Article(id=1322954139981979727, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322954116858782668, articleNumber=null, orderNo=null, doi=10.16016/j.2097-0927.202509053, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1757865600000, receivedDateStr=2025-09-15, revisedDate=1764691200000, revisedDateStr=2025-12-03, acceptedDate=null, acceptedDateStr=null, onlineDate=1793346446271, onlineDateStr=2026-10-30, pubDate=1767024000000, pubDateStr=2025-12-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793346446271, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793346446271, creator=13701087609, updateTime=1793346446271, updator=13701087609, issue=Issue{id=1322954116858782668, tenantId=1146029695717560320, journalId=1319373162502258839, year='2025', volume='47', issue='24', pageStart='3009', pageEnd='3159', issueExtLink='null', onlineDate='null', pubDate='1767024000000', pubDateStr='2025-12-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793346440757, creator='13701087609', updateTime=1793346440757, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=3077, endPage=3088, ext={EN=ArticleExt(id=1322954140183306320, articleId=1322954139981979727, tenantId=1146029695717560320, journalId=1319373162502258839, language=EN, title=Dexmedetomidine alleviates sevoflurane-induced cognitive dysfunction in neonatal rats by inhibiting the mTOR/NF-κB signaling pathway, columnId=1320435149808980440, journalTitle=Journal of Army Medical University, columnName=Neuroscience, runingTitle=null, highlight=null, articleAbstract=
Objective To explore whether dexmedetomidine (Dex) improves sevoflurane (Sev)-induced cognitive impairment in neonatal rats by regulating mammalian rapamycin target protein (mTOR)/nuclear factor-κB (NF-κB) signaling pathway.
Methods Fifty neonatal SD rats (aged 6 d, weighing 9.5~11.5 g) were randomly divided into 5 groups: sham operation (Sham) group, model (Model) group, low-dose Dex (Dex-L) group, high-dose Dex (Dex-H) group, and phorbol 12-myristate 13-acetate (PMA) group (an activator of mTOR/NF-κB signaling pathway), with 10 animals in each group. The rats in the Sham group were placed in a sealed chamber containing fresh air, while those rats from the other 4 groups were exposed to 2% Sev+21% O₂ for modeling. In 2 h before chamber placement, the Dex-L and Dex-H groups received an intraperitoneal injection of 10 and 30 μg/kg Dex, respectively, and the PMA group received an intraperitoneal injection of 30 μg/kg Dex and 5 mg/kg PMA. The rats in the Sham and Model groups were given an intraperitoneal injection of equivalent volume of normal saline. Cognitive function and learning and memory abilities were evaluated with novel object recognition test and step-down inhibitory avoidance test. Laser speckle contrast imaging (LSCI) was used to observe cerebral blood flow; Nissl staining and transmission electron microscopy were employed to observe the ultrastructure of hippocampal neurons and synapses. TUNEL staining was perform to detect the cell apoptosis. Quantitative real-time polymerase chain reaction (qRT-PCR) was applied to measure the expression levels of mTOR, NF-κB, postsynaptic density protein 95 (PSD95), synaptophysin (SYP), synapsin (SYP), microtubule-associated protein-2 (Map-2), B-cell lymphoma-2 (Bcl-2), and Bcl-2-associated X protein (Bax) in the hippocampal tissue. Western blotting was conducted to detect the protein levels of mTOR, p-mTOR, NF-κB, p-NF-κB, Bcl-2, and Bax in the hippocampal tissue.
Results Compared with the Sham group, the Model group exhibited significantly lower discrimination index and shorter platform jumping latency, increased number of errors (P<0.05), reduced cerebral blood perfusion, decreased number of hippocampal neurons, damaged synaptic structure, raised apoptotic rate, enhanced expression of p-mTOR, p-NF-κB and Bax at mRNA and protein levels (P<0.05), while down-regulated mRNA levels of SYN, Map-2, SYP and PSD95 (P<0.05), and reduced mRNA and protein expression of Bcl-2 (P<0.05). After the intervention of Dex, all the above indexes were significantly improved (P<0.05), and the effects of high dose were better. PMA partially reversed the protective effects of Dex-H, reactivated the signal of mTOR/NF-κB, and aggravated the neuronal damage (P<0.05).
