertensive rats correlates with heart failure, suggesting SUR2 may protect against cardiac remodeling.

Keywords:
AgingExpression of KATP channelsHypertensionMyocardial remodelingSUR2

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Geroscience

Background:

  • ATP-sensitive potassium (KATP) channels are crucial in regulating cardiac function and pathological remodeling.
  • Aging and sustained hypertension significantly impact cardiovascular health and cardiac structure.
  • Understanding KATP channel subunit expression changes is vital for identifying mechanisms of heart failure.

Purpose of the Study:

  • To investigate the association between KATP channel subunit expression (Kir6.1, Kir6.2, SUR1, SUR2) and cardiac remodeling in aging spontaneously hypertensive rats (SHR) and Wistar rats.
  • To determine how aging and hypertension influence the expression of KATP channel subunits.
  • To explore the role of KATP channel subunits in the decompensation of heart function during aging under hypertensive conditions.

Main Methods:

  • Utilized spontaneously hypertensive rats (SHR) and Wistar rats of young and old age groups.
  • Quantified mRNA expression levels of KATP channel subunits (Kir6.1, Kir6.2, SUR1, SUR2) using reverse transcription and quantitative PCR.
  • Analyzed correlations between KATP channel subunit expression and cardiac functional/structural changes.

Main Results:

  • Young SHR rats exhibited significantly lower Kir6.1 mRNA expression compared to young Wistar rats.
  • Old SHR rats showed significantly higher mRNA expression of Kir6.1 and Kir6.2 compared to young SHR rats.
  • SUR2 mRNA expression was significantly reduced in both old Wistar and old SHR rats compared to their young counterparts, with a particularly drastic reduction in old SHR rats. SUR1 expression remained unchanged.

Conclusions:

  • Significant cardiac remodeling and functional impairment in aged SHR rats are linked to a marked decrease in SUR2 expression, potentially contributing to heart failure decompensation.
  • Altered expression of KATP channel subunits, especially SUR2, plays a critical role in age-related cardiovascular changes under hypertensive stress.
  • Upregulation of SUR2 may serve as a protective mechanism against pathological myocardial remodeling and heart failure.