Several studies have suggested that Alzheimer's disease (AD), one of the most common forms of dementia, might be facilitated by anesthesia and surgery. Our recent research showed that the commonly used inhalational anesthetic isoflurane could induce caspase activation and apoptosis, which in turn increases generation of amyloid 2-protein (A2), the key component of senile plaques in AD patients. These findings could have potential clinical importance since increased A2 generation and apoptosis by anesthesia could conceivably serve to trigger or exacerbate the development of AD. However, the up-stream underlying mechanisms and the down-stream consequences of the isoflurane- induced apoptosis and A2 generation (apoptosis/A2 generation) remain largely unknown. Consistent with the notions that excessive calcium can trigger or contribute to apoptosis and isoflurane can affect synaptic function, our preliminary studies have shown that isoflurane can 1) induce apoptosis/A2 generation, 2) enhance cytosolic calcium levels, and 3) reduce surface NMDA receptors in cortical neurons of naove mice. Thus, our main hypothesis is that isoflurane enhances cytosolic calcium levels to induce apoptosis/A2 generation, leading to synaptic NMDA receptor endocytosis. We will employ chemical and genetic tools through both in vitro and in vivo approaches to accomplish three Specific Aims: 1) to characterize effects of isoflurane on apoptosis/A2 generation;2) to define whether the alterations in cytosolic calcium levels are associated with isoflurane-induced apoptosis/A2 generation;and 3) to determine the effects of isoflurane on synaptic NMDA receptor endocytosis. The proposed research aims to extend our recent findings that isoflurane induces apoptosis/A2 generation to further determine the underlying mechanisms and their effects on synaptic NMDA receptor endocytosis. The data generated in this project would provide novel information regarding the mechanisms of isoflurane- induced apoptosis/A2 generation and their contribution to the impairment of NMDA receptor-mediated synaptic function. The results of this study may ultimately guide researchers and clinicians to design safer anesthetics and to provide better anesthesia care for patients, particularly senior and AD patients.

Public Health Relevance

Our recent research showed that anesthetic isoflurane induces apoptosis and increases the generation of amyloid-2 protein (A2). In the proposed research we will further characterize these effects and determine their up-stream mechanisms and down-stream consequences.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Project (R01)
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Aging Systems and Geriatrics Study Section (ASG)
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Cole, Alison E
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Massachusetts General Hospital
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Miao, Huihui; Dong, Yuanlin; Zhang, Yiying et al. (2018) Anesthetic Isoflurane or Desflurane Plus Surgery Differently Affects Cognitive Function in Alzheimer's Disease Transgenic Mice. Mol Neurobiol 55:5623-5638
Zhang, Ce; Zhang, Yiying; Shen, Yuan et al. (2017) Anesthesia/Surgery Induces Cognitive Impairment in Female Alzheimer's Disease Transgenic Mice. J Alzheimers Dis 57:505-518
Ni, Cheng; Li, Cheng; Dong, Yuanlin et al. (2017) Anesthetic Isoflurane Induces DNA Damage Through Oxidative Stress and p53 Pathway. Mol Neurobiol 54:3591-3605
Lu, Han; Liufu, Ning; Dong, Yuanlin et al. (2017) Sevoflurane Acts on Ubiquitination-Proteasome Pathway to Reduce Postsynaptic Density 95 Protein Levels in Young Mice. Anesthesiology 127:961-975
Dong, Yuanlin; Xu, Zhipeng; Huang, Lining et al. (2016) Peripheral surgical wounding may induce cognitive impairment through interlukin-6-dependent mechanisms in aged mice. Med Gas Res 6:180-186
Liang, Feng; Zhang, Yiying; Hong, Wooyoung et al. (2016) Correction to Direct Tracking of Amyloid and Tau Dynamics in Neuroblastoma Cells Using Nanoplasmonic Fiber Tip Probes. Nano Lett 16:5967
Yuan, Jing; Cui, Guiyun; Li, Wenlu et al. (2016) Propofol Enhances Hemoglobin-Induced Cytotoxicity in Neurons. Anesth Analg 122:1024-30
Vutskits, Laszlo; Xie, Zhongcong (2016) Lasting impact of general anaesthesia on the brain: mechanisms and relevance. Nat Rev Neurosci 17:705-717
Liang, Feng; Zhang, Yiying; Hong, Wooyoung et al. (2016) Direct Tracking of Amyloid and Tu Dynamics in Neuroblastoma Cells Using Nanoplasmonic Fiber Tip Probes. Nano Lett 16:3989-94
Peng, Mian; Zhang, Ce; Dong, Yuanlin et al. (2016) Battery of behavioral tests in mice to study postoperative delirium. Sci Rep 6:29874

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