Cocaine increases intracellular calcium and reactive oxygen species, depolarizes mitochondria, and activates genes associated with heart failure and remodeling

To determine the cardiovascular molecular events associated with acute exposure to cocaine, the present study utilized in vivo analysis of left-ventricular heart function in adult rabbits, fluorescence confocal microscopy of fluo-2, rhod-2, (5-(and-6) carboxy 2',7' dichlorodihydrofluores-c...

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Veröffentlicht in:Cardiovascular toxicology 2005-01, Vol.5 (4), p.377-390
Hauptverfasser: Lattanzio, Jr, Frank A, Tiangco, David, Osgood, Christopher, Beebe, Stephen, Kerry, Julie, Hargrave, Barbara Y
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container_end_page 390
container_issue 4
container_start_page 377
container_title Cardiovascular toxicology
container_volume 5
creator Lattanzio, Jr, Frank A
Tiangco, David
Osgood, Christopher
Beebe, Stephen
Kerry, Julie
Hargrave, Barbara Y
description To determine the cardiovascular molecular events associated with acute exposure to cocaine, the present study utilized in vivo analysis of left-ventricular heart function in adult rabbits, fluorescence confocal microscopy of fluo-2, rhod-2, (5-(and-6) carboxy 2',7' dichlorodihydrofluores-cein diacetate (carboxy-H2DCFDA), and JC-1 in H9C2 cells and gene expression microarray technology for analysis of gene activation in both rabbit ventricular tissue and H9C2 cells. In the rabbit, acute cocaine exposure (2 mg/kg) caused left-ventricular dysfunction and 0.1-10 mM cocaine increased cytosolic and mitochondrial calcium activity and mitochondrial membrane depolarization in H9C2 cells. A 3-min pretreatment of H9C2 cells by 10 microM verapamil, nifedipine, or nadolol inhibited calcium increases, but only 1 mM N-acetylcysteine (NAC) or 1 mM glutathione blocked mitochondrial membrane depolarization. Cocaine induced activation of genes in the rabbit heart and H9C2 cells including angiotensinogen, ADRB1, and c-reactive protein (CRP). In H9C2 cells, NAC pretreatment blocked cocaine-mediated increases in CRP, FAS, FAS ligand, and cytokine receptor-like factor1 (CRLF1) expression. Collectively, these data suggest that acute cocaine administration initiates cellular and genetic changes that, if chronically manifested, could cause cardiac deficits similar to those seen in heart failure and ischemia, such as ventricular dysfunction, cardiac arrhythmias, and cardiac remodeling.
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subjects Acetylcysteine - pharmacology
Animals
Calcium - metabolism
Calcium Channel Blockers - pharmacology
Cells
Cocaine
Cocaine - toxicity
Dose-Response Relationship, Drug
Female
Gene expression
Gene Expression Regulation - drug effects
Glutathione - pharmacology
Heart failure
Heart Failure - genetics
Intracellular Membranes - drug effects
Intracellular Membranes - physiology
Membrane Potentials - drug effects
Membrane Potentials - physiology
Microscopy, Confocal
Mitochondria - drug effects
Myocytes, Cardiac - drug effects
Myocytes, Cardiac - metabolism
Narcotics - toxicity
Oligonucleotide Array Sequence Analysis
Rabbits
Reactive Oxygen Species - antagonists & inhibitors
Reactive Oxygen Species - metabolism
Transcriptional Activation
Ventricular Function, Left - drug effects
Ventricular Function, Left - genetics
Ventricular Remodeling - genetics
title Cocaine increases intracellular calcium and reactive oxygen species, depolarizes mitochondria, and activates genes associated with heart failure and remodeling
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