Isoflurane exposure for three hours triggers apoptotic cell death in neonatal macaque brain

K. K. Noguchi, S. A. Johnson, Gregory Dissen, Lauren Drew Martin, F. M. Manzella, K. J. Schenning, J. W. Olney, Ansgar Brambrink

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    Abstract

    Background: Retrospective clinical studies suggest there is a risk for neurodevelopmental impairment following early childhood exposure to anaesthesia. In the developing animal brain, including those of non-human primates (NHPs), anaesthetics induce apoptotic cell death. We previously reported that a 5 h isoflurane (ISO) exposure in infant NHPs increases apoptosis 13-fold compared with control animals. However, the majority of paediatric surgeries requiring anaesthesia are of shorter durations. We examined whether 3 h ISO exposure similarly increases neuroapoptosis in the NHP developing brain. Methods: Six-day-old NHP infants (Macaca mulatta) were exposed to 3 h of a surgical plane of ISO (n=6) or to room air (n=5). Following exposure, NHP brains were screened for neuronal and oligodendrocyte apoptosis using activated caspase-3 immunolabelling and unbiased stereology. Results: ISO treatment increased apoptosis (neurones + oligodendrocyte) to greater than four times that in the control group [mean density of apoptotic profiles: 57 (SD 22) mm â '3 vs 14 (SD 5.2) mm â '3, respectively]. Oligodendrocyte apoptosis was evenly distributed throughout the white matter whereas neuroapoptosis occurred primarily in the cortex (all regions), caudate, putamen and thalamus. Conclusions: A 3 h exposure to ISO is sufficient to induce widespread neurotoxicity in the developing primate brain. These results are relevant for clinical medicine, as many surgical and diagnostic procedures in children require anaesthesia durations similar to those modelled here. Further research is necessary to identify long-term neurobehavioural consequences of 3 h ISO exposure.

    Original languageEnglish (US)
    Pages (from-to)524-531
    Number of pages8
    JournalBritish Journal of Anaesthesia
    Volume119
    Issue number3
    DOIs
    StatePublished - 2017

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    Keywords

    • anaesthesia
    • apoptosis
    • growth and development
    • isoflurane

    ASJC Scopus subject areas

    • Anesthesiology and Pain Medicine

    Cite this

    Noguchi, K. K., Johnson, S. A., Dissen, G., Martin, L. D., Manzella, F. M., Schenning, K. J., Olney, J. W., & Brambrink, A. (2017). Isoflurane exposure for three hours triggers apoptotic cell death in neonatal macaque brain. British Journal of Anaesthesia, 119(3), 524-531. https://doi.org/10.1093/bja/aex123