We sought to determine whether brain death-induced catecholamine release preconditions the heart, and if not, whether it precludes further protection by repetitive ischemia or isoflurane. Anesthetized rabbits underwent 30 min of coronary occlusion and 4 h of reperfusion. The effect on infarct size of either no intervention (controls), ischemic preconditioning (IPC), or isoflurane inhalation (Iso) was evaluated with or without previous brain death (BD) induced by subdural balloon inflation. Plasma catecholamine levels were measured at several time points. Although it dramatically increase plasma catecholamine levels, BD failed to reduce infarct size that averaged 0.49 +/- 0.34 without BD versus 0.45 +/- 0.27 g with BD. IPC and Iso, alone as well as after BD, significantly reduced infarct size that averaged 0.11 +/- 0.04, 0.21 +/- 0.15, 0.10 +/- 0.09, and 0.22 +/- 0.10 g in IPC, Iso, BD + IPC, and BD + Iso groups, respectively (means +/- SD, P < 0.05 vs. controls). BD-induced catecholamines "storm" does not precondition the rabbit heart that however retains the ability to be protected by repetition of brief ischemia or isoflurane inhalation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1152/ajpheart.00361.2002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Surface-enhanced Raman spectroscopy for the characterization of filtrate portions of blood serum samples of myocardial infarction patients using 30 kDa centrifugal filter devices.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Department of Chemistry, Institut - Courtois, Quebec Center for Advanced Materials (QCAM), and Regroupement Québécois sur les Matériaux de Pointe (RQMP), Université de Montréal, Montréal, Quebec H3C 3J7, Canada.
Myocardial infarction (MI) is the leading cause of death and disability worldwide. It occurs when a thrombus forms after an atherosclerotic plaque bursts, obstructing blood flow to the heart. Prompt and accurate diagnosis is crucial for improving patient survival.
View Article and Find Full Text PDFHSP90 Family Members, Their Regulators and Ischemic Stroke Risk: A Comprehensive Molecular-Genetics and Bioinformatics Analysis.
Front Biosci (Schol Ed)
December 2024
Laboratory of Genomic Research, Research Institute for Genetic and Molecular Epidemiology, Kursk State Medical University, 305041 Kursk, Russia.
Background: Disruptions in proteostasis are recognized as key drivers in cerebro- and cardiovascular disease progression. Heat shock proteins (HSPs), essential for maintaining protein stability and cellular homeostasis, are pivotal in neuroperotection. Consequently, deepening the understanding the role of HSPs in ischemic stroke (IS) risk is crucial for identifying novel therapeutic targets and advancing neuroprotective strategies.
View Article and Find Full Text PDFPolymorphism in Genes Encoding HSP40 Family Proteins is Associated with Ischemic Stroke Risk and Brain Infarct Size: A Pilot Study.
J Integr Neurosci
December 2024
Laboratory of Genomic Research, Research Institute for Genetic and Molecular Epidemiology, Kursk State Medical University, 305041 Kursk, Russia.
Background: Heat shock proteins (HSPs) play a critical role in the molecular mechanisms of ischemic stroke (IS). A possible role for HSP40 family proteins in atherosclerosis progression has already been revealed; however, to date, molecular genetic studies on the involvement of genes encoding proteins of the HSP40 family in IS have not yet been carried out.
Aim: We sought to determine whether nine single nucleotide polymorphisms (SNPs) in genes encoding HSP40 family proteins (, , , , and ) are associated with the risk and clinical features of IS.
A Unique Case of Internuclear Ophthalmoplegia and Artery of Percheron Infarct.
Cureus
November 2024
Neurology, Dalhousie University, Halifax, CAN.
This case report discusses a unique presentation of an artery of Percheron (AOP) infarct resulting in rapidly resolving internuclear ophthalmoplegia (INO) without classical signs. This is the case of a 70-year-old male patient who presented to a community Emergency Department following acute code stroke activation. Physical exam and imaging studies including non-contrast CT, CT angiography, CT perfusion, and MRI were performed.
View Article and Find Full Text PDFCardiac tissue regeneration by microfluidic generated cardiac cell-laden calcium alginate microgels and mesenchymal stem cell extracted exosomes on myocardial infarction model.
Int J Biol Macromol
December 2024
Department of Tissue Engineering & Regenerative Medicine, School of Advanced Technologies in Medicine, Mazandaran University of Medical Sciences, Sari, Iran; Molecular and Cell Biology Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran; Immunogenetics Research Center, Mazandaran University of Medical Sciences, Sari, Iran. Electronic address:
Regenerative medicine is one of the effective approaches for myocardial infarcted (MI) tissue due to the low capacity of heart for regeneration. However, cell therapy with local administration has shown poor cell retention in the targeted area and limited engraftment capacity at the intended location, resulting in inadequate tissue regeneration. The present study involves mesenchymal stem cell-derived exosomes and encapsulated cells in small and injectable calcium alginate microgels by a specialized microfluidic device to decrease inflammation and increase cell retention in the infarcted tissue.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!