Conclusion Dex may alleviate cognitive dysfunction in neonatal rats by inhibiting the mTOR/NF-κB signaling pathway and suppressing Sev-induced hippocampal neuronal apoptosis.
, authors=Ying CHEN, Mei YANG, Yishan YANG, Hong WANG, Liwen REN, Xu HAN, Songjiang TANG, authorsList=Ying CHEN, Mei YANG, Yishan YANG, Hong WANG, Liwen REN, Xu HAN, Songjiang TANG, authorCompany=null, correspAuthors=Songjiang TANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=© 2025 Journal of Army Medical University, copyrightOwner=Editorial Office of Journal of Army Medical University, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322954143815573605, articleId=1322954139981979727, tenantId=1146029695717560320, journalId=1319373162502258839, language=CN, title=右美托咪定通过抑制mTOR/NF-κB信号通路减轻七氟烷诱导的新生大鼠认知功能障碍, columnId=1320435149964169690, journalTitle=陆军军医大学学报, columnName=论著·神经科学, runingTitle=null, highlight=null, articleAbstract=
目的 探讨右美托咪定(dexmedetomidine,Dex)是否通过调控哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)/核转录因子-κB(nuclear factor kappaB,NF-κB)信号通路,改善七氟烷(sevoflurane,Sev)诱导的新生大鼠认知障碍。
方法 将50只6日龄SD大鼠,体质量(9.5~11.5)g,按照随机数字表法分为(n=10):假手术(Sham)组、模型(Model)组、Dex低剂量(Dex-L)组、Dex高剂量(Dex-H)组及mTOR/NF-κB信号通路激活剂佛波酯(phorbol12-myristate13-acetate,PMA)组;其中,Model、Dex-L、Dex-H、PMA组大鼠以在封闭箱内通入2%Sev+21%O2进行造模,Sham组给予新鲜空气;在放入箱内前2 h,Dex-L、Dex-H组大鼠分别腹腔注射10 μg/kg和30 μg/kg的Dex,PMA组大鼠腹腔注射30 μg/kg的Dex和5 mg/kg的PMA;Sham组和Model组大鼠腹腔注射等浓度的生理盐水。通过新物体识别实验和跳台试验评估认知功能、学习和记忆功能;激光散斑成像检测脑血流灌注;尼氏染色和透射电镜观察海马神经元及突触超微结构损伤;TUNEL试剂盒染色检测细胞凋亡;实时荧光定量聚合酶链式反应(quantitative real-time polymerase chain reaction,qRT-PCR)检测大鼠脑组织海马区mTOR、NF-κB、突触后致密物蛋白(postsynaptic density protein,PSD)95和突触生长素(synaptophysin,SYP)、突触素(synapsin,SYN)、突触蛋白微管相关蛋白-2(microtubule associated protein-2,Map-2)、B淋巴细胞瘤-2(B cell lymphoma-2,Bcl-2)和Bcl-2相关X蛋白(Bcl2-associated x protein,Bax)的mRNA的表达;Western blot法检测大鼠海马组织中mTOR、磷酸化mTOR(phospho-mTOR,p-mTOR)、NF-κB、磷酸化NF-κB(phospho-NF-κB,p-NF-κB)、Bcl-2和Bax的表达。
结果 与Sham组相比,Model组大鼠辨别指数和跳台潜伏期显著降低,错误次数增加(P<0.05),脑血流灌注减少,海马神经元数量减少,突触结构损伤,凋亡率升高,p-mTOR、p-NF-κB、Bax的mRNA和蛋白的表达上调,而SYN、Map-2、SYP、PSD95的mRNA的表达下调(P<0.05),Bcl-2的mRNA和蛋白的表达下调(P<0.05)。Dex干预后,上述指标均显著改善(P<0.05),且高剂量效果更优。PMA可部分逆转Dex-H的保护作用,重新激活mTOR/NF-κB信号,加重神经元损伤(P<0.05)。
结论 Dex可能通过抑制mTOR/NF-κB信号通路,抑制Sev诱导的海马神经元凋亡,从而缓解新生大鼠的认知功能障碍。
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2025,
62(6):8013-8037., articleTitle=Activation of NR2A-wnt-TLR2 signaling axis in satellite glial cells of the dorsal root ganglion contributes to neuropathic pain induced by nerve injury in diabetic mice, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1322954144042066022, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, xref=1, ext=[AuthorCompanyExt(id=1322954144050454631, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, companyId=1322954144042066022, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1Department