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Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats

  • Authors:
    • Liangyuan Suo
    • Mingyu Wang
  • View Affiliations / Copyright

    Affiliations: Department of Anesthesiology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital, Shenyang, Liaoning 110042, P.R. China
    Copyright: © Suo et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 1038
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    Published online on: July 20, 2021
       https://doi.org/10.3892/etm.2021.10470
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Abstract

Postoperative cognitive dysfunction (POCD) is a common complication in the postoperative nervous system of elderly patients. Surgery‑induced hippocampal neuroinflammation is closely associated with POCD. Dexmedetomidine (DEX) is an effective α2‑adrenergic receptor agonist, which can reduce inflammation and has neuroprotective effects, thereby improving postoperative cognitive dysfunction. However, the mechanism by which DEX improves POCD is currently unclear. The purpose of the present study was therefore to identify how DEX acted on POCD. Male Sprague Dawley rats with exposed carotid arteries were used to mimic POCD. Locomotor activity was accessed by the open field test and the Morris water maze was performed to estimate spatial learning, memory and cognitive flexibility. Following animal sacrifice, the hippocampus was collected and cell apoptosis was determined by terminal dexynucleotidyl transferase (TdT)‑mediated dUTP nick end labeling staining. Subsequently, the expression of apoptosis‑related proteins Bax, Bcl‑2, cleaved caspase‑3 and cleaved caspase‑9 was determined by western blotting and the concentrations of TNF‑α, IL‑6, IL‑1β and IL‑10 were measured in serum using ELISA. Nitric oxide synthase and neuronal nitric oxide synthase activities in the hippocampus were also measured. The T lymphocyte subsets were analyzed by flow cytometry to evaluate the immune function in each group. Compared with the surgery group, DEX ameliorated POCD by improving cognitive dysfunctions and immune function loss, and attenuated neuroinflammation and neuronal apoptosis.
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Copy and paste a formatted citation
Spandidos Publications style
Suo L and Wang M: Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats. Exp Ther Med 22: 1038, 2021.
APA
Suo, L., & Wang, M. (2021). Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats. Experimental and Therapeutic Medicine, 22, 1038. https://doi.org/10.3892/etm.2021.10470
MLA
Suo, L., Wang, M."Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats". Experimental and Therapeutic Medicine 22.3 (2021): 1038.
Chicago
Suo, L., Wang, M."Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats". Experimental and Therapeutic Medicine 22, no. 3 (2021): 1038. https://doi.org/10.3892/etm.2021.10470
Copy and paste a formatted citation
x
Spandidos Publications style
Suo L and Wang M: Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats. Exp Ther Med 22: 1038, 2021.
APA
Suo, L., & Wang, M. (2021). Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats. Experimental and Therapeutic Medicine, 22, 1038. https://doi.org/10.3892/etm.2021.10470
MLA
Suo, L., Wang, M."Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats". Experimental and Therapeutic Medicine 22.3 (2021): 1038.
Chicago
Suo, L., Wang, M."Dexmedetomidine facilitates the expression of nNOS in the hippocampus to alleviate surgery‑induced neuroinflammation and cognitive dysfunction in aged rats". Experimental and Therapeutic Medicine 22, no. 3 (2021): 1038. https://doi.org/10.3892/etm.2021.10470
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