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Related Concept Videos

Heart Failure Drugs: Inotropic Agents01:26

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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Transducer Mechanism: Enzyme-Linked Receptors01:27

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Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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Updated: Apr 23, 2026

Enhancing the Engraftment of Human Induced Pluripotent Stem Cell-derived Cardiomyocytes via a Transient Inhibition of Rho Kinase Activity
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Hexokinases and cardioprotection.

Guillaume Calmettes1, Bernard Ribalet1, Scott John1

  • 1UCLA Cardiovascular Research Laboratory, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA; Department of Medicine (Cardiology), David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA; Department of Physiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.

Journal of Molecular and Cellular Cardiology
|September 30, 2014
PubMed
Summary
This summary is machine-generated.

Hexokinases (HKs) are key enzymes in glucose metabolism that protect the heart from ischemia/reperfusion (I/R) injury. Understanding HKs

Keywords:
CardioprotectionHexokinaseIschemia/reperfusionPostconditioningPreconditioning

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Area of Science:

  • Mitochondrial biology
  • Cardiovascular disease
  • Metabolic pathways

Background:

  • Hexokinases (HKs) are crucial enzymes initiating glucose metabolism.
  • HKs regulate cellular energy production, antioxidant defense, and cell death.
  • Their interaction with voltage-dependent anion channels (VDAC) influences mitochondrial permeability transition pore (mPTP) opening.

Purpose of the Study:

  • To review the role of HKs in protecting the heart against ischemia/reperfusion (I/R) injury.
  • To explore how HK isoforms and their localization affect cardiac function during I/R.
  • To discuss therapeutic strategies targeting HKs for cardioprotection.

Main Methods:

  • Review of existing literature on hexokinases and I/R injury.
  • Analysis of HK isoform properties and subcellular localization.
  • Examination of molecular mechanisms linking HKs to mPTP and cellular injury.
  • Correlation of metabolic profiles with I/R susceptibility and cardioprotection.

Main Results:

  • HKs modulate glucose metabolism and energy production during I/R.
  • HKs influence mPTP opening, a key factor in I/R-induced cellular damage.
  • Metabolic and HK profiles vary across different cell types and heart conditions, impacting I/R injury susceptibility.

Conclusions:

  • HKs play a significant role in cardiac protection against I/R injury.
  • Understanding HK function and localization is vital for developing novel cardioprotective therapies.
  • Targeting HKs offers potential therapeutic strategies to mitigate heart damage during I/R events.