of Anesthesiology,the First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine,Guiyang,Guizhou,China), AuthorCompanyExt(id=1322954144063037544, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, companyId=1322954144042066022, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1贵州中医药大学第一附属医院麻醉科,贵州 贵阳)])], figs=[ArticleFig(id=1322954148471251094, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 1, caption=
Changes in cognitive,learning,and memory functions of rats in each group (n=10, ±s), figureFileSmall=BjSxwrJ/dws6c8uinWbNkw==, figureFileBig=TWZn1AaqPwXPFDVH1uHCRQ==, tableContent=null), ArticleFig(id=1322954148534165655, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图1, caption=
各组大鼠的认知、学习和记忆功能的变化 (n=10, ±s)a:P<0.05,compared with the Sham group; b:P<0.05,compared with the Model group; c:P<0.05,compared with the Dex-L group; d:P<0.05,compared with the Dex-H group
, figureFileSmall=BjSxwrJ/dws6c8uinWbNkw==, figureFileBig=TWZn1AaqPwXPFDVH1uHCRQ==, tableContent=null), ArticleFig(id=1322954148739686552, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 2, caption=
Cerebral blood perfusion of rats in each group, figureFileSmall=LrgXu2YICwe3cwFtjrj4tQ==, figureFileBig=RnOQ6LthGbHHKvayNBnr4A==, tableContent=null), ArticleFig(id=1322954148819378329, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图2, caption=
各组大鼠脑组织的血流灌注量, figureFileSmall=LrgXu2YICwe3cwFtjrj4tQ==, figureFileBig=RnOQ6LthGbHHKvayNBnr4A==, tableContent=null), ArticleFig(id=1322954148911653018, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 3, caption=
Nissl staining showing neuron activity in the hippocampus of rat brain tissue in each group (n=10, ±s), figureFileSmall=4zgoRAg+pC5SxVBRkRkUzA==, figureFileBig=IAmLpuHS4eog6PatePVqxA==, tableContent=null), ArticleFig(id=1322954148995539099, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图3, caption=
尼氏染色检测各组大鼠脑组织海马区神经元活性 (n=10, ±s)a:P<0.05,compared with the Sham group; b:P<0.05,compared with the Model group; c:P<0.05,compared with the Dex-L group; d:P<0.05,compared with the Dex-H group
, figureFileSmall=4zgoRAg+pC5SxVBRkRkUzA==, figureFileBig=IAmLpuHS4eog6PatePVqxA==, tableContent=null), ArticleFig(id=1322954149071036572, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 4, caption=
Ultrastructural damage of hippocampal synapses of rat brain tissue (n=10, ±s), figureFileSmall=giU8AJlX2aRp8Y8F22JKOw==, figureFileBig=g/LrkjKc/72ZeDbiaKspDw==, tableContent=null), ArticleFig(id=1322954149142339741, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图4, caption=
各组大鼠脑组织海马区的突触超微损伤 (n=10, ±s)a:P<0.05,compared with the Sham group; b:P<0.05,compared with the Model group; c:P<0.05,compared with the Dex-L group; d:P<0.05,compared with the Dex-H group
