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The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats
BACKGROUND: The study sought to investigate the effects of dexmedetomidine (DEX) on cognitive function after anesthesia and to examine its actual mechanism. METHODS: A total of 48 rats were injected with d-galactose (D-gal) 1,000 mg·kg(−1)·d(−1) and normal saline at the neck and back for 1 week to e...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
AME Publishing Company
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9279787/ https://www.ncbi.nlm.nih.gov/pubmed/35845519 http://dx.doi.org/10.21037/atm-22-2043 |
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author | Zhou, Qian Xie, Dongjin Chen, Ting Gao, Youguang Lin, Lanying Lin, Xianzhong |
author_facet | Zhou, Qian Xie, Dongjin Chen, Ting Gao, Youguang Lin, Lanying Lin, Xianzhong |
author_sort | Zhou, Qian |
collection | PubMed |
description | BACKGROUND: The study sought to investigate the effects of dexmedetomidine (DEX) on cognitive function after anesthesia and to examine its actual mechanism. METHODS: A total of 48 rats were injected with d-galactose (D-gal) 1,000 mg·kg(−1)·d(−1) and normal saline at the neck and back for 1 week to establish rats with mild cognitive impairment (MCI) and conduct behavioral tests. Sevoflurane was inhaled and DEX was pumped into each group respectively. Morris water maze (MWM) test was conducted 24 hours later. The inflammatory factors interleukin (IL)-1, interleukin (IL)-6, and a tumor necrosis factor (TNF)-α in brain homogenate were quantitatively measured by enzyme-linked immunosorbent assay (ELISA) on the next day. The apoptosis of hippocampal cells was observed by hematoxylin-eosin staining (HE staining). RESULTS: In relation to the model establishment, we found that there was no significant difference in body weight and swimming speed before and after modeling. There was no statistically significant difference in the escape latency between Groups A, B, C, and D before modeling. After modeling, there was no statistical difference in the escape latency between Groups A, B, and C, but the difference was statistically significant when compared to Group D (P<0.05). In relation to the DEX intervention, we found that compared to Group C, MWM test performance in Groups A and B was considerably worse longer escape latencies and fewer platform crossings within 90 seconds), and were more significant in Group A. Compared with Group D, the levels of inflammatory cytokines of the brain homogenates were elevated, and this elevation was highest in Group A, followed by Group B; the pathological changes were consistent with changes in behavioral tests. In Group A, there were obvious disorders of glial cell arrangement, apoptosis and deletion. There was no significant change in Group D. And the changes of vertebral cells in Group B and Group C were slight, with orderly arrangement and intact cell structure. CONCLUSIONS: DEX inhibits the apoptosis of hippocampal cells and reduces the cognitive dysfunction of rats with MCI induced by D-gal via the inhibition of the release of inflammatory cytokines. |
format | Online Article Text |
id | pubmed-9279787 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | AME Publishing Company |
record_format | MEDLINE/PubMed |
spelling | pubmed-92797872022-07-15 The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats Zhou, Qian Xie, Dongjin Chen, Ting Gao, Youguang Lin, Lanying Lin, Xianzhong Ann Transl Med Original Article BACKGROUND: The study sought to investigate the effects of dexmedetomidine (DEX) on cognitive function after anesthesia and to examine its actual mechanism. METHODS: A total of 48 rats were injected with d-galactose (D-gal) 1,000 mg·kg(−1)·d(−1) and normal saline at the neck and back for 1 week to establish rats with mild cognitive impairment (MCI) and conduct behavioral tests. Sevoflurane was inhaled and DEX was pumped into each group respectively. Morris water maze (MWM) test was conducted 24 hours later. The inflammatory factors interleukin (IL)-1, interleukin (IL)-6, and a tumor necrosis factor (TNF)-α in brain homogenate were quantitatively measured by enzyme-linked immunosorbent assay (ELISA) on the next day. The apoptosis of hippocampal cells was observed by hematoxylin-eosin staining (HE staining). RESULTS: In relation to the model establishment, we found that there was no significant difference in body weight and swimming speed before and after modeling. There was no statistically significant difference in the escape latency between Groups A, B, C, and D before modeling. After modeling, there was no statistical difference in the escape latency between Groups A, B, and C, but the difference was statistically significant when compared to Group D (P<0.05). In relation to the DEX intervention, we found that compared to Group C, MWM test performance in Groups A and B was considerably worse longer escape latencies and fewer platform crossings within 90 seconds), and were more significant in Group A. Compared with Group D, the levels of inflammatory cytokines of the brain homogenates were elevated, and this elevation was highest in Group A, followed by Group B; the pathological changes were consistent with changes in behavioral tests. In Group A, there were obvious disorders of glial cell arrangement, apoptosis and deletion. There was no significant change in Group D. And the changes of vertebral cells in Group B and Group C were slight, with orderly arrangement and intact cell structure. CONCLUSIONS: DEX inhibits the apoptosis of hippocampal cells and reduces the cognitive dysfunction of rats with MCI induced by D-gal via the inhibition of the release of inflammatory cytokines. AME Publishing Company 2022-06 /pmc/articles/PMC9279787/ /pubmed/35845519 http://dx.doi.org/10.21037/atm-22-2043 Text en 2022 Annals of Translational Medicine. All rights reserved. https://creativecommons.org/licenses/by-nc-nd/4.0/Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0 (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Original Article Zhou, Qian Xie, Dongjin Chen, Ting Gao, Youguang Lin, Lanying Lin, Xianzhong The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats |
title | The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats |
title_full | The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats |
title_fullStr | The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats |
title_full_unstemmed | The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats |
title_short | The effects of dexmedetomidine on the cognitive function of mild cognitive impairment (MCI) rats |
title_sort | effects of dexmedetomidine on the cognitive function of mild cognitive impairment (mci) rats |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9279787/ https://www.ncbi.nlm.nih.gov/pubmed/35845519 http://dx.doi.org/10.21037/atm-22-2043 |
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