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Volatile anesthetics rapidly increase dendritic spine density in the rat medial prefrontal cortex during synaptogenesis

Published in Anesthesiology. 2010, vol. 112, no. 3, p. 546-556
Abstract BACKGROUND: Recent experimental observations suggest that, in addition to induce neuroapoptosis, anesthetics can also interfere with synaptogenesis during brain development. The aim of this study was to pursue this issue by evaluating the exposure time-dependent effects of volatile anesthetics on neuronal cytoarchitecture in 16-day-old rats, a developmental stage characterized by intense synaptogenesis in the cerebral cortex. METHODS: Whistar rats underwent isoflurane (1.5%), sevoflurane (2.5%), or desflurane (7%) anesthesia for 30, 60, and 120 min at postnatal day 16, and the effect of these treatments on neuronal cytoarchitecture was evaluated 6 h after the initiation of anesthesia. Cell death was assessed using Fluoro-Jade B staining and terminal deoxynucleotidyl transferase deoxyuridine triphosphate nick-end labeling assay. Ionotophoretic injections into layer 5 pyramidal neurons in the medial prefrontal cortex allowed visualization of dendritic arbor. Tracing of dendritic tree was carried out using the Neurolucida station (Microbrightfield, Williston, VT), whereas dendritic spines were analyzed using confocal microscopy. RESULTS: Up to a 2-h-long exposure, none of the volatile drugs induced neuronal cell death or significant changes in gross dendritic arbor pattern of layer 5 pyramidal neurons in pups at postnatal day 16. In contrast, these drugs significantly increased dendritic spine density on dendritic shafts of these cells. Importantly, considerable differences were found between these three volatile agents in terms of exposure time-dependent effects on dendritic spine density. CONCLUSION: These new results suggest that volatile anesthetics, with different potencies and without inducing cell death, could rapidly interfere with physiologic patterns of synaptogenesis and thus might impair appropriate circuit assembly in the developing cerebral cortex.
Keywords Anesthetics, Inhalation/ pharmacologyAnimalsCell Death/drug effectsColoring AgentsDendritic Spines/ drug effectsImmunohistochemistryIn Situ Nick-End LabelingIontophoresisIsoflurane/analogs & derivatives/pharmacologyMethyl Ethers/pharmacologyOrganic ChemicalsPrefrontal Cortex/ cytology/drug effects/growth & developmentPyramidal Cells/drug effects/ultrastructureRatsRats, Long-EvansRats, WistarSynapses/ drug effects
PMID: 20124985
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Research groups Anesthésie et neurosciences (883)
Groupe Dayer Alexandre (Formation du circuit cortical) (875)
Plasticité des synapses excitatrices (76)
Progéniteurs neuronaux (141)
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BRINER, Adrian et al. Volatile anesthetics rapidly increase dendritic spine density in the rat medial prefrontal cortex during synaptogenesis. In: Anesthesiology, 2010, vol. 112, n° 3, p. 546-556. doi: 10.1097/ALN.0b013e3181cd7942 https://archive-ouverte.unige.ch/unige:10205

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Deposited on : 2010-08-06

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