, figureFileSmall=giU8AJlX2aRp8Y8F22JKOw==, figureFileBig=g/LrkjKc/72ZeDbiaKspDw==, tableContent=null), ArticleFig(id=1322954149222031518, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 5, caption=
TUNEL staining displaying hippocampal apoptosis of rat brain tissue in each group, figureFileSmall=obmknp/SsL6Nbr0v7V3DTg==, figureFileBig=7b7VTBYoXRdGiHhFn6hYyQ==, tableContent=null), ArticleFig(id=1322954149301723295, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图5, caption=
TUNEL染色检测各组大鼠脑海马组织的细胞凋亡, figureFileSmall=obmknp/SsL6Nbr0v7V3DTg==, figureFileBig=7b7VTBYoXRdGiHhFn6hYyQ==, tableContent=null), ArticleFig(id=1322954149377220768, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 6, caption=
Expression of related genes in the hippocampus of rat brain tissue (n=10, ±s), figureFileSmall=DEXYcxjJlRJNAOYzM5kFZg==, figureFileBig=WF+u5yJo6kB73DGJj+8FyQ==, tableContent=null), ArticleFig(id=1322954149452718241, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图6, caption=
各组大鼠海马组织中相关基因的表达 (n=10, ±s)a:P<0.05,compared with the Sham group; b:P<0.05,compared with the Model group; c:P<0.05,compared with the Dex-L group; d:P<0.05,compared with the Dex-H group
, figureFileSmall=DEXYcxjJlRJNAOYzM5kFZg==, figureFileBig=WF+u5yJo6kB73DGJj+8FyQ==, tableContent=null), ArticleFig(id=1322954149524021410, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 7, caption=
Immunohistochemical assay showing the expression of SYN and Map-2 in the hippocampus of rat brain tissue in each group (n=10), figureFileSmall=wC+6p7qpi2zC2h3k6xFHbA==, figureFileBig=4rGlS61VZVCkzcE65abHaA==, tableContent=null), ArticleFig(id=1322954149603713187, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图7, caption=
免疫组化检测各组大鼠海马组织中的SYN和Map-2的表达 (n=10), figureFileSmall=wC+6p7qpi2zC2h3k6xFHbA==, figureFileBig=4rGlS61VZVCkzcE65abHaA==, tableContent=null), ArticleFig(id=1322954149675016356, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 8, caption=
Immunofluorescence staining showing SYP and PSD95 expression in the hippocampus of rat brain tissue (n=10), figureFileSmall=Z4As5bSMyEDT//xVxHZ+Qg==, figureFileBig=mENHduzQAe/RQ04fLif5HA==, tableContent=null), ArticleFig(id=1322954149821816997, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图8, caption=
免疫荧光染色检测各组大鼠海马组织中SYP和PSD95的表达 (n=10), figureFileSmall=Z4As5bSMyEDT//xVxHZ+Qg==, figureFileBig=mENHduzQAe/RQ04fLif5HA==, tableContent=null), ArticleFig(id=1322954149926674598, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 9, caption=
Expression of p-mTOR/mTOR,p-NF-κB/NF-κB,Bcl-2 and Bax in the hippocampus tissue in each group (n=10, ±s), figureFileSmall=3DGOBJnF4M7TmmiSmjBMAA==, figureFileBig=5O8Q+jsmbhmlU3/wHlT3Vw==, tableContent=null), ArticleFig(id=1322954149993783463, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图9, caption=
各组大鼠海马组织中p-mTOR/mTOR、p-NF-κB/NF-κB、Bcl-2和Bax的表达 (n=10, ±s)a:P<0.05,compared with the Sham group; b:P<0.05,compared with the Model group; c:P<0.05,compared with the Dex-L group; d:P<0.05,compared with the Dex-H group
, figureFileSmall=3DGOBJnF4M7TmmiSmjBMAA==, figureFileBig=5O8Q+jsmbhmlU3/wHlT3Vw==, tableContent=null), ArticleFig(id=1322954150077669544, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Figure 10, caption=
Schematic diagram of mechanism of dexmedetom-idine (Dex) effect on sevoflurane (Sev)-induced cognitive dysfunction and synaptic remodeling in neonatal rats, figureFileSmall=Y1+uevd9Fvs4Y4t50Ek8nQ==, figureFileBig=RCU22TZj1s1Z+NP9C16yBg==, tableContent=null), ArticleFig(id=1322954150148972713, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=图10, caption=
Dex对Sev预诱导的新生大鼠认知功能障碍及神经突触重塑的影响机制, figureFileSmall=Y1+uevd9Fvs4Y4t50Ek8nQ==, figureFileBig=RCU22TZj1s1Z+NP9C16yBg==, tableContent=null), ArticleFig(id=1322954150312550570, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=EN, label=Table 1, caption=
Primer sequences for qRT-PCR
, figureFileSmall=null, figureFileBig=null, tableContent=
| Gene | Primer sequence(5'→3') |
|---|
| mTOR | Forward:ATCAACTCCACGCGCTACAA |
| Reverse:GGCAGAAGCCGATGGTATGA |
| NF-κB | Forward:TGAGAACTGTCCTTACGTGACC |
| Reverse:AGAGCACCAAGACTGGCTCT |
| SYP | Forward:CGCGCTAGCTTATCAGACTGA |
| Reverse:CGGCCCAGTGTTCAGACTAC |
| PSD95 | Forward:CTCGCTTCGGCAGCACA |
| Reverse:AACGCTTCACGAATTTGCGT |
| SYN | Forward:CCAAAATTGGGTCCAGTGGTTT |
| Reverse:GACAAGGGCTCCACACAAGA-3' |
| Map-2 | Forward:AGAAAATGGGGTGGAAGCAGA-3' |
| Reverse:CAGGCACCTTGGTCATTCCT |
| Bcl-2 | Forward:CGTGCTCTCAGCCAACCA |
| Reverse:TGCCAACTGCTCGGATTTCT |
| Bax | Forward:AAAAACGCAATGTCCCTGCT |
| Reverse:CTTCTGTGGTAACGGGGTCC |
| GAPDH | Forward:TTGGTATCGTGGAAGGACTCA |
| Reverse:TGTCATCATATTTGGCAGGTT |
), ArticleFig(id=1322954150396436651, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322954139981979727, language=CN, label=表1, caption=
各基因的引物序列
, figureFileSmall=null, figureFileBig=null, tableContent=
| Gene | Primer sequence(5'→3') |
|---|
| mTOR | Forward:ATCAACTCCACGCGCTACAA |
| Reverse:GGCAGAAGCCGATGGTATGA |
| NF-κB | Forward:TGAGAACTGTCCTTACGTGACC |
| Reverse:AGAGCACCAAGACTGGCTCT |
| SYP | Forward:CGCGCTAGCTTATCAGACTGA |
| Reverse:CGGCCCAGTGTTCAGACTAC |
| PSD95 | Forward:CTCGCTTCGGCAGCACA |
| Reverse:AACGCTTCACGAATTTGCGT |
| SYN | Forward:CCAAAATTGGGTCCAGTGGTTT |
| Reverse:GACAAGGGCTCCACACAAGA-3' |
| Map-2 | Forward:AGAAAATGGGGTGGAAGCAGA-3' |
| Reverse:CAGGCACCTTGGTCATTCCT |
| Bcl-2 | Forward:CGTGCTCTCAGCCAACCA |
| Reverse:TGCCAACTGCTCGGATTTCT |
| Bax | Forward:AAAAACGCAATGTCCCTGCT |
| Reverse:CTTCTGTGGTAACGGGGTCC |
| GAPDH | Forward:TTGGTATCGTGGAAGGACTCA |
| Reverse:TGTCATCATATTTGGCAGGTT |
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