alexa Protective Effects of Acetyl L-Carnitine on Inhalation
ISSN: 2329-9053

Journal of Molecular Pharmaceutics & Organic Process Research
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Research Article

Protective Effects of Acetyl L-Carnitine on Inhalation Anesthetic-InducedNeuronal Damage in the Nonhuman Primate

Zhang X1, Liu S1, Paule MG1, Newport GD1, Callicott R1, Berridge MS2, Apana SM2, Slikker W Jr1 and Wang C1*
1National Center for Toxicological Research, U.S. Food and Drug AdministrationJefferson, Arkansas 72079, USA
23D Imaging, LLC, Little Rock, AR 72113 and University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
Corresponding Author : Cheng Wang
Division of Neurotoxicology
National Center for Toxicological Research/FDA
3900 NCTR Road, Jefferson
AR 72079-9502, USA
Tel: 870-543-7259
Fax: 870-543-7745
E-mail: [email protected]
Received January 18, 2013; Accepted February 26, 2013; Published February 28, 2013
Citation: Zhang X, Liu S, Paule MG, Newport GD, Callicott R, et al. (2013) Protective Effects of Acetyl L-Carnitine on Inhalation Anesthetic-Induced Neuronal Damage in the Nonhuman Primate. J Mol Pharm Org Process Res 1:102. doi: 10.4172/jmpopr.1000102
Copyright: © 2013 Zhang X, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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The inhalation anesthetics nitrous oxide (N2O) and isoflurane (ISO) are commonly used for general anesthesia in human infants. Combined exposures to N2O and ISO are known to cause abnormal apoptotic cell death (neurotoxicity) in pediatric animal models. Acetyl-L-carnitine (ALC), an anti-oxidant dietary supplement, has been reported to minimize neuronal damage in some models of neurotoxicity. MicroPET/CT imaging is capable of detecting and localizing changes in cellular markers of brain damage associated with developmental exposures to general anesthetics. By monitoring changes in glial activation, thought to be a marker of neuroinflammation, it should be possible to determine the intensity, duration and location of neuronal damage associated with exposure to general anesthetics. Here we assessed the uptake of 18F-labeled fluoroethoxybenzyl-N-(4-phenoxypyridin-3-yl) acetamide (FEPPA), a ligand for peripheral benzodiazepine receptors on activated glial cells. On postnatal day (PND) 5, rhesus monkeys (4/group) were exposed to a mixture of 70% N2O, 29% oxygen plus 1% ISO, or ALC (100 mg/kg given i.p.) plus this mixture for 8 hours; control monkeys with and without ALC were exposed to room air only. [18F]-FEPPA was injected intravenously and microPET/CT images were obtained one day and one and three weeks after anesthetic exposure. One day after anesthetic exposure the uptake of FEPPA was significantly increased only in the temporal lobe and one week after exposure uptake was significantly increased in only the frontal lobe. No significant differences in uptake were seen in any area after 3 weeks. Co-administration of ALC effectively blocked the increase in FEPPA uptake in both the temporal and frontal lobes. These findings suggest that microPET/CT imaging of FEPPA uptake may be useful for monitoring the time-course and location of adverse neural events that are associated with developmental exposures to general anesthetics. In addition, ALC appears to be capable of protecting against at least some of the adverse effects associated with such exposures